Re: [gentoo-alt] rap experiments

[Francois Bissey]

> On 20/01/2017, at 18:52, Benda Xu <heroxbd@g.o> wrote:
>
> The hack are in
>
>  https://gitweb.gentoo.org/repo/gentoo.git/tree/profiles/prefix/linux-standalone/profile.bashrc
>
> esp. line 14.


Very much like the bootstrapping described in LFS and in line with 

the way IBM does things for its “advanced toolchain” for power7/8.

I actually have an alternate toolchain provided by IBM the last one

for SLES11 provides glibc-2.17+gcc-4.8.5+. gcc is patched to find ld64.so.1

in the right place _and_ a rpath is added at the spec level also.

Anyway gcc/config/rs6000 is a bit more complicated than the i386 one

and for some reasons bits are missed by the sed line:

grep "_DYNAMIC_LINKER." gcc/config/rs6000/linux64.h

#define GLIBC_DYNAMIC_LINKER32 "/shared/work_no_backup/ppc64-prefix/lib/ld.so.1"

#define GLIBC_DYNAMIC_LINKER64 "%{mabi=elfv1:/lib64/ld64.so.1;:/lib64/ld64.so.2}”   <==

#define GLIBC_DYNAMIC_LINKER64 "%{mabi=elfv2:/lib64/ld64.so.2;:/lib64/ld64.so.1}”   <==

#define UCLIBC_DYNAMIC_LINKER32 "/shared/work_no_backup/ppc64-prefix/lib/ld-uClibc.so.0"

#define UCLIBC_DYNAMIC_LINKER64 "/shared/work_no_backup/ppc64-prefix/lib/ld64-uClibc.so.0"

#define CHOOSE_DYNAMIC_LINKER(G, U) "%{mglibc:" G ";:" U "}"

#define CHOOSE_DYNAMIC_LINKER(G, U) "%{muclibc:" U ";:" G "}"

#define GNU_USER_DYNAMIC_LINKER32 \

  CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32)

#define GNU_USER_DYNAMIC_LINKER64 \

  CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64)

  -dynamic-linker " GNU_USER_DYNAMIC_LINKER32 "}}"

  -dynamic-linker " GNU_USER_DYNAMIC_LINKER64 "}}”



That explains a lot.

My -dumpspecs from the advanced toolchain has 

/opt/at7.0%{mabi=elfv2:/lib64/ld64.so.2;:/lib64/ld64.so.1}

I will try to fix this, thanks for pointer, I was wondering where the gcc hack was.



François