source: git/m4/ntl-check.m4 @ f86531

# Check for NTL
# Bradford Hovinen, 2001-06-13
# Modified by Pascal Giorgi, 2003-12-03
# Inspired by gnome-bonobo-check.m4 by Miguel de Icaza, 99-04-12
# Stolen from Chris Lahey       99-2-5
# stolen from Manish Singh again
# stolen back from Frank Belew
# stolen from Manish Singh
# Shamelessly stolen from Owen Taylor

dnl LB_CHECK_NTL ([MINIMUM-VERSION [, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
dnl
dnl Test for Victor Shoup's NTL (Number Theory Library) and define
dnl NTL_CFLAGS and NTL_LIBS

AC_DEFUN([LB_CHECK_NTL],
[
DEFAULT_CHECKING_PATH="/usr /usr/local /sw /opt/local"

AC_ARG_WITH(ntl,
[  --with-ntl=<path>|yes|no  Use NTL library. If argument is no, you do not have
                            the library installed on your machine (set as 
                            default). If argument is yes or <empty> that means 
                            the library is reachable with the standard search 
                            path (/usr or /usr/local). Otherwise you give the 
                            <path> to the directory which contain the library. 
             ],
             [if test "$withval" = yes ; then
                        NTL_HOME_PATH="${DEFAULT_CHECKING_PATH}"
              elif test "$withval" != no ; then
                        NTL_HOME_PATH="$withval"
             fi],
             [NTL_HOME_PATH="${DEFAULT_CHECKING_PATH}"])

min_ntl_version=ifelse([$1], ,1.0,$1)


dnl Check for existence
BACKUP_CXXFLAGS=${CXXFLAGS}
BACKUP_LIBS=${LIBS}

AC_LANG_PUSH(C++)

if test -n "$NTL_HOME_PATH"; then
AC_MSG_CHECKING(for NTL >= $min_ntl_version)
fi

for NTL_HOME in ${NTL_HOME_PATH} 
 do     
if test -r "$NTL_HOME/include/NTL/ZZ.h"; then

        if test "x$NTL_HOME" != "x/usr"; then
                NTL_CFLAGS="-I${NTL_HOME}/include"
                NTL_LIBS="-L${NTL_HOME}/lib -lntl"
        else
                NTL_CFLAGS=
                NTL_LIBS="-lntl"                
        fi      
        CXXFLAGS="${BACKUP_CXXFLAGS} ${NTL_CFLAGS} ${GMP_CFLAGS}" 
        LIBS="${BACKUP_LIBS} ${NTL_LIBS} ${GMP_LIBS}"

        AC_TRY_LINK(
        [#include <NTL/ZZ.h>],
        [NTL::ZZ a;],
        [
        AC_TRY_RUN(
        [#include <NTL/version.h>
        int main () { if (NTL_MAJOR_VERSION < 5) return -1; else return 0; }    
        ],[
        ntl_found="yes" 
        break
        ],[     
        ntl_problem="$problem $NTL_HOME"        
        unset NTL_CFLAGS
        unset NTL_LIBS  
        ],[
        ntl_found="yes"
        ntl_cross="yes" 
        break
        ])      
        ],
        [
        ntl_found="no"
        ntl_checked="$checked $NTL_HOME"
        unset NTL_CFLAGS
        unset NTL_LIBS  
        ])
else
        ntl_found="no"
fi
done

if test "x$ntl_found" = "xyes" ; then           
        AC_SUBST(NTL_CFLAGS)
        AC_SUBST(NTL_LIBS)
        AC_DEFINE(HAVE_NTL,1,[Define if NTL is installed])
        HAVE_NTL=yes
        if test "x$ntl_cross" != "xyes"; then
                AC_MSG_RESULT(found)
        else
                AC_MSG_RESULT(unknown)
                echo "WARNING: You appear to be cross compiling, so there is no way to determine"
                echo "whether your NTL version is new enough. I am assuming it is."
        fi
        ifelse([$2], , :, [$2])
elif test -n "$ntl_problem"; then
        AC_MSG_RESULT(problem)
        echo "Sorry, your NTL version is too old. Disabling."
        ifelse([$3], , :, [$3])
elif test   "x$ntl_found" = "xno";  then
        AC_MSG_RESULT(not found)
        ifelse([$3], , :, [$3]) 
fi      

AC_LANG_POP

AM_CONDITIONAL(SING_HAVE_NTL, test "x$HAVE_NTL" = "xyes")

# TODO: The following seems to set CXXFLAGS even if it was not defined previously!!!!
CXXFLAGS=${BACKUP_CXXFLAGS}
LIBS=${BACKUP_LIBS}
#unset LD_LIBRARY_PATH

])