1 | # =========================================================================== |
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2 | # http://www.gnu.org/software/autoconf-archive/ax_pthread.html |
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3 | # =========================================================================== |
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4 | # |
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5 | # SYNOPSIS |
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6 | # |
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7 | # AX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]]) |
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8 | # |
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9 | # DESCRIPTION |
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10 | # |
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11 | # This macro figures out how to build C programs using POSIX threads. It |
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12 | # sets the PTHREAD_LIBS output variable to the threads library and linker |
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13 | # flags, and the PTHREAD_CFLAGS output variable to any special C compiler |
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14 | # flags that are needed. (The user can also force certain compiler |
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15 | # flags/libs to be tested by setting these environment variables.) |
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16 | # |
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17 | # Also sets PTHREAD_CC to any special C compiler that is needed for |
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18 | # multi-threaded programs (defaults to the value of CC otherwise). (This |
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19 | # is necessary on AIX to use the special cc_r compiler alias.) |
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20 | # |
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21 | # NOTE: You are assumed to not only compile your program with these flags, |
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22 | # but also to link with them as well. For example, you might link with |
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23 | # $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS |
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24 | # |
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25 | # If you are only building threaded programs, you may wish to use these |
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26 | # variables in your default LIBS, CFLAGS, and CC: |
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27 | # |
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28 | # LIBS="$PTHREAD_LIBS $LIBS" |
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29 | # CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
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30 | # CC="$PTHREAD_CC" |
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31 | # |
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32 | # In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute constant |
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33 | # has a nonstandard name, this macro defines PTHREAD_CREATE_JOINABLE to |
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34 | # that name (e.g. PTHREAD_CREATE_UNDETACHED on AIX). |
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35 | # |
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36 | # Also HAVE_PTHREAD_PRIO_INHERIT is defined if pthread is found and the |
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37 | # PTHREAD_PRIO_INHERIT symbol is defined when compiling with |
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38 | # PTHREAD_CFLAGS. |
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39 | # |
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40 | # ACTION-IF-FOUND is a list of shell commands to run if a threads library |
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41 | # is found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it |
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42 | # is not found. If ACTION-IF-FOUND is not specified, the default action |
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43 | # will define HAVE_PTHREAD. |
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44 | # |
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45 | # Please let the authors know if this macro fails on any platform, or if |
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46 | # you have any other suggestions or comments. This macro was based on work |
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47 | # by SGJ on autoconf scripts for FFTW (http://www.fftw.org/) (with help |
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48 | # from M. Frigo), as well as ac_pthread and hb_pthread macros posted by |
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49 | # Alejandro Forero Cuervo to the autoconf macro repository. We are also |
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50 | # grateful for the helpful feedback of numerous users. |
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51 | # |
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52 | # Updated for Autoconf 2.68 by Daniel Richard G. |
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53 | # |
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54 | # LICENSE |
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55 | # |
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56 | # Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu> |
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57 | # Copyright (c) 2011 Daniel Richard G. <skunk@iSKUNK.ORG> |
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58 | # |
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59 | # This program is free software: you can redistribute it and/or modify it |
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60 | # under the terms of the GNU General Public License as published by the |
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61 | # Free Software Foundation, either version 3 of the License, or (at your |
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62 | # option) any later version. |
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63 | # |
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64 | # This program is distributed in the hope that it will be useful, but |
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65 | # WITHOUT ANY WARRANTY; without even the implied warranty of |
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66 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
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67 | # Public License for more details. |
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68 | # |
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69 | # You should have received a copy of the GNU General Public License along |
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70 | # with this program. If not, see <http://www.gnu.org/licenses/>. |
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71 | # |
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72 | # As a special exception, the respective Autoconf Macro's copyright owner |
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73 | # gives unlimited permission to copy, distribute and modify the configure |
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74 | # scripts that are the output of Autoconf when processing the Macro. You |
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75 | # need not follow the terms of the GNU General Public License when using |
