1 | # Copyright (c) 2010 WorkWare Systems http://www.workware.net.au/ |
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2 | # All rights reserved |
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3 | |
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4 | # @synopsis: |
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5 | # |
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6 | # The 'cc' module supports checking various 'features' of the C or C++ |
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7 | # compiler/linker environment. Common commands are 'cc-check-includes', |
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8 | # 'cc-check-types', 'cc-check-functions', 'cc-with', 'make-config-header' and 'make-template'. |
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9 | # |
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10 | # The following environment variables are used if set: |
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11 | # |
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12 | ## CC - C compiler |
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13 | ## CXX - C++ compiler |
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14 | ## CCACHE - Set to "none" to disable automatic use of ccache |
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15 | ## CFLAGS - Additional C compiler flags |
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16 | ## CXXFLAGS - Additional C++ compiler flags |
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17 | ## LDFLAGS - Additional compiler flags during linking |
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18 | ## LIBS - Additional libraries to use (for all tests) |
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19 | ## CROSS - Tool prefix for cross compilation |
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20 | # |
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21 | # The following variables are defined from the corresponding |
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22 | # environment variables if set. |
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23 | # |
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24 | ## CPPFLAGS |
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25 | ## LINKFLAGS |
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26 | ## CC_FOR_BUILD |
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27 | ## LD |
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28 | |
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29 | use system |
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30 | |
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31 | module-options {} |
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32 | |
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33 | # Checks for the existence of the given function by linking |
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34 | # |
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35 | proc cctest_function {function} { |
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36 | cctest -link 1 -declare "extern void $function\(void);" -code "$function\();" |
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37 | } |
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38 | |
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39 | # Checks for the existence of the given type by compiling |
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40 | proc cctest_type {type} { |
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41 | cctest -code "$type _x;" |
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42 | } |
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43 | |
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44 | # Checks for the existence of the given type/structure member. |
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45 | # e.g. "struct stat.st_mtime" |
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46 | proc cctest_member {struct_member} { |
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47 | # split at the first dot |
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48 | regexp {^([^.]+)[.](.*)$} $struct_member -> struct member |
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49 | cctest -code "static $struct _s; return sizeof(_s.$member);" |
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50 | } |
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51 | |
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52 | # Checks for the existence of the given define by compiling |
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53 | # |
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54 | proc cctest_define {name} { |
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55 | cctest -code "#ifndef $name\n#error not defined\n#endif" |
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56 | } |
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57 | |
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58 | # Checks for the existence of the given name either as |
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59 | # a macro (#define) or an rvalue (such as an enum) |
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60 | # |
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61 | proc cctest_decl {name} { |
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62 | cctest -code "#ifndef $name\n(void)$name;\n#endif" |
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63 | } |
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64 | |
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65 | # @cc-check-sizeof type ... |
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66 | # |
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67 | # Checks the size of the given types (between 1 and 32, inclusive). |
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68 | # Defines a variable with the size determined, or 'unknown' otherwise. |
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69 | # e.g. for type 'long long', defines 'SIZEOF_LONG_LONG'. |
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70 | # Returns the size of the last type. |
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71 | # |
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72 | proc cc-check-sizeof {args} { |
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73 | foreach type $args { |
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74 | msg-checking "Checking for sizeof $type..." |
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75 | set size unknown |
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76 | # Try the most common sizes first |
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77 | foreach i {4 8 1 2 16 32} { |
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78 | if {[cctest -code "static int _x\[sizeof($type) == $i ? 1 : -1\] = { 1 };"]} { |
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79 | set size $i |
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80 | break |
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81 | } |
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82 | } |
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83 | msg-result $size |
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84 | set define [feature-define-name $type SIZEOF_] |
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85 | define $define $size |
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86 | } |
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87 | # Return the last result |
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88 | get-define $define |
