Bug 1235132 introduced a few problems on mingw: - linker invocation used UNIX-style (-Wl,--version-script,), while the proper way to pass .def file on mingw is just the file name. - generate_symbols_file.py generated UNIX-style scripts. This is fixed by reordering the code. - GCC recognizes .def files by file extensions (and AFAIK there is no way to explicitly tell GCC to treat given file as .def file). I changed generated file name use .def extension. Here is try build: https://treeherder.mozilla.org/#/jobs?repo=try&revision=fa42ce541ca2

Comment on attachment 8707864 [details] [diff] [review] fix Review of attachment 8707864 [details] [diff] [review]: ----------------------------------------------------------------- ::: python/mozbuild/mozbuild/frontend/data.py @@ +497,5 @@ > else: > self.soname = self.lib_name > > if symbols_file: > + self.symbols_file = '%s.def' % self.lib_name Please make this windows-only.

Thanks for review. Try pushed: https://treeherder.mozilla.org/#/jobs?repo=try&revision=7c0857152ec0