Re: [SPF:fail] Re: <value optimized out> even with gcc -g -O0

On Mon, 01 Feb 2010 07:18:26 +0100, Chuck Anderson wrote: > I'm trying to debug an issue for the upstream author of ocp and am > running into an issue where gdb is showing "<value optimized out>" for > variables even though I've compiled the program with gcc -g -O0. [...] > Compiler excerpts: > > gcc -g -O0 -fPIC -Wall -I.././ -I.././gnulib kickload.c -o kickload.o -c > gcc -g -O0 -fPIC -Wall -I.././ -I.././gnulib compdate.c -o compdate.o -c > ... > gcc -g -O0 -fPIC -Wall -I./ -I./gnulib -o ocp boot/kickload.o -pthread -ldl goodies/helpc/ocphhc doc/opencp.dox ocp.hlp If you list also the mixasm.c compilation line you would find: gcc -g -O0 -fpic -Wall -I.././ -O mixasm.c -o mixasm.o -c as there is explicit -O in dev/Makefile there. After removing it getting a valid dump with no <value optimized out>. For the -O build found one <value optimized out> as correct and one <value optimized out> as some bug in either gdb or gcc but that is out of the scope of this mail thread. -O0 -g works, NOTABUG.