mesa: Replace a priori knowledge of gcc attributes with configure tests.
Note that I had to add support for testing the packed attribute to
m4/ax_gcc_func_attribute.m4.
Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com> [C bits]
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
diff --git a/configure.ac b/configure.ac
index db134a2..13b339e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -140,6 +140,10 @@
AX_GCC_BUILTIN([__builtin_popcountll])
AX_GCC_BUILTIN([__builtin_unreachable])
+AX_GCC_FUNC_ATTRIBUTE([flatten])
+AX_GCC_FUNC_ATTRIBUTE([format])
+AX_GCC_FUNC_ATTRIBUTE([packed])
+
AM_CONDITIONAL([GEN_ASM_OFFSETS], test "x$GEN_ASM_OFFSETS" = xyes)
dnl Make sure the pkg-config macros are defined