Add gprof profiling support. (#7547)

CMakeLists.txt

@@ -102,6 +102,7 @@ option(WANT_DEBUG_ASAN	"Enable AddressSanitizer" OFF)
 option(WANT_DEBUG_TSAN	"Enable ThreadSanitizer" OFF)
 option(WANT_DEBUG_MSAN	"Enable MemorySanitizer" OFF)
 option(WANT_DEBUG_UBSAN	"Enable UndefinedBehaviorSanitizer" OFF)
+option(WANT_DEBUG_GPROF	"Enable gprof profiler" OFF)
 OPTION(BUNDLE_QT_TRANSLATIONS	"Install Qt translation files for LMMS" OFF)
 
 
@@ -664,6 +665,22 @@ elseif(MSVC)
 	add_compile_options("/utf-8")
 ENDIF()
 
+# gcc builds support gprof for profiling
+# clang too seems to support gprof, but i couldn't get it working.
+# if needed, change the if condition to "GNU|CLANG"
+if(NOT CMAKE_CXX_COMPILER_ID MATCHES "GNU")
+	set(STATUS_GPROF ", NOT SUPPORTED BY THIS COMPILER")
+	set(WANT_DEBUG_GPROF OFF)
+endif()
+
+if(WANT_DEBUG_GPROF)
+	add_compile_options(-pg)
+	add_link_options(-pg)
+	set(STATUS_GPROF "OK")
+else()
+	set(STATUS_GPROF "DISABLED ${STATUS_GPROF}")
+endif()
+
 # add enabled sanitizers
 function(add_sanitizer sanitizer supported_compilers want_flag status_flag)
 	if(${want_flag})
@@ -831,6 +848,7 @@ MESSAGE(
 "* Debug using ThreadSanitizer       : ${STATUS_DEBUG_TSAN}\n"
 "* Debug using MemorySanitizer       : ${STATUS_DEBUG_MSAN}\n"
 "* Debug using UBSanitizer           : ${STATUS_DEBUG_UBSAN}\n"
+"* Profile using GNU profiler        : ${STATUS_GPROF}\n"
 )
 
 MESSAGE(

plugins/LadspaEffect/swh/CMakeLists.txt

@@ -13,7 +13,7 @@ ENDIF()
 # Additional compile flags
 if(NOT MSVC)
 	set(COMPILE_FLAGS ${COMPILE_FLAGS} -O3 -c
-		-fomit-frame-pointer -funroll-loops -ffast-math -fno-strict-aliasing
+		-funroll-loops -ffast-math -fno-strict-aliasing
 		${PIC_FLAGS}
 	)
 endif()

plugins/LadspaEffect/tap/CMakeLists.txt

@@ -6,7 +6,7 @@ LIST(SORT PLUGIN_SOURCES)
 if(MSVC)
 	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /fp:fast")
 else()
-	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O3 -fomit-frame-pointer -fno-strict-aliasing -funroll-loops -ffast-math")
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O3 -fno-strict-aliasing -funroll-loops -ffast-math")
 endif()
 FOREACH(_item ${PLUGIN_SOURCES})
 	GET_FILENAME_COMPONENT(_plugin "${_item}" NAME_WE)