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optionrom: fix detection of -Wa,-32

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The cc-option macro runs $(CC) in -S mode (generate assembly) to avoid a
pointless run of the assembler.  However, this does not work when you want
to detect support for cc->as option passthrough.  clang ignores -Wa unless
-c is provided, and exits successfully even if the -Wa,-32 option is not
supported.

Reported-by: Stefan Hajnoczi <stefanha@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 1469043409-14033-1-git-send-email-pbonzini@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Paolo Bonzini 2016-07-20 21:36:49 +02:00 committed by Peter Maydell
parent c7e9aafe5c
commit 036999e93e
2 changed files with 3 additions and 1 deletions
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2
pc-bios/optionrom/Makefile
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@ -30,7 +30,7 @@ QEMU_INCLUDES += -I$(SRC_PATH)
Wa = -Wa,
ASFLAGS += -32
QEMU_CFLAGS += $(call cc-option, $(QEMU_CFLAGS), $(Wa)-32)
QEMU_CFLAGS += $(call cc-c-option, $(QEMU_CFLAGS), $(Wa)-32)
build-all: multiboot.bin linuxboot.bin linuxboot_dma.bin kvmvapic.bin

2
rules.mak
View file

@ -113,6 +113,8 @@ quiet-command = $(if $(V),$1,$(if $(2),@echo $2 && $1, @$1))
cc-option = $(if $(shell $(CC) $1 $2 -S -o /dev/null -xc /dev/null \
>/dev/null 2>&1 && echo OK), $2, $3)
cc-c-option = $(if $(shell $(CC) $1 $2 -c -o /dev/null -xc /dev/null \
>/dev/null 2>&1 && echo OK), $2, $3)
VPATH_SUFFIXES = %.c %.h %.S %.cc %.cpp %.m %.mak %.texi %.sh %.rc
set-vpath = $(if $1,$(foreach PATTERN,$(VPATH_SUFFIXES),$(eval vpath $(PATTERN) $1)))