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76 | # or distributing such scripts, even though portions of the text of the |
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77 | # Macro appear in them. The GNU General Public License (GPL) does govern |
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78 | # all other use of the material that constitutes the Autoconf Macro. |
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79 | # |
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80 | # This special exception to the GPL applies to versions of the Autoconf |
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81 | # Macro released by the Autoconf Archive. When you make and distribute a |
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82 | # modified version of the Autoconf Macro, you may extend this special |
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83 | # exception to the GPL to apply to your modified version as well. |
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84 | |
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85 | #serial 23 |
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86 | |
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87 | AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD]) |
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88 | AC_DEFUN([AX_PTHREAD], [ |
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89 | AC_REQUIRE([AC_CANONICAL_HOST]) |
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90 | AC_REQUIRE([AC_PROG_CC]) |
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91 | AC_REQUIRE([AC_PROG_SED]) |
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92 | AC_LANG_PUSH([C]) |
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93 | ax_pthread_ok=no |
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94 | |
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95 | # We used to check for pthread.h first, but this fails if pthread.h |
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96 | # requires special compiler flags (e.g. on Tru64 or Sequent). |
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97 | # It gets checked for in the link test anyway. |
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98 | |
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99 | # First of all, check if the user has set any of the PTHREAD_LIBS, |
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100 | # etcetera environment variables, and if threads linking works using |
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101 | # them: |
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102 | if test "x$PTHREAD_CFLAGS$PTHREAD_LIBS" != "x"; then |
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103 | ax_pthread_save_CC="$CC" |
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104 | ax_pthread_save_CFLAGS="$CFLAGS" |
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105 | ax_pthread_save_LIBS="$LIBS" |
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106 | AS_IF([test "x$PTHREAD_CC" != "x"], [CC="$PTHREAD_CC"]) |
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107 | CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
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108 | LIBS="$PTHREAD_LIBS $LIBS" |
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109 | AC_MSG_CHECKING([for pthread_join using $CC $PTHREAD_CFLAGS $PTHREAD_LIBS]) |
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110 | AC_LINK_IFELSE([AC_LANG_CALL([], [pthread_join])], [ax_pthread_ok=yes]) |
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111 | AC_MSG_RESULT([$ax_pthread_ok]) |
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112 | if test "x$ax_pthread_ok" = "xno"; then |
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113 | PTHREAD_LIBS="" |
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114 | PTHREAD_CFLAGS="" |
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115 | fi |
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116 | CC="$ax_pthread_save_CC" |
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117 | CFLAGS="$ax_pthread_save_CFLAGS" |
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118 | LIBS="$ax_pthread_save_LIBS" |
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119 | fi |
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120 | |
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121 | # We must check for the threads library under a number of different |
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122 | # names; the ordering is very important because some systems |
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123 | # (e.g. DEC) have both -lpthread and -lpthreads, where one of the |
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124 | # libraries is broken (non-POSIX). |
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125 | |
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126 | # Create a list of thread flags to try. Items starting with a "-" are |
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127 | # C compiler flags, and other items are library names, except for "none" |
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128 | # which indicates that we try without any flags at all, and "pthread-config" |
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129 | # which is a program returning the flags for the Pth emulation library. |
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130 | |
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131 | ax_pthread_flags="pthreads none -Kthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config" |
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132 | |
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133 | # The ordering *is* (sometimes) important. Some notes on the |
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134 | # individual items follow: |
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135 | |
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136 | # pthreads: AIX (must check this before -lpthread) |
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137 | # none: in case threads are in libc; should be tried before -Kthread and |
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138 | # other compiler flags to prevent continual compiler warnings |
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139 | # -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h) |
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140 | # -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads), Tru64 |
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141 | # (Note: HP C rejects this with "bad form for `-t' option") |
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142 | # -pthreads: Solaris/gcc (Note: HP C also rejects) |
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143 | # -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it |
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144 | # doesn't hurt to check since this sometimes defines pthreads and |
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145 | # -D_REENTRANT too), HP C (must be checked before -lpthread, which |
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146 | # is present but should not be used directly; and before -mthreads, |
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147 | # because the compiler interprets this as "-mt" + "-hreads") |
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148 | # -mthreads: Mingw32/gcc, Lynx/gcc |
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149 | # pthread: Linux, etcetera |
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150 | # --thread-safe: KAI C++ |
