From a9a99fb31f2b5b28a321b1637ed491ef0fdc9b2e Mon Sep 17 00:00:00 2001
From: Andreas Schneider <asn@cryptomilk.org>
Date: Mon, 20 Aug 2018 15:17:09 +0200
Subject: cmake: Improve compiler flag detection

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>
---
 cmake/Modules/AddCCompilerFlag.cmake | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 cmake/Modules/AddCCompilerFlag.cmake

(limited to 'cmake')

diff --git a/cmake/Modules/AddCCompilerFlag.cmake b/cmake/Modules/AddCCompilerFlag.cmake
new file mode 100644
index 00000000..3c270722
--- /dev/null
+++ b/cmake/Modules/AddCCompilerFlag.cmake
@@ -0,0 +1,13 @@
+include(CheckCCompilerFlag)
+
+macro(add_c_compiler_flag _COMPILER_FLAG _OUTPUT_VARIABLE)
+    string(TOUPPER ${_COMPILER_FLAG} _COMPILER_FLAG_NAME)
+    string(REGEX REPLACE "^-" "" _COMPILER_FLAG_NAME "${_COMPILER_FLAG_NAME}")
+    string(REGEX REPLACE "(-|=|\ )" "_" _COMPILER_FLAG_NAME "${_COMPILER_FLAG_NAME}")
+
+    check_c_compiler_flag("${_COMPILER_FLAG}" WITH_${_COMPILER_FLAG_NAME}_FLAG)
+    if (WITH_${_COMPILER_FLAG_NAME}_FLAG)
+        #string(APPEND ${_OUTPUT_VARIABLE} "${_COMPILER_FLAG} ")
+        list(APPEND ${_OUTPUT_VARIABLE} ${_COMPILER_FLAG})
+    endif()
+endmacro()
-- 
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