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89 | } |
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90 | |
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91 | # Checks for each feature in $list by using the given script. |
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92 | # |
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93 | # When the script is evaluated, $each is set to the feature |
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94 | # being checked, and $extra is set to any additional cctest args. |
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95 | # |
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96 | # Returns 1 if all features were found, or 0 otherwise. |
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97 | proc cc-check-some-feature {list script} { |
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98 | set ret 1 |
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99 | foreach each $list { |
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100 | if {![check-feature $each $script]} { |
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101 | set ret 0 |
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102 | } |
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103 | } |
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104 | return $ret |
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105 | } |
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106 | |
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107 | # @cc-check-includes includes ... |
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108 | # |
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109 | # Checks that the given include files can be used. |
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110 | proc cc-check-includes {args} { |
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111 | cc-check-some-feature $args { |
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112 | set with {} |
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113 | if {[dict exists $::autosetup(cc-include-deps) $each]} { |
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114 | set deps [dict keys [dict get $::autosetup(cc-include-deps) $each]] |
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115 | msg-quiet cc-check-includes {*}$deps |
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116 | foreach i $deps { |
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117 | if {[have-feature $i]} { |
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118 | lappend with $i |
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119 | } |
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120 | } |
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121 | } |
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122 | if {[llength $with]} { |
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123 | cc-with [list -includes $with] { |
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124 | cctest -includes $each |
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125 | } |
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126 | } else { |
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127 | cctest -includes $each |
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128 | } |
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129 | } |
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130 | } |
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131 | |
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132 | # @cc-include-needs include required ... |
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133 | # |
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134 | # Ensures that when checking for '$include', a check is first |
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135 | # made for each '$required' file, and if found, it is included with '#include'. |
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136 | proc cc-include-needs {file args} { |
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137 | foreach depfile $args { |
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138 | dict set ::autosetup(cc-include-deps) $file $depfile 1 |
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139 | } |
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140 | } |
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141 | |
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142 | # @cc-check-types type ... |
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143 | # |
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144 | # Checks that the types exist. |
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145 | proc cc-check-types {args} { |
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146 | cc-check-some-feature $args { |
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147 | cctest_type $each |
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148 | } |
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149 | } |
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150 | |
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151 | # @cc-check-defines define ... |
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152 | # |
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153 | # Checks that the given preprocessor symbols are defined. |
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154 | proc cc-check-defines {args} { |
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155 | cc-check-some-feature $args { |
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156 | cctest_define $each |
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157 | } |
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158 | } |
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159 | |
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160 | # @cc-check-decls name ... |
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161 | # |
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162 | # Checks that each given name is either a preprocessor symbol or rvalue |
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163 | # such as an enum. Note that the define used is 'HAVE_DECL_xxx' |
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164 | # rather than 'HAVE_xxx'. |
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165 | proc cc-check-decls {args} { |
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166 | set ret 1 |
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167 | foreach name $args { |
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168 | msg-checking "Checking for $name..." |
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169 | set r [cctest_decl $name] |
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170 | define-feature "decl $name" $r |
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171 | if {$r} { |
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172 | msg-result "ok" |
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173 | } else { |
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174 | msg-result "not found" |
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175 | set ret 0 |
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176 | } |
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177 | } |
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178 | return $ret |
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179 | } |
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180 | |
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181 | # @cc-check-functions function ... |
