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* libltdl/configure.in (libltdl_cv_need_uscore): do not assume

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dlfcn.h and LTDL_LAZY exist; use LTDL_GLOBAL and LTDL_LAZY_OR_NOW.
This test is likely to fail if self-dlopening does not work,
especially because we do not link the program with
-export-dynamic.  Let's just hope that platforms whose symbol
names start with underscores will also accept underscores for
dlopen.  We should probably use libtool to compile and link this
test, so that we can use -export-dynamic.
This commit is contained in:
Alexandre Oliva 1999-03-11 00:58:19 +00:00 committed by Alexandre Oliva
parent b0dc971f4d
commit 477712665e
2 changed files with 48 additions and 3 deletions
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9
ChangeLog
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@ -1,5 +1,14 @@
1999-03-10 Alexandre Oliva <oliva@dcc.unicamp.br>
* libltdl/configure.in (libltdl_cv_need_uscore): do not assume
dlfcn.h and LTDL_LAZY exist; use LTDL_GLOBAL and LTDL_LAZY_OR_NOW.
This test is likely to fail if self-dlopening does not work,
especially because we do not link the program with
-export-dynamic. Let's just hope that platforms whose symbol
names start with underscores will also accept underscores for
dlopen. We should probably use libtool to compile and link this
test, so that we can use -export-dynamic.
* mdemo/Makefile.am (@LIBLTDL@): depend on ../libltdl/config.h
* configure.in: fix AC_OUTPUT_COMMANDS for ltconfig and ltmain.sh

42
libltdl/configure.in
View File

@ -143,14 +143,50 @@ if test x"$USE_SYMBOL_UNDERSCORE" = xyes; then
AC_CACHE_CHECK([whether we have to add an underscore for dlsym],
libltdl_cv_need_uscore, [dnl
AC_TRY_RUN([
#if HAVE_DLFCN_H
#include <dlfcn.h>
#endif
#include <stdio.h>
#ifdef RTLD_GLOBAL
# define LTDL_GLOBAL RTLD_GLOBAL
#else
# ifdef DL_GLOBAL
# define LTDL_GLOBAL DL_GLOBAL
# else
# define LTDL_GLOBAL 0
# endif
#endif
/* We may have to define LTDL_LAZY_OR_NOW in the command line if we
find out it does not work in some platform. */
#ifndef LTDL_LAZY_OR_NOW
# ifdef RTLD_LAZY
# define LTDL_LAZY_OR_NOW RTLD_LAZY
# else
# ifdef DL_LAZY
# define LTDL_LAZY_OR_NOW DL_LAZY
# else
# ifdef RTLD_NOW
# define LTDL_LAZY_OR_NOW RTLD_NOW
# else
# ifdef DL_NOW
# define LTDL_LAZY_OR_NOW DL_NOW
# else
# define LTDL_LAZY_OR_NOW 0
# endif
# endif
# endif
# endif
#endif
fnord() { int i=42;}
main() { void *self, *ptr1, *ptr2; self=dlopen(0,RTLD_LAZY);
main() { void *self, *ptr1, *ptr2; self=dlopen(0,LTDL_GLOBAL|LTDL_LAZY_OR_NOW);
if(self) { ptr1=dlsym(self,"fnord"); ptr2=dlsym(self,"_fnord");
if(ptr1 && !ptr2) exit(0); } exit(1); }
if(ptr1 && !ptr2) exit(0); } exit(1); }
], libltdl_cv_need_uscore=no, libltdl_cv_need_uscore=yes,
libltdl_cv_need_uscore=no
libltdl_cv_need_uscore=cross
)])
fi
fi