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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