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Re: 1.5.19-4 g++ error: can't find entry point in cygwin1.dll

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> From: "Eric Blake" <ebb9 AT byu DOT net>
                          ^^^^   ^^^^^
> According to Anton Korneev on 3/20/2006 8:08 PM:
>>>>   cc1plus.exe - Entry Point not found
>>>>   The procedure entry point _impure_ptr could not be located in the
>>>>   dynamic link library cygwin1.dll.
>>>>   But, with the old versions (1.5.16) I don't have such problem.
> Without the information requested here:
>>>> Problem reports:
> (including the output of 'cygcheck -svr' as a text attachment), we can
> only guess.  But it would appear that you did not fully install the new
> cygwin, or that an older cygwin1.dll is floating around somewhere in your
> system; and that during the upgrade you picked up the newer g++ that
> depends on the newer cygwin.  Be sure you only have one copy of
> cygwin1.dll on your machine, and that all cygwin processes are stopped,
> before reusing setup.exe to reinstall the cygwin package for the correct
> cygwin1.dll.

According to Alastair McDonald on 3/21/2006 8:16 AM:
> I suspect that you need to recompile g++ under 1.5.19 so that it finds the
> correct entry points in the new cygwin.dll.

And quit spreading misinformation.  Cygwin strives for backwards
compatibility (older apps linked against newer cygwin1.dll will continue
to work without recompilation of the older app).  The error was from the
reverse direction - the OP had a newer g++ trying to link against an older
cygwin1.dll because he had multiple copies in his filesystem.

- --
Life is short - so eat dessert first!

Eric Blake   
Version: GnuPG v1.4.2.1 (Cygwin)
Comment: Public key at
Comment: Using GnuPG with Mozilla -


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