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182 | # |
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183 | # Checks that the given functions exist (can be linked). |
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184 | proc cc-check-functions {args} { |
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185 | cc-check-some-feature $args { |
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186 | cctest_function $each |
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187 | } |
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188 | } |
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189 | |
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190 | # @cc-check-members type.member ... |
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191 | # |
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192 | # Checks that the given type/structure members exist. |
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193 | # A structure member is of the form 'struct stat.st_mtime'. |
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194 | proc cc-check-members {args} { |
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195 | cc-check-some-feature $args { |
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196 | cctest_member $each |
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197 | } |
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198 | } |
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199 | |
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200 | # @cc-check-function-in-lib function libs ?otherlibs? |
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201 | # |
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202 | # Checks that the given function can be found in one of the libs. |
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203 | # |
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204 | # First checks for no library required, then checks each of the libraries |
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205 | # in turn. |
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206 | # |
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207 | # If the function is found, the feature is defined and 'lib_$function' is defined |
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208 | # to '-l$lib' where the function was found, or "" if no library required. |
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209 | # In addition, '-l$lib' is prepended to the 'LIBS' define. |
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210 | # |
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211 | # If additional libraries may be needed for linking, they should be specified |
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212 | # with '$extralibs' as '-lotherlib1 -lotherlib2'. |
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213 | # These libraries are not automatically added to 'LIBS'. |
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214 | # |
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215 | # Returns 1 if found or 0 if not. |
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216 | # |
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217 | proc cc-check-function-in-lib {function libs {otherlibs {}}} { |
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218 | msg-checking "Checking libs for $function..." |
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219 | set found 0 |
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220 | cc-with [list -libs $otherlibs] { |
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221 | if {[cctest_function $function]} { |
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222 | msg-result "none needed" |
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223 | define lib_$function "" |
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224 | incr found |
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225 | } else { |
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226 | foreach lib $libs { |
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227 | cc-with [list -libs -l$lib] { |
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228 | if {[cctest_function $function]} { |
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229 | msg-result -l$lib |
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230 | define lib_$function -l$lib |
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231 | # prepend to LIBS |
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232 | define LIBS "-l$lib [get-define LIBS]" |
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233 | incr found |
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234 | break |
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235 | } |
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236 | } |
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237 | } |
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238 | } |
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239 | } |
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240 | define-feature $function $found |
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241 | if {!$found} { |
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242 | msg-result "no" |
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243 | } |
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244 | return $found |
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245 | } |
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246 | |
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247 | # @cc-check-tools tool ... |
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248 | # |
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249 | # Checks for existence of the given compiler tools, taking |
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250 | # into account any cross compilation prefix. |
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251 | # |
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252 | # For example, when checking for 'ar', first 'AR' is checked on the command |
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253 | # line and then in the environment. If not found, '${host}-ar' or |
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254 | # simply 'ar' is assumed depending upon whether cross compiling. |
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255 | # The path is searched for this executable, and if found 'AR' is defined |
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256 | # to the executable name. |
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257 | # Note that even when cross compiling, the simple 'ar' is used as a fallback, |
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258 | # but a warning is generated. This is necessary for some toolchains. |
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259 | # |
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260 | # It is an error if the executable is not found. |
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261 | # |
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262 | proc cc-check-tools {args} { |
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263 | foreach tool $args { |
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264 | msg-checking "Checking for $tool..." |
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265 | set TOOL [string toupper $tool] |
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266 | set exe [get-env $TOOL [get-define cross]$tool] |
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267 | if {[find-executable {*}$exe]} { |
