cmake: add option for GCC profiling

using `-ggdb3` and `-gp` with GCC enables verbose debugging and
profiling abilities useful for further analysis; also the tests will get
compiled with `-ftest-coverage` if both CMake variables
(`pfasst_BUILD_TESTS` and `pfasst_WITH_GCC_PROF`) are enabled and you
are compiling with GCC

Author: torbjoernk

CMakeLists.txt

@@ -13,6 +13,7 @@ option(pfasst_DISABLE_LIBCXX "Disable use of LLVM's libc++ when compiling with C
 option(pfasst_BUILD_EXAMPLES "Build example programs."                                 ON )
 option(pfasst_BUILD_TESTS    "Build test suite for PFASST."                            ON )
 option(pfasst_WITH_MPI       "Build with MPI enabled."                                 OFF)
+option(pfasst_WITH_GCC_PROF  "Enable excessive debugging & profiling output with GCC." OFF)
 
 # Set output directories
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${pfasst_SOURCE_DIR}/dist/bin")
@@ -32,6 +33,9 @@ if(${CMAKE_CXX_COMPILER_ID} MATCHES GNU)
     else()
         message(FATAL_ERROR "No advanced standard C++ support of your GCC (-std=c++11 not defined).")
     endif()
+    if(pfasst_WITH_GCC_PROF)
+        add_to_string_list("${CMAKE_CXX_FLAGS}" CMAKE_CXX_FLAGS "-ggdb3 -pg")
+    endif(pfasst_WITH_GCC_PROF)
 elseif(${CMAKE_CXX_COMPILER_ID} MATCHES Clang)
     check_cxx_compiler_flag(-std=c++11 HAVE_STD11)
     if(HAVE_STD11)
@@ -72,6 +76,9 @@ set(pfasst_DEPENDEND_LIBS)
 
 if(pfasst_BUILD_TESTS)
     enable_testing()
+    if(pfasst_WITH_GCC_PROF)
+        add_to_string_list("${CMAKE_CXX_FLAGS}" CMAKE_CXX_FLAGS "-ftest-coverage")
+    endif(pfasst_WITH_GCC_PROF)
 endif(pfasst_BUILD_TESTS)
 
 # Add / include 3rd-party libraries