From 627326bed4e58cf457e8c8f2c45b2e6d7c316a54 Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Sun, 16 Nov 2014 16:10:45 +0100
Subject: Feature test for __builtin_expect

---
 src/CMakeLists.txt | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

(limited to 'src/CMakeLists.txt')

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 4b13dd7..691e268 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -93,8 +93,13 @@ install(FILES cmark.h ${CMAKE_CURRENT_BINARY_DIR}/cmark_export.h
   DESTINATION include
   )
 
-include (CheckIncludeFile)
-CHECK_INCLUDE_FILE (stdbool.h HAVE_STDBOOL_H)
+# Feature tests
+include(CheckIncludeFile)
+include(CheckCSourceCompiles)
+CHECK_INCLUDE_FILE(stdbool.h HAVE_STDBOOL_H)
+CHECK_C_SOURCE_COMPILES(
+  "int main() { __builtin_expect(0,0); return 0; }"
+  HAVE___BUILTIN_EXPECT)
 
 CONFIGURE_FILE(
   ${CMAKE_CURRENT_SOURCE_DIR}/config.h.in
-- 
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