4.18-stable review patch. If anyone has any objections, please let me know.
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From: Alexey Brodkin abrodkin@synopsys.com
commit 40660f1fcee8d524a60b5101538e42b1f39f106d upstream.
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:
| gcc: error: unrecognized command line option -mmedium-calls | gcc: error: unrecognized command line option -mno-sdata
[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 Signed-off-by: Vineet Gupta vgupta@synopsys.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/arc/Makefile | 10 +--------- 1 file changed, 1 insertion(+), 9 deletions(-)
--- a/arch/arc/Makefile +++ b/arch/arc/Makefile @@ -6,14 +6,6 @@ # published by the Free Software Foundation. #
-ifeq ($(CROSS_COMPILE),) -ifndef CONFIG_CPU_BIG_ENDIAN -CROSS_COMPILE := arc-linux- -else -CROSS_COMPILE := arceb-linux- -endif -endif - KBUILD_DEFCONFIG := nsim_700_defconfig
cflags-y += -fno-common -pipe -fno-builtin -mmedium-calls -D__linux__ @@ -73,7 +65,7 @@ ldflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB # --build-id w/o "-marclinux". Default arc-elf32-ld is OK ldflags-$(upto_gcc44) += -marclinux
-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