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pc-bios/optionrom: detect CC options just once 

In preparation for adding Docker container support, detect compiler options
just once rather than once per Make run; container startup overhead is
substantial and doing the detection just once makes things faster.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20220929114231.583801-14-alex.bennee@linaro.org>
This commit is contained in:
Paolo Bonzini 2022-09-29 12:41:53 +01:00 committed by Alex Bennée
parent 100c459f19
commit 66c9f20f5b
1 changed files with 25 additions and 12 deletions
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37
pc-bios/optionrom/Makefile
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@ -8,23 +8,33 @@ all: multiboot.bin multiboot_dma.bin linuxboot.bin linuxboot_dma.bin kvmvapic.bi
CFLAGS = -O2 -g
NULL :=
SPACE := $(NULL) #
TARGET_PREFIX := $(patsubst %/,%:$(SPACE),$(TARGET_DIR))
quiet-@ = $(if $(V),,@)
quiet-command = $(if $(V),$1,$(if $(2),@printf " %-7s %s\n" $2 $3 && $1, @$1))
cc-option = $(if $(shell $(CC) $1 -c -o /dev/null -xc /dev/null >/dev/null 2>&1 && echo OK), $1, $2)
override CFLAGS += -march=i486 -Wall $(EXTRA_CFLAGS) -m16
# If -fcf-protection is enabled in flags or compiler defaults that will
# conflict with -march=i486
override CFLAGS += $(call cc-option, -fcf-protection=none)
# Flags for dependency generation
override CPPFLAGS += -MMD -MP -MT $@ -MF $(@D)/$(*F).d
override CFLAGS += $(call cc-option, -fno-pie)
override CFLAGS += $(call cc-option, -no-pie)
override CFLAGS += -march=i486 -Wall $(EXTRA_CFLAGS) -m16
override CFLAGS += -ffreestanding -I$(TOPSRC_DIR)/include
override CFLAGS += $(call cc-option, -fno-stack-protector)
override CFLAGS += $(call cc-option, -Wno-array-bounds)
cc-test = $(CC) -Werror $1 -c -o /dev/null -xc /dev/null >/dev/null 2>/dev/null
cc-option = if $(call cc-test, $1); then \
echo "$(TARGET_PREFIX)$1 detected" && echo "override CFLAGS += $1" >&3; else \
echo "$(TARGET_PREFIX)$1 not detected" $(if $2,&& echo "override CFLAGS += $2" >&3); fi
# If -fcf-protection is enabled in flags or compiler defaults that will
# conflict with -march=i486
config-cc.mak: Makefile
$(quiet-@)($(call cc-option,-fcf-protection=none); \
$(call cc-option,-fno-pie); \
$(call cc-option,-no-pie); \
$(call cc-option,-fno-stack-protector); \
$(call cc-option,-Wno-array-bounds)) 3> config-cc.mak
-include config-cc.mak
override LDFLAGS = -nostdlib -Wl,-T,$(SRC_DIR)/flat.lds
@ -50,7 +60,10 @@ include $(wildcard *.d)
clean:
rm -f *.o *.d *.raw *.img *.bin *~
distclean:
rm -f config-cc.mak
# suppress auto-removal of intermediate files
.SECONDARY:
.PHONY: all clean
.PHONY: all clean distclean