GNUmakefile

# Self-contained GNU makefile for libcss.
#
# GNU make prefers GNUmakefile over the upstream netsurf-buildsystem Makefile,
# so plain `make` here builds libcss without that buildsystem.  This file is
# deliberately standalone — it touches nothing else in the tree and writes all
# output under build-gnu/ (already covered by the build-* .gitignore) — so the
# commit that adds it can be rebased cleanly onto upstream.  `make -f Makefile`
# still drives the original buildsystem.
#
# It builds a static archive: build-gnu/libcss.a
#
# libcss depends on libparserutils and libwapcaplet for headers.  They default
# to sibling git checkouts (../libparserutils, ../libwapcaplet) and otherwise
# fall back to pkg-config.  Override explicitly with:
#   make PARSERUTILS=/path/to/libparserutils WAPCAPLET=/path/to/libwapcaplet

CC       ?= cc
AR       ?= ar
BUILDDIR := build-gnu
LIB      := $(BUILDDIR)/libcss.a

all: $(LIB)

# --- Dependency headers ------------------------------------------------------
PARSERUTILS ?= $(wildcard ../libparserutils)
WAPCAPLET   ?= $(wildcard ../libwapcaplet)

DEP_CFLAGS :=
ifneq ($(PARSERUTILS),)
  DEP_CFLAGS += -I$(PARSERUTILS)/include
else
  DEP_CFLAGS += $(shell pkg-config --cflags libparserutils 2>/dev/null)
endif
ifneq ($(WAPCAPLET),)
  DEP_CFLAGS += -I$(WAPCAPLET)/include
else
  DEP_CFLAGS += $(shell pkg-config --cflags libwapcaplet 2>/dev/null)
endif

# _ALIGNED / STMTEXPR are the struct-attribute macros the netsurf buildsystem
# supplies (see buildsystem/makefiles/Makefile.gcc); the sources expect them.
CFLAGS := -std=c99 -O2 -g \
	-D_BSD_SOURCE -D_DEFAULT_SOURCE \
	-D_ALIGNED="__attribute__((aligned))" -DSTMTEXPR=1 \
	-Iinclude -Isrc $(DEP_CFLAGS)

# --- Ordinary sources --------------------------------------------------------
# Everything under src/ except the parser-generator tool (it has its own
# main()) and any in-tree autogenerated_*.c (we generate our own copies below).
SRCS := $(shell find src -name '*.c' \
	! -name 'css_property_parser_gen.c' ! -name 'autogenerated_*.c')
OBJS := $(patsubst src/%.c,$(BUILDDIR)/%.o,$(SRCS))

# --- Generated longhand property parsers -------------------------------------
# css_property_parser_gen.c is a build-time tool that emits one
# autogenerated_<prop>.c per property listed in properties.gen.
PROPGEN   := src/parse/properties/properties.gen
AUTOPROPS := $(shell perl -ne 'next if /^\#/; print "$$1 " if /^([^:]+):/' $(PROPGEN))
AUTOOBJS  := $(patsubst %,$(BUILDDIR)/gen/autogenerated_%.o,$(AUTOPROPS))
OBJS      += $(AUTOOBJS)

$(LIB): $(OBJS)
	@mkdir -p $(dir $@)
	$(AR) cr $@ $^

$(BUILDDIR)/%.o: src/%.c
	@mkdir -p $(dir $@)
	$(CC) $(CFLAGS) -MMD -MP -MF $(@:.o=.d) -c -o $@ $<

$(BUILDDIR)/gen_parser: src/parse/properties/css_property_parser_gen.c
	@mkdir -p $(dir $@)
	$(CC) -O2 -o $@ $<

.SECONDARY: $(AUTOOBJS:.o=.c)
$(BUILDDIR)/gen/autogenerated_%.c: $(PROPGEN) $(BUILDDIR)/gen_parser
	@mkdir -p $(dir $@)
	$(BUILDDIR)/gen_parser -o $@ "$$(grep '^$*:' $(PROPGEN))"

$(BUILDDIR)/gen/%.o: $(BUILDDIR)/gen/%.c
	$(CC) $(CFLAGS) -MMD -MP -MF $(@:.o=.d) -c -o $@ $<

clean:
	rm -rf $(BUILDDIR)

.PHONY: all clean

# Include only dep files that already exist, so make never tries to *build* a
# .d (which would misfire the autogenerated_%.c pattern into phantom targets).
-include $(shell find $(BUILDDIR) -name '*.d' 2>/dev/null)