Re: [gentoo-hardened] removing .text relocations from mplayer and xine-lib

[Peter S. Mazinger]

On Mon, 30 May 2005, René Rhéaume wrote:

> I found out symlinking libtool-nofpic to libtool (which produces PIC
> binaries) eliminates most of the relocations. I am able to build on
> Gentoo either outside Portage or using my custom ebuild.
>
> Just add "use x86 && has_pic && ln -sf libtool ${S}/libtool-nofpic"
> right after econf. You can also comment RESTRICT="nostrip" in the
> ebuild and add "strict" to your FEATURES to get the list of the
> remaining TEXTREL binaries, which are on my system:

Better yet, add --enable-fpic to econf. The change proposed above w/ the 
link is allowed conditionally, if use has_pic && use x86 (probably amd64 
too)
 
> $(get-libdir)/xine/plugins/${PV}/post/xineplug_post_{planar,tvtime}.so
> $(get-libdir)/xine/plugins/${PV}/xineplug_decode_{ff,w32dll,qt}.so

xineplug_decode_ff.so is clean as of 1.0.1, I remove the rest from the 
system, else xine-lib fails to load (see original bug-report, failure on 
planar)

>
> Feedback from other architectures is appreciated.
>
> Also, it seems that "use x86 && has_pic && append-flags -UHAVE_MMX" is
> not needed. I can build fine either with or without.

it disables mmx/asm code for any case

>
> *This paragraph is more a note to myself, but can be interesting for
> those with older gcc versions*
> I also tried this symlinking trick on my half-Mandr* install and got
> two build errors (make -k). It is probably a bug from that old
> gcc-3.2-1mdk I get as I already have to patch xine-lib to disable SIMD
> code generation in FAAD code even when I generate non-PIC code.
> Faulty files are:
> ${S}/src/libffmpeg/libavcodec/i386/mpegvideo_mmx_template.c
> ${S}/src/libffmpeg/libavcodec/libpostproc/postprocess_template.c
> Error message: can't find a register in class `GENERAL_REGS' while
> reloading `asm'

see how this is solved in the ffmpeg ebuild, important is to disable 
mmx/asm code.

Peter

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Peter S. Mazinger <ps dot m at gmx dot net>           ID: 0xA5F059F2
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