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x86: Allow generating user-space headers without a compiler 

When bootstrapping an architecture, it's usual to generate the kernel's
user-space headers (make headers_install) before building a compiler.  Move
the compiler check (for asm goto support) to the archprepare target so that
it is only done when building code for the target.

Fixes: e501ce957a ("x86: Force asm-goto")
Reported-by: Helmut Grohne <helmutg@debian.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20180829194317.GA4765@decadent.org.uk
This commit is contained in:
Ben Hutchings 2018-08-29 20:43:17 +01:00 committed by Thomas Gleixner
parent 342db04ae7
commit 829fe4aa9a
1 changed files with 7 additions and 4 deletions
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11
arch/x86/Makefile
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@ -175,10 +175,6 @@ ifdef CONFIG_FUNCTION_GRAPH_TRACER
endif
endif
ifndef CC_HAVE_ASM_GOTO
$(error Compiler lacks asm-goto support.)
endif
ifeq ($(ACCUMULATE_OUTGOING_ARGS), 1)
# This compiler flag is not supported by Clang:
KBUILD_CFLAGS += $(call cc-option,-maccumulate-outgoing-args,)
@ -300,6 +296,13 @@ PHONY += vdso_install
vdso_install:
$(Q)$(MAKE) $(build)=arch/x86/entry/vdso $@
archprepare: checkbin
checkbin:
ifndef CC_HAVE_ASM_GOTO
@echo Compiler lacks asm-goto support.
@exit 1
endif
archclean:
$(Q)rm -rf $(objtree)/arch/i386
$(Q)rm -rf $(objtree)/arch/x86_64