Messages in this thread | | | Date | Mon, 18 Mar 2019 18:16:04 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH] x86/vdso: include generic __lshrdi3 in 32-bit vDSO |
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On Mon, Mar 18, 2019 at 10:09:37AM -0700, Nick Desaulniers wrote: > On Fri, Mar 15, 2019 at 3:29 PM Matthias Kaehlcke <mka@chromium.org> wrote: > > On Fri, Mar 15, 2019 at 02:31:09PM -0700, 'Nick Desaulniers' via Clang Built Linux wrote: > > > Is there a config I can set to reproduce this, in order to help > > > test? > > > > I encountered it with a Chrome OS specific configuration, but a > > defconfig should do. > > defconfig selects CONFIG_OPTIMIZE_FOR_PERFORMANCE=y. I needed to > select CONFIG_CC_OPTIMIZE_FOR_SIZE=y to repro. My CI is simply > running defconfigs, which is why I didn't catch this.
I suspect the right fix is to make clang use -Os and abolish that -Oz madness.
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