[Bug debug/101669] error reading variable from debug information when compiling with -O2

[guojiufu at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101669

--- Comment #2 from Jiu Fu Guo <guojiufu at gcc dot gnu.org> ---
Similar to what Richard said,  tested with gdb, use -gdwarf-4 with trunk, the
msg also disappears.