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# Generic Makefile to support compilation for multiple languages.
# See also Makefile.prolog
#
# Copyright (C) 2001-2004 Free Software Foundation, Inc.
# This file is part of GCC.
# GCC is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
# GCC is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with GCC; see the file COPYING. If not, write to
# the Free Software Foundation, 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
# This Makefile provides a very generic framework of the following
# functionalities:
#
# Multi-language support (currently any combination of Ada/C/C++ supported)
# Automatic handling of source dependencies
# Handling of various C/C++ compilers
# Handling of Ada sources using the GNAT toolchain
# Complete build process (compile/bind/link)
# Individual compilation (on a file, or on a language)
# Handling of an object directory
# Here are the rules that can be used from the command line:
#
# build: complete compile/bind/link process
# compile: compile all files that are not up-to-date
# link: bind/link
# ada: compile all Ada files that are not up-to-date
# c: ditto for C files
# c++: ditto for C++ files
# <ada file>: compile the specified file if needed.
# <object file>: compile the corresponding C/C++ source file if needed.
# clean: remove all temporary files
# This Makefile expects the following variables to be set by the caller
# (typically another Makefile):
#
# ADA_SPEC extension of Ada spec files (optional, default to .ads)
# ADA_BODY extension of Ada body files (optional, default to .adb)
# C_EXT extension of C files (optional, default to .c)
# CXX_EXT extension of C++ files (optional, default to .cc)
# OBJ_EXT extension of object files (optional, default to .o)
# SRC_DIRS blank separated list of source directories
# C_SRCS explicit list of C sources (optional)
# C_SRCS_DEFINED if set, indicates that C_SRCS is already set
# CXX_SRCS explicit list of C++ sources (optional)
# CXX_SRCS_DEFINED is set, indicates that CXX_SRCS is already set
# OBJ_DIR a single directory where object files should be put
# EXEC_DIR a single directory where executables should be put (optional)
# LANGUAGES a blank separated list of languages supported, e.g "ada c"
# the current list of recognized languages is: ada, c, c++
# CC name of the C compiler (optional, default to gcc)
# CXX name of the C++ compiler (optional, default to gcc)
# AR_CMD command to create an archive (optional, default to "ar rc")
# AR_EXT file extension of an archive (optional, default to ".a")
# RANLIB command to generate an index (optional, default to "ranlib")
# GNATMAKE name of the GNAT builder (optional, default to "gnatmake")
# ADAFLAGS additional Ada compilation switches, e.g "-gnatf" (optional)
# CFLAGS default C compilation switches, e.g "-O2 -g" (optional)
# CXXFLAGS default C++ compilation switches (optional)
# LIBS libraries to link with (optional)
# LDFLAGS linker switches (optional)
# ADA_SOURCES list of main Ada sources (optional)
# EXEC name of the final executable (optional)
# MAIN language of the main program (optional)
# MAIN_OBJECT main object file (optional)
# PROJECT_FILE name of the project file, without the .gpr extension
# DEPS_PROJECTS list of project dependencies (optional)
# Set the source search path for C and C++ if needed
ifndef MAIN
MAIN=ada
endif
ifndef ADA_SPEC
ADA_SPEC=.ads
endif
ifndef ADA_BODY
ADA_BODY=.adb
endif
ifndef CC
CC=gcc
endif
ifndef CXX
CXX=gcc
endif
ifndef CXX_EXT
CXX_EXT=.cc
endif
vpath %$(C_EXT) $(SRC_DIRS)
vpath %$(CXX_EXT) $(SRC_DIRS)
ifndef OBJ_EXT
OBJ_EXT=.o
endif
ifndef AR_EXT
AR_EXT=.a
endif
ifndef AR_CMD
AR_CMD=ar rc
endif
ifndef RANLIB
RANLIB=ranlib
endif
ifndef GNATMAKE
GNATMAKE=gnatmake
endif
ifndef ARCHIVE
ARCHIVE=$(OBJ_DIR)/lib$(PROJECT_BASE)-full$(AR_EXT)
endif
ifeq ($(EXEC_DIR),)
EXEC_DIR=$(OBJ_DIR)
endif
# Set the object search path
vpath %$(OBJ_EXT) $(OBJ_DIR)
vpath %$(AR_EXT) $(OBJ_DIR)
