refs #4871 make all compiler flag changes prepends so that user-specified...

refs #4871 make all compiler flag changes prepends so that user-specified flags (-D CMAKE_CXX_FLAGS="-foo") will take precedence


git-svn-id: file:///svn/toku/tokudb@48354 c7de825b-a66e-492c-adef-691d508d4ae1

cmake_modules/TokuSetupCompiler.cmake

@@ -43,11 +43,11 @@ include(CheckCXXCompilerFlag)
 macro(set_cflags_if_supported_named flag flagname)
   check_c_compiler_flag("${flag}" HAVE_C_${flagname})
   if (HAVE_C_${flagname})
-    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}")
+    set(CMAKE_C_FLAGS "${flag} ${CMAKE_C_FLAGS}")
   endif ()
   check_cxx_compiler_flag("${flag}" HAVE_CXX_${flagname})
   if (HAVE_CXX_${flagname})
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}")
+    set(CMAKE_CXX_FLAGS "${flag} ${CMAKE_CXX_FLAGS}")
   endif ()
 endmacro(set_cflags_if_supported_named)
 
@@ -56,11 +56,11 @@ macro(set_cflags_if_supported)
   foreach(flag ${ARGN})
     check_c_compiler_flag(${flag} HAVE_C_${flag})
     if (HAVE_C_${flag})
-      set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}")
+      set(CMAKE_C_FLAGS "${flag} ${CMAKE_C_FLAGS}")
     endif ()
     check_cxx_compiler_flag(${flag} HAVE_CXX_${flag})
     if (HAVE_CXX_${flag})
-      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}")
+      set(CMAKE_CXX_FLAGS "${flag} ${CMAKE_CXX_FLAGS}")
     endif ()
   endforeach(flag)
 endmacro(set_cflags_if_supported)
@@ -70,8 +70,8 @@ macro(set_ldflags_if_supported)
   foreach(flag ${ARGN})
     check_cxx_compiler_flag(${flag} HAVE_${flag})
     if (HAVE_${flag})
-      set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${flag}")
-      set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${flag}")
+      set(CMAKE_EXE_LINKER_FLAGS "${flag} ${CMAKE_EXE_LINKER_FLAGS}")
+      set(CMAKE_SHARED_LINKER_FLAGS "${flag} ${CMAKE_SHARED_LINKER_FLAGS}")
     endif ()
   endforeach(flag)
 endmacro(set_ldflags_if_supported)
@@ -118,8 +118,8 @@ else ()
   # we overwrite this because the default passes -DNDEBUG and we don't want that
   set(CMAKE_C_FLAGS_RELEASE "-g -O3 -flto -fuse-linker-plugin")
   set(CMAKE_CXX_FLAGS_RELEASE "-g -O3 -flto -fuse-linker-plugin")
-  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -g -fuse-linker-plugin")
-  set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -g -fuse-linker-plugin")
+  set(CMAKE_EXE_LINKER_FLAGS "-g -fuse-linker-plugin ${CMAKE_EXE_LINKER_FLAGS}")
+  set(CMAKE_SHARED_LINKER_FLAGS "-g -fuse-linker-plugin ${CMAKE_SHARED_LINKER_FLAGS}")
 endif ()
 
 option(USE_VALGRIND "Do not pass NVALGRIND to the compiler, because valgrind will be run on the generated executables." ON)