robert at linuxfromscratch.org
Sat May 15 16:42:32 PDT 2010
On Friday May 14 2010 11:23:13 pm robert baker wrote:
> I went ahead and did some checking on the compiler warnings that
> binutils produces. There are 27 warnings that come from
> binutils-2.19.51 (we already use --disable-werror in the book). There
> are 30 warnings that come from binutils-2.20.
> The three additional warnings that are produced are as follows:
> syslex.c:1271: warning: 'yyunput' defined but not used
> arlex.c:1396: warning: 'yyunput' defined but not used
> ldlex.c:3362: warning: 'yyunput' defined but not used
> yyunput is not defined by any code added by the pax patch. In fact
> none of the warnings in either build are a result of the pax patch.
> When compiling without the patch the warnings are exactly the same. As
> such I don't see much reason for holding back on binutils-2.20.
> On Fri, May 14, 2010 at 6:16 PM, Robert Connolly
> <robert at linuxfromscratch.org> wrote:
> > Hi.
> > The PaX team doesn't have a patch for binutils-2.20, only for 2.19. The
> > 2.19 patch has several compiler warnings when applied to binutils-2.20.
> > PLD and Gentoo use --disable-werror when building Binutils, use the old
> > patch with binutils-2.20, and ignore the compiler warnings.
> > The only feature in 2.20 that caught my attention was the Gold linker.
> > Gold was developed to perform better than the old BFD linker. The
> > programs that Gold links will perform the same. In gcc-4.5 there are link
> > time optimizations (-flto) with Gold linker plugin support
> > (-fuse-linker-plugin). The -fuse-linker-plugin option is used to extract
> > objects files from static libraries, instead of doing this by hand, for
> > better optimization from -flto. -flto alone doesn't optimize very well,
> > and should be used with -fwhole-program. Not many packages support
> > building with these options, so they will be rarely used for the moment.
> > So, for me personally, there isn't a great deal of reason to upgrade to
> > binutils-2.20, at least until PaX releases a new Binutils patch.
> > Something you might want to discuss or think about.
> > robert
> > --
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This might only be a problem with x86_64. I'm not sure.
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