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In command-line tools, ordinary filenames normally do not have special-cased meanings, so commit 3ef742eb "Don't skip dbus-codegen tests on Win32" was a command-line API break: in the unlikely event that a user wanted to write to a file named exactly `stdout`, this would have been an incompatible change. There is a conventional pseudo-filename to represent standard output, which is `-` (for example `cat -` is a no-op filter). Adding support for this is technically also a command-line API break (in the very unlikely event that a user wants to write to a file named exactly `-`, they would now have to write it as `./-`), but filenames starting with a dash often require special treatment anyway, so this probably will not come as a surprise to anyone. When the output filename is `-` we don't want to use `#ifdef _____` as a header guard, so special-case it as `__STDOUT__` as before. Signed-off-by: Simon McVittie <smcv@collabora.com>