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268 | define $TOOL $exe |
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269 | msg-result $exe |
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270 | continue |
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271 | } |
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272 | if {[find-executable {*}$tool]} { |
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273 | define $TOOL $tool |
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274 | msg-result $tool |
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275 | msg-result "Warning: Failed to find $exe, falling back to $tool which may be incorrect" |
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276 | continue |
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277 | } |
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278 | user-error "Failed to find $exe" |
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279 | } |
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280 | } |
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281 | |
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282 | # @cc-check-progs prog ... |
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283 | # |
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284 | # Checks for existence of the given executables on the path. |
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285 | # |
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286 | # For example, when checking for 'grep', the path is searched for |
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287 | # the executable, 'grep', and if found 'GREP' is defined as 'grep'. |
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288 | # |
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289 | # If the executable is not found, the variable is defined as 'false'. |
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290 | # Returns 1 if all programs were found, or 0 otherwise. |
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291 | # |
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292 | proc cc-check-progs {args} { |
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293 | set failed 0 |
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294 | foreach prog $args { |
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295 | set PROG [string toupper $prog] |
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296 | msg-checking "Checking for $prog..." |
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297 | if {![find-executable $prog]} { |
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298 | msg-result no |
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299 | define $PROG false |
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300 | incr failed |
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301 | } else { |
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302 | msg-result ok |
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303 | define $PROG $prog |
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304 | } |
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305 | } |
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306 | expr {!$failed} |
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307 | } |
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308 | |
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309 | # @cc-path-progs prog ... |
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310 | # |
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311 | # Like cc-check-progs, but sets the define to the full path rather |
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312 | # than just the program name. |
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313 | # |
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314 | proc cc-path-progs {args} { |
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315 | set failed 0 |
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316 | foreach prog $args { |
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317 | set PROG [string toupper $prog] |
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318 | msg-checking "Checking for $prog..." |
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319 | set path [find-executable-path $prog] |
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320 | if {$path eq ""} { |
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321 | msg-result no |
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322 | define $PROG false |
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323 | incr failed |
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324 | } else { |
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325 | msg-result $path |
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326 | define $PROG $path |
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327 | } |
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328 | } |
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329 | expr {!$failed} |
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330 | } |
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331 | |
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332 | # Adds the given settings to $::autosetup(ccsettings) and |
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333 | # returns the old settings. |
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334 | # |
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335 | proc cc-add-settings {settings} { |
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336 | if {[llength $settings] % 2} { |
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337 | autosetup-error "settings list is missing a value: $settings" |
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338 | } |
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339 | |
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340 | set prev [cc-get-settings] |
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341 | # workaround a bug in some versions of jimsh by forcing |
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342 | # conversion of $prev to a list |
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343 | llength $prev |
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344 | |
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345 | array set new $prev |
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346 | |
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347 | foreach {name value} $settings { |
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348 | switch -exact -- $name { |
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349 | -cflags - -includes { |
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350 | # These are given as lists |
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351 | lappend new($name) {*}[list-non-empty $value] |
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352 | } |
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353 | -declare { |
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354 | lappend new($name) $value |
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355 | } |
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356 | -libs { |
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357 | # Note that new libraries are added before previous libraries |
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358 | set new($name) [list {*}[list-non-empty $value] {*}$new($name)] |
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359 | } |
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360 | -link - -lang - -nooutput { |
