follow up -MM -MF issue

[Budi via Gcc-help <gcc-help@xxxxxxxxxxx>]

This's the actual thing, a shortened version of makefile of the famous
chess engine: Stockfish
which will, at bottom doc., be modified -MM -MF <depebdency file>
from original -MM > <depebdency file>  ( by using variable $@, this
mod will be sent as Pull Request)
one of -MM -MF will result file having only content of VPATH
while -MM > result in complete dependency info

#...

### Section 1. General Configuration
### ==========================================================================

### Executable name
ifeq ($(COMP),mingw)
EXE = stockfish.exe
else
EXE = stockfish
endif

### Installation dir definitions
PREFIX = /usr/local
BINDIR = $(PREFIX)/bin

### Built-in benchmark for pgo-builds
PGOBENCH = ./$(EXE) bench

### Source and object files
SRCS = benchmark.cpp bitbase.cpp bitboard.cpp endgame.cpp evaluate.cpp
main.cpp \
	material.cpp misc.cpp movegen.cpp movepick.cpp pawns.cpp position.cpp
psqt.cpp \
	search.cpp thread.cpp timeman.cpp tt.cpp uci.cpp ucioption.cpp
tune.cpp syzygy/tbprobe.cpp

OBJS = $(notdir $(SRCS:.cpp=.o))

VPATH = syzygy

### Establish the operating system name
KERNEL = $(shell uname -s)
ifeq ($(KERNEL),Linux)
	OS = $(shell uname -o)
endif

### ==========================================================================
### Section 2. High-level Configuration
### ==========================================================================


### 2.1. General and architecture defaults
optimize = yes
debug = no
sanitize = no
bits = 64
prefetch = no
popcnt = no
sse = no
pext = no

### 2.2 Architecture specific
ifeq ($(ARCH),general-32)
	arch = any
	bits = 32
endif

ifeq ($(ARCH),x86-32-old)
	arch = i386
	bits = 32
endif
#...

### 3.8 Link Time Optimization
### This is a mix of compile and link time options because the lto link phase
### needs access to the optimization flags.
ifeq ($(optimize),yes)
ifeq ($(debug), no)
	ifeq ($(comp),$(filter $(comp),gcc clang))
		CXXFLAGS += -flto
		LDFLAGS += $(CXXFLAGS)
	endif

# To use LTO and static linking on windows, the tool chain requires a
recent gcc:
# gcc version 10.1 in msys2 or TDM-GCC version 9.2 are know to work,
older might not.
# So, only enable it for a cross from Linux by default.
	ifeq ($(comp),mingw)
	ifeq ($(KERNEL),Linux)
		CXXFLAGS += -flto
		LDFLAGS += $(CXXFLAGS)
	endif
	endif
endif
endif

### 3.9 Android 5 can only run position independent executables. Note that this
### breaks Android 4.0 and earlier.
ifeq ($(OS), Android)
	CXXFLAGS += -fPIE
	LDFLAGS += -fPIE -pie
endif

### ==========================================================================
### Section 4. Public Targets
### ==========================================================================

help:
	@echo ""
	@echo "To compile stockfish, type: "
	@echo ""
	@echo "make target ARCH=arch [COMP=compiler] [COMPCXX=cxx]"
	@echo ""
	@echo "Supported targets:"
	@echo ""
	@echo "build                   > Standard build"
	@echo "profile-build           > PGO build"
	@echo "strip                   > Strip executable"
	@echo "install                 > Install executable"
	@echo "clean                   > Clean up"
	@echo ""
#...
	@echo "make profile-build ARCH=x86-64-bmi2 COMP=gcc COMPCXX=g++-4.8"
	@echo ""


.PHONY: help build profile-build strip install clean objclean profileclean \
        config-sanity icc-profile-use icc-profile-make gcc-profile-use
gcc-profile-make \
        clang-profile-use clang-profile-make

build: config-sanity
	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) all

profile-build: config-sanity objclean profileclean
	@echo ""
	@echo "Step 1/4. Building instrumented executable ..."
	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) $(profile_make)
	@echo ""
	@echo "Step 2/4. Running benchmark for pgo-build ..."
	$(PGOBENCH) > /dev/null
	@echo ""
	@echo "Step 3/4. Building optimized executable ..."
	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) objclean
	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) $(profile_use)
	@echo ""
	@echo "Step 4/4. Deleting profile data ..."
	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) profileclean

#...

$(EXE): $(OBJS)
	$(CXX) -o $@ $(OBJS) $(LDFLAGS)

clang-profile-make:
	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) \
	EXTRACXXFLAGS='-fprofile-instr-generate ' \
	EXTRALDFLAGS=' -fprofile-instr-generate' \
	all

clang-profile-use:
	llvm-profdata merge -output=stockfish.profdata *.profraw
	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) \
	EXTRACXXFLAGS='-fprofile-instr-use=stockfish.profdata' \
	EXTRALDFLAGS='-fprofile-use ' \
	all

gcc-profile-make:
	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) \
	EXTRACXXFLAGS='-fprofile-generate' \
	EXTRALDFLAGS='-lgcov' \
	all

gcc-profile-use:
	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) \
	EXTRACXXFLAGS='-fprofile-use -fno-peel-loops -fno-tracer' \
	EXTRALDFLAGS='-lgcov' \
	all

icc-profile-make:
	@mkdir -p profdir
	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) \
	EXTRACXXFLAGS='-prof-gen=srcpos -prof_dir ./profdir' \
	all

icc-profile-use:
	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) \
	EXTRACXXFLAGS='-prof_use -prof_dir ./profdir' \
	all

.depend:
	@$(CXX) $(DEPENDFLAGS) $(SRCS) -MM -MF $@ 2> /dev/null

include .depend



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