[Buildroot] [PATCH] xserver_xorg-server: disable libunwind on MIPS with 32-bit pointers

[Vicente Olivert Riera]

libunwind support in xorg-server is not only broken for MIPS64 n32 but
for all MIPS variants with 32-bit pointers. The reason is exactly the
same one. libunwind defines a uint64 variable to store the words. Then,
xorg-server casts that variable (64-bit) into a pointer (32-bit), and
the compilation fails:

backtrace.c:98:13: error: cast to pointer from integer of different size
[-Werror=int-to-pointer-cast]

Related:
  https://bugs.freedesktop.org/show_bug.cgi?id=79939

Fixes:
  http://autobuild.buildroot.net/results/87b/87be2c95957f9925c1258812e536df72689fc5da/

Signed-off-by: Vicente Olivert Riera <Vincent.Riera at imgtec.com>
---
 .../xserver_xorg-server/xserver_xorg-server.mk     |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/package/x11r7/xserver_xorg-server/xserver_xorg-server.mk b/package/x11r7/xserver_xorg-server/xserver_xorg-server.mk
index 4164ccf..91b4f03 100644
--- a/package/x11r7/xserver_xorg-server/xserver_xorg-server.mk
+++ b/package/x11r7/xserver_xorg-server/xserver_xorg-server.mk
@@ -144,10 +144,11 @@ ifeq ($(BR2_PACKAGE_FREETYPE),y)
 XSERVER_XORG_SERVER_DEPENDENCIES += freetype
 endif
 
-# libunwind support is broken on MIPS64 n32
+# libunwind support is broken on all MIPS variants with 32-bit pointers
 # https://bugs.freedesktop.org/show_bug.cgi?id=79939
-ifeq ($(BR2_PACKAGE_LIBUNWIND)-$(BR2_MIPS_NABI32),y-)
+ifeq ($(BR2_PACKAGE_LIBUNWIND)-$(BR2_MIPS_OABI32)-$(BR2_MIPS_NABI32),y--)
 XSERVER_XORG_SERVER_DEPENDENCIES += libunwind
+XSERVER_XORG_SERVER_CONF_OPTS += --enable-libunwind
 else
 XSERVER_XORG_SERVER_CONF_OPTS += --disable-libunwind
 endif
-- 
1.7.1