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151 | # pthread-config: use pthread-config program (for GNU Pth library) |
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152 | |
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153 | case $host_os in |
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154 | |
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155 | freebsd*) |
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156 | |
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157 | # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able) |
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158 | # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread) |
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159 | |
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160 | ax_pthread_flags="-kthread lthread $ax_pthread_flags" |
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161 | ;; |
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162 | |
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163 | hpux*) |
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164 | |
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165 | # From the cc(1) man page: "[-mt] Sets various -D flags to enable |
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166 | # multi-threading and also sets -lpthread." |
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167 | |
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168 | ax_pthread_flags="-mt -pthread pthread $ax_pthread_flags" |
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169 | ;; |
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170 | |
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171 | openedition*) |
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172 | |
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173 | # IBM z/OS requires a feature-test macro to be defined in order to |
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174 | # enable POSIX threads at all, so give the user a hint if this is |
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175 | # not set. (We don't define these ourselves, as they can affect |
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176 | # other portions of the system API in unpredictable ways.) |
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177 | |
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178 | AC_EGREP_CPP([AX_PTHREAD_ZOS_MISSING], |
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179 | [ |
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180 | # if !defined(_OPEN_THREADS) && !defined(_UNIX03_THREADS) |
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181 | AX_PTHREAD_ZOS_MISSING |
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182 | # endif |
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183 | ], |
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184 | [AC_MSG_WARN([IBM z/OS requires -D_OPEN_THREADS or -D_UNIX03_THREADS to enable pthreads support.])]) |
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185 | ;; |
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186 | |
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187 | solaris*) |
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188 | |
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189 | # On Solaris (at least, for some versions), libc contains stubbed |
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190 | # (non-functional) versions of the pthreads routines, so link-based |
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191 | # tests will erroneously succeed. (N.B.: The stubs are missing |
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192 | # pthread_cleanup_push, or rather a function called by this macro, |
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193 | # so we could check for that, but who knows whether they'll stub |
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194 | # that too in a future libc.) So we'll check first for the |
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195 | # standard Solaris way of linking pthreads (-mt -lpthread). |
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196 | |
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197 | ax_pthread_flags="-mt,pthread pthread $ax_pthread_flags" |
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198 | ;; |
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199 | esac |
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200 | |
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201 | # GCC generally uses -pthread, or -pthreads on some platforms (e.g. SPARC) |
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202 | |
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203 | AS_IF([test "x$GCC" = "xyes"], |
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204 | [ax_pthread_flags="-pthread -pthreads $ax_pthread_flags"]) |
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205 | |
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206 | # The presence of a feature test macro requesting re-entrant function |
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207 | # definitions is, on some systems, a strong hint that pthreads support is |
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208 | # correctly enabled |
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209 | |
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210 | case $host_os in |
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211 | darwin* | hpux* | linux* | osf* | solaris*) |
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212 | ax_pthread_check_macro="_REENTRANT" |
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213 | ;; |
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214 | |
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215 | aix*) |
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216 | ax_pthread_check_macro="_THREAD_SAFE" |
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217 | ;; |
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218 | |
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219 | *) |
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220 | ax_pthread_check_macro="--" |
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221 | ;; |
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222 | esac |
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223 | AS_IF([test "x$ax_pthread_check_macro" = "x--"], |
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224 | [ax_pthread_check_cond=0], |
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225 | [ax_pthread_check_cond="!defined($ax_pthread_check_macro)"]) |
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226 | |
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227 | # Are we compiling with Clang? |
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228 | |
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229 | AC_CACHE_CHECK([whether $CC is Clang], |
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230 | [ax_cv_PTHREAD_CLANG], |
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231 | [ax_cv_PTHREAD_CLANG=no |
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232 | # Note that Autoconf sets GCC=yes for Clang as well as GCC |
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233 | if test "x$GCC" = "xyes"; then |
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234 | AC_EGREP_CPP([AX_PTHREAD_CC_IS_CLANG], |
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235 | [/* Note: Clang 2.7 lacks __clang_[a-z]+__ */ |
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236 | # if defined(__clang__) && defined(__llvm__) |
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237 | AX_PTHREAD_CC_IS_CLANG |
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238 | # endif |
