https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69506
--- Comment #3 from Roger Orr <rogero at howzatt dot demon.co.uk> --- Tested: bootstrap build on cygwin with your patch completed successfully. I used: ../gcctrunk/configure --enable-languages=c,c++ --prefix=/usr/share/gcc-trunk make -j5 make install Thank you :-)