# A target can't have a character ':' otherwise it will confuse make. We
# replace ':' by a pipe character. Note that there is less chance than a pipe
# character be part of a pathname on UNIX and this character can't be used in
# a pathname on Windows.
clean_deps = $(subst :,|,$(DEPS_PROJECTS:%=clean_%))
compile_deps = $(subst :,|,$(DEPS_PROJECTS:%=compile_%))
object_deps = $(subst :,|,$(DEPS_PROJECTS:%=object_%))
ada_deps = $(subst :,|,$(DEPS_PROJECTS:%=ada_%))
c_deps = $(subst :,|,$(DEPS_PROJECTS:%=c_%))
c++_deps = $(subst :,|,$(DEPS_PROJECTS:%=c++_%))
# Default target is to build (compile/bind/link)
all: build
clean: $(clean_deps) internal-clean
build: $(compile_deps) internal-compile internal-build
compile: $(compile_deps) internal-compile $(ADA_SOURCES)
ada: $(ada_deps) internal-ada
archive-objects: $(object_deps) internal-archive-objects
c: $(c_deps) internal-c
c++: $(c++deps) internal-c++
$(clean_deps): force
@$(MAKE) -C $(dir $(subst |,:,$(@:clean_%=%))) -f Makefile.$(notdir $@) internal-clean
$(compile_deps): force
@$(MAKE) -C $(dir $(subst |,:,$(@:compile_%=%))) -f Makefile.$(notdir $@) internal-compile
$(object_deps): force
@$(MAKE) -C $(dir $(subst |,:,$(@:object_%=%))) -f Makefile.$(notdir $@) internal-archive-objects ARCHIVE=$(ARCHIVE)
$(ada_deps): force
@$(MAKE) -C $(dir $(subst |,:,$(@:ada_%=%))) -f Makefile.$(notdir $@) internal-ada
$(c_deps): force
@$(MAKE) -C $(dir $(subst |,:,$(@:c_%=%))) -f Makefile.$(notdir $@) internal-c
$(c++_deps): force
@$(MAKE) -C $(dir $(subst |,:,$(@:c++_%=%))) -f Makefile.$(notdir $@) internal-c++
ifneq ($(EXEC),)
EXEC_RULE=-o $(EXEC)
endif
PROJECT_BASE = $(notdir $(PROJECT_FILE))
# Set C/C++ linker command & target
ifeq ($(filter c++,$(LANGUAGES)),c++)
LINKER = $(CXX)
ifeq ($(filter ada,$(LANGUAGES)),ada)
# C++ and Ada mixed
LINKER = $(OBJ_DIR)/c++linker
LARGS = --LINK=$(LINKER)
ifeq ($(strip $(filter-out %gcc %g++,$(CXX))),)
# Case of GNU C++ and GNAT
$(LINKER): Makefile.$(PROJECT_BASE)
@echo \#!/bin/sh > $(LINKER)
@echo unset BINUTILS_ROOT >> $(LINKER)
@echo unset GCC_ROOT >> $(LINKER)
@echo $(CXX) $$\* >> $(LINKER)
@chmod +x $(LINKER)
else
$(LINKER): Makefile.$(PROJECT_BASE)
@echo \#!/bin/sh > $(LINKER)
@echo $(CXX) $$\* $(shell gcc -print-libgcc-file-name) >> $(LINKER)
@chmod +x $(LINKER)
endif
endif
else
ifeq ($(strip $(LANGUAGES)),c)
# Case of C only
LINKER = $(CC)
endif
endif
C_INCLUDES := $(foreach name,$(SRC_DIRS),-I$(name))
ALL_CFLAGS = $(CFLAGS) $(C_INCLUDES) $(DEP_CFLAGS)
ALL_CXXFLAGS = $(CXXFLAGS) $(C_INCLUDES) $(DEP_CFLAGS)
LDFLAGS := $(LIBS) $(LDFLAGS)
# Compute list of objects based on languages
ifeq ($(strip $(filter c,$(LANGUAGES))),c)
# Compute list of C sources automatically unless already specified
ifndef C_SRCS_DEFINED
ifndef C_SRCS
C_SRCS := \
$(foreach name,$(SRC_DIRS),$(notdir $(wildcard $(name)/*$(C_EXT))))
endif
endif
C_OBJECTS := $(C_SRCS:$(C_EXT)=$(OBJ_EXT))
OBJECTS += $(C_OBJECTS)
endif
ifeq ($(strip $(filter c++,$(LANGUAGES))),c++)
# Compute list of C++ sources automatically unless already specified
ifndef CXX_SRCS_DEFINED
ifndef CXX_SRCS
CXX_SRCS := \
$(foreach name,$(SRC_DIRS),$(notdir $(wildcard $(name)/*$(CXX_EXT))))
endif
endif
CXX_OBJECTS := $(CXX_SRCS:$(CXX_EXT)=$(OBJ_EXT))
OBJECTS += $(CXX_OBJECTS)
endif
OBJ_FILES := $(foreach name,$(OBJECTS),$(OBJ_DIR)/$(name))
# To handle C/C++ dependencies, we associate a small file for each
# source that will list the dependencies as a make rule, so that we can then
# include these rules in this makefile, and recompute them on a file by file
# basis
DEP_FILES := $(OBJ_FILES:$(OBJ_EXT)=.d)
