TP 13 exo1: Add LTO and GOLD support to the Makefile build options

[TD_C.git] / TP_13 / exo1 / Makefile

# Sample Makefile to build simple project.
#
# This Makefile expect all source files (.c) to be at the same level, in the
# $(SRC_PATH) directory.
#
# This Makefile expect all embedded library source files (.c) to be at the same level, in the
# $(LIBRARY_PATH) directory.
#
# It will automatically generate dependencies, compile all files, and produce a
# binary using the provided name linked against the library if necessary.
#
# Set BINARY_NAME to the name of the binary file to build.
# Set LIBRARY_NAME to the name of the library file to build.
# The default path for the library code and object is lib.
# By default the linker will look for $(BINARY_NAME) library name.
# Set BUILD_TYPE to either debug or release.
#
# Automatic dependencies code from:
# http://make.mad-scientist.net/papers/advanced-auto-dependency-generation/#tldr
BINARY_NAME=exo1
SRC_PATH:=src
LIBRARY_NAME=libexo1
LIBRARY_PATH:=lib
#BUILD_TYPE=debug
BUILD_TYPE=release

# ====================================
# DO NOT CHANGE STUFF BEYOND THIS LINE
# ====================================

all: $(BINARY_NAME) $(BINARY_NAME).dynamic $(BINARY_NAME).static

CC=gcc
LD=gcc
AR=ar

WARN_FLAGS = -Wall -Wextra
STD_FLAG = -std=c11

ifeq ($(BUILD_TYPE),debug)
BUILDDIR := .build/debug
DEBUG_FLAG = -g
STRIP_FLAG =
OPTI_FLAG = -O0
LTO_SUPPORT = no
GOLD_SUPPORT = no
else
BUILDDIR := .build/release
DEBUG_FLAG =
STRIP_FLAG = -s
OPTI_FLAG = -O3
LTO_SUPPORT = yes
GOLD_SUPPORT = yes
endif

ifeq ($(LTO_SUPPORT),yes)
CFLAGS_LTO = -flto -ffat-lto-objects
LDFLAGS_LTO = -fuse-linker-plugin -flto
endif

ifeq ($(GOLD_SUPPORT),yes)
LDFLAGS_GOLD = -fuse-ld=gold
endif

# Putting header files in the source directory is not the purpose of this INCLUDES variable
INCLUDES := $(INCLUDES) -I$(LIBRARY_PATH)
CFLAGS := $(CFLAGS) $(CFLAGS_LTO) $(WARN_FLAGS) $(STD_FLAG) $(OPTI_FLAG) $(DEBUG_FLAG) $(INCLUDES)
LIBCFLAGS := -fPIC $(CFLAGS)
LDFLAGS := $(LDFLAGS) $(LDFLAGS_LTO) $(LDFLAGS_GOLD) $(STRIP_FLAG)
LIBLDFLAGS := -shared $(LDFLAGS)
STATICLIBLDFLAGS := -static $(LDFLAGS)
LDLIBS := $(LDLIBS) -L$(LIBRARY_PATH) -l$(BINARY_NAME)

OBJDIR := $(BUILDDIR)/objs
$(shell mkdir -p $(OBJDIR))

SRCS=$(wildcard $(SRC_PATH)/*.c)
LIBSRCS=$(wildcard $(LIBRARY_PATH)/*.c)
OBJS=$(patsubst %.c,$(OBJDIR)/%.o,$(notdir $(SRCS)))
LIBOBJS=$(patsubst %.c,$(OBJDIR)/%.o,$(notdir $(LIBSRCS)))

DEPDIR := $(BUILDDIR)/deps
$(shell mkdir -p $(DEPDIR))
DEPFLAGS = -MT $@ -MMD -MP -MF $(DEPDIR)/$(notdir $*).Td
POSTCOMPILE = mv -f $(DEPDIR)/$(notdir $*).Td $(DEPDIR)/$(notdir $*).d

$(LIBRARY_PATH)/$(LIBRARY_NAME).a: $(LIBOBJS)
	@echo "[AR StO] $@"
	@$(AR) rcs $@ $^

$(LIBRARY_PATH)/$(LIBRARY_NAME).so: $(LIBOBJS)
	@echo "[LD ShO] $@"
	@$(LD) $(LIBCFLAGS) $(LIBLDFLAGS) $^ -o $@

#$(BINARY_NAME): $(OBJS) $(LIBOBJS)
#	@echo "[LD ] $@"
#	@$(LD) $(CFLAGS) $(LDFLAGS) $^ $(LDLIBS) -o $@

$(BINARY_NAME): $(OBJS) $(LIBRARY_PATH)/$(LIBRARY_NAME).a
	@echo "[LD ] $@"
	@$(LD) $(CFLAGS) $(LDFLAGS) $^ $(LDLIBS) -o $@

$(BINARY_NAME).static: $(OBJS) $(LIBRARY_PATH)/$(LIBRARY_NAME).a
	@echo "[LD ] $@"
	@$(LD) $(CFLAGS) $(STATICLIBLDFLAGS) $^ $(LDLIBS) -o $@

$(BINARY_NAME).dynamic: $(OBJS) $(LIBRARY_PATH)/$(LIBRARY_NAME).so
	@echo "[LD ] $@"
	@$(LD) $(CFLAGS) $(LDFLAGS) $^ $(LDLIBS) -o $@

$(OBJDIR)/%.o: $(SRC_PATH)/%.c $(DEPDIR)/%.d
	@echo "[C  ] $(notdir $*)"
	@$(CC) $(DEPFLAGS) $(CFLAGS) -c $< -o $@
	@$(POSTCOMPILE)

include $(wildcard $(patsubst %,$(DEPDIR)/%.d,$(basename $(SRCS))))

$(OBJDIR)/%.o: $(LIBRARY_PATH)/%.c $(DEPDIR)/%.d
	@echo "[C  ] $(notdir $*)"
	@$(CC) $(DEPFLAGS) $(LIBCFLAGS) -c $< -o $@
	@$(POSTCOMPILE)

include $(wildcard $(patsubst %,$(DEPDIR)/%.d,$(basename $(LIBSRCS))))

$(DEPDIR)/%.d: ;

.PRECIOUS: $(DEPDIR)/%.d

#FIXME: add an install target

clean:
	@echo "[CLN]"
	-@rm -r $(BUILDDIR)
	-@rm $(BINARY_NAME)
	-@rm $(BINARY_NAME).static
	-@rm $(BINARY_NAME).dynamic
	-@rm $(LIBRARY_PATH)/$(LIBRARY_NAME).a
	-@rm $(LIBRARY_PATH)/$(LIBRARY_NAME).so

disassemble: $(BINARY_NAME)
	objdump -d $< | less

symbols: $(BINARY_NAME)
	objdump -t $< | sort | less