disable ccache if ENABLE_PGO is ON.

CMakeLists.txt

@@ -33,7 +33,7 @@ option(ENABLE_PGO "enable -fprofile-generate/-fprofile-use" OFF)
 option(ENABLE_LTO "enable -flto (only if ENABLE_PGO=ON as well)" OFF)
 
 # automatically use ccache if found
-if(ENABLE_CCACHE)
+if(ENABLE_CCACHE AND NOT ENABLE_PGO)
   find_program(CCACHE ccache)
   if(CCACHE)
     message(STATUS "found ccache ${CCACHE}")
@@ -81,9 +81,9 @@ macro(ADD_PROFILE_FLAGS)
   if(NOT "${PROFILE_DIR}" STREQUAL "")
     set(PROFILE_STATE "${PROFILE_STATE}=${PROFILE_DIR}")
   endif()
-  set(PROFILE_C_FLAGS "-fprofile-${PROFILE_STATE} ${LTO_FLAGS}")
-  set(PROFILE_CXX_FLAGS "-fprofile-${PROFILE_STATE} ${LTO_FLAGS}")
-  set(PROFILE_LINK_FLAGS "-fprofile-${PROFILE_STATE} ${LTO_FLAGS}")
+  set(PROFILE_C_FLAGS "-fprofile-${PROFILE_STATE} ${LTO_FLAGS} -fprofile-correction")
+  set(PROFILE_CXX_FLAGS "-fprofile-${PROFILE_STATE} ${LTO_FLAGS} -fprofile-correction")
+  set(PROFILE_LINK_FLAGS "-fprofile-${PROFILE_STATE} ${LTO_FLAGS} -fprofile-correction")
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${PROFILE_CXX_FLAGS} ${LTO_FLAGS}")
 endmacro()