> To: anaeem...@hotmail.com
> CC: dp...@postgresql.org; z-sa...@guitar.ocn.ne.jp;
> pgsql-hackers@postgresql.org
> Subject: Re: [HACKERS] UUIDs generated using ossp-uuid on windows not unique
> Date: Tue, 30 Mar 2010 10:01:50 -0400
> From: t...@sss.pgh.pa.us
>
> MUHAMMAD ASIF <anaeem...@hotmail.com> writes:
> > I have downloaded uuid-1.6.2.tar.gz from http://www.ossp.org/pkg/lib/uuid/
> > . It successfully built with MinGW gcc and made libuuid.a, I renamed it to
> > uuid.lib to build uuid-ossp contrib module with visual studio 2005.
> > uuid-ossp give the following linker error with VC2005 i.e.
> >
> > Linking...
> > Creating library Release\uuid-ossp\uuid-ossp.lib and object
> > Release\uuid-ossp\uuid-ossp.exp
> > uuid.lib(uuid_time.o) : error LNK2019: unresolved external symbol
> > ___divdi3 referenced in function _uuid_time_gettimeofday
> > uuid.lib(uuid_time.o) : error LNK2019: unresolved external symbol
> > ___moddi3 referenced in function _uuid_time_gettimeofday
> > uuid.lib(uuid_str.o) : error LNK2019: unresolved external symbol
> > ___umoddi3 referenced in function _fmtint
> > uuid.lib(uuid_str.o) : error LNK2019: unresolved external symbol
> > ___udivdi3 referenced in function _fmtint
> > .\Release\uuid-ossp\uuid-ossp.dll : fatal error LNK1120: 4 unresolved
> > externals
>
> Generally, gcc is supposed to arrange for -lgcc to be included
> automatically in links if it's needed. I have seen failures like this
> before on other platforms, and it generally had something to do with
> using gcc followed by a non-gnu linker; which indeed seems to describe
> what you did here. I would suggest adding -lgcc to your VC project;
> or maybe where it actually went missing was in your build of libuuid.
>
you are right its not good idea to generate binary with non compatible tools
that may lead to unexpected results and could make debugging worse.
> > MinGW libgcc.a contains these symbols and these routines are not
> > implemented in c ( its assembly code to make it fast ) so I extracted
> > _divdi3.o _moddi3.o _umoddi3.o _udivdi3.o (we can add these additional
> > files to uuid.lib to make build easy) from libgcc.a and link it with
> > uuid-ossp contrib.
>
> This seems entirely inappropriate; it makes unwarranted assumptions
> about which parts of libgcc are needed, and we couldn't ship any such
> thing anyhow for license reasons.
>
> regards, tom lane
I dont know much about licencing , I was assuming that if we can create
application with gcc then we can use parts of gcc according to our will too.
that was a wrong assumption, thank you for details :).
Best Regards,
Asif Naeem
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