I have no idea why this is necessary, but remove *.sent when running make mostlyclean, for https://gcc.gnu.org/PR81548. Bootstrapped on x86_64-pc-linux-gnu. Committed to mainline.
Ian 2017-07-26 Ian Lance Taylor <i...@golang.org> PR go/81548 * Makefile.am (MOSTLYCLEANFILES): Add *.sent. * Makefile.in: Rebuild.
Index: Makefile.am =================================================================== --- Makefile.am (revision 250406) +++ Makefile.am (working copy) @@ -109,7 +109,7 @@ s-zdefaultcc: Makefile MOSTLYCLEANFILES = \ zdefaultcc.go s-zdefaultcc \ - check-gccgo gotools.head *-testlog gotools.sum gotools.log + check-gccgo gotools.head *-testlog gotools.sum gotools.log *.sent mostlyclean-local: rm -rf check-go-dir check-runtime-dir cgo-test-dir carchive-test-dir