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<H1>[Mageia-dev] rpmrc [5221] build with -fPIC on x86_64 too (pok, mdv)</H1>
<B>Anssi Hannula</B>
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TITLE="[Mageia-dev] rpmrc [5221] build with -fPIC on x86_64 too (pok, mdv)">anssi at mageia.org
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<I>Thu Jan 10 02:54:33 CET 2013</I>
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<PRE>26.09.2012 22:57, Thierry Vignaud kirjoitti:
><i> On 26 September 2012 20:30, Anssi Hannula <<A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">anssi at mageia.org</A>> wrote:
</I>>>><i> Author
</I>>>><i> tv
</I>>><i>
</I>>>><i> Log Message
</I>>>><i>
</I>>>><i> build with -fPIC on x86_64 too (pok, mdv)
</I>>><i>
</I>>><i> Why?
</I>><i>
</I>><i> "-fPIC should already be used on x86_64 or you'll get sooner or later in
</I>><i> troubles (for instance when linking libs). I think that any sane build
</I>><i> script should already default to -fPIC on x86_64 but some other weird
</I>><i> build script may not." (rtp)
</I>
I have to strongly disagree with this.
- This hides problems in build scripts. Shared libraries should normally
be linked with -fPIC on *all* architectures. Not doing this causes
some issues, like the library to actually become unshareable across
different processes. Since these are allowed in iX86 but not on
x86_64, building all objects on x86_64 with -fPIC will hide any
"missing -fPIC from build script" issues.
Note that there can't be very many problematic failing packages, since
we and mdv have managed this far without it.
- It is not needed except on shared libraries, and will cause a small
performance penalty (due to one less register being available when
using relative addressing). (AFAIU it is negligible, but still..)
- Other major distros (not counting MDV) do not do this
--
Anssi Hannula
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