x86_64-pc-linux-gnu-gcc -o prfdcach.o -c -fvisibility=hidden -march=native -pipe -O2 -g0 -Wall -pthread -g -fno-inline -fPIC -UNDEBUG -DDEBUG_portage -DDEBUG=1 -DHAVE_VISIBILITY_HIDDEN_ATTRIBUTE=1 -DHAVE_VISIBILITY_PRAGMA=1 -DXP_UNIX=1 -D_GNU_SOURCE=1 -DHAVE_FCNTL_FILE_LOCKING=1 -DLINUX=1 -DHAVE_LCHOWN=1 -DHAVE_STRERROR=1 -D_REENTRANT=1 -DFORCE_PR_LOG -D_PR_PTHREADS -UHAVE_CVAR_BUILT_ON_SEM -D_NSPR_BUILD_ -I../../../dist/include/nspr -I../../../../mozilla/nsprpub/pr/include -I../../../../mozilla/nsprpub/pr/include/private ../../../../mozilla/nsprpub/pr/src/io/prfdcach.c
you obviously have debug enabled, -DDEBUG_portage -DDEBUG=1 which would result in -g being passed via cflags for debugging purposes, not gonna change in the source.