# Ada compilations are taken care of automatically, so do not mess with Ada
# objects, only with main sources.
ifeq ($(strip $(OBJECTS)),)
internal-compile:
internal-archive-objects:
else
internal-compile: lib$(PROJECT_BASE)$(AR_EXT)
lib$(PROJECT_BASE)$(AR_EXT): $(OBJECTS)
@echo creating archive file for $(PROJECT_BASE)
cd $(OBJ_DIR); $(AR_CMD) $@ $(strip $(OBJECTS))
-$(RANLIB) $(OBJ_DIR)/$@
internal-archive-objects: $(OBJECTS)
# @echo $(AR_CMD) $(ARCHIVE) $(strip $(OBJECTS))
# cd $(OBJ_DIR); $(AR_CMD) $(ARCHIVE) $(strip $(OBJECTS))
# -$(RANLIB) $(OBJ_DIR)/$@
endif
# Linking rules
# There are three cases:
#
# - C/C++ sources
#
# - Ada/C/C++, main program is in Ada
#
# - Ada/C/C++, main program is in C/C++
ifeq ($(strip $(filter-out c c++,$(LANGUAGES))),)
# link with C/C++
ifeq ($(MAIN_OBJECT),)
link:
@echo link: no main object specified, exiting...
exit 1
else
ifeq ($(EXEC),)
link:
@echo link: no executable specified, exiting...
exit 1
else
link: $(EXEC_DIR)/$(EXEC) archive-objects
$(EXEC_DIR)/$(EXEC): $(OBJ_FILES)
@echo $(LINKER) -o $(EXEC_DIR)/$(EXEC) $(OBJ_DIR)/$(MAIN_OBJECT) $(LDFLAGS)
$(LINKER) -o $(EXEC_DIR)/$(EXEC) $(OBJ_DIR)/$(MAIN_OBJECT) $(LDFLAGS)
endif
endif
internal-build: internal-compile link
else
ifeq ($(strip $(filter-out c c++ ada,$(LANGUAGES))),)
# link with Ada/C/C++
ifeq ($(MAIN),ada)
# Ada main
link: $(LINKER) archive-objects force
$(GNATMAKE) -b -l -P$(PROJECT_FILE) $(ADA_SOURCES) \
-largs $(LARGS) $(LDFLAGS)
internal-build: $(LINKER) archive-objects force
@echo $(GNATMAKE) -P$(PROJECT_FILE) $(ADA_SOURCES) $(EXEC_RULE) $(ADAFLAGS)
@$(GNATMAKE) -P$(PROJECT_FILE) $(EXEC_RULE) $(ADA_SOURCES) $(ADAFLAGS) \
-largs $(LARGS) $(LDFLAGS)
