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Subject[PATCH 4.18 086/123] x86: Allow generating user-space headers without a compiler
Date
4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ben Hutchings <ben@decadent.org.uk>

commit 829fe4aa9ac16417a904ad1de1307de906854bcf upstream.

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: e501ce957a78 ("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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
arch/x86/Makefile | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)

--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -180,10 +180,6 @@ ifdef CONFIG_FUNCTION_GRAPH_TRACER
endif
endif

-ifndef CC_HAVE_ASM_GOTO
- $(error Compiler lacks asm-goto support.)
-endif
-
#
# Jump labels need '-maccumulate-outgoing-args' for gcc < 4.5.2 to prevent a
# GCC bug (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=46226). There's no way
@@ -317,6 +313,13 @@ 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

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