From bcd75a538ec459285ffa538498ed36a7b41a8d44 Mon Sep 17 00:00:00 2001
From: Nicky <sl.nicky.ml@googlemail.com>
Date: Mon, 16 Jan 2017 15:54:24 +0100
Subject: [PATCH] Workaround for distributions who already define
 _FORTIFY_SOURCE by default (eg Gentoo) and do not redefine it then.

---
 indra/cmake/00-Common.cmake | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/indra/cmake/00-Common.cmake b/indra/cmake/00-Common.cmake
index 89c34fa114..edc4b3286a 100644
--- a/indra/cmake/00-Common.cmake
+++ b/indra/cmake/00-Common.cmake
@@ -105,7 +105,22 @@ endif (WINDOWS)
 if (LINUX)
   set(CMAKE_SKIP_RPATH TRUE)
 
-  add_definitions(-D_FORTIFY_SOURCE=2)
+  # <FS:ND/>
+  # And another hack for FORTIFY_SOURCE. Some distributions (for example Gentoo) define FORTIFY_SOURCE by default.
+  # Check if this is the case, if yes, do not define it again.
+
+  execute_process(
+      COMMAND echo "int main( char **a, int c ){ \n#ifdef _FORTIFY_SOURCE\n#error FORTITY_SOURCE_SET\n#else\nreturn 0;\n#endif\n}" 
+      COMMAND sh -c "${CMAKE_CXX_COMPILER} ${CMAKE_CXX_COMPILER_ARG1} -xc++ -w - -o /dev/null"
+      OUTPUT_VARIABLE FORTIFY_SOURCE_OUT
+	  ERROR_VARIABLE FORTIFY_SOURCE_ERR
+	  RESULT_VARIABLE FORTIFY_SOURCE_RES
+     )
+
+
+  if ( ${FORTIFY_SOURCE_RES} EQUAL 0 )
+   add_definitions(-D_FORTIFY_SOURCE=2)
+  endif()
 
   set(CMAKE_CXX_FLAGS "-Wno-deprecated -Wno-unused-but-set-variable -Wno-unused-variable ${CMAKE_CXX_FLAGS}")