https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85924
--- Comment #1 from Jason Vas Dias <jason.vas.dias at gmail dot com> --- Aha! Sorry, it appears that when run from command line, just the -fPIC option appears, not the -DPIC, but in my make.log for the original GCC build, I do see: checking for shl_load in -ldld... libtool: compile: /home/devel/OS/gcc-6-branch/host-x86_64-linux-gnu/gcc/xgcc -shared-libgcc -B/home/devel/OS/gcc-6-branch/host-x86_64-linux-gnu/gcc -nostdinc++ -L/home/devel/OS/gcc-6-branch/x86_64-linux-gnu/libstdc++-v3/src -L/home/devel/OS/gcc-6-branch/x86_64-linux-gnu/libstdc++-v3/src/.libs -L/home/devel/OS/gcc-6-branch/x86_64-linux-gnu/libstdc++-v3/libsupc++/.libs -B/usr/local/x86_64-linux-gnu/bin/ -B/usr/local/x86_64-linux-gnu/lib/ -isystem /usr/local/x86_64-linux-gnu/include -isystem /usr/local/x86_64-linux-gnu/sys-include -D_GNU_SOURCE -D_DEBUG -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -DASAN_HAS_EXCEPTIONS=1 -DASAN_NEEDS_SEGV=1 -DCAN_SANITIZE_UB=0 -D_OBSTACK_SIZE_T=SIZE_T -I. -I../../.././libsanitizer/asan -I.. -I ../../.././libsanitizer/include -I ../../.././libsanitizer -Wall -W -Wno-unused-parameter -Wwrite-strings -pedantic -Wno-long-long -fPIC -fno-builtin -fno-exceptions -fno-rtti -fomit-frame-pointer -funwind-tables -fvisibility=hidden -Wno-variadic-macros -fno-ipa-icf -I../../libstdc++-v3/include -I../../libstdc++-v3/include/x86_64-linux-gnu -I../../.././libsanitizer/../libstdc++-v3/libsupc++ -std=gnu++11 -g -O2 -D_GNU_SOURCE -MT asan_linux.lo -MD -MP -MF .deps/asan_linux.Tpo -c ../../.././libsanitizer/asan/asan_linux.cc -fPIC -DPIC -o asan_linux.o >/dev/null 2>&1 no checking for dlopen... no So the asan/asan_linux.o object IS getting built with -fPIC -DPIC ! this means instant infinite recursion for every syscall if -static-libasan used.