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361 | set new($name) $value |
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362 | } |
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363 | -source - -sourcefile - -code { |
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364 | # XXX: These probably are only valid directly from cctest |
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365 | set new($name) $value |
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366 | } |
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367 | default { |
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368 | autosetup-error "unknown cctest setting: $name" |
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369 | } |
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370 | } |
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371 | } |
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372 | |
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373 | cc-store-settings [array get new] |
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374 | |
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375 | return $prev |
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376 | } |
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377 | |
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378 | proc cc-store-settings {new} { |
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379 | set ::autosetup(ccsettings) $new |
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380 | } |
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381 | |
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382 | proc cc-get-settings {} { |
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383 | return $::autosetup(ccsettings) |
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384 | } |
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385 | |
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386 | # Similar to cc-add-settings, but each given setting |
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387 | # simply replaces the existing value. |
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388 | # |
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389 | # Returns the previous settings |
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390 | proc cc-update-settings {args} { |
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391 | set prev [cc-get-settings] |
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392 | cc-store-settings [dict merge $prev $args] |
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393 | return $prev |
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394 | } |
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395 | |
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396 | # @cc-with settings ?{ script }? |
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397 | # |
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398 | # Sets the given 'cctest' settings and then runs the tests in '$script'. |
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399 | # Note that settings such as '-lang' replace the current setting, while |
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400 | # those such as '-includes' are appended to the existing setting. |
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401 | # |
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402 | # If no script is given, the settings become the default for the remainder |
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403 | # of the 'auto.def' file. |
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404 | # |
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405 | ## cc-with {-lang c++} { |
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406 | ## # This will check with the C++ compiler |
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407 | ## cc-check-types bool |
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408 | ## cc-with {-includes signal.h} { |
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409 | ## # This will check with the C++ compiler, signal.h and any existing includes. |
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410 | ## ... |
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411 | ## } |
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412 | ## # back to just the C++ compiler |
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413 | ## } |
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414 | # |
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415 | # The '-libs' setting is special in that newer values are added *before* earlier ones. |
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416 | # |
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417 | ## cc-with {-libs {-lc -lm}} { |
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418 | ## cc-with {-libs -ldl} { |
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419 | ## cctest -libs -lsocket ... |
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420 | ## # libs will be in this order: -lsocket -ldl -lc -lm |
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421 | ## } |
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422 | ## } |
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423 | proc cc-with {settings args} { |
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424 | if {[llength $args] == 0} { |
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425 | cc-add-settings $settings |
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426 | } elseif {[llength $args] > 1} { |
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427 | autosetup-error "usage: cc-with settings ?script?" |
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428 | } else { |
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429 | set save [cc-add-settings $settings] |
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430 | set rc [catch {uplevel 1 [lindex $args 0]} result info] |
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431 | cc-store-settings $save |
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432 | if {$rc != 0} { |
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433 | return -code [dict get $info -code] $result |
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434 | } |
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435 | return $result |
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436 | } |
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437 | } |
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438 | |
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439 | # @cctest ?settings? |
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440 | # |
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441 | # Low level C/C++ compiler checker. Compiles and or links a small C program |
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442 | # according to the arguments and returns 1 if OK, or 0 if not. |
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443 | # |
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444 | # Supported settings are: |
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445 | # |
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446 | ## -cflags cflags A list of flags to pass to the compiler |
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447 | ## -includes list A list of includes, e.g. {stdlib.h stdio.h} |
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448 | ## -declare code Code to declare before main() |
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449 | ## -link 1 Don't just compile, link too |
