https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70955
zenith432 at users dot sourceforge.net changed: What |Removed |Added ---------------------------------------------------------------------------- Component|c |target --- Comment #3 from zenith432 at users dot sourceforge.net --- This only happens when compiling with -flto. Attached is a standalone sample (va_main.c + va_test.c) gcc -v COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/6.1.1/lto-wrapper Target: x86_64-redhat-linux Configured with: ../configure --enable-bootstrap --enable-languages=c,c++,objc,obj-c++,fortran,ada,go,lto --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared --enable-threads=posix --enable-checking=release --enable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-linker-hash-style=gnu --enable-plugin --enable-initfini-array --disable-libgcj --with-isl --enable-libmpx --enable-gnu-indirect-function --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux Thread model: posix gcc version 6.1.1 20160427 (Red Hat 6.1.1-1) (GCC) gcc -o prog va_main.c va_test.c ./prog sum == 15 gcc -o prog_flto -flto va_main.c va_test.c ./prog_flto Segmentation fault (core dumped)