[Mesa-stable] [PATCH] glsl: simplify the M_PI*f macros, fixes build on OpenBSD

[Jonathan Gray]

The M_PI*f macros used a preprocessor paste to append 'f'
to M_PI defines, which works if the values are only numbers
but breaks on OpenBSD where M_PI definitions have casts
and brackets to meet requirements of a future version of POSIX,

http://austingroupbugs.net/view.php?id=801
http://austingroupbugs.net/view.php?id=828

Simplify the M_PI*f macros by using casts directly in the defines
as suggested by Kenneth Graunke.

Cc: "10.2" <mesa-stable at lists.freedesktop.org>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=78665
Signed-off-by: Jonathan Gray <jsg at jsg.id.au>
---
 src/glsl/builtin_functions.cpp | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/src/glsl/builtin_functions.cpp b/src/glsl/builtin_functions.cpp
index 3991f9d..aeed96e 100644
--- a/src/glsl/builtin_functions.cpp
+++ b/src/glsl/builtin_functions.cpp
@@ -62,11 +62,9 @@
 #include "program/prog_instruction.h"
 #include <limits>
 
-#define f(x) join(x)
-#define join(x) x ## f
-#define M_PIf f(M_PI)
-#define M_PI_2f f(M_PI_2)
-#define M_PI_4f f(M_PI_4)
+#define M_PIf	((float) M_PI)
+#define M_PI_2f	((float) M_PI_2)
+#define M_PI_4f	((float) M_PI_4)
 
 using namespace ir_builder;
 
-- 
1.9.2