diff options
Diffstat (limited to 'Makefile')
| -rw-r--r-- | Makefile | 31 |
1 files changed, 26 insertions, 5 deletions
@@ -128,9 +128,9 @@ WERROR := -Werror FIRMWARE_FLAGS := -nostdinc -ffreestanding -fno-builtin -fno-stack-protector COMMON_FLAGS := -pipe ${WERROR} -Wall -Wstrict-prototypes -Wtype-limits \ -Wundef -Wmissing-prototypes -Wno-trigraphs -Wredundant-decls -Wshadow \ - -Wwrite-strings -Wstrict-aliasing -Wdate-time -Wno-unknown-warning \ - -Wno-address-of-packed-member -ffunction-sections -fdata-sections \ - -Wimplicit-fallthrough -Wformat -Wno-format-security ${DEBUG_FLAGS} + -Wwrite-strings -Wstrict-aliasing -Wdate-time \ + -ffunction-sections -fdata-sections \ + -Wformat -Wno-format-security ${DEBUG_FLAGS} # FIRMWARE_ARCH is defined if compiling for a firmware target # (coreboot or depthcharge). @@ -153,6 +153,21 @@ CC ?= gcc CFLAGS += -DCHROMEOS_ENVIRONMENT ${COMMON_FLAGS} endif +CFLAGS += -std=gnu11 + +# test_ccflag +# $(1): compiler flags to test +# $(2): code to insert into test snippet +# returns: $(1) if compiler was successful, empty string otherwise +test_ccflag = $(shell \ + printf "$(2)\nvoid _start(void) {}\n" | \ + $(CC) -nostdlib -Werror $(1) -xc -c - -o /dev/null \ + >/dev/null 2>&1 && echo "$(1)") + +COMMON_FLAGS += $(call test_ccflag,-Wimplicit-fallthrough) +COMMON_FLAGS += $(call test_ccflag,-Wno-address-of-packed-member) +COMMON_FLAGS += $(call test_ccflag,-Wno-unknown-warning) + # Needs -Wl because LD is actually set to CC by default. LDFLAGS += -Wl,--gc-sections @@ -247,8 +262,14 @@ ifeq (${FIRMWARE_ARCH},) CFLAGS += -fPIE endif -# These are required to access large disks and files on 32-bit systems. -CFLAGS += -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 +CFLAGS += -D_GNU_SOURCE + +# This is required to access large disks and files on 32-bit systems, +# but if the environment doesn't support it, at least compile support +# for what is possible. +# Pass through cflags_use_64bits to evaluate it only once, here. +cflags_use_64bits := $(call test_ccflag,-D_FILE_OFFSET_BITS=64,\#include <fts.h>) +CFLAGS += $(cflags_use_64bits) # Code coverage ifneq (${COV},) |