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Only pass -P to cpp when generating ld scripts 

When building sandbox with ccache, one would hit warnings such as:
    warning: 'struct mmsghdr' declared inside parameter list
on random files; a way to reproduce this issue is to build a simple
file doing just:
    #include <sys/socket.h>

    int main(void) {
        return 0;
    }

    gcc -Wall -P -c -o foo foo.c

But actually the -P flag is only useful when generating non-C files,
such as linker scripts in the case of barebox.  Removing the -P flag
from all the gcc invocations, except when generating .lds files makes
the warning go away.  It turns out that this is what
linux/scripts/Makefile.build also does nowadays.

Signed-off-by: Loïc Minier <loic.minier@linaro.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Loïc Minier 2011-10-14 00:06:37 +02:00 committed by Sascha Hauer
parent 2b5d8792ac
commit 4e26fba680
8 changed files with 6 additions and 8 deletions
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2
Makefile
View File

@ -825,7 +825,7 @@ prepare prepare-all: prepare0
# Leave this as default for preprocessing barebox.lds.S, which is now
# done in arch/$(ARCH)/kernel/Makefile
export CPPFLAGS_barebox.lds += -P -C -U$(ARCH)
export CPPFLAGS_barebox.lds += -C -U$(ARCH)
# FIXME: The asm symlink changes when $(ARCH) changes. That's
# hard to detect, but I suppose "make mrproper" is a good idea

2
arch/arm/Makefile
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@ -121,7 +121,7 @@ endif
TEXT_BASE = $(CONFIG_TEXT_BASE)
CPPFLAGS += -DTEXT_BASE=$(TEXT_BASE) -P
CPPFLAGS += -DTEXT_BASE=$(TEXT_BASE)
ifndef CONFIG_MODULES
# Add cleanup flags

2
arch/blackfin/Makefile
View File

@ -7,7 +7,7 @@ cpu-$(CONFIG_BF561) := bf561
TEXT_BASE = $(CONFIG_TEXT_BASE)
CPPFLAGS += -DTEXT_BASE=$(TEXT_BASE) -P
CPPFLAGS += -DTEXT_BASE=$(TEXT_BASE)
CFLAGS += -D__blackfin__
# -Ttext $(TEXT_BASE)
KALLSYMS += --symbol-prefix=_

2
arch/ppc/Makefile
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@ -14,7 +14,7 @@ cpu-$(CONFIG_ARCH_MPC5200) := mpc5xxx
TEXT_BASE = $(CONFIG_TEXT_BASE)
CPPFLAGS += -DTEXT_BASE=$(TEXT_BASE) -P
CPPFLAGS += -DTEXT_BASE=$(TEXT_BASE)
# Add cleanup flags
ifndef CONFIG_MODULES

1
arch/sandbox/Makefile
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@ -10,7 +10,6 @@ lds-y := $(BOARD)/barebox.lds
TEXT_BASE = $(CONFIG_TEXT_BASE)
CPPFLAGS += -P
CFLAGS += -Dmalloc=barebox_malloc \
-Dfree=barebox_free -Drealloc=barebox_realloc \
-Dread=barebox_read -Dwrite=barebox_write \

1
arch/sandbox/os/Makefile
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@ -8,7 +8,6 @@ else
CPPFLAGS = $(patsubst %,-I$(srctree)/%include,$(machdirs))
endif
CPPFLAGS += -P
CFLAGS := -Wall
NOSTDINC_FLAGS :=

2
arch/x86/Makefile
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@ -5,7 +5,7 @@ machine-y := i386
TEXT_BASE = $(CONFIG_TEXT_BASE)
CPPFLAGS += -march=i386 -m32 -DTEXT_BASE=$(TEXT_BASE) -P
CPPFLAGS += -march=i386 -m32 -DTEXT_BASE=$(TEXT_BASE)
LDFLAGS += -m elf_i386
ifndef CONFIG_MODULES

2
scripts/Makefile.build
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@ -244,7 +244,7 @@ targets += $(extra-y) $(MAKECMDGOALS) $(always)
# Linker scripts preprocessor (.lds.S -> .lds)
# ---------------------------------------------------------------------------
quiet_cmd_cpp_lds_S = LDS $@
cmd_cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ -o $@ $<
cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -D__ASSEMBLY__ -o $@ $<
%.lds: %.lds.S FORCE
$(call if_changed_dep,cpp_lds_S)