From cfa702b278c126ed3e5d0d34aa7ca018504edb96 Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Sun, 16 Nov 2014 17:46:12 +0100
Subject: Feature test for GCC attributes

---
 src/CMakeLists.txt | 4 ++++
 src/buffer.h       | 2 +-
 src/config.h.in    | 8 ++++++++
 3 files changed, 13 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index c5814e0..c399713 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -99,6 +99,10 @@ CHECK_INCLUDE_FILE(stdbool.h HAVE_STDBOOL_H)
 CHECK_C_SOURCE_COMPILES(
   "int main() { __builtin_expect(0,0); return 0; }"
   HAVE___BUILTIN_EXPECT)
+CHECK_C_SOURCE_COMPILES("
+  int f(void) __attribute__ (());
+  int main() { return 0; }
+" HAVE___ATTRIBUTE__)
 
 CONFIGURE_FILE(
   ${CMAKE_CURRENT_SOURCE_DIR}/config.h.in
diff --git a/src/buffer.h b/src/buffer.h
index d14b38e..acbead7 100644
--- a/src/buffer.h
+++ b/src/buffer.h
@@ -110,7 +110,7 @@ CMARK_EXPORT
 int cmark_strbuf_puts(cmark_strbuf *buf, const char *string);
 CMARK_EXPORT
 int cmark_strbuf_printf(cmark_strbuf *buf, const char *format, ...)
-	__attribute__((format (printf, 2, 3)));
+	CMARK_ATTRIBUTE((format (printf, 2, 3)));
 CMARK_EXPORT
 int cmark_strbuf_vprintf(cmark_strbuf *buf, const char *format, va_list ap);
 CMARK_EXPORT
diff --git a/src/config.h.in b/src/config.h.in
index bd39c4e..5294bc9 100644
--- a/src/config.h.in
+++ b/src/config.h.in
@@ -7,3 +7,11 @@
 #endif
 
 #cmakedefine HAVE___BUILTIN_EXPECT
+
+#cmakedefine HAVE___ATTRIBUTE__
+
+#ifdef HAVE___ATTRIBUTE__
+  #define CMARK_ATTRIBUTE(list) __attribute__ (list)
+#else
+  #define CMARK_ATTRIBUTE(list)
+#endif
-- 
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