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239 | ], |
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240 | [ax_cv_PTHREAD_CLANG=yes]) |
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241 | fi |
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242 | ]) |
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243 | ax_pthread_clang="$ax_cv_PTHREAD_CLANG" |
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244 | |
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245 | ax_pthread_clang_warning=no |
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246 | |
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247 | # Clang needs special handling, because older versions handle the -pthread |
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248 | # option in a rather... idiosyncratic way |
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249 | |
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250 | if test "x$ax_pthread_clang" = "xyes"; then |
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251 | |
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252 | # Clang takes -pthread; it has never supported any other flag |
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253 | |
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254 | # (Note 1: This will need to be revisited if a system that Clang |
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255 | # supports has POSIX threads in a separate library. This tends not |
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256 | # to be the way of modern systems, but it's conceivable.) |
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257 | |
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258 | # (Note 2: On some systems, notably Darwin, -pthread is not needed |
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259 | # to get POSIX threads support; the API is always present and |
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260 | # active. We could reasonably leave PTHREAD_CFLAGS empty. But |
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261 | # -pthread does define _REENTRANT, and while the Darwin headers |
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262 | # ignore this macro, third-party headers might not.) |
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263 | |
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264 | PTHREAD_CFLAGS="-pthread" |
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265 | PTHREAD_LIBS= |
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266 | |
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267 | ax_pthread_ok=yes |
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268 | |
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269 | # However, older versions of Clang make a point of warning the user |
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270 | # that, in an invocation where only linking and no compilation is |
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271 | # taking place, the -pthread option has no effect ("argument unused |
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272 | # during compilation"). They expect -pthread to be passed in only |
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273 | # when source code is being compiled. |
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274 | # |
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275 | # Problem is, this is at odds with the way Automake and most other |
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276 | # C build frameworks function, which is that the same flags used in |
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277 | # compilation (CFLAGS) are also used in linking. Many systems |
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278 | # supported by AX_PTHREAD require exactly this for POSIX threads |
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279 | # support, and in fact it is often not straightforward to specify a |
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280 | # flag that is used only in the compilation phase and not in |
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281 | # linking. Such a scenario is extremely rare in practice. |
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282 | # |
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283 | # Even though use of the -pthread flag in linking would only print |
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284 | # a warning, this can be a nuisance for well-run software projects |
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285 | # that build with -Werror. So if the active version of Clang has |
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286 | # this misfeature, we search for an option to squash it. |
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287 | |
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288 | AC_CACHE_CHECK([whether Clang needs flag to prevent "argument unused" warning when linking with -pthread], |
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289 | [ax_cv_PTHREAD_CLANG_NO_WARN_FLAG], |
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290 | [ax_cv_PTHREAD_CLANG_NO_WARN_FLAG=unknown |
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291 | # Create an alternate version of $ac_link that compiles and |
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292 | # links in two steps (.c -> .o, .o -> exe) instead of one |
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293 | # (.c -> exe), because the warning occurs only in the second |
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294 | # step |
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295 | ax_pthread_save_ac_link="$ac_link" |
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296 | ax_pthread_sed='s/conftest\.\$ac_ext/conftest.$ac_objext/g' |
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297 | ax_pthread_link_step=`$as_echo "$ac_link" | sed "$ax_pthread_sed"` |
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298 | ax_pthread_2step_ac_link="($ac_compile) && (echo ==== >&5) && ($ax_pthread_link_step)" |
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299 | ax_pthread_save_CFLAGS="$CFLAGS" |
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300 | for ax_pthread_try in '' -Qunused-arguments -Wno-unused-command-line-argument unknown; do |
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301 | AS_IF([test "x$ax_pthread_try" = "xunknown"], [break]) |
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302 | CFLAGS="-Werror -Wunknown-warning-option $ax_pthread_try -pthread $ax_pthread_save_CFLAGS" |
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303 | ac_link="$ax_pthread_save_ac_link" |
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304 | AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])], |
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305 | [ac_link="$ax_pthread_2step_ac_link" |
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306 | AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])], |
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307 | [break]) |
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308 | ]) |
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309 | done |
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310 | ac_link="$ax_pthread_save_ac_link" |
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311 | CFLAGS="$ax_pthread_save_CFLAGS" |
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312 | AS_IF([test "x$ax_pthread_try" = "x"], [ax_pthread_try=no]) |
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313 | ax_cv_PTHREAD_CLANG_NO_WARN_FLAG="$ax_pthread_try" |
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314 | ]) |
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315 | |
