From 2f712c7456869d4edbdc13c993dcdb00e7b5ccb2 Mon Sep 17 00:00:00 2001
From: Max Bruckner <max@maxbruckner.de>
Date: Tue, 7 Feb 2017 16:43:13 +0100
Subject: [PATCH] CMake: Fix compile flag detection on old CMake

---
 CMakeLists.txt | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1cee4b7..226ac45 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -33,7 +33,6 @@ if (ENABLE_CUSTOM_COMPILER_FLAGS)
         -Wmissing-prototypes
         -Wstrict-overflow=2
         -Wcast-qual
-        -Wc++-compat
         -Wundef
         -Wswitch-default
         -Wconversion
@@ -41,6 +40,14 @@ if (ENABLE_CUSTOM_COMPILER_FLAGS)
         )
 endif()
 
+# "I am starting to hate CMake" - FSMaxB
+# In older versions of CMake, testing for -Wc++-compat
+# fails because it cannot compile a regular expression
+# This seems to be a bug in the CheckCSourceCompiles module
+if (NOT (CMAKE_MAJOR_VERSION EQUAL 2))
+    list(APPEND custom_compiler_flags "-Wc++-compat")
+endif()
+
 # apply custom compiler flags
 foreach(compiler_flag ${custom_compiler_flags})
     CHECK_C_COMPILER_FLAG(${compiler_flag} "FLAG_SUPPORTED-${compiler_flag}")
-- 
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