[Bug binutils/20957] New: dlltool: syntax error in def file libstdc++-6.def:0

[kdmarshall at mailinator dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=20957

            Bug ID: 20957
           Summary: dlltool: syntax error in def file libstdc++-6.def:0
           Product: binutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: kdmarshall at mailinator dot com
  Target Milestone: ---

I tripped over this, while trying to regenerate an (apparently) defective
libstdc++.dll.a import library, originally created during GCC-5.3.0 cross
compiler build; it appears to be another manifestation of a parse error,
similar but not identical to bug 13657.  I reduced it to:

 $ cat foo.def
 LIBRARY libstdc++-6.dll
 EXPORTS
 _foo

 $ mingw32-dlltool --as mingw32-as --input-def foo.def --output-lib foo.dll.a
 ++mingw32-dlltool: Syntax error in def file foo.def:0

Notice the '++' prefixed to the diagnostic message; these seem to be residual
input, unconsumed by the (lex?) scanner, while processing the LIBRARY spec
within the def file.  If I remove those '++' chars from the library name, then
the LIBRARY spec is parsed successfully, but the DLL name is recorded
(incorrectly) as 'libstdc-6.dll', within the generated import library. 
Alternatively, I can work around this bug by deleting the (valid and correct)
LIBRARY spec from the def file, and instead adding '--dllname libstdc++-6.dll'
as a command line option, but I guess you would want to fix the underlying bug.

FWIW, I see exactly the same manifestation of this bug with every version of
dlltool which I have to hand, in various corners of my file system, namely:

 binutils-2.21
 binutils-2.23.1
 binutils-2.24
 binutils-2.26.20160125

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