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Date: Sat, 10 Oct 2009 12:51:37 +0100 From: Vincent Sanders <vince@...tec.co.uk> To: linux-kernel@...r.kernel.org Cc: Vincent Sanders <vince@...tec.co.uk> Subject: [PATCH] Alter the way dependancy file generation is passed to the toolchain. The kernel currently generates its dependency files using a direct -Wp switch to bypass the compiler driver and access the preprocessor. This is unnecessary on any GCC the kernel can be built with. This approach is also discouraged in the GCC documentation. A nice side effect of this change is that it allows clang/llvm to build the kernel. Signed-off-by: Vincent Sanders <vince@...tec.co.uk> --- Makefile | 2 +- arch/powerpc/boot/Makefile | 4 ++-- arch/um/scripts/Makefile.rules | 4 ++-- drivers/net/wan/Makefile | 2 +- scripts/Makefile.host | 4 ++-- scripts/Makefile.lib | 6 +++--- 6 files changed, 11 insertions(+), 11 deletions(-) diff --git a/Makefile b/Makefile index e50569a..f3d552c 100644 --- a/Makefile +++ b/Makefile @@ -1605,7 +1605,7 @@ quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) -a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \ +a_flags = -MD -MF $(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \ $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \ $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o) diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile index 7bfc8ad..4e9b06f 100644 --- a/arch/powerpc/boot/Makefile +++ b/arch/powerpc/boot/Makefile @@ -119,10 +119,10 @@ clean-files := $(zlib) $(zlibheader) $(zliblinuxheader) \ empty.c zImage.coff.lds zImage.ps3.lds zImage.lds quiet_cmd_bootcc = BOOTCC $@ - cmd_bootcc = $(CROSS32CC) -Wp,-MD,$(depfile) $(BOOTCFLAGS) -c -o $@ $< + cmd_bootcc = $(CROSS32CC) -MD -MF $(depfile) $(BOOTCFLAGS) -c -o $@ $< quiet_cmd_bootas = BOOTAS $@ - cmd_bootas = $(CROSS32CC) -Wp,-MD,$(depfile) $(BOOTAFLAGS) -c -o $@ $< + cmd_bootas = $(CROSS32CC) -MD -MF $(depfile) $(BOOTAFLAGS) -c -o $@ $< quiet_cmd_bootar = BOOTAR $@ cmd_bootar = $(CROSS32AR) -cr $@...$$ $(filter-out FORCE,$^); mv $@...$$ $@ diff --git a/arch/um/scripts/Makefile.rules b/arch/um/scripts/Makefile.rules index 61107b6..71c0bc3 100644 --- a/arch/um/scripts/Makefile.rules +++ b/arch/um/scripts/Makefile.rules @@ -8,7 +8,7 @@ USER_OBJS += $(filter %_user.o,$(obj-y) $(obj-m) $(USER_SINGLE_OBJS)) USER_OBJS := $(foreach file,$(USER_OBJS),$(obj)/$(file)) $(USER_OBJS:.o=.%): \ - c_flags = -Wp,-MD,$(depfile) $(USER_CFLAGS) $(CFLAGS_$(basetarget).o) + c_flags = -MD -MF $(depfile) $(USER_CFLAGS) $(CFLAGS_$(basetarget).o) $(USER_OBJS) : CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ \ -Dunix -D__unix__ -D__$(SUBARCH)__ $(CF) @@ -17,7 +17,7 @@ $(USER_OBJS) : CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ \ UNPROFILE_OBJS := $(foreach file,$(UNPROFILE_OBJS),$(obj)/$(file)) $(UNPROFILE_OBJS:.o=.%): \ - c_flags = -Wp,-MD,$(depfile) $(call unprofile,$(USER_CFLAGS)) $(CFLAGS_$(basetarget).o) + c_flags = -MD -MF $(depfile) $(call unprofile,$(USER_CFLAGS)) $(CFLAGS_$(basetarget).o) $(UNPROFILE_OBJS) : CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ \ -Dunix -D__unix__ -D__$(SUBARCH)__ $(CF) diff --git a/drivers/net/wan/Makefile b/drivers/net/wan/Makefile index 19d14bc..3211b72 100644 --- a/drivers/net/wan/Makefile +++ b/drivers/net/wan/Makefile @@ -57,7 +57,7 @@ endif quiet_cmd_build_wanxlfw = BLD FW $@ cmd_build_wanxlfw = \ - $(CPP) -Wp,-MD,$(depfile) -I$(srctree)/include $< | $(AS68K) -m68360 -o $(obj)/wanxlfw.o; \ + $(CPP) -MD -MF $(depfile) -I$(srctree)/include $< | $(AS68K) -m68360 -o $(obj)/wanxlfw.o; \ $(LD68K) --oformat binary -Ttext 0x1000 $(obj)/wanxlfw.o -o $(obj)/wanxlfw.bin; \ hexdump -ve '"\n" 16/1 "0x%02X,"' $(obj)/wanxlfw.bin | sed 's/0x ,//g;1s/^/static u8 firmware[]={/;$$s/,$$/\n};\n/' >$(obj)/wanxlfw.inc; \ rm -f $(obj)/wanxlfw.bin $(obj)/wanxlfw.o diff --git a/scripts/Makefile.host b/scripts/Makefile.host index 1ac414f..d673e19 100644 --- a/scripts/Makefile.host +++ b/scripts/Makefile.host @@ -103,8 +103,8 @@ __hostc_flags = -I$(obj) $(call flags,_hostc_flags) __hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags) endif -hostc_flags = -Wp,-MD,$(depfile) $(__hostc_flags) -hostcxx_flags = -Wp,-MD,$(depfile) $(__hostcxx_flags) +hostc_flags = -MD -MF $(depfile) $(__hostc_flags) +hostcxx_flags = -MD -MF $(depfile) $(__hostcxx_flags) ##### # Compile programs on the host diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib index 7a77787..5488a9f 100644 --- a/scripts/Makefile.lib +++ b/scripts/Makefile.lib @@ -145,15 +145,15 @@ __a_flags = $(call flags,_a_flags) __cpp_flags = $(call flags,_cpp_flags) endif -c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ +c_flags = -MD -MF $(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ $(__c_flags) $(modkern_cflags) \ -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags) \ $(debug_flags) -a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ +a_flags = -MD -MF $(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ $(__a_flags) $(modkern_aflags) -cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ +cpp_flags = -MD -MF $(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ $(__cpp_flags) ld_flags = $(LDFLAGS) $(ldflags-y) -- 1.6.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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