Makefile: Ensure that user-supplied CFLAGS get respected

Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

.travis.yml

@@ -4,7 +4,7 @@ sudo: false
 language: c
 
 # treat all warnings as errors
-env: EXTRA_CFLAGS=-Werror
+env: CFLAGS=-Werror
 
 os:
   - linux

Makefile

@@ -17,21 +17,21 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 CC ?= gcc
-CFLAGS = -g -O0 -Wall -Wextra $(EXTRA_CFLAGS)
-CFLAGS += -std=c99 $(DEFINES)
-CFLAGS += -Iinclude/
+DEFAULT_CFLAGS := -g -O0 -Wall -Wextra -std=c99
 
-DEFINES = -D_POSIX_C_SOURCE=200112L
+DEFAULT_CFLAGS += -D_POSIX_C_SOURCE=200112L
 # Define _BSD_SOURCE, necessary to expose all endian conversions properly.
 # See http://linux.die.net/man/3/endian
-DEFINES += -D_BSD_SOURCE
+DEFAULT_CFLAGS += -D_BSD_SOURCE
 # glibc 2.20+ also requires _DEFAULT_SOURCE
-DEFINES += -D_DEFAULT_SOURCE
+DEFAULT_CFLAGS += -D_DEFAULT_SOURCE
 ifeq (NetBSD,$(OS))
 # add explicit _NETBSD_SOURCE, see https://github.com/linux-sunxi/sunxi-tools/pull/22
-DEFINES += -D_NETBSD_SOURCE
+DEFAULT_CFLAGS += -D_NETBSD_SOURCE
 endif
 
+DEFAULT_CFLAGS += -Iinclude/
+
 # Tools useful on host and target
 TOOLS = sunxi-fexc sunxi-bootinfo sunxi-fel sunxi-nand-part
 
@@ -49,6 +49,7 @@ MISC_TOOLS = phoenix_info sunxi-nand-image-builder
 BINFILES = fel-pio.bin jtag-loop.sunxi fel-sdboot.sunxi uart0-helloworld-sdboot.sunxi
 
 CROSS_COMPILE ?= arm-none-eabi-
+CROSS_CC ?= $(CROSS_COMPILE)gcc
 MKSUNXIBOOT ?= mksunxiboot
 
 DESTDIR ?=
@@ -110,24 +111,26 @@ LIBUSB_CFLAGS ?= `pkg-config --cflags $(LIBUSB)`
 LIBUSB_LIBS ?= `pkg-config --libs $(LIBUSB)`
 ifeq ($(OS),Windows_NT)
 	# Windows lacks mman.h / mmap()
-	DEFINES += -DNO_MMAP
+	DEFAULT_CFLAGS += -DNO_MMAP
 	# portable_endian.h relies on winsock2
 	LIBS += -lws2_32
 endif
 
+HOST_CFLAGS = $(DEFAULT_CFLAGS) $(CFLAGS)
+
 sunxi-fel: fel.c fel-to-spl-thunk.h progress.c progress.h
-	$(CC) $(CFLAGS) $(LIBUSB_CFLAGS) $(LDFLAGS) -o $@ $(filter %.c,$^) $(LIBS) $(LIBUSB_LIBS)
+	$(CC) $(HOST_CFLAGS) $(LIBUSB_CFLAGS) $(LDFLAGS) -o $@ $(filter %.c,$^) $(LIBS) $(LIBUSB_LIBS)
 
 sunxi-nand-part: nand-part-main.c nand-part.c nand-part-a10.h nand-part-a20.h
-	$(CC) $(CFLAGS) -c -o nand-part-main.o nand-part-main.c
-	$(CC) $(CFLAGS) -c -o nand-part-a10.o nand-part.c -D A10
-	$(CC) $(CFLAGS) -c -o nand-part-a20.o nand-part.c -D A20
+	$(CC) $(HOST_CFLAGS) -c -o nand-part-main.o nand-part-main.c
+	$(CC) $(HOST_CFLAGS) -c -o nand-part-a10.o nand-part.c -D A10
+	$(CC) $(HOST_CFLAGS) -c -o nand-part-a20.o nand-part.c -D A20
 	$(CC) $(LDFLAGS) -o $@ nand-part-main.o nand-part-a10.o nand-part-a20.o $(LIBS)
 
 sunxi-%: %.c
-	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(filter %.c,$^) $(LIBS)
+	$(CC) $(HOST_CFLAGS) $(LDFLAGS) -o $@ $(filter %.c,$^) $(LIBS)
 phoenix_info: phoenix_info.c
-	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $< $(LIBS)
+	$(CC) $(HOST_CFLAGS) $(LDFLAGS) -o $@ $< $(LIBS)
 