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450 | ## -lang c|c++ Use the C (default) or C++ compiler |
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451 | ## -libs liblist List of libraries to link, e.g. {-ldl -lm} |
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452 | ## -code code Code to compile in the body of main() |
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453 | ## -source code Compile a complete program. Ignore -includes, -declare and -code |
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454 | ## -sourcefile file Shorthand for -source [readfile [get-define srcdir]/$file] |
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455 | ## -nooutput 1 Treat any compiler output (e.g. a warning) as an error |
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456 | # |
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457 | # Unless '-source' or '-sourcefile' is specified, the C program looks like: |
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458 | # |
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459 | ## #include <firstinclude> /* same for remaining includes in the list */ |
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460 | ## |
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461 | ## declare-code /* any code in -declare, verbatim */ |
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462 | ## |
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463 | ## int main(void) { |
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464 | ## code /* any code in -code, verbatim */ |
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465 | ## return 0; |
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466 | ## } |
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467 | # |
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468 | # Any failures are recorded in 'config.log' |
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469 | # |
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470 | proc cctest {args} { |
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471 | set src conftest__.c |
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472 | set tmp conftest__ |
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473 | |
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474 | # Easiest way to merge in the settings |
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475 | cc-with $args { |
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476 | array set opts [cc-get-settings] |
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477 | } |
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478 | |
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479 | if {[info exists opts(-sourcefile)]} { |
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480 | set opts(-source) [readfile [get-define srcdir]/$opts(-sourcefile) "#error can't find $opts(-sourcefile)"] |
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481 | } |
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482 | if {[info exists opts(-source)]} { |
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483 | set lines $opts(-source) |
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484 | } else { |
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485 | foreach i $opts(-includes) { |
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486 | if {$opts(-code) ne "" && ![feature-checked $i]} { |
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487 | # Compiling real code with an unchecked header file |
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488 | # Quickly (and silently) check for it now |
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489 | |
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490 | # Remove all -includes from settings before checking |
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491 | set saveopts [cc-update-settings -includes {}] |
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492 | msg-quiet cc-check-includes $i |
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493 | cc-store-settings $saveopts |
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494 | } |
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495 | if {$opts(-code) eq "" || [have-feature $i]} { |
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496 | lappend source "#include <$i>" |
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497 | } |
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498 | } |
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499 | lappend source {*}$opts(-declare) |
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500 | lappend source "int main(void) {" |
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501 | lappend source $opts(-code) |
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502 | lappend source "return 0;" |
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503 | lappend source "}" |
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504 | |
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505 | set lines [join $source \n] |
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506 | } |
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507 | |
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508 | # Build the command line |
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509 | set cmdline {} |
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510 | switch -exact -- $opts(-lang) { |
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511 | c++ { |
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512 | lappend cmdline {*}[get-define CXX] {*}[get-define CXXFLAGS] |
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513 | } |
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514 | c { |
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515 | lappend cmdline {*}[get-define CC] {*}[get-define CFLAGS] |
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516 | } |
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517 | default { |
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518 | autosetup-error "cctest called with unknown language: $opts(-lang)" |
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519 | } |
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520 | } |
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521 | |
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522 | if {$opts(-link)} { |
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523 | lappend cmdline {*}[get-define LDFLAGS] |
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524 | } else { |
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525 | set tmp conftest__.o |
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526 | lappend cmdline -c |
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527 | } |
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528 | lappend cmdline {*}$opts(-cflags) {*}[get-define cc-default-debug ""] |
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529 | lappend cmdline $src -o $tmp {*}$opts(-libs) |
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530 | if {$opts(-link)} { |
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531 | lappend cmdline {*}[get-define LIBS] |
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532 | } |
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533 | |
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534 | # At this point we have the complete command line and the |
---|
535 | # complete source to be compiled. Get the result from cache if |
---|
536 | # we can |
---|
537 | if {[info exists ::cc_cache($cmdline,$lines)]} { |
