[gentoo-alt] Gentoo Prefix on RHEL4 amd64

[Stefan Hoelldampf]

Hi,

right now I'm having some trouble boostrapping Gentoo Prefix on RHEL4
using amd64. The issues I'm experiencing seem to be in the binutils/gcc
area. Both described problems might be related to each other but I'm not
really sure. Anyway, here they are:

1. Using sys-devel/gcc-4.2.4 the bootstrap process is working but e.g.
app-text/poppler-0.10.0 can not be emerged. I traced it down to a
$EPREFIX/usr/lib{,64} problem. r29645 removed the usr/lib64->lib
"multilib" symlink creation in scripts/bootstrap-prefix.sh. Therefore
libtool of poppler can not find $EPREFIX/usr/lib64 and eventually uses
/usr/lib64 (having an old and incompatible version of libfreetype.so in
this case). The following diff shows a formatted output of the library
paths of "gcc -print-search-dirs". The compiler takes $EPREFIX/usr/lib64
only into account which does not exist without the symlink. Therefore
the old system library is used during linking.

> --- normal.log
> +++ with-symlink.log
> @@ -1,23 +1,24 @@
>  $EPREFIX/usr/bin/gcc
>  4.2.4
>  Found: $EPREFIX/usr/lib/gcc/x86_64-pc-linux-gnu/4.2.4/
>  Found: /usr/lib/gcc/x86_64-pc-linux-gnu/4.2.4/
>  Found: $EPREFIX/usr/lib/gcc/x86_64-pc-linux-gnu/4.2.4/../../../../x86_64-pc-linux-gnu/lib/x86_64-pc-linux-gnu/4.2.4/
>  Found: $EPREFIX/usr/lib/gcc/x86_64-pc-linux-gnu/4.2.4/../../../../x86_64-pc-linux-gnu/lib/../lib64/
>  Found: $EPREFIX/usr/lib/gcc/x86_64-pc-linux-gnu/4.2.4/../../../x86_64-pc-linux-gnu/4.2.4/
>  Found: $EPREFIX/usr/lib/gcc/x86_64-pc-linux-gnu/4.2.4/../../../../lib64/
>  Found: /lib/x86_64-pc-linux-gnu/4.2.4/
>  Found: /lib/../lib64/
>  Found: /usr/lib/x86_64-pc-linux-gnu/4.2.4/
>  Found: /usr/lib/../lib64/
>  Found: $EPREFIX/usr/lib/gcc/x86_64-pc-linux-gnu/4.2.4/../../../../x86_64-pc-linux-gnu/lib/
>  Found: $EPREFIX/usr/lib/gcc/x86_64-pc-linux-gnu/4.2.4/../../../
>  Found: /lib/
>  Found: /usr/lib/
>  Existing: $EPREFIX/usr/lib/gcc/x86_64-pc-linux-gnu/4.2.4
> +Existing: $EPREFIX/usr/lib64
>  Existing: /lib64
>  Existing: /usr/lib64
>  Existing: $EPREFIX/usr/x86_64-pc-linux-gnu/lib
>  Existing: $EPREFIX/usr/lib
>  Existing: /lib
>  Existing: /usr/lib

2. Bootstrapping having gcc-4.3.2 unmasked fails when
sys-devel/gcc-4.3.2 is emerged for the first time. Although CPPFLAGS and
LDFLAGS are correctly set, the required and of course already emerged
libraries gmp and mpfr are not found.
binutils-config seems to be the root of this problem. Using
$EPREFIX/usr/x86_64-pc-linux-gnu/bin/ld (is this the binutils-config
wrapper?) the paths given by $LDFLAGS are not passed in the original
order to the "real"
$EPREFIX/usr/x86_64-pc-linux-gnu/binutils-bin/2.18.50.0.9/ld.
Eventually the gcc conftest.c for gmp/mpfr fails because the outdated
system libs /usr/lib64/lib{gmp,mpfr}.so are used for linking instead of
the ones from $EPREFIX/usr/lib. The following diff shows how the paths
are reordered when using the binutils-config wrapper instead of directly
calling the actual ld binary (output generated using some strace magic).
Is there a reason why the "-L$EPREFIX/..." parameters are moved to the
end of the list when using the ld wrapper?

> --- real-ld.log
> +++ wrapper-ld.log
> @@ -1,22 +1,16 @@
>  execve("$EPREFIX/usr/x86_64-pc-linux-gnu/binutils-bin/2.18.50.0.9/ld",
> -["$EPREFIX/usr/x86_64-pc-linux-"...,
> +["$EPREFIX/usr/bin/ld"...,
>  "-o"...,
>  "/tmp/gcc-4.3.2-conftest"...,
>  "/usr/lib/gcc/x86_64-redhat-linux"...,
>  "/usr/lib/gcc/x86_64-redhat-linux"...,
>  "/usr/lib/gcc/x86_64-redhat-linux"...,
> -"-L$EPREFIX/usr/lib"...,
> -"-L$EPREFIX/lib"...,
>  "-L/usr/lib/gcc/x86_64-redhat-lin"...,
>  "-L/usr/lib/gcc/x86_64-redhat-lin"...,
>  "-L/usr/lib/gcc/x86_64-redhat-lin"...,
>  "-L/usr/lib/gcc/x86_64-redhat-lin"...,
>  "-L/lib/../lib64"...,
>  "-L/usr/lib/../lib64"...,
> -"-rpath"...,
> -"$EPREFIX/usr/lib"...,
> -"-rpath"...,
> -"$EPREFIX/lib"...,
>  "/tmp/gcc-4.3.2-conftest.o"...,
>  "-lmpfr"...,
>  "-lgmp"...,
> @@ -30,4 +24,10 @@
>  "-lgcc_s"...,
>  "--no-as-needed"...,
>  "/usr/lib/gcc/x86_64-redhat-linux"...,
> -"/usr/lib/gcc/x86_64-redhat-linux"...]
> +"/usr/lib/gcc/x86_64-redhat-linux"...,
> +"-rpath"...,
> +"$EPREFIX/usr/x86_64-pc-linux-"...,
> +"-L$EPREFIX/usr/x86_64-pc-linu"...,
> +"-L$EPREFIX/usr/x86_64-pc-linu"...,
> +"-L$EPREFIX/usr/lib"...,
> +"-L$EPREFIX/lib"...]

Best regards,
	Stefan