[PATCH v2 0/1] MR3984: configure: Don't link with -Wl,-z,defs on FreeBSD.

[Brendan Shanks (＠bshanks)]

On FreeBSD, using `environ` in a shared library linked with `-Wl,-z,defs` causes an undefined reference error:
```
gcc -m64 -o dlls/msv1_0/msv1_0.so -shared -Wl,-Bsymbolic -Wl,-soname,msv1_0.so -Wl,-z,defs dlls/msv1_0/unixlib.o  dlls/ntdll/ntdll.so 
/usr/local/bin/ld: dlls/msv1_0/unixlib.o: in function `ntlm_fork':
/usr/home/pip/wine/build64/../dlls/msv1_0/unixlib.c:206: undefined reference to `environ'
collect2: error: ld returned 1 exit status
*** Error code 1
```

This is unfortunately a common issue on FreeBSD, see:
- https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263265
- https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265008
- https://reviews.freebsd.org/D30842

Reported by Gerald Pfeifer.

--
  v2: configure: Don't link with -Wl,-z,defs on FreeBSD.

https://gitlab.winehq.org/wine/wine/-/merge_requests/3984

[PATCH v2 1/1] configure: Don't link with -Wl,-z,defs on FreeBSD.

[Brendan Shanks]

From: Brendan Shanks

Fixes undefined reference link error in msv1_0.

Reported by Gerald Pfeifer.
---
 configure.ac | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 7229e25dbed..a6666280307 100644
--- a/configure.ac
+++ b/configure.ac
@@ -765,7 +765,14 @@ case $host_os in
         LDDLLFLAGS="-fPIC" ;;
     esac

-    WINE_TRY_CFLAGS([-Wl,-z,defs],[UNIXLDFLAGS="$UNIXLDFLAGS -Wl,-z,defs"])
+    dnl Don't use -Wl,-z,defs on FreeBSD, it prevents 'environ' from being used in shared libraries
+    case $host_os in
+      freebsd*)
+        ;;
+      *)
+        WINE_TRY_CFLAGS([-Wl,-z,defs],[UNIXLDFLAGS="$UNIXLDFLAGS -Wl,-z,defs"]) ;;
+    esac
+
     WINE_TRY_CFLAGS([-Wl,--export-dynamic],[WINELOADER_LDFLAGS="-Wl,--export-dynamic"])
     WINEPRELOADER_LDFLAGS="-nostartfiles -nodefaultlibs"

[Alexandre Julliard (＠julliard)]

I was hoping for a check of the actual failing code, in case other systems inherited the bug. It would also let us do the right thing when/if FreeBSD fixes it.