On Mon, 2018-02-12 at 13:48 +0100, Peter Zijlstra wrote: > --- a/Makefile > +++ b/Makefile > @@ -486,6 +486,11 @@ KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG > KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) > endif > > +ifneq ($(call cc-option,-mindirect-branch=thunk-extern > -mindirect-branch-register),) > + CC_HAS_RETPOLINE := 1 > +endif > +export CC_HAS_RETPOLINE
Can't you do that with the existing check in arch/x86/Makefile? cf. http://git.infradead.org/users/dwmw2/linux-retpoline.git/commitdiff/eb12299ed which is going nowhere until https://bugs.llvm.org/show_bug.cgi?id=36329 gets fixed but still I'd like to have the check in *one* place.
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