---|
538 | msg-checking "(cached) " |
---|
539 | set ok $::cc_cache($cmdline,$lines) |
---|
540 | if {$::autosetup(debug)} { |
---|
541 | configlog "From cache (ok=$ok): [join $cmdline]" |
---|
542 | configlog "============" |
---|
543 | configlog $lines |
---|
544 | configlog "============" |
---|
545 | } |
---|
546 | return $ok |
---|
547 | } |
---|
548 | |
---|
549 | writefile $src $lines\n |
---|
550 | |
---|
551 | set ok 1 |
---|
552 | set err [catch {exec-with-stderr {*}$cmdline} result errinfo] |
---|
553 | if {$err || ($opts(-nooutput) && [string length $result])} { |
---|
554 | configlog "Failed: [join $cmdline]" |
---|
555 | configlog $result |
---|
556 | configlog "============" |
---|
557 | configlog "The failed code was:" |
---|
558 | configlog $lines |
---|
559 | configlog "============" |
---|
560 | set ok 0 |
---|
561 | } elseif {$::autosetup(debug)} { |
---|
562 | configlog "Compiled OK: [join $cmdline]" |
---|
563 | configlog "============" |
---|
564 | configlog $lines |
---|
565 | configlog "============" |
---|
566 | } |
---|
567 | file delete $src |
---|
568 | file delete $tmp |
---|
569 | |
---|
570 | # cache it |
---|
571 | set ::cc_cache($cmdline,$lines) $ok |
---|
572 | |
---|
573 | return $ok |
---|
574 | } |
---|
575 | |
---|
576 | # @make-autoconf-h outfile ?auto-patterns=HAVE_*? ?bare-patterns=SIZEOF_*? |
---|
577 | # |
---|
578 | # Deprecated - see 'make-config-header' |
---|
579 | proc make-autoconf-h {file {autopatterns {HAVE_*}} {barepatterns {SIZEOF_* HAVE_DECL_*}}} { |
---|
580 | user-notice "*** make-autoconf-h is deprecated -- use make-config-header instead" |
---|
581 | make-config-header $file -auto $autopatterns -bare $barepatterns |
---|
582 | } |
---|
583 | |
---|
584 | # @make-config-header outfile ?-auto patternlist? ?-bare patternlist? ?-none patternlist? ?-str patternlist? ... |
---|
585 | # |
---|
586 | # Examines all defined variables which match the given patterns |
---|
587 | # and writes an include file, '$file', which defines each of these. |
---|
588 | # Variables which match '-auto' are output as follows: |
---|
589 | # - defines which have the value '0' are ignored. |
---|
590 | # - defines which have integer values are defined as the integer value. |
---|
591 | # - any other value is defined as a string, e.g. '"value"' |
---|
592 | # Variables which match '-bare' are defined as-is. |
---|
593 | # Variables which match '-str' are defined as a string, e.g. '"value"' |
---|
594 | # Variables which match '-none' are omitted. |
---|
595 | # |
---|
596 | # Note that order is important. The first pattern that matches is selected. |
---|
597 | # Default behaviour is: |
---|
598 | # |
---|
599 | ## -bare {SIZEOF_* HAVE_DECL_*} -auto HAVE_* -none * |
---|
600 | # |
---|
601 | # If the file would be unchanged, it is not written. |
---|
602 | proc make-config-header {file args} { |
---|
603 | set guard _[string toupper [regsub -all {[^a-zA-Z0-9]} [file tail $file] _]] |
---|
604 | file mkdir [file dirname $file] |
---|
605 | set lines {} |
---|
606 | lappend lines "#ifndef $guard" |
---|
607 | lappend lines "#define $guard" |
---|
608 | |
---|
609 | # Add some defaults |
---|
610 | lappend args -bare {SIZEOF_* HAVE_DECL_*} -auto HAVE_* |
---|
611 | |
---|
612 | foreach n [lsort [dict keys [all-defines]]] { |
---|
613 | set value [get-define $n] |
---|
614 | set type [calc-define-output-type $n $args] |
---|
615 | switch -exact -- $type { |
---|
616 | -bare { |
---|
617 | # Just output the value unchanged |
---|
618 | } |
---|
619 | -none { |
---|
620 | continue |
---|
621 | } |
---|
622 | -str { |
---|
623 | set value \"[string map [list \\ \\\\ \" \\\"] $value]\" |
---|
624 | } |
---|
625 | -auto { |
---|
626 | # Automatically determine the type |
---|
627 | if {$value eq "0"} { |
---|
628 | lappend lines "/* #undef $n */" |
---|
629 | continue |
---|
630 | } |
---|
631 | if {![string is integer -strict $value]} { |
---|
632 | set value \"[string map [list \\ \\\\ \" \\\"] $value]\" |
---|
633 | } |
---|
634 | } |
---|
635 | "" { |
---|
636 | continue |
---|
637 | } |
---|
638 | default { |
---|
639 | autosetup-error "Unknown type in make-config-header: $type" |
---|
640 | } |
---|
641 | } |
---|
642 | lappend lines "#define $n $value" |
---|
643 | } |
---|
644 | lappend lines "#endif" |
---|
645 | set buf [join $lines \n] |
---|
646 | write-if-changed $file $buf { |
---|
647 | msg-result "Created $file" |
---|
648 | } |
---|
649 | } |
---|
650 | |
---|
651 | proc calc-define-output-type {name spec} { |
---|
652 | foreach {type patterns} $spec { |
---|
653 | foreach pattern $patterns { |
---|
654 | if {[string match $pattern $name]} { |
---|
655 | return $type |
---|
656 | } |
---|
657 | } |
---|
658 | } |
---|
659 | return "" |
---|
660 | } |
---|
661 | |
---|
662 | # Initialise some values from the environment or commandline or default settings |
---|
663 | foreach i {LDFLAGS LIBS CPPFLAGS LINKFLAGS CFLAGS} { |
---|
664 | lassign $i var default |
---|
665 | define $var [get-env $var $default] |
---|
666 | } |
---|
667 | |
---|
668 | if {[env-is-set CC]} { |
---|
669 | # Set by the user, so don't try anything else |
---|
670 | set try [list [get-env CC ""]] |
---|
671 | } else { |
---|
672 | # Try some reasonable options |
---|
673 | set try [list [get-define cross]gcc [get-define cross]clang [get-define cross]cc] |
---|
674 | } |
---|
675 | define CC [find-an-executable {*}$try] |
---|
676 | if {[get-define CC] eq ""} { |
---|
677 | user-error "Could not find a C compiler. Tried: [join $try ", "]" |
---|
678 | } |
---|
679 | |
---|
680 | define CPP [get-env CPP "[get-define CC] -E"] |
---|
681 | |
---|
682 | # XXX: Could avoid looking for a C++ compiler until requested |
---|
683 | # Note that if CXX isn't found, we just set it to "false". It might not be needed. |
---|
684 | if {[env-is-set CXX]} { |
---|
685 | define CXX [find-an-executable -required [get-env CXX ""]] |
---|
686 | } else { |
---|
687 | define CXX [find-an-executable [get-define cross]g++ [get-define cross]clang++ [get-define cross]c++ false] |
---|
688 | } |
---|
689 | |
---|
690 | # CXXFLAGS default to CFLAGS if not specified |
---|
691 | define CXXFLAGS [get-env CXXFLAGS [get-define CFLAGS]] |
---|
692 | |
---|
693 | # May need a CC_FOR_BUILD, so look for one |
---|
694 | define CC_FOR_BUILD [find-an-executable [get-env CC_FOR_BUILD ""] gcc clang cc false] |
---|
695 | |
---|
696 | if {[get-define CC] eq ""} { |
---|
697 | user-error "Could not find a C compiler. Tried: [join $try ", "]" |
---|
698 | } |
---|
699 | |
---|
700 | define CCACHE [find-an-executable [get-env CCACHE ccache]] |
---|
701 | |
---|
702 | # Initial cctest settings |
---|
703 | cc-store-settings {-cflags {} -includes {} -declare {} -link 0 -lang c -libs {} -code {} -nooutput 0} |
---|
704 | set autosetup(cc-include-deps) {} |
---|
705 | |
---|
706 | msg-result "C compiler...[get-define CC] [get-define CFLAGS]" |
---|
707 | if {[get-define CXX] ne "false"} { |
---|
708 | msg-result "C++ compiler...[get-define CXX] [get-define CXXFLAGS]" |
---|
709 | } |
---|
710 | msg-result "Build C compiler...[get-define CC_FOR_BUILD]" |
---|
711 | |
---|
712 | # On Darwin, we prefer to use -g0 to avoid creating .dSYM directories |
---|
713 | # but some compilers may not support it, so test here. |
---|
714 | switch -glob -- [get-define host] { |
---|
715 | *-*-darwin* { |
---|
716 | if {[cctest -cflags {-g0}]} { |
---|
717 | define cc-default-debug -g0 |
---|
718 | } |
---|
719 | } |
---|
720 | } |
---|
721 | |
---|
722 | if {![cc-check-includes stdlib.h]} { |
---|
723 | user-error "Compiler does not work. See config.log" |
---|
724 | } |
---|