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Date: Wed, 24 Jan 2018 17:37:53 -0800 (PST)
From: Po-yi Wang <player@....bc.ca>
To: musl@...ts.openwall.com
Subject: Re: any one managed to compile and run xz-5.0.8 or xz-5.2.3
 ?



On Wed, 24 Jan 2018, Rich Felker wrote:

> On Wed, Jan 24, 2018 at 04:18:59PM -0800, Po-yi Wang wrote:
>> hi
>>
>> any one managed to compile and run xz with musl on ppc target ?
>> i've managed to compile and run "xz --version" on i486 and arm
>> targets, but not on ppc target. i've tried gcc-3.4.5 and gcc-4.1.2.
>> gcc-3.4.5 version simply hangs, while gcc-4.1.2 version seg faults --
>> with seg fault, i can at least use gdb to get some info out. i do
>> not know how to use gdb to trace a hanged program. anyway, this is
>> the output for gcc-4.1.2 compiled version. (xz-5.0.8):
>
> Where did you get gcc 3.4.5 or 4.1.2 toolchains for musl ppc? Is any
> other software working when compiled with them? If you're not using a
> real cross or native musl toolchain but the musl-gcc wrapper, it
> probably lacks a lot of stuff it needs to work on ppc. In particular a
> ppc toolchain that will be used for dynamic-linking needs to be
> configured to always use "secure-plt", and whether static or dynamic,
> it needs to be using 64-bit long double. You should have hit an error
> configuring musl here if the compiler doesn't match:
>
>    checking whether compiler's long double definition matches float.h...
>
> Please provide more details.
>
>> gdb src/xz/xz
>>
>> GNU gdb (GDB) 7.12.1
>> Copyright (C) 2017 Free Software Foundation, Inc.
>> License GPLv3+: GNU GPL version 3 or later
>> <http://gnu.org/licenses/gpl.html>
>> This is free software: you are free to change and redistribute it.
>> There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
>> and "show warranty" for details.
>> This GDB was configured as "powerpc-unknown-linux-gnu".
>> Type "show configuration" for configuration details.
>> For bug reporting instructions, please see:
>> <http://www.gnu.org/software/gdb/bugs/>.
>> Find the GDB manual and other documentation resources online at:
>> <http://www.gnu.org/software/gdb/documentation/>.
>> For help, type "help".
>> Type "apropos word" to search for commands related to "word"...
>> Reading symbols from src/xz/xz...done.
>> (gdb) run --version
>> Starting program: /tmp/build/xz-5.0.8/src/xz/xz --version
>>
>> Program received signal SIGSEGV, Segmentation fault.
>> 0x4806fab8 in _dlstart_c (sp=0xbffff4a0, dynv=0x480b2ae4) at
>> ldso/dlstart.c:146
>> 146             GETFUNCSYM(&dls2, __dls2, base+dyn[DT_PLTGOT]);
>> (gdb) bt
>> #0  0x4806fab8 in _dlstart_c (sp=0xbffff4a0, dynv=0x480b2ae4)
>>     at ldso/dlstart.c:146
>> #1  0x480778ec in _dlstart () from /lib/ld-musl-powerpc-sf.so.1
>> (gdb) quit
>> A debugging session is active.
>>
>>         Inferior 1 [process 22188] will be killed.
>>
>> Quit anyway? (y or n) y
>
> This is an odd place to crash, and if it's crashing here it's almost
> surely crashing for all programs, not just xz, since it hasn't gotten
> to the point of looking at the program being run. It could be an issue
> with very-outdated binutils doing something funny at link time linking
> libc.so.
actually other program compiled so far all works: (at least --version 
works)
res/ppc/bash-4.4:         ELF 32-bit MSB executable, PowerPC or cisco 
4500, version 1 (SYSV), statically linked, stripped
res/ppc/dbclient:         ELF 32-bit MSB executable, PowerPC or cisco 
4500, version 1 (SYSV), statically linked, stripped
res/ppc/dropbear:         ELF 32-bit MSB executable, PowerPC or cisco 
4500, version 1 (SYSV), statically linked, stripped
res/ppc/dropbearconvert:  ELF 32-bit MSB executable, PowerPC or cisco 
4500, version 1 (SYSV), statically linked, stripped
res/ppc/dropbearkey:      ELF 32-bit MSB executable, PowerPC or cisco 
4500, version 1 (SYSV), statically linked, stripped
res/ppc/ftp-0.17:         ELF 32-bit MSB executable, PowerPC or cisco 
4500, version 1 (SYSV), statically linked, stripped
res/ppc/make-3.80:        ELF 32-bit MSB executable, PowerPC or cisco 
4500, version 1 (SYSV), statically linked, stripped
res/ppc/make-4.1:         ELF 32-bit MSB executable, PowerPC or cisco 
4500, version 1 (SYSV), statically linked, stripped
res/ppc/msgfmt:           ELF 32-bit MSB executable, PowerPC or cisco 
4500, version 1 (SYSV), statically linked, stripped
res/ppc/msgmerge:         ELF 32-bit MSB executable, PowerPC or cisco 
4500, version 1 (SYSV), statically linked, stripped
res/ppc/ntpserver:        ELF 32-bit MSB executable, PowerPC or cisco 
4500, version 1 (SYSV), statically linked, stripped
res/ppc/patch-2.7.5:      ELF 32-bit MSB executable, PowerPC or cisco 
4500, version 1 (SYSV), statically linked, stripped
res/ppc/scp:              ELF 32-bit MSB executable, PowerPC or cisco 
4500, version 1 (SYSV), statically linked, stripped
res/ppc/tar-1.22:         ELF 32-bit MSB executable, PowerPC or cisco 
4500, version 1 (SYSV), statically linked, stripped
res/ppc/xxd-5.7:          ELF 32-bit MSB executable, PowerPC or cisco 
4500, version 1 (SYSV), statically linked, stripped
res/ppc/xxxd:             ELF 32-bit MSB executable, PowerPC or cisco 
4500, version 1 (SYSV), statically linked, stripped


>
> Rich
>

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