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316 | case "$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG" in |
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317 | no | unknown) ;; |
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318 | *) PTHREAD_CFLAGS="$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG $PTHREAD_CFLAGS" ;; |
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319 | esac |
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320 | |
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321 | fi # $ax_pthread_clang = yes |
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322 | |
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323 | if test "x$ax_pthread_ok" = "xno"; then |
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324 | for ax_pthread_try_flag in $ax_pthread_flags; do |
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325 | |
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326 | case $ax_pthread_try_flag in |
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327 | none) |
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328 | AC_MSG_CHECKING([whether pthreads work without any flags]) |
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329 | ;; |
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330 | |
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331 | -mt,pthread) |
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332 | AC_MSG_CHECKING([whether pthreads work with -mt -lpthread]) |
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333 | PTHREAD_CFLAGS="-mt" |
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334 | PTHREAD_LIBS="-lpthread" |
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335 | ;; |
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336 | |
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337 | -*) |
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338 | AC_MSG_CHECKING([whether pthreads work with $ax_pthread_try_flag]) |
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339 | PTHREAD_CFLAGS="$ax_pthread_try_flag" |
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340 | ;; |
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341 | |
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342 | pthread-config) |
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343 | AC_CHECK_PROG([ax_pthread_config], [pthread-config], [yes], [no]) |
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344 | AS_IF([test "x$ax_pthread_config" = "xno"], [continue]) |
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345 | PTHREAD_CFLAGS="`pthread-config --cflags`" |
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346 | PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`" |
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347 | ;; |
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348 | |
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349 | *) |
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350 | AC_MSG_CHECKING([for the pthreads library -l$ax_pthread_try_flag]) |
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351 | PTHREAD_LIBS="-l$ax_pthread_try_flag" |
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352 | ;; |
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353 | esac |
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354 | |
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355 | ax_pthread_save_CFLAGS="$CFLAGS" |
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356 | ax_pthread_save_LIBS="$LIBS" |
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357 | CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
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358 | LIBS="$PTHREAD_LIBS $LIBS" |
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359 | |
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360 | # Check for various functions. We must include pthread.h, |
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361 | # since some functions may be macros. (On the Sequent, we |
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362 | # need a special flag -Kthread to make this header compile.) |
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363 | # We check for pthread_join because it is in -lpthread on IRIX |
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364 | # while pthread_create is in libc. We check for pthread_attr_init |
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365 | # due to DEC craziness with -lpthreads. We check for |
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366 | # pthread_cleanup_push because it is one of the few pthread |
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367 | # functions on Solaris that doesn't have a non-functional libc stub. |
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368 | # We try pthread_create on general principles. |
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369 | |
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370 | AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h> |
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371 | # if $ax_pthread_check_cond |
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372 | # error "$ax_pthread_check_macro must be defined" |
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373 | # endif |
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374 | static void routine(void *a) { a = 0; } |
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375 | static void *start_routine(void *a) { return a; }], |
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376 | [pthread_t th; pthread_attr_t attr; |
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377 | pthread_create(&th, 0, start_routine, 0); |
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378 | pthread_join(th, 0); |
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379 | pthread_attr_init(&attr); |
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380 | pthread_cleanup_push(routine, 0); |
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381 | pthread_cleanup_pop(0) /* ; */])], |
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382 | [ax_pthread_ok=yes], |
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383 | []) |
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384 | |
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385 | CFLAGS="$ax_pthread_save_CFLAGS" |
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386 | LIBS="$ax_pthread_save_LIBS" |
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387 | |
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388 | AC_MSG_RESULT([$ax_pthread_ok]) |
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389 | AS_IF([test "x$ax_pthread_ok" = "xyes"], [break]) |
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390 | |
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391 | PTHREAD_LIBS="" |
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392 | PTHREAD_CFLAGS="" |
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393 | done |
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394 | fi |
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395 | |
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396 | # Various other checks: |
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397 | if test "x$ax_pthread_ok" = "xyes"; then |
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398 | ax_pthread_save_CFLAGS="$CFLAGS" |
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399 | ax_pthread_save_LIBS="$LIBS" |
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400 | CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
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401 | LIBS="$PTHREAD_LIBS $LIBS" |
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402 | |
