On Wed, Oct 17, 2018 at 02:33:02PM +0000, Alexey Brodkin wrote: > Hello, > > > -----Original Message----- > > From: Alexey Brodkin [mailto:abrodkin at synopsys.com] > > Sent: Sunday, September 16, 2018 11:48 PM > > To: linux-snps-arc at lists.infradead.org > > Cc: linux-kernel at vger.kernel.org; Vineet Gupta <vgupta at synopsys.com>; Alexey Brodkin <abrodkin at synopsys.com>; Masahiro > > Yamada <yamada.masahiro at socionext.com>; Rob Herring <robh at kernel.org> > > Subject: [PATCH] ARC: Don't set CROSS_COMPILE in arch's Makefile > > > > There's not much sense in doing that because if user or > > his build-system didn't set CROSS_COMPILE we still may > > very well make incorrect guess. > > > > But as it turned out setting CROSS_COMPILE is not as harmless > > as one may think: with recent changes that implemented automatic > > discovery of __host__ gcc features unconditional setup of > > CROSS_COMPILE leads to failures on execution of "make xxx_defconfig" > > with absent cross-compiler, for more info see [1]. > > > > Set CROSS_COMPILE as well gets in the way if we want only to build > > .dtb's (again with absent cross-compiler which is not really needed > > for building .dtb's), see [2]. > > > > Note, we had to change LIBGCC assignment type from ":=" to "=" > > so that is is resolved on its usage, otherwise if it is resolved > > at declaration time with missing CROSS_COMPILE we're getting this > > error message from host GCC: > > ------------------------->8------------------------- > > gcc: error: unrecognized command line option ?-mmedium-calls? > > gcc: error: unrecognized command line option ?-mno-sdata?; did you mean ?-fno-stats?? > > ------------------------->8------------------------- > > > > [1] http://lists.infradead.org/pipermail/linux-snps-arc/2018-September/004308.html > > [2] http://lists.infradead.org/pipermail/linux-snps-arc/2018-September/004320.html > > > > Signed-off-by: Alexey Brodkin <abrodkin at synopsys.com> > > Cc: Masahiro Yamada <yamada.masahiro at socionext.com> > > Cc: Rob Herring <robh at kernel.org> > > --- > > arch/arc/Makefile | 10 +--------- > > 1 file changed, 1 insertion(+), 9 deletions(-) > > > > diff --git a/arch/arc/Makefile b/arch/arc/Makefile > > index 99cce77ab98f..5f6b67917dc2 100644 > > --- a/arch/arc/Makefile > > +++ b/arch/arc/Makefile > > @@ -6,14 +6,6 @@ > > # published by the Free Software Foundation. > > # > > > > -ifeq ($(CROSS_COMPILE),) > > -ifndef CONFIG_CPU_BIG_ENDIAN > > -CROSS_COMPILE := arc-linux- > > -else > > -CROSS_COMPILE := arceb-linux- > > -endif > > -endif > > - > > KBUILD_DEFCONFIG := nsim_700_defconfig > > > > cflags-y += -fno-common -pipe -fno-builtin -mmedium-calls -D__linux__ > > @@ -79,7 +71,7 @@ cflags-$(disable_small_data) += -mno-sdata -fcall-used-gp > > cflags-$(CONFIG_CPU_BIG_ENDIAN) += -mbig-endian > > ldflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB > > > > -LIBGCC := $(shell $(CC) $(cflags-y) --print-libgcc-file-name) > > +LIBGCC = $(shell $(CC) $(cflags-y) --print-libgcc-file-name) > > > > # Modules with short calls might break for calls into builtin-kernel > > KBUILD_CFLAGS_MODULE += -mlong-calls -mno-millicode > > -- > > 2.17.1 > > May we have this one back-ported to stable branches? > > Upstream commit in Linus' tree is: > 40660f1fcee8 ("ARC: build: Don't set CROSS_COMPILE in arch's Makefile"). Applied to 4.9.y, 4.14.y, and 4.18.y, thanks. greg k-h
