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Message-ID: <20160805230816.GQ15995@brightrain.aerifal.cx>
Date: Fri, 5 Aug 2016 19:08:16 -0400
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: ./configure errors witn musl-gcc (zlib library conflict
when building openssh)
On Fri, Aug 05, 2016 at 06:32:14PM -0400, Assaf Gordon wrote:
> Hello,
>
> I'm trying to build openssh on Ubuntu with musl-gcc, and encountered a problem during "./configure" due to required library (zlib) which causes conflicts between the system's glibc and musl-libc.
>
> There is probably a simple solution, but I couldn't find one.
>
> The system is Ubuntu 14.04 LTS, gcc 4.8.4.
> musl is 1.1.15 built from source, installed to /usr/local/musl .
>
> First, I build zlib using musl-gcc:
>
> wget http://zlib.net/zlib-1.2.8.tar.gz
> tar -xf zlib-1.2.8.tar.gz
> cd zlib-1.2.8
> CC=musl-gcc ./configure
> make
>
> This works well (note I did not install it with 'sudo make install').
>
> Second, I try to build openssh:
>
> git clone https://github.com/openssh/openssh-portable
> cd openssh-portable
> autoreconf -if
> CC=musl-gcc ./configure --without-stackprotect --with-zlib=/home/ubuntu/sources/zlib-1.2.8
> But this fails with:
>
> checking zlib.h usability... yes
> checking zlib.h presence... yes
> checking for zlib.h... yes
> checking for deflate in -lz... yes
> checking for possibly buggy zlib... yes
> configure: error: *** zlib too old - check config.log ***
> Your reported zlib version has known security problems. It's possible your
> vendor has fixed these problems without changing the version number. If you
> are sure this is the case, you can disable the check by running
> "./configure --without-zlib-version-check".
> If you are in doubt, upgrade zlib to version 1.2.3 or greater.
> See http://www.gzip.org/zlib/ for details.
>
> The problem is not that zlib is "too old", but that the wrong shard-object is used (it uses the system's one).
> From config.log:
>
> configure:9002: checking for possibly buggy zlib
> configure:9041: musl-gcc -o conftest -g -O2 -Wall -Wpointer-arith -Wuninitialized -Wsign-compare -Wformat-security -Wsizeof-pointer-memaccess -Wno-pointer-sign -Wno-unused-result -fno-strict-aliasing -D_FORTIFY_SOURCE=2 -ftrapv -fno-builtin-memset -I/home/ubuntu/sources/zlib-1.2.8 -L/home/ubuntu/sources/zlib-1.2.8 -Wl,-z,relro -Wl,-z,now -Wl,-z,noexecstack conftest.c -lz >&5
> configure:9041: $? = 0
> configure:9041: ./conftest
> Error relocating /lib/x86_64-linux-gnu/libz.so.1: __snprintf_chk: symbol not found
> Error relocating /lib/x86_64-linux-gnu/libz.so.1: __vsnprintf_chk: symbol not found
> configure:9041: $? = 127
> configure: program exited with status 127
Somehow musl-gcc is not correctly replacing the compiler's builtin
library path. It's likely something weird Ubuntu's gcc build is doing
for their multilib/multiarch support, but hard to say specifically
what. Can you build a hello world program succesfully? What does
musl-gcc -v hello.c say, given a hello world program hello.c?
Rich
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