Recude RELEASE optimization level from O>3 to O2

- Chuck Atkins (Kitware)

diff --git a/CMAKE/CheckLAPACKCompilerFlags.cmake b/CMAKE/CheckLAPACKCompilerFlags.cmake
index b7b584bcaec880f506862be9de1d13fef8a5b323..4f2884c4710b098b0ba16061b95fc247a0856fa9 100644 (file)
--- a/CMAKE/CheckLAPACKCompilerFlags.cmake
+++ b/CMAKE/CheckLAPACKCompilerFlags.cmake
@@ -3,10 +3,11 @@
 # 
 #  1.  If FPE traps are enabled either abort or disable them
 #  2.  Specify fixed form if needed
-#
+#  3.  Ensure that Release builds use O2 instead of O3
+# 
 #=============================================================================
 # Author: Chuck Atkins
-# Copyright 2010
+# Copyright 2011
 #=============================================================================
 
 macro( CheckLAPACKCompilerFlags )
@@ -52,6 +53,15 @@ elseif( (CMAKE_Fortran_COMPILER_ID STREQUAL "VisualAge" ) OR  # CMake 2.6
 else()
 endif()
 
+if( "${CMAKE_Fortran_FLAGS_RELEASE}" MATCHES "O[3-9]" )
+  message( STATUS "Reducing RELEASE optimization level from to O2" )
+  string( REGEX REPLACE "O[3-9]" "O2" CMAKE_Fortran_FLAGS_RELEASE 
+          "${CMAKE_Fortran_FLAGS_RELEASE}" )
+  set( CMAKE_Fortran_FLAGS_RELEASE "${CMAKE_Fortran_FLAGS_RELEASE}"
+       CACHE STRING "Flags used by the compiler during release builds" FORCE )
+endif()
+
+
 if( FPE_EXIT )
   message( FATAL_ERROR "Floating Point Exception (FPE) trap handlers are currently explicitly enabled in the compiler flags.  LAPACK is designed to check for and handle these cases internally and enabling these traps will likely cause LAPACK to crash.  Please re-configure with floating point exception trapping disabled." )
 endif()