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# slibc — Yet another C library
# Copyright © 2015 Mattias Andrée (maandree@member.fsf.org)
#
# This program 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 3 of the License, or
# (at your option) any later version.
#
# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
# Flags required at compilation of a libc, specifying that unhosted C is used.
CCFLAGS_UNHOSTED = -nostdinc -ffreestanding
# Preprocessor flags defined by slibc that are required to build the slibc.
CCFLAGS_SLIBC_DEFS = -D_SLIBC_SOURCE=1 -D_GNU_SOURCE=1 -D_BSD_SOURCE=1 -D_SLIBC_SUPPRESS_WARNINGS=1 \
-D_POSIX_C_SOURCE=999999L -D_XOPEN_SOURCE=9999
# Flag that specifies which C dialect the library is written.
CCFLAGS_CSTD = -std=gnu99
# Flags that specify where the system header files (that would in this case
# be this library's header files) are located.
CCFLAGS_INCLUDES = -Iinclude
# Optimisation flags.
CCFLAGS_OPTIIMISE = -Og -g
# Warning flags.
CCFLAGS_WARNINGS = -Wall -Wextra -Wdouble-promotion -Wno-format -Winit-self -Wmissing-include-dirs \
-Wtrampolines -Wfloat-equal -Wshadow -Wmissing-prototypes -Wmissing-declarations \
-Wredundant-decls -Wnested-externs -Winline -Wno-variadic-macros -Wsign-conversion \
-Wswitch-default -Wconversion -Wsync-nand -Wunsafe-loop-optimizations -Wcast-align \
-Wstrict-overflow -Wdeclaration-after-statement -Wundef -Wbad-function-cast \
-Wcast-qual -Wwrite-strings -Wlogical-op -Waggregate-return -Wstrict-prototypes \
-Wold-style-definition -Wpacked -Wvector-operation-performance \
-Wunsuffixed-float-constants -Wsuggest-attribute=const -Wsuggest-attribute=noreturn \
-Wsuggest-attribute=pure -Wsuggest-attribute=format -Wnormalized=nfkc
# -pedantic is excluded.
# -Wno-format is temporarily substituted for -Wformat=1
# All flags used required when compiling the library.
CCFLAGS_COMMON = $(CCFLAGS_UNHOSTED) $(CCFLAGS_SLIBC_DEFS) $(CCFLAGS_CSTD) $(CCFLAGS_INCLUDES) \
$(CCFLAGS_OPTIIMISE) $(CCFLAGS_WARNINGS)
CCFLAGS_COMMON += $(CPPFLAGS) $(CFLAGS)
CCFLAGS_STATIC = $(CCFLAGS_COMMON)
CCFLAGS_SHARED = $(CCFLAGS_COMMON) -fPIC -DSHARED
# Flags required when genering header file dependency list.
MMFLAGS = $(CCFLAGS_COMMON) -Igen -MG
SHE = '\#'
# Object files to build.
OBJECTS = $(shell find src | grep '\.c$$' | grep -v $(SHE) | sed -e 's:^src/:obj/:' -e 's:\.c$$:\.o:')
# All header files.
HEADERS = $(shell find . | grep '\.h$$' | grep -v $(SHE) | sed -e 's:^\./::')
# All code files.
SOURCES = $(shell find src | grep '\.c$$' | grep -v $(SHE))
# Generated headers files.
GENERATED = include/bits/intconf.h
# You may add config.mk to the topmost directory
# to change any configurations above.
-include config.mk
# The default rule.
.PHONY: default
default: all
# Include list of file dependencies for object files.
include obj/deps.mk
# Build everything.
.PHONY: all
all: $(OBJECTS)
# Build object file.
obj/%.o: $(GENERATED)
@mkdir -p $$(dirname $@)
$(CC) -c -o $@ src/$*.c $(CCFLAGS_SHARED)
# Preprocess header files.
include/%.h: gen/%.h bin/gen/%
@mkdir -p $$(dirname $@)
gpp -s // < $< > $@
bin/gen/%: obj/gen/%.o
@mkdir -p $$(dirname $@)
$(CC) $(CCFLAGS_WARNINGS) -std=c99 -o $@ $^
obj/gen/%.o: gen/%.c
@mkdir -p $$(dirname $@)
$(CC) -c -o $@ $<
# Generate list of file dependencies for object files.
obj/deps.mk: Makefile $(HEADERS) $(SOURCES) $(GENERATED)
@mkdir -p obj
find src | grep '\.c$$' | xargs $(CC) -MM $(MMFLAGS) > $@
sed -i 's#^[^ :]*\.o: src\([^ ]*\)/[^ /]*\.c#obj\1/&#' $@
sed -i 's# gen/\([^ ]*\.h\)# \1#g' $@
# Clean generated files.
.PHONY: clean
clean:
-rm -rf obj bin
-rm -f include/bits/intconf.h
# Remove all files that are not part of the source.
.PHONY: distclean
distclean: clean
-rm -f config.mk
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