 %.bin: %.elf
 	$(CROSS_COMPILE)objcopy -O binary $< $@
@@ -143,39 +146,39 @@ ARM_ELF_FLAGS += -mno-thumb-interwork -fno-stack-protector -fno-toplevel-reorder
 ARM_ELF_FLAGS += -Wstrict-prototypes -Wno-format-nonliteral -Wno-format-security
 
 fel-pio.elf: fel-pio.c fel-pio.lds
-	$(CROSS_COMPILE)gcc  -g  $(ARM_ELF_FLAGS)  $< -nostdlib -o $@ -T fel-pio.lds
+	$(CROSS_CC) -g $(ARM_ELF_FLAGS) $< -nostdlib -o $@ -T fel-pio.lds
 
 fel-pio.nm: fel-pio.elf
 	$(CROSS_COMPILE)nm $< | grep -v " _" >$@
 
 jtag-loop.elf: jtag-loop.c jtag-loop.lds
-	$(CROSS_COMPILE)gcc  -g  $(ARM_ELF_FLAGS)  $< -nostdlib -o $@ -T jtag-loop.lds -Wl,-N
+	$(CROSS_CC) -g $(ARM_ELF_FLAGS) $< -nostdlib -o $@ -T jtag-loop.lds -Wl,-N
 
 fel-sdboot.elf: fel-sdboot.S fel-sdboot.lds
-	$(CROSS_COMPILE)gcc  -g  $(ARM_ELF_FLAGS)  $< -nostdlib -o $@ -T fel-sdboot.lds -Wl,-N
+	$(CROSS_CC) -g $(ARM_ELF_FLAGS) $< -nostdlib -o $@ -T fel-sdboot.lds -Wl,-N
 
 uart0-helloworld-sdboot.elf: uart0-helloworld-sdboot.c uart0-helloworld-sdboot.lds
-	$(CROSS_COMPILE)gcc  -g  $(ARM_ELF_FLAGS)  $< -nostdlib -o $@ -T uart0-helloworld-sdboot.lds -Wl,-N
+	$(CROSS_CC) -g $(ARM_ELF_FLAGS) $< -nostdlib -o $@ -T uart0-helloworld-sdboot.lds -Wl,-N
 
 boot_head_sun3i.elf: boot_head.S boot_head.lds
-	$(CROSS_COMPILE)gcc  -g  $(ARM_ELF_FLAGS)  $< -nostdlib -o $@ -T boot_head.lds -Wl,-N -DMACHID=0x1094
+	$(CROSS_CC) -g $(ARM_ELF_FLAGS) $< -nostdlib -o $@ -T boot_head.lds -Wl,-N -DMACHID=0x1094
 
 boot_head_sun4i.elf: boot_head.S boot_head.lds
-	$(CROSS_COMPILE)gcc  -g  $(ARM_ELF_FLAGS)  $< -nostdlib -o $@ -T boot_head.lds -Wl,-N -DMACHID=0x1008
+	$(CROSS_CC) -g $(ARM_ELF_FLAGS) $< -nostdlib -o $@ -T boot_head.lds -Wl,-N -DMACHID=0x1008
 
 boot_head_sun5i.elf: boot_head.S boot_head.lds
-	$(CROSS_COMPILE)gcc  -g  $(ARM_ELF_FLAGS)  $< -nostdlib -o $@ -T boot_head.lds -Wl,-N -DMACHID=0x102A
+	$(CROSS_CC) -g $(ARM_ELF_FLAGS) $< -nostdlib -o $@ -T boot_head.lds -Wl,-N -DMACHID=0x102A
 
 sunxi-bootinfo: bootinfo.c
 
 # target tools
-TARGET_CFLAGS = -g -O0 -Wall -Wextra -std=c99 $(DEFINES) -Iinclude/ -static
+TARGET_CFLAGS = $(DEFAULT_CFLAGS) -static $(CFLAGS)
 sunxi-pio: pio.c
-	$(CROSS_COMPILE)gcc $(TARGET_CFLAGS) -o $@ $<
+	$(CROSS_CC) $(TARGET_CFLAGS) -o $@ $<
 sunxi-meminfo: meminfo.c
-	$(CROSS_COMPILE)gcc $(TARGET_CFLAGS) -o $@ $<
+	$(CROSS_CC) $(TARGET_CFLAGS) -o $@ $<
 sunxi-script_extractor: script_extractor.c
-	$(CROSS_COMPILE)gcc $(TARGET_CFLAGS) -o $@ $<
+	$(CROSS_CC) $(TARGET_CFLAGS) -o $@ $<
 
 version.h:
 	@./autoversion.sh > $@