https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38534
--- Comment #40 from Lukas Grätz <lukas.gra...@tu-darmstadt.de> --- (In reply to Jakub Jelinek from comment #30) > (In reply to Lukas Grätz from comment #29) > > I belief this could and should be somehow be fixed by adding DWARF info that > > certain callee-saved registers (= the function parameter values) were > > overwritten. The corrected backtrace could look something like this: > > That can be arranged by emitting those .cfi_undefined directives... > > > #2 0x00000000004011d2 in baz (a=42, b=43, c=44, d=<optimised out>, > > e=<optimised out>, f=<optimised out>, g=48, h=49) at /tmp/1.c:38 > > ... but really will not help users to debug/fix their code. > It seems that the reason for <optimized out> is ultimately -Og, not this patch. See Bug 78685. When compiling and debugging your program with -O0 instead, there is not a single <optimized out>.
