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dnl Check checks whether dlsym (if present) requires a leading underscore.
dnl Written by Dan Hagerty <hag@ai.mit.edu> for scsh-0.5.0.
AC_DEFUN(GTKGRAPH_DLSYM_USCORE, [
AC_MSG_CHECKING(for underscore before symbols)
AC_CACHE_VAL(gtkgraph_cv_uscore,[
echo "main(){int i=1;}
fnord(){int i=23; int ltuae=42;}" > conftest.c
${CC} conftest.c > /dev/null
if (nm a.out | grep _fnord) > /dev/null; then
gtkgraph_cv_uscore=yes
else
gtkgraph_cv_uscore=no
fi])
AC_MSG_RESULT($gtkgraph_cv_uscore)
rm -f conftest.c a.out
if test $gtkgraph_cv_uscore = yes; then
AC_DEFINE(USCORE)
if test $ac_cv_func_dlopen = yes -o $ac_cv_lib_dl_dlopen = yes ; then
AC_MSG_CHECKING(whether dlsym always adds an underscore for us)
AC_CACHE_VAL(gtkgraph_cv_dlsym_adds_uscore,AC_TRY_RUN( [
#include <dlfcn.h>
#include <stdio.h>
fnord() { int i=42;}
main() { void *self, *ptr1, *ptr2; self=dlopen(NULL,RTLD_LAZY);
if(self) { ptr1=dlsym(self,"fnord"); ptr2=dlsym(self,"_fnord");
if(ptr1 && !ptr2) exit(0); } exit(1); }
], [gtkgraph_cv_dlsym_adds_uscore=yes
AC_DEFINE(DLSYM_ADDS_USCORE) ], gtkgraph_cv_dlsym_adds_uscore=no,
gtkgraph_cv_dlsym_adds_uscore=no))
AC_MSG_RESULT($gtkgraph_cv_dlsym_adds_uscore)
fi
fi
])
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