# Copyright (C) 2015 Mattias Andrée <maandree@member.fsf.org>
#
# Copying and distribution of this file, with or without modification,
# are permitted in any medium without royalty provided the copyright
# notice and this notice are preserved. This file is offered as-is,
# without any warranty.
#=== This file includes rules for C programs. ===#
# This file is ignored unless _C_STD is defined.
# _C_STD should be set the the version of C that
# is used.
#
# If you want to compile with -pedantic, define
# the variable _PEDANTIC.
#
# Define _CPPFLAGS with any additional CPP
# flags to use, _CFLAGS with any additional CC
# flags to use, and _LDFLAGS with any additional
# LD flags to use.
#
# Defined in path.mk, you can change _ALL_DIRS
# if you do not want CPP definitions for all
# directories.
#
# Define _HEADER_DIRLEVELS to specify the directory
# nesting level in src. It is assumed that all
# directories contain header files. Set to '0' if
# there are no header files.
#
# _BIN shall list all commands to build. These
# should be the basenames. For each command
# you should be the variable _OBJ_$(COMMAND)
# that lists all objects files (without the
# suffix and without the obj/ prefix) that
# are required to build the command.
ifdef _C_STD
# WHEN TO BUILD, INSTALL, AND UNINSTALL:
cmd: cmd-c
install-cmd: install-cmd-c
uninstall: uninstall-cmd-c
# HELP VARIABLES:
# Figure out whether the GCC is being used.
ifeq ($(shell $(PRINTF) '%s\n' ${CC} | $(HEAD) -n 1),gcc)
__USING_GCC = 1
endif
# BUILD VARIABLES:
# Optimisation settings for C code compilation.
ifdef DEBUG
OPTIMISE = -Og -g
else
ifndef OPTIMISE
OPTIMISE = -O2
endif
endif
# Warning settings for C code compilation.
ifdef _PEDANTIC
_PEDANTIC = -pedantic
endif
ifdef __USING_GCC
WARN = -Wall -Wextra $(_PEDANTIC) -Wdouble-promotion -Wformat=2 -Winit-self -Wmissing-include-dirs \
-Wtrampolines -Wmissing-prototypes -Wmissing-declarations -Wnested-externs \
-Wno-variadic-macros -Wsync-nand -Wunsafe-loop-optimizations -Wcast-align \
-Wdeclaration-after-statement -Wundef -Wbad-function-cast -Wwrite-strings -Wlogical-op \
-Wstrict-prototypes -Wold-style-definition -Wpacked -Wvector-operation-performance \
-Wunsuffixed-float-constants -Wsuggest-attribute=const -Wsuggest-attribute=noreturn \
-Wsuggest-attribute=format -Wnormalized=nfkc -fstrict-aliasing -fipa-pure-const -ftree-vrp \
-fstack-usage -funsafe-loop-optimizations -Wshadow -Wredundant-decls -Winline -Wcast-qual \
-Wsign-conversion -Wstrict-overflow=5 -Wconversion -Wsuggest-attribute=pure -Wswitch-default \
-Wstrict-aliasing=1 -fstrict-overflow -Wfloat-equal -Wpadded -Waggregate-return \
-Wtraditional-conversion
else
WARN = -Wall -Wextra $(_PEDANTIC)
endif
# Support for internationalisation?
ifndef WITHOUT_GETTEXT
_CPPFLAGS += -D'USE_GETTEXT=1'
endif
# Add CPP definitions for all directories.
_CPPFLAGS += $(foreach D,$(_ALL_DIRS),-D'$(D)="$($(D))"')
# MORE HELP VARIABLES:
# Compilation and linking flags, and command.
__CC = $(CC) -std=$(_C_STD) $(OPTIMISE) $(WARN) $(_CPPFLAGS) $(_CFLAGS) -c
__LD = $(CC) -std=$(_C_STD) $(OPTIMISE) $(WARN) $(_LDFLAGS)
__CC_POST = $(CPPFLAGS) $(CFLAGS)
__LD_POST = $(LDFLAGS)
# Header files.
__H =
ifdef _HEADER_DIRLEVELS
ifeq ($(_HEADER_DIRLEVELS),1)
__H += src/*.h
else
ifeq ($(_HEADER_DIRLEVELS),2)
__H += src/*.h
__H += src/*/*.h
else
ifneq ($(_HEADER_DIRLEVELS),0)
__H += $(foreach W,$(shell $(SEQ) $(_HEADER_DIRLEVELS) | while read n; do $(ECHO) $$($(SEQ) $$n)" " | $(SED) 's/[^ ]* /\/\*/g'; done | $(XARGS) $(ECHO)),src$(W).h)
endif
endif
endif
endif
# BUILD RULES:
.PHONY: cmd-c
cmd-c: $(foreach B,$(_BIN),bin/$(B))
# Compile a C file into an object file.
obj/%.o: src/%.c $(__H)
@$(PRINTF_INFO) '\e[00;01;31mCC\e[34m %s\e[00m$A\n' "$@"
@$(MKDIR) -p $(shell dirname $@)
$(Q)$(__CC) -o $@ $< $(__CC_POST) #$Z
@$(ECHO_EMPTY)
# Link object files into a command.
# Dependencies are declared below..
bin/%:
@$(PRINTF_INFO) '\e[00;01;31mLD\e[34m %s\e[00;32m$A\n' "$@"
@$(MKDIR) -p bin
$(Q)$(__LD) -o $@ $^ $(__LD_POST) #$Z
@$(ECHO_EMPTY)
# Dependencies for the rule above.
$(foreach B,$(_BIN),$(foreach O,$(_OBJ_$(B)),bin/$(B): obj/$(O).o\
))
# INSTALL RULES:
.PHONY: install-cmd-c
install-cmd-c: $(foreach B,$(_BIN),bin/$(B))
@$(PRINTF_INFO) '\e[00;01;31mINSTALL\e[34m %s\e[00m\n' "$@"
$(Q)$(INSTALL_DIR) -- "$(DESTDIR)$(BINDIR)"
ifdef COMMAND
$(Q)$(INSTALL_PROGRAM) $(__STRIP) $^ -- "$(DESTDIR)$(BINDIR)"
else
$(Q)$(INSTALL_PROGRAM) $(__STRIP) $^ -- "$(DESTDIR)$(BINDIR)/$(COMMAND)"
endif
@$(ECHO_EMPTY)
# UNINSTALL RULES:
.PHONY: uninstall-cmd-c
uninstall-cmd-c:
ifdef COMMAND
-$(Q)$(RM) -- "$(DESTDIR)$(BINDIR)/$(COMMAND)"
else
-$(Q)$(RM) -- $(foreach B,$(_BIN),"$(DESTDIR)$(BINDIR)/$(B)")
endif
endif