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403 | # Detect AIX lossage: JOINABLE attribute is called UNDETACHED. |
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404 | AC_CACHE_CHECK([for joinable pthread attribute], |
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405 | [ax_cv_PTHREAD_JOINABLE_ATTR], |
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406 | [ax_cv_PTHREAD_JOINABLE_ATTR=unknown |
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407 | for ax_pthread_attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do |
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408 | AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>], |
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409 | [int attr = $ax_pthread_attr; return attr /* ; */])], |
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410 | [ax_cv_PTHREAD_JOINABLE_ATTR=$ax_pthread_attr; break], |
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411 | []) |
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412 | done |
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413 | ]) |
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414 | AS_IF([test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xunknown" && \ |
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415 | test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xPTHREAD_CREATE_JOINABLE" && \ |
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416 | test "x$ax_pthread_joinable_attr_defined" != "xyes"], |
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417 | [AC_DEFINE_UNQUOTED([PTHREAD_CREATE_JOINABLE], |
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418 | [$ax_cv_PTHREAD_JOINABLE_ATTR], |
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419 | [Define to necessary symbol if this constant |
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420 | uses a non-standard name on your system.]) |
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421 | ax_pthread_joinable_attr_defined=yes |
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422 | ]) |
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423 | |
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424 | AC_CACHE_CHECK([whether more special flags are required for pthreads], |
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425 | [ax_cv_PTHREAD_SPECIAL_FLAGS], |
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426 | [ax_cv_PTHREAD_SPECIAL_FLAGS=no |
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427 | case $host_os in |
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428 | solaris*) |
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429 | ax_cv_PTHREAD_SPECIAL_FLAGS="-D_POSIX_PTHREAD_SEMANTICS" |
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430 | ;; |
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431 | esac |
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432 | ]) |
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433 | AS_IF([test "x$ax_cv_PTHREAD_SPECIAL_FLAGS" != "xno" && \ |
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434 | test "x$ax_pthread_special_flags_added" != "xyes"], |
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435 | [PTHREAD_CFLAGS="$ax_cv_PTHREAD_SPECIAL_FLAGS $PTHREAD_CFLAGS" |
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436 | ax_pthread_special_flags_added=yes]) |
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437 | |
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438 | AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT], |
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439 | [ax_cv_PTHREAD_PRIO_INHERIT], |
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440 | [AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>]], |
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441 | [[int i = PTHREAD_PRIO_INHERIT;]])], |
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442 | [ax_cv_PTHREAD_PRIO_INHERIT=yes], |
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443 | [ax_cv_PTHREAD_PRIO_INHERIT=no]) |
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444 | ]) |
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445 | AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes" && \ |
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446 | test "x$ax_pthread_prio_inherit_defined" != "xyes"], |
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447 | [AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], [1], [Have PTHREAD_PRIO_INHERIT.]) |
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448 | ax_pthread_prio_inherit_defined=yes |
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449 | ]) |
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450 | |
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451 | CFLAGS="$ax_pthread_save_CFLAGS" |
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452 | LIBS="$ax_pthread_save_LIBS" |
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453 | |
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454 | # More AIX lossage: compile with *_r variant |
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455 | if test "x$GCC" != "xyes"; then |
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456 | case $host_os in |
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457 | aix*) |
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458 | AS_CASE(["x/$CC"], |
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459 | [x*/c89|x*/c89_128|x*/c99|x*/c99_128|x*/cc|x*/cc128|x*/xlc|x*/xlc_v6|x*/xlc128|x*/xlc128_v6], |
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460 | [#handle absolute path differently from PATH based program lookup |
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461 | AS_CASE(["x$CC"], |
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462 | [x/*], |
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463 | [AS_IF([AS_EXECUTABLE_P([${CC}_r])],[PTHREAD_CC="${CC}_r"])], |
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464 | [AC_CHECK_PROGS([PTHREAD_CC],[${CC}_r],[$CC])])]) |
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465 | ;; |
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466 | esac |
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467 | fi |
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468 | fi |
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469 | |
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470 | test -n "$PTHREAD_CC" || PTHREAD_CC="$CC" |
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471 | |
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472 | AC_SUBST([PTHREAD_LIBS]) |
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473 | AC_SUBST([PTHREAD_CFLAGS]) |
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474 | AC_SUBST([PTHREAD_CC]) |
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475 | |
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476 | # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND: |
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477 | if test "x$ax_pthread_ok" = "xyes"; then |
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478 | ifelse([$1],,[AC_DEFINE([HAVE_PTHREAD],[1],[Define if you have POSIX threads libraries and header files.])],[$1]) |
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479 | : |
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480 | else |
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481 | ax_pthread_ok=no |
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482 | $2 |
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483 | fi |
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484 | AC_LANG_POP |
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485 | ])dnl AX_PTHREAD |
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