Clean up profiling flags in the makefile. Removed GPROF flag, it is now just

PROFILE. When enabled, automatically turn on basic symbols. Also added new
SYMLEVEL option to control the symbols level (defaults to 2). [Aaron Giles]

makefile

@@ -180,9 +180,6 @@ endif
 # uncomment next line to include the internal profiler
 # PROFILER = 1
 
-# uncomment next line to include gprof profiler support
-# GPROF = 1
-
 # uncomment the force the universal DRC to always use the C backend
 # you may need to do this if your target architecture does not have
 # a native backend
@@ -214,6 +211,10 @@ BUILD_ZLIB = 1
 # uncomment next line to include the symbols
 # SYMBOLS = 1
 
+# specify symbols level or leave commented to use the default
+# (default is SYMLEVEL = 2 normally; use 1 if you only need backtrace)
+# SYMLEVEL = 2
+
 # uncomment next line to include profiling information from the compiler
 # PROFILE = 1
 
@@ -254,10 +255,20 @@ endif
 endif
 
 # allow gprof profiling as well, which overrides the internal PROFILER
-ifdef GPROF
-CCOMFLAGS += -pg
+# also enable symbols as it is useless without them
+ifdef PROFILE
 PROFILER =
-# LIBS += -lc_p
+SYMBOLS = 1
+ifndef SYMLEVEL
+SYMLEVEL = 1
+endif
+endif
+
+# set the symbols level
+ifdef SYMBOLS
+ifndef SYMLEVEL
+SYMLEVEL = 2
+endif
 endif
 
 
@@ -296,7 +307,7 @@ RM = @rm -f
 PREFIXSDL =
 SUFFIX64 =
 SUFFIXDEBUG =
-SUFFIXGPROF =
+SUFFIXPROFILE =
 
 # Windows SDL builds get an SDL prefix
 ifeq ($(OSD),sdl)
@@ -316,8 +327,8 @@ SUFFIXDEBUG = d
 endif
 
 # gprof builds get an addition 'p' suffix
-ifdef GPROF
-SUFFIXGPROF = p
+ifdef PROFILE
+SUFFIXPROFILE = p
 endif
 
 # the name is just 'target' if no subtarget; otherwise it is
@@ -329,7 +340,7 @@ NAME = $(TARGET)$(SUBTARGET)
 endif
 
 # fullname is prefix+name+suffix+suffix64+suffixdebug
-FULLNAME = $(PREFIX)$(PREFIXSDL)$(NAME)$(SUFFIX)$(SUFFIX64)$(SUFFIXDEBUG)$(SUFFIXGPROF)
+FULLNAME = $(PREFIX)$(PREFIXSDL)$(NAME)$(SUFFIX)$(SUFFIX64)$(SUFFIXDEBUG)$(SUFFIXPROFILE)
 
 # add an EXE suffix to get the final emulator name
 EMULATOR = $(FULLNAME)$(EXE)
@@ -418,7 +429,7 @@ CCOMFLAGS += -pipe
 
 # add -g if we need symbols, and ensure we have frame pointers
 ifdef SYMBOLS
-CCOMFLAGS += -g -fno-omit-frame-pointer
+CCOMFLAGS += -g$(SYMLEVEL) -fno-omit-frame-pointer
 endif
 
 # add -v if we need verbose build information
@@ -468,6 +479,7 @@ COBJFLAGS += \
 	-Wpointer-arith 
 
 
+
 #-------------------------------------------------
 # include paths
 #-------------------------------------------------
@@ -521,12 +533,10 @@ endif
 
 # strip symbols and other metadata in non-symbols and non profiling builds
 ifndef SYMBOLS
-ifndef PROFILE
 ifneq ($(TARGETOS),macosx)
 LDFLAGS += -s
 endif
 endif
-endif
 
 # output a map file (emulator only)
 ifdef MAP
@@ -590,6 +600,8 @@ endif
 # add SoftFloat floating point emulation library
 SOFTFLOAT = $(OBJ)/libsoftfloat.a
 
+
+
 #-------------------------------------------------
 # 'default' target needs to go here, before the 
 # include files which define additional targets