else
# C/C++ main
# The trick here is to force gnatmake to bind/link, even if there is no
# Ada main program. To achieve this effect, we use the -z switch, which is
# close enough to our needs, and the usual -n gnatbind switch and --LINK=
# gnatlink switch.
link: $(LINKER) archive-objects force
$(GNATMAKE) $(EXEC_RULE) -z -P$(PROJECT_FILE) $(ADA_SOURCES) \
-bargs -n -largs $(LARGS) $(LDFLAGS)
internal-build: $(LINKER) archive-objects force
@echo $(GNATMAKE) -z -P$(PROJECT_FILE) $(ADA_SOURCES) $(EXEC_RULE) $(ADAFLAGS)
@$(GNATMAKE) $(EXEC_RULE) -z \
-P$(PROJECT_FILE) $(ADA_SOURCES) $(ADAFLAGS) \
-bargs -n \
-largs $(LARGS) $(LDFLAGS)
endif
else
# unknown set of languages, fail
link:
@echo do not know how to link with the following languages: $(LANGUAGES)
exit 1
endif
endif
# Automatic handling of dependencies
ifeq ($(strip $(filter-out %gcc %g++,$(CC) $(CXX))),)
# Compiler is GCC, take avantage of the preprocessor option -MD
DEP_CFLAGS = -Wp,-MD,$(OBJ_DIR)/$(*F).d
define post-compile
@gprcmd deps $(OBJ_EXT) $(OBJ_DIR)/$(*F).d gcc
endef
# Default rule to create dummy dependency files the first time
$(OBJ_DIR)/%.d:
@echo $(*F)$(OBJ_EXT): > $@
else
# Compiler unknown, use a more general approach based on the output of $(CC) -M
DEP_FLAGS = -M
DEP_CFLAGS =
define post-compile
endef
$(OBJ_DIR)/%.d: %$(C_EXT)
@$(CC) $(DEP_FLAGS) $(ALL_CFLAGS) $< > $@
@gprcmd deps $(OBJ_EXT) $@
$(OBJ_DIR)/%.d: %$(CXX_EXT)
@$(CXX) $(DEP_FLAGS) $(ALL_CXXFLAGS) $< > $@
@gprcmd deps $(OBJ_EXT) $@
endif
ifneq ($(DEP_FILES),)
-include $(DEP_FILES)
endif
# Compilation rules
# File rules
# Compile C files individually
%$(OBJ_EXT) : %$(C_EXT)
@echo $(CC) -c $(CFLAGS) $< -o $(OBJ_DIR)/$@
ifndef FAKE_COMPILE
@$(CC) -c $(ALL_CFLAGS) $< -o $(OBJ_DIR)/$@
@$(post-compile)
endif
# Compile C++ files individually
%$(OBJ_EXT) : %$(CXX_EXT)
@echo $(CXX) -c $(CXXFLAGS) $< -o $(OBJ_DIR)/$@
ifndef FAKE_COMPILE
@$(CXX) -c $(ALL_CXXFLAGS) $< -o $(OBJ_DIR)/$@
@$(post-compile)
endif
# Compile Ada body files individually
%$(ADA_BODY) : force
$(GNATMAKE) -c -P$(PROJECT_FILE) $@ $(ADAFLAGS)
# Compile Ada spec files individually
%$(ADA_SPEC) : force
$(GNATMAKE) -c -P$(PROJECT_FILE) $@ $(ADAFLAGS)
# Languages rules
# Compile all Ada files in the project
internal-ada :
$(GNATMAKE) -c -P$(PROJECT_FILE) $(ADAFLAGS)
# Compile all C files in the project
internal-c : $(C_OBJECTS)
# Compile all C++ files in the project
internal-c++ : $(CXX_OBJECTS)
.PHONY: force internal-clean internal-archive internal-build internal-compile internal-ada internal-c internal-c++ build compile clean ada c c++
internal-clean:
@echo $(RM) $(OBJ_DIR)/*$(OBJ_EXT)
@$(RM) $(OBJ_DIR)/*$(OBJ_EXT)
@echo $(RM) $(OBJ_DIR)/*.ali
@$(RM) $(OBJ_DIR)/*.ali
@echo $(RM) $(OBJ_DIR)/b~*
@$(RM) $(OBJ_DIR)/b~*
@echo $(RM) $(OBJ_DIR)/b_*
@$(RM) $(OBJ_DIR)/b_*
@echo $(RM) $(OBJ_DIR)/*$(AR_EXT)
@$(RM) $(OBJ_DIR)/*$(AR_EXT)
@echo $(RM) $(OBJ_DIR)/*.d
@$(RM) $(OBJ_DIR)/*.d
ifneq ($(EXEC),)
@echo $(RM) $(EXEC_DIR)/$(EXEC)
@$(RM) $(EXEC_DIR)/$(EXEC)
endif
force: