https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102523
Bug ID: 102523
Summary: Assume -fvar-tracking -fvar-tracking-assignments when
compiling with -O0 -g
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
Assignee: unassigned at gcc dot gnu.org
Reporter: woodard at redhat dot com
Target Milestone: ---
One problem that I have run into over and over with developers that I support
is they think that -O0 will generate the easiest to debug code. I've been
trying to educate them to use -Og but the issue comes up over and over and over
again.
I have two proposals which could help this problem and improve GCC's usability
and reduce the time that those of us who support developers must spend
educating people:
When the compiler flags include "-O0" and "-g" print out a warning along the
lines of:
"GCC Warning: debug information will be degraded by the disabling all
optimization passes. Consider -Og instead."
However, many people never see warnings another proposal is when -O0 and -g are
both specified automatically assume -fvar-tracking -fvar-tracking-assignments
That would minimize the number of problems that people run into.
Either approach would be an improvement in GCC's usability and help avoid a
trap that far too many developers seem to fall into.
