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authorAlexey Brodkin <Alexey.Brodkin@synopsys.com>2019-06-03 09:31:19 +0300
committerVineet Gupta <vgupta@synopsys.com>2019-06-11 11:48:34 -0700
commit2bc42bfba9b247abd93991195b71f35a484531d1 (patch)
parentd1fdb6d8f6a4109a4263176c84b899076a5f8008 (diff)
ARC: build: Try to guess CROSS_COMPILE with cc-cross-prefix
For a long time we used to hard-code CROSS_COMPILE prefix for ARC until it started to cause problems, so we decided to solely rely on CROSS_COMPILE externally set by a user: commit 40660f1fcee8 ("ARC: build: Don't set CROSS_COMPILE in arch's Makefile"). While it works perfectly fine for build-systems where the prefix gets defined anyways for us human beings it's quite an annoying requirement especially given most of time the same one prefix "arc-linux-" is all what we need. It looks like finally we're getting the best of both worlds: 1. W/o cross-toolchain we still may install headers, build .dtb etc 2. W/ cross-toolchain get the kerne built with only ARCH=arc Inspired by [1] & [2]. [1] http://lists.infradead.org/pipermail/linux-snps-arc/2019-May/005788.html [2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fc2b47b55f17 A side note: even though "cc-cross-prefix" does its job it pollutes console with output of "which" for all the prefixes it didn't manage to find a matching cross-compiler for like that: | # ARCH=arc make defconfig | which: no arceb-linux-gcc in (~/.local/bin:~/bin:/usr/bin:/usr/sbin) | *** Default configuration is based on 'nsim_hs_defconfig' Suggested-by: Vineet Gupta <vgupta@synopsys.com> Reviewed-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arc/Makefile b/arch/arc/Makefile
index e2b991f75bc5..9cfd2ba7a12d 100644
--- a/arch/arc/Makefile
+++ b/arch/arc/Makefile
@@ -8,6 +8,10 @@
KBUILD_DEFCONFIG := nsim_hs_defconfig
+ifeq ($(CROSS_COMPILE),)
+CROSS_COMPILE := $(call cc-cross-prefix, arc-linux- arceb-linux-)
cflags-y += -fno-common -pipe -fno-builtin -mmedium-calls -D__linux__
cflags-$(CONFIG_ISA_ARCOMPACT) += -mA7
cflags-$(CONFIG_ISA_ARCV2) += -mcpu=hs38