[Bug ld/25540] New: using the same filename for MAP and DLL fails silently with file corruption

[draymond at foxvalley dot net]

https://sourceware.org/bugzilla/show_bug.cgi?id=25540

            Bug ID: 25540
           Summary: using the same filename for MAP and DLL fails silently
                    with file corruption
           Product: binutils
           Version: 2.30
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: draymond at foxvalley dot net
  Target Milestone: ---

I discovered this due to an error in my Makefile.  I was using
"-Wl,-Map=$(@:.dll=.map) -o $@" on the command line but the target was foo.pyd
(not foo.dll).  Therefore I inadvertantly specified the same filename for the
map file and the output file.  This caused the linker to fail silently (no
warnings or errors) and generate a corrupt output file.  The section headers
pointed to areas in the file that did not contain the expected sections.

When doing the same thing using lld it succeeds with a valid output file but no
map file is generated.

It would be better for ld to detect the duplicate filename and fail with a
helpful error message or to mimic the behavior of lld.

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