configure.ac: always define __STDC_CONSTANT_MACROS

The ISO C99 standard (7.18.4) specifies that C++
implementations should define UINT64_C only when
__STDC_CONSTANT_MACROS is defined.

Because we now use UINT64_C in our cpp files (since commit
208bfc493d), we need to add this define.

This also solves compilation errors with GCC 4.8.x on ppc64le machines.

v2: add this define to SCons build system

Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
Reviewed-by: Jose Fonseca <jfonseca@vmware.com>

configure.ac

@@ -245,7 +245,7 @@ _SAVE_LDFLAGS="$LDFLAGS"
 _SAVE_CPPFLAGS="$CPPFLAGS"
 
 dnl Compiler macros
-DEFINES="-D__STDC_LIMIT_MACROS"
+DEFINES="-D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS"
 AC_SUBST([DEFINES])
 case "$host_os" in
 linux*|*-gnu*|gnu*)

scons/gallium.py

@@ -300,7 +300,7 @@ def generate(env):
 
     # C preprocessor options
     cppdefines = []
-    cppdefines += ['__STDC_LIMIT_MACROS']
+    cppdefines += ['__STDC_LIMIT_MACROS', '__STDC_CONSTANT_MACROS']
     if env['build'] in ('debug', 'checked'):
         cppdefines += ['DEBUG']
     else: