[Bug gas/23153] gas: distinct input and output files are not properly detected on not-fully-emulated POSIX platforms

[pexu at sourceware dot mail.kapsi.fi]

https://sourceware.org/bugzilla/show_bug.cgi?id=23153

--- Comment #2 from Pekka Seppänen <pexu at sourceware dot mail.kapsi.fi> ---
Hi Nick,

My apologies for a late response; The patch appears to work just fine as
expected.

However, it just occured to me that IEEE Std 1003.1 (2016 edition), i.e. the
POSIX specs, state that ``The st_ino and st_dev fields taken together uniquely
identify the file within the system'' (pg. 392), so I guess the attached patch
shouldn't be applied but one that fails only if the st_dev is the same, too
(and has the non-POSIX compliant quirk workaround enabled way or another).

By the way, the GCC folks simply do not do any stat()s for MinGW targets (so
any compliant system does not get the zero serial number ignored).

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