[PATCH v3 1/1] configure: Don't use -Wl,-z,defs if causes link errors with 'environ'.

[Brendan Shanks]

From: Brendan Shanks

Fixes undefined reference link error in msv1_0 on FreeBSD.

Reported by Gerald Pfeifer.
---
 configure.ac | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 7229e25dbed..567e11e7bf2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -765,7 +765,19 @@ case $host_os in
         LDDLLFLAGS="-fPIC" ;;
     esac

-    WINE_TRY_CFLAGS([-Wl,-z,defs],[UNIXLDFLAGS="$UNIXLDFLAGS -Wl,-z,defs"])
+    dnl On FreeBSD, shared libraries using environ fail to link with -Wl,-z,defs
+    WINE_TRY_CFLAGS([-Wl,-z,defs],
+                    [AC_CACHE_CHECK([whether -Wl,-z,defs can be used with environ], ac_cv_wl_z_defs_environ,
+                                    [ac_save_CFLAGS="$CFLAGS"
+                                     CFLAGS="$CFLAGS $UNIXDLLFLAGS $UNIXLDFLAGS -Wl,-z,defs"
+                                     AC_LINK_IFELSE([AC_LANG_SOURCE([[extern char **environ; char **envp; void myfunc(void) { envp = environ; }]])],
+                                                    [ac_cv_wl_z_defs_environ=yes],[ac_cv_wl_z_defs_environ=no])
+                                     CFLAGS=$ac_save_cflags])
+                     if test $ac_cv_wl_z_defs_environ = yes
+                     then
+                       UNIXLDFLAGS="$UNIXLDFLAGS -Wl,-z,defs"
+                     fi])
+
     WINE_TRY_CFLAGS([-Wl,--export-dynamic],[WINELOADER_LDFLAGS="-Wl,--export-dynamic"])
     WINEPRELOADER_LDFLAGS="-nostartfiles -nodefaultlibs"