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@xxxxxxxxx> > Acked-by: Ian Rogers <irogers@xxxxxxxxxx> > Cc: linux-toolchains@xxxxxxxxxxxxxxx > Cc: Andi Kleen <andi@xxxxxxxxxxxxxx> > Cc: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> > Cc: Segher Boessenkool <segher@xxxxxxxxxxxxxxxxxxx> > Cc: Florian Weimer <fw@xxxxxxxxxxxxx> Reviewed-by: Andi Kleen <ak@xxxxxxxxxxxxxxx> -Andi
