Hello,
-----Original Message----- From: Alexey Brodkin [mailto:abrodkin@synopsys.com] Sent: Sunday, September 16, 2018 11:48 PM To: linux-snps-arc@lists.infradead.org Cc: linux-kernel@vger.kernel.org; Vineet Gupta vgupta@synopsys.com; Alexey Brodkin abrodkin@synopsys.com; Masahiro Yamada yamada.masahiro@socionext.com; Rob Herring robh@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.ht... [2] http://lists.infradead.org/pipermail/linux-snps-arc/2018-September/004320.ht...
Signed-off-by: Alexey Brodkin abrodkin@synopsys.com Cc: Masahiro Yamada yamada.masahiro@socionext.com Cc: Rob Herring robh@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").
Regards, Alexey