https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114454
--- Comment #1 from Ian Lance Taylor <ian at airs dot com> --- I'm not sure what is going on here. The test as such does not require a UTF-8 LANG. That is, I can run the compiler and the test with LANG=C and everything passes. In fact, that is exactly how the GCC testsuite runs the test: the GCC testsuite sets LANG=C before all tests. As best I can tell the problem must be arising somehow in the DejaGNU code. The filenames in the test use UTF-8 non-ASCII characters. But I haven't been able to figure out where the problem is.