Simplify build system

Makefile

@@ -1,40 +1,53 @@
 CC = 9c
 LD = 9l
-PKGGOALS := $(filter-out check test verify-map clean xim bench,$(MAKECMDGOALS))
-ifeq ($(MAKECMDGOALS),)
-PKGGOALS := all
-endif
-ifneq ($(PKGGOALS),)
-DBUS_CFLAGS := $(shell pkg-config --cflags dbus-1)
-DBUS_LIBS := $(shell pkg-config --libs dbus-1)
-WL_CFLAGS := $(shell pkg-config --cflags wayland-client xkbcommon)
-WL_LIBS := $(shell pkg-config --libs wayland-client xkbcommon)
-endif
-CFLAGS = -Wall -Wextra -O2 -g $(DBUS_CFLAGS) $(WL_CFLAGS)
+PKG_CFLAGS = $(shell pkg-config --cflags dbus-1 wayland-client xkbcommon)
+PKG_LIBS = $(shell pkg-config --libs dbus-1 wayland-client xkbcommon)
+CFLAGS = -Wall -Wextra -O2 -g $(PKG_CFLAGS)
 PROG = strans
+DOCKER_IMAGE = strans-build
 
 SRCS = $(wildcard *.c)
 OBJS = $(SRCS:.c=.o)
 
-all: $(PROG) xim bench
+all: $(PROG) xim gtk
 
 $(PROG): $(OBJS)
-	$(LD) -o $@ $(OBJS) -lthread -lString -lbio -lxcb -lm $(DBUS_LIBS) $(WL_LIBS)
+	$(LD) -o $@ $(OBJS) -lthread -lString -lbio -lxcb -lm $(PKG_LIBS)
 
 $(OBJS): dat.h fn.h ipc.h
+# Avoid Arch's GLIBC_2.43 sqrtf optimization for older glibc runtimes.
+font.o: CFLAGS += -fno-builtin-sqrt
+font.o: stb_truetype.h
+wayland.o: input-method-unstable-v2-client-protocol.h \
+	virtual-keyboard-unstable-v1-client-protocol.h
 
 clean:
 	rm -f $(OBJS) $(PROG)
 	$(MAKE) -C tests clean
 	$(MAKE) -C xim/ clean
+	$(MAKE) -C gtk/ clean
 	$(MAKE) -C bench/ clean
 
 xim:
 	$(MAKE) -C xim/
 
+gtk:
+	$(MAKE) -C gtk/
+
 bench:
 	$(MAKE) -C bench/
 
+docker: Dockerfile
+	docker build -t $(DOCKER_IMAGE) - < Dockerfile
+	docker run --rm --user "$$(id -u):$$(id -g)" \
+		-v "$(CURDIR):/src" $(DOCKER_IMAGE) \
+		sh -c 'make clean && make all'
+
+docker-check: docker
+	docker run --rm --user "$$(id -u):$$(id -g)" \
+		-e TESTARGS="$(TESTARGS)" -v "$(CURDIR):/src" \
+		$(DOCKER_IMAGE) make check
+
 check: verify-map test
 
 test:
@@ -45,4 +58,4 @@ verify-map:
 	python3 -B map/mkemoji | cmp - map/emoji.dict
 	python3 -B tests/mkemoji_test.py
 
-.PHONY: all check test verify-map clean xim bench
+.PHONY: all check test verify-map clean xim gtk bench docker docker-check