https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79677
--- Comment #8 from Orion Poplawski <orion at cora dot nwra.com> --- Created attachment 40838 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40838&action=edit /builddir/build/BUILD/cmake-3.7.2/Utilities/KWIML/test/test.c /usr/lib64/ccache/gcc -DKWIML_LANGUAGE_C -DKWIML_LANGUAGE_CXX -I/builddir/build/BUILD/cmake-3.7.2/build/Utilities -I/builddir/build/BUILD/cmake-3.7.2/Utilities -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m64 -mtune=generic -Wno-format -std=gnu11 -o CMakeFiles/kwiml_test.dir/test.c.o -c /builddir/build/BUILD/cmake-3.7.2/Utilities/KWIML/test/test.c cc1: error: -Wformat-security ignored without -Wformat [-Werror=format-security] cc1: some warnings being treated as errors I don't see any extra options myself.