Messages in this thread | | | Date | Wed, 14 Oct 2020 08:17:01 -0700 | From | Andi Kleen <> | Subject | Re: [PATCH] Only add -fno-var-tracking-assignments workaround for old GCC versions. |
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On Wed, Oct 14, 2020 at 01:01:32PM +0200, Mark Wielaard wrote: > Some old GCC versions between 4.5.0 and 4.9.1 might miscompile code > with -fvar-tracking-assingments (which is enabled by default with -g -O2). > commit 2062afb4f added -fno-var-tracking-assignments unconditionally to > work around this. But newer versions of GCC no longer have this bug, so > only add it for versions of GCC before 5.0.
Add
... This allows various tools such as a perf probe or gdb debuggers or systemtap to resolve variable locations using dwarf locations in more code. > > Signed-off-by: Mark Wielaard <mark@klomp.org> > Acked-by: Ian Rogers <irogers@google.com> > Cc: linux-toolchains@vger.kernel.org > Cc: Andi Kleen <andi@firstfloor.org> > Cc: Nick Desaulniers <ndesaulniers@google.com> > Cc: Segher Boessenkool <segher@kernel.crashing.org> > Cc: Florian Weimer <fw@deneb.enyo.de>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
-Andi
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