[PATCH]: Fix GLX crashes on RISC cpus.

[David Miller]

This is a refresh of a bug fix patch that has been rotting
in freedesktop bugzilla for more than a year.

The short story is that during the conversion over to modular, the
__GLX_ALIGN64 CPP define (as well as the necessary -mieee compiler
option for Alpha) no longer gets set where it needs to, resulting in
SIGBUS exceptions (and math accuracy problems on Alpha) for GL
applications.

The original patch author is Jurij Smakov <jurij at wooyd.org>

Please apply to the xorg GIT tree, thanks!

[GL]: Add GLX compile flags lost in modular X server changes.

RISC chips that trap on unaligned loads and stores need to
define __GLX_ALIGN64.  This used to get added to the cflags
in the old *.cf files but it no longer does in the modular
X server.

Also, Alpha needs to pass -mieee to the compiler as well.

This is a simple backport of a patch that debian, and probably other
distributions, have been applying forever.  To the best of my
knowledge the patch was written by Jurij Smakov.  See debian bug
number #388125.

I just checked and this has been rotting for more than a year in
freedesktop bugzilla as #8392.

Signed-off-by: David S. Miller <davem at davemloft.net>
---
 GL/glx/Makefile.am          |    3 ++-
 configure.ac                |   10 ++++++++++
 hw/dmx/glxProxy/Makefile.am |    1 +
 3 files changed, 13 insertions(+), 1 deletions(-)

diff --git a/GL/glx/Makefile.am b/GL/glx/Makefile.am
index 8eda153..4cf56e8 100644
--- a/GL/glx/Makefile.am
+++ b/GL/glx/Makefile.am
@@ -14,7 +14,8 @@ AM_CFLAGS = \
 	-I at MESA_SOURCE@/src/mesa/glapi \
 	-I at MESA_SOURCE@/src/mesa/main \
 	-DXFree86Server \
-	@GLX_DEFINES@
+	@GLX_DEFINES@ \
+	@GLX_ARCH_DEFINES@
 
 # none yet
 #sdk_HEADERS =
diff --git a/configure.ac b/configure.ac
index 0b718c9..0742040 100644
--- a/configure.ac
+++ b/configure.ac
@@ -304,6 +304,7 @@ case $host_cpu in
 	        *freebsd*)	SYS_LIBS=-lio ;;
 		*netbsd*)	AC_DEFINE(USE_ALPHA_PIO, 1, [NetBSD PIO alpha IO]) ;;
 	esac
+	GLX_ARCH_DEFINES="-D__GLX_ALIGN64 -mieee"
 	;;
   arm*)
 	ARM_VIDEO=yes
@@ -333,6 +334,7 @@ case $host_cpu in
 	xorg_loader_sparcmuldiv="yes"
 	SPARC64_VIDEO=yes
 	BSD_ARCH_SOURCES="sparc64_video.c ioperm_noop.c"
+	GLX_ARCH_DEFINES="-D__GLX_ALIGN64"
 	;;
   x86_64*|amd64*)
   	use_x86_asm="yes"
@@ -347,8 +349,16 @@ case $host_cpu in
 				SYS_LIBS=-lamd64
 				;;
 	esac
+	GLX_ARCH_DEFINES="-D__GLX_ALIGN64"
+	;;
+  ia64*)
+  	GLX_ARCH_DEFINES="-D__GLX_ALIGN64"
+	;;
+  s390*)
+  	GLX_ARCH_DEFINES="-D__GLX_ALIGN64"
 	;;
 esac
+AC_SUBST(GLX_ARCH_DEFINES)
 
 dnl BSD *_video.c selection
 AM_CONDITIONAL(ALPHA_VIDEO, [test "x$ALPHA_VIDEO" = xyes])
diff --git a/hw/dmx/glxProxy/Makefile.am b/hw/dmx/glxProxy/Makefile.am
index 1fbc8d7..f995498 100644
--- a/hw/dmx/glxProxy/Makefile.am
+++ b/hw/dmx/glxProxy/Makefile.am
@@ -32,6 +32,7 @@ libglxproxy_a_SOURCES = compsize.c \
                         unpack.h
 
 AM_CFLAGS = \
+            @GLX_ARCH_DEFINES@ \
             $(DIX_CFLAGS) \
             -I$(top_srcdir)/hw/dmx \
             -I$(top_srcdir)/include \
-- 
1.5.4.rc1.23.g3a969