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PATCH RFA: Do not require dlopen to be in -ldl
- From: Ian Lance Taylor <iant at google dot com>
- To: gcc-patches at gcc dot gnu dot org
- Date: Thu, 08 Oct 2009 16:07:51 -0700
- Subject: PATCH RFA: Do not require dlopen to be in -ldl
I am told that on FreeBSD dlopen is libc, not libdl. This patch has
been confirmed to permit plugins to work on FreeBSD. I have
bootstrapped it on i686-pc-linux-gnu and confirmed that the plugin.exp
tests all pass.
OK for mainline?
Ian
2009-10-08 Ian Lance Taylor <iant@google.com>
* configure.ac: Test for dlopen separately from testing for -ldl.
* configure: Rebuild.
Index: configure.ac
===================================================================
--- configure.ac (revision 152544)
+++ configure.ac (working copy)
@@ -4253,16 +4253,13 @@ if test x"$enable_plugin" = x"yes"; then
fi
# Check -ldl
- LIBS="$LIBS -ldl"
AC_MSG_CHECKING([for -ldl])
- AC_TRY_LINK(
- [#include <dlfcn.h>],
- [volatile int f = 0; if (f) dlopen ("dummy", 0);],
- [AC_MSG_RESULT([yes]); have_dl=yes],
- [AC_MSG_RESULT([no])])
- if test x"$have_dl" = x"yes"; then
+ AC_CHECK_LIB(dl, dlopen, found_dl=yes, found_dl=no)
+ if test x"$found_dl" = x"yes"; then
+ LIBS="$LIBS -ldl"
pluginlibs="$pluginlibs -ldl"
fi
+ AC_CHECK_FUNC(dlopen, found_dlopen=yes, found_dlopen=no)
# Check that we can build shared objects with -fPIC -shared
LDFLAGS="$LDFLAGS -fPIC -shared"
@@ -4271,7 +4268,7 @@ if test x"$enable_plugin" = x"yes"; then
[extern int X;],[return X == 0;],
[AC_MSG_RESULT([yes]); have_pic_shared=yes],
[AC_MSG_RESULT([no]); have_pic_shared=no])
- if test x"$have_pic_shared" != x"yes"; then
+ if test x"$have_pic_shared" != x"yes" -o x"$found_dlopen" != x"yes"; then
pluginlibs=
enable_plugin=no
fi