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Date: Tue, 14 Feb 2017 13:19:44 +0100
From: "Romain" <romain@...bones.com>
To: <musl@...ts.openwall.com>
Subject: RE: ld-musl-i386.so.1 disappear after gcc install
Hello Rich and All,
Thanks for reply
> Where did ldconfig.real come from? If it's part of the Ubuntu system
you're compiling from
Yes this is part of the Ubuntu system .
> it shouldn't be getting run on the cross-target at all;
I probably did not understand well, but in my head the second pass of GCC is
done by the host compiler (--host and --build are x86_64-linux-gnu-gcc in my
case) so the libc of host compiler "is running"
> my guess would be that something in your build process is unaware that
you're cross-compiling.
Yes I think I miss something in the cross compiler builing concept
> If it's part of the target musl system then it should not even exist;
ldconfig is a glibc thing.
I put here the simple step of my toolchain building, if you see an obvious
mistake, let me know
1 - PACKAGES
host : x86_64-linux-gnu
target : i486-zydux-linux-musl
arch : x86
kernel : 4.9.7
binutils : 2.27
gcc : 6.3.0
musl : 1.1.16
2 - PREPARE
$ export PATH=/home/romain/toolchain/bin:$PATH
3- KERNEL HEADER
$ make ARCH=x86
INSTALL_HDR_PATH=/home/romain/toolchain/i486-zydux-linux-musl/usr
headers_install
2 - BINUTILS
$ cd /home/romain/builds/build-binutils
$ /home/romain/sources/binutils-2.27/configure
--target=i486-zydux-linux-musl
--prefix=/home/romain/toolchain
--with-sysroot=/home/romain/toolchain/i486-zydux-linux-musl
--disable-nls
--disable-multilib
$ make configure-host
$ make -j6
$ make install
2 - GCC (1)
$ cd /home/romain/builds/build-gcc1
$ /home/romain/sources/gcc-6.3.0/configure
--build=x86_64-linux-gnu
--host=x86_64-linux-gnu
--target=i486-zydux-linux-musl
--prefix=/home/romain/toolchain
--with-sysroot=/home/romain/toolchain/i486-zydux-linux-musl
--disable-nls
--disable-shared
--without-headers
--with-newlib
--disable-decimal-float
--disable-libgomp
--disable-libmudflap
--disable-libssp
--disable-libatomic
--disable-libquadmath
--disable-threads
--disable-multilib
--enable-languages=c
--disable-bootstrap
$ make -j6 all-gcc
$ make -j6 all-target-libgcc
$ make -j6 install-gcc
$ make -j6 install-target-libgcc
3 - MUSL
$ export CC=i486-zydux-linux-musl-gcc
$ cd /home/romain/sources/musl-1.1.16
$ ./configure
--target=i486-zydux-linux-musl
--prefix=/
$ make -j6
$ export DESTDIR=/home/romain/toolchain/i486-zydux-linux-musl
$ make install
4 - GCC (2)
$ cd /home/romain/builds/build-gcc2
$ /home/romain/sources/gcc-6.3.0/configure
--build=x86_64-linux-gnu
--host=x86_64-linux-gnu
--target=i486-zydux-linux-musl
--prefix=/home/romain/toolchain
--with-sysroot=/home/romain/toolchain/i486-zydux-linux-musl
--disable-nls
--enable-c99
--enable-long-long
--disable-multilib
--disable-libmudflap
--disable-libmpx
--enable-languages=c
--disable-bootstrap
$ make -j6
$ make -j6 install
5 - QUICK CHECK
$ i486-zydux-linux-musl-gcc -v
gcc version 6.3.0
$ i486-zydux-linux-musl-gcc dummy.c -o dummy
$ export LD_LIBRARY_PATH=/home/romain/toolchain/i486-zydux-linux-musl/lib:
$ ldd dummy
linux-gate.so.1 => (0xf775c000)
libc.so => /home/romain/toolchain/i486-zydux-linux-musl/lib/libc.so
(0xf76d0000)
Thanks in advance
(I hope I don't pollute this list with my newbie problem, let me know)
Romain
On Mon, Feb 13, 2017 at 03:26:07AM +0100, Romain wrote:
>> Hello,
>>
>> I try to create a script to cross-build a small linux based on musl.
>> (https://github.com/rom1nux/zydux-forge)
>>
>> Basically I first create my cross toolchain in 3 steps
>>
>> 1 - Build static gcc (first pass)
>> 2 - Build musl
>> 3 - Build dynamic gcc (second pass)
>>
>> When I build musl, I can find the loader ld-musl-i386.so.1 this is a
>> link to /lib/libc.so But when I do the second pass of gcc the
>> ld-musl-i386.so.1 is removed at the gcc "make install"
>>
>> I create a watch with "audit" to see what process remove the file, and
>> it seem that /sbin/ldconfig.real remove the loader, I don't understand
why.
>> (I fix this by creating my own link, and I can start my target, but I
>> don't understand what append)
>>
>> My host :
>> Ubuntu 16.04
>> Arch : x86_64
>> Kernel : 4.4.0
>> Gcc : 5.4 (x86_64-linux-gnu-gcc)
>>
>> My Cross/Target :
>> Arch : x86
>> Kernel : 4.9.7
>> Gcc : 6.3.0 (i486-linux-musl-gcc)
>> Musl : 1.1.16
>>
>> Can you help me to understand why the linker ld-musl-i386.so.1 is
>> removed by /sbin/ldconfig.real, and how to avoid this ?
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