Mesa (master): Add macro for unused function attribute.

[Vinson Lee]

Module: Mesa
Branch: master
Commit: 5f759836ad75360a2f4581083043a86f7a8c1e09
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=5f759836ad75360a2f4581083043a86f7a8c1e09

Author: Vinson Lee <vlee at freedesktop.org>
Date:   Sat Mar  7 14:07:10 2015 -0800

Add macro for unused function attribute.

Suggested-by: Emil Velikov <emil.l.velikov at gmail.com>
Signed-off-by: Vinson Lee <vlee at freedesktop.org>
Reviewed-by: Emil Velikov <emil.l.velikov at gmail.com>

---

 configure.ac      |    1 +
 scons/gallium.py  |    1 +
 src/util/macros.h |    6 ++++++
 3 files changed, 8 insertions(+)

diff --git a/configure.ac b/configure.ac
index 90c7737..2954f80 100644
--- a/configure.ac
+++ b/configure.ac
@@ -195,6 +195,7 @@ AX_GCC_FUNC_ATTRIBUTE([flatten])
 AX_GCC_FUNC_ATTRIBUTE([format])
 AX_GCC_FUNC_ATTRIBUTE([malloc])
 AX_GCC_FUNC_ATTRIBUTE([packed])
+AX_GCC_FUNC_ATTRIBUTE([unused])
 
 AM_CONDITIONAL([GEN_ASM_OFFSETS], test "x$GEN_ASM_OFFSETS" = xyes)
 
diff --git a/scons/gallium.py b/scons/gallium.py
index 7533f06..b162089 100755
--- a/scons/gallium.py
+++ b/scons/gallium.py
@@ -369,6 +369,7 @@ def generate(env):
             'HAVE___BUILTIN_FFS',
             'HAVE___BUILTIN_FFSLL',
             'HAVE_FUNC_ATTRIBUTE_FLATTEN',
+            'HAVE_FUNC_ATTRIBUTE_UNUSED',
             # GCC 3.0
             'HAVE_FUNC_ATTRIBUTE_FORMAT',
             'HAVE_FUNC_ATTRIBUTE_PACKED',
diff --git a/src/util/macros.h b/src/util/macros.h
index 63daba3..6c7bda7 100644
--- a/src/util/macros.h
+++ b/src/util/macros.h
@@ -176,5 +176,11 @@ do {                       \
 #  endif
 #endif
 
+#ifdef HAVE_FUNC_ATTRIBUTE_UNUSED
+#define UNUSED __attribute__((unused))
+#else
+#define UNUSED
+#endif
+
 
 #endif /* UTIL_MACROS_H */