From a653e27a2e949bb62041509c2aab9787b3fbd480 Mon Sep 17 00:00:00 2001
From: Aris Adamantiadis <aris@0xbadc0de.be>
Date: Sun, 8 Feb 2015 18:49:02 +0100
Subject: buffer: detect compilers not supporting __VA_ARGS__

---
 ConfigureChecks.cmake | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'ConfigureChecks.cmake')

diff --git a/ConfigureChecks.cmake b/ConfigureChecks.cmake
index 5f570c3c..13a0f4dc 100644
--- a/ConfigureChecks.cmake
+++ b/ConfigureChecks.cmake
@@ -203,6 +203,18 @@ int main(void)
     return 0;
 }" HAVE_GCC_VOLATILE_MEMORY_PROTECTION)
 
+check_c_source_compiles("
+#include <stdio.h>
+#define __VA_NARG__(...) (__VA_NARG_(_0, ## __VA_ARGS__, __RSEQ_N()) - 1)
+#define __VA_NARG_(...) __VA_ARG_N(__VA_ARGS__)
+#define __VA_ARG_N( _1, _2, _3, _4, _5, _6, _7, _8, _9,_10,N,...) N
+#define __RSEQ_N() 10, 9,  8,  7,  6,  5,  4,  3,  2,  1,  0
+#define myprintf(format, ...) printf((format), __VA_NARG__(__VA_ARGS__), __VA_ARGS__)
+int main(void) {
+    myprintf(\"%d %d %d %d\",1,2,3);
+    return 0;
+}" HAVE_GCC_NARG_MACRO)
+
 if (WITH_DEBUG_CRYPTO)
   set(DEBUG_CRYPTO 1)
 endif (WITH_DEBUG_CRYPTO)
-- 
cgit v1.2.3