From 04d5f4805a86302a0e135a28d58a6c1ff6a68d52 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andreas=20M=C3=BCller?= <schnitzeltony@gmail.com>
Date: Thu, 30 Jul 2020 23:03:51 +0200
Subject: [PATCH] Use compiler -fcf-protection only if compiler/arch supports
 it
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There have been some PRs they were either rejected or some general suggestion
for more flags suggested. So

Upstream-Status: Pending

Signed-off-by: Andreas Müller <schnitzeltony@gmail.com>
---
 cmake/compilerFlags.cmake | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/cmake/compilerFlags.cmake b/cmake/compilerFlags.cmake
index 12caf42..455525e 100644
--- a/cmake/compilerFlags.cmake
+++ b/cmake/compilerFlags.cmake
@@ -26,7 +26,12 @@ if ( MINGW OR UNIX OR MSYS ) # MINGW, Linux, APPLE, CYGWIN
         # This fails under Fedora, MinGW GCC 8.3.0 and CYGWIN/MSYS 9.3.0
         if (NOT (MINGW OR CMAKE_HOST_SOLARIS OR CYGWIN OR MSYS) )
             if (COMPILER_IS_GCC AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 8.0)
-                add_compile_options(-fstack-clash-protection -fcf-protection)
+                # Gcc does support -fcf-protection on few arches only
+                CHECK_CXX_COMPILER_FLAG(-fcf-protection COMPILER_SUPPORTS_FCF_PROTECTION)
+                if (COMPILER_SUPPORTS_FCF_PROTECTION)
+                    add_compile_options(-fcf-protection)
+                endif()
+                add_compile_options(-fstack-clash-protection)
             endif()
 
             if( (COMPILER_IS_GCC   AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 5.0) # Not in GCC 4.8
-- 
2.21.3