[Bug target/60481] [4.9 Regression] Missing diagnostic "ISO C++ forbids declaration of 'foo' with no type"

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60481

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I think you need -fno-ms-extensions, which may be on by default for mingw