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?RCS: $Id: d_dlsymun.U,v $
?RCS:
?RCS: $Log: d_dlsymun.U,v $
?RCS:
?MAKE:d_dlsymun: cat cc ccflags ldflags rm Setvar dlsrc i_dlfcn \
cccdlflags ccdlflags lddlflags libs dlext
?MAKE: -pick add $@ %<
?X: This is specific to perl5.
?S:d_dlsymun:
?S: This variable conditionally defines DLSYM_NEEDS_UNDERSCORE, which
?S: indicates that we need to prepend an underscore to the symbol
?S: name before calling dlsym().
?S:.
?C:DLSYM_NEEDS_UNDERSCORE:
?C: This symbol, if defined, indicates that we need to prepend an
?C: underscore to the symbol name before calling dlsym(). This only
?C: makes sense if you *have* dlsym, which we will presume is the
?C: case if you're using dl_dlopen.xs.
?C:.
?H:#$d_dlsymun DLSYM_NEEDS_UNDERSCORE /* */
?H:.
?F: !fred
?LINT:set d_dlsymun
?T: xxx
: Check if dlsym need a leading underscore
echo " "
val="$undef"
case "$dlsrc" in
dl_dlopen.xs)
echo "Checking whether your dlsym() needs a leading underscore ..." >&4
$cat >dyna.c <<'EOM'
fred () { }
EOM
$cat >fred.c<<EOM
#include <stdio.h>
#$i_dlfcn I_DLFCN
#ifdef I_DLFCN
#include <dlfcn.h> /* the dynamic linker include file for Sunos/Solaris */
#else
#include <sys/types.h>
#include <nlist.h>
#include <link.h>
#endif
extern int fred() ;
main()
{
void * handle ;
void * symbol ;
#ifndef RTLD_LAZY
int mode = 1 ;
#else
int mode = RTLD_LAZY ;
#endif
handle = dlopen("./dyna.$dlext", mode) ;
if (handle == NULL) {
printf ("1\n") ;
exit(0);
}
symbol = dlsym(handle, "fred") ;
if (symbol == NULL) {
/* try putting a leading underscore */
symbol = dlsym(handle, "_fred") ;
if (symbol == NULL) {
printf ("2\n") ;
exit(0);
}
printf ("3\n") ;
}
else
printf ("4\n") ;
exit(0);
}
EOM
if $cc $ccflags $cccdlflags -c dyna.c > /dev/null 2>&1 &&
ld $lddlflags -o dyna.$dlext dyna.o > /dev/null 2>&1 &&
$cc $ccflags $ldflags $cccdlflags $ccdlflags fred.c -o fred $libs > /dev/null 2>&1; then
xxx=`./fred`
case $xxx in
1) echo "Test program failed using dlopen." >&4
echo "Perhaps you should not use dynamic loading." >&4;;
2) echo "Test program failed using dlsym." >&4
echo "Perhaps you should not use dynamic loading." >&4;;
3) echo "dlsym needs a leading underscore" >&4
val="$define" ;;
4) echo "dlsym doesn't need a leading underscore." >&4;;
esac
else
echo "I can't compile and run the test program." >&4
fi
;;
esac
$rm -f fred fred.? dyna.$dlext dyna.?
set d_dlsymun
eval $setvar
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