Re: libevent and PIC

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02-22-2008, 11:51 AM

Theo de Raadt

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Re: libevent and PIC

> Is there a reason there's no version of libevent installed with PIC, or is
> an oversight? I'm on an AMD64 (3.7) trying to build a Perl module which
> wraps libevent and it don't work;
>
> $ make
> cp lib/Event/Lib.pm blib/lib/Event/Lib.pm
> /usr/bin/perl /usr/libdata/perl5/ExtUtils/xsubpp -typemap /usr/libdata/perl5/ExtUtils/typemap -typemap typemap Lib.xs > Lib.xsc && mv Lib.xsc Lib.c
> cc -c -fno-strict-aliasing -fno-delete-null-pointer-checks -pipe -I/usr/local/include -O2 -DVERSION=\"0.09\" -DXS_VERSION=\"0.09\" -DPIC -fPIC "-I/usr/libdata/perl5/amd64-openbsd/5.8.6/CORE" -DHAVE_CONFIG_H Lib.c
> Running Mkbootstrap for Event::Lib ()
> chmod 644 Lib.bs
> rm -f blib/arch/auto/Event/Lib/Lib.so
> LD_RUN_PATH="" cc -shared -fPIC Lib.o -o blib/arch/auto/Event/Lib/Lib.so -levent -lm
> /usr/bin/ld: /usr/lib/libevent.a(event.o): relocation R_X86_64_32 can not be used when making a shared object; recompile with -fPIC
> /usr/lib/libevent.a: could not read symbols: Bad value
> collect2: ld returned 1 exit status
> *** Error code 1
>
> Stop in /usr/local/src/Event-Lib-0.09 (line 451 of Makefile).

It is a 31K library.

If you made it into a PIC library, it would use at least 5x as much
address space.

And PIC libraries are slower.

So what's the point?

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Re: libevent and PIC