[Mesa-stable] [PATCH 1/2] glx: Fix build errors with --enable-mangling (v2)

[Kyle Brenneman]

Rearranged the GLX_ALIAS macro in glextensions.h so that it will pick up
the renames from glx_mangle.h.

Fixed the alias attribute for glXGetProcAddress when USE_MGL_NAMESPACE is
defined.

v2: Add a comment clarifying why GLX_ALIAS needs two macros.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=55552
Signed-off-by: Kyle Brenneman <kbrenneman at nvidia.com>
Cc: "10.6 11.0" <mesa-stable at lists.freedesktop.org>
---
 src/glx/glxcmds.c       |  4 ++++
 src/glx/glxextensions.h | 10 ++++++++--
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/src/glx/glxcmds.c b/src/glx/glxcmds.c
index 26ff804..93e8db5 100644
--- a/src/glx/glxcmds.c
+++ b/src/glx/glxcmds.c
@@ -2646,7 +2646,11 @@ _X_EXPORT void (*glXGetProcAddressARB(const GLubyte * procName)) (void)
  */
 _X_EXPORT void (*glXGetProcAddress(const GLubyte * procName)) (void)
 #if defined(__GNUC__) && !defined(GLX_ALIAS_UNSUPPORTED)
+# if defined(USE_MGL_NAMESPACE)
+   __attribute__ ((alias("mglXGetProcAddressARB")));
+# else
    __attribute__ ((alias("glXGetProcAddressARB")));
+# endif
 #else
 {
    return glXGetProcAddressARB(procName);
diff --git a/src/glx/glxextensions.h b/src/glx/glxextensions.h
index 90b173f..3a9bc82 100644
--- a/src/glx/glxextensions.h
+++ b/src/glx/glxextensions.h
@@ -281,11 +281,17 @@ typedef void (*PFNGLXDISABLEEXTENSIONPROC) (const char *name);
 # define GLX_ALIAS_VOID(real_func, proto_args, args, aliased_func)
 #else
 # if defined(__GNUC__) && !defined(GLX_ALIAS_UNSUPPORTED)
-#  define GLX_ALIAS(return_type, real_func, proto_args, args, aliased_func) \
+/* GLX_ALIAS and GLX_ALIAS_VOID both expand to the macro GLX_ALIAS2. Using the
+ * extra expansion means that the name mangling macros in glx_mangle.h will
+ * apply before stringification, so the alias attribute will have a string like
+ * "mglXFoo" instead of "glXFoo". */
+#  define GLX_ALIAS2(return_type, real_func, proto_args, args, aliased_func) \
    return_type  real_func  proto_args                                   \
    __attribute__ ((alias( # aliased_func ) ));
+#  define GLX_ALIAS(return_type, real_func, proto_args, args, aliased_func) \
+   GLX_ALIAS2(return_type, real_func, proto_args, args, aliased_func)
 #  define GLX_ALIAS_VOID(real_func, proto_args, args, aliased_func) \
-   GLX_ALIAS(void, real_func, proto_args, args, aliased_func)
+   GLX_ALIAS2(void, real_func, proto_args, args, aliased_func)
 # else
 #  define GLX_ALIAS(return_type, real_func, proto_args, args, aliased_func) \
    return_type  real_func  proto_args                                   \
-- 
1.9.1