From eb49c62b6ba3edc84c54ca7e3083a7b3c907c0a8 Mon Sep 17 00:00:00 2001
From: sleske <sleske@ffa7fe5e-494d-0410-b361-a75ebd5db220>
Date: Wed, 10 Sep 2014 22:36:02 +0000
Subject: Fix:build:Check if compiler options are supported before using
 them.|Allows building with GCC 3.3, to resolve #1144.

git-svn-id: http://svn.code.sf.net/p/navit/code/trunk/navit@5892 ffa7fe5e-494d-0410-b361-a75ebd5db220
---
 cmake/navit_macros.cmake | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'cmake')

diff --git a/cmake/navit_macros.cmake b/cmake/navit_macros.cmake
index de5ecb2f4..dd1b3bb37 100644
--- a/cmake/navit_macros.cmake
+++ b/cmake/navit_macros.cmake
@@ -86,3 +86,20 @@ macro(message_error)
    set(NAVIT_DEPENDENCY_ERROR 1)
    message( SEND_ERROR ${ARGN})
 endmacro(message_error)
+
+include(CheckCCompilerFlag)
+include(CheckCXXCompilerFlag)
+function(add_compiler_flag_if_available FLAG)
+   set(VAR_FLAG_AVAILABLE_C "FLAG_AVAILABLE_C_${FLAG}")
+   check_c_compiler_flag(${FLAG} ${VAR_FLAG_AVAILABLE_C})
+   if (${${VAR_FLAG_AVAILABLE_C}})
+      set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${FLAG} ")
+   endif()
+   if(CMAKE_CXX_COMPILER) # C++ compiler is optional
+      set(VAR_FLAG_AVAILABLE_CXX "FLAG_AVAILABLE_CXX_${FLAG}")
+      check_cxx_compiler_flag(${FLAG} ${VAR_FLAG_AVAILABLE_CXX})
+      if (${${VAR_FLAG_AVAILABLE_CXX}})
+	 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${FLAG} ")
+      endif()
+   endif()
+endfunction(add_compiler_flag_if_available)
-- 
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