flto has not the right effect with clang

[simgrid.git] / buildtools / Cmake / Flags.cmake

diff --git a/buildtools/Cmake/Flags.cmake b/buildtools/Cmake/Flags.cmake
index 2a2a96f..058ea2d 100644 (file)
--- a/buildtools/Cmake/Flags.cmake
+++ b/buildtools/Cmake/Flags.cmake
@@ -4,29 +4,40 @@ set(optCFLAGS "")
 if(NOT __VISUALC__ AND NOT __BORLANDC__)
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}-g3")
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}-g3")
+  set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -g")
 else()
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}/Zi")
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}/Zi")
 endif()
 
 if(enable_compile_warnings)
-  set(warnCFLAGS "-fno-common -Wall -Wunused -Wmissing-prototypes -Wmissing-declarations -Wpointer-arith -Wchar-subscripts -Wcomment -Wformat -Wwrite-strings -Wclobbered -Wno-unused-function -Wno-unused-parameter -Wno-strict-aliasing -Wno-format-nonliteral -Werror -Wno-error=clobbered ")
-  if(COMPILER_C_VERSION_MAJOR_MINOR STRGREATER "4.5")
-    set(warnCFLAGS "${warnCFLAGS}-Wno-error=unused-but-set-variable ")
-  endif()
-  if(CMAKE_C_COMPILER_ID STREQUAL "Clang")
-    string(REPLACE "-Wclobbered " "" warnCFLAGS "${warnCFLAGS}")
+  set(warnCFLAGS "-fno-common -Wall -Wunused -Wmissing-prototypes -Wmissing-declarations -Wpointer-arith -Wchar-subscripts -Wcomment -Wformat -Wwrite-strings -Wno-unused-function -Wno-unused-parameter -Wno-strict-aliasing -Wno-format-nonliteral -Werror ")
+  if(CMAKE_C_COMPILER_ID STREQUAL "GNU")
+    set(warnCFLAGS "${warnCFLAGS}-Wclobbered -Wno-error=clobbered ")
+    if(COMPILER_C_VERSION_MAJOR_MINOR STRGREATER "4.5")
+      set(warnCFLAGS "${warnCFLAGS}-Wno-error=unused-but-set-variable ")
+    endif()
   endif()
 
-  set(CMAKE_Fortran_FLAGS "-Wall") # FIXME: Q&D hack
+  set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -Wall") # FIXME: Q&D hack
 
   set(CMAKE_JAVA_COMPILE_FLAGS "-Xlint")
 endif()
 
 if(enable_compile_optimizations)
   set(optCFLAGS "-O3 -finline-functions -funroll-loops -fno-strict-aliasing ")
-  if(COMPILER_C_VERSION_MAJOR_MINOR STRGREATER "4.5")
-    set(optCFLAGS "${optCFLAGS}-flto ")
+  if(CMAKE_COMPILER_IS_GNUCC)
+    if(WIN32)
+      if (COMPILER_C_VERSION_MAJOR_MINOR STRGREATER "4.7")
+      # On windows, we need 4.8 or higher to enable lto because of http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50293
+        set(optCFLAGS "${optCFLAGS} -flto ")
+      endif()
+    else()    
+      # On non-windows, 4.6 is enough for that
+      if(COMPILER_C_VERSION_MAJOR_MINOR STRGREATER "4.5")
+        set(optCFLAGS "${optCFLAGS} -flto ")
+      endif()
+    endif()
   endif()
 else()
   set(optCFLAGS "-O0 ")