How to compile zmq-beta for php docker image: does the C compiler works?

I spent 2 hours of what it lasts of my life trying to understand what was the problem on installing php’s zmq extension in a docker running alpine as base image. I would like to share my experience here.

During morning I would like to write supporting class for integrating zmq into our system and use it from inside containers where services are  supposed to run.

First I just added to Dockerfile the pecl install command, and expected it works:

FROM php:7-cli-alpine
RUN apk add zeromq libzmq
RUN pecl install zmq-beta \
   && docker-php-ext-enable zmq

Image page on Docker Hub specify there should be no problem (rif. https://hub.docker.com/_/php/  # PECL extensions )

> docker build .

[blah blah check that worked]

checking whether the C compiler works… no configure: error: in `/tmp/pear/temp/pear-build-defaultuserEhCEfp/zmq-1.1.3′: configure: error: C compiler cannot create executables See `config.log’ for more details

and no way to find this config.log :

> docker run –rm xxxx ls /tmp/pear/

no such file. In fact pecl cleanup its building folder everytime, even if it fails. (why?? or bigger: WHY??)

I started with a reduced image, just 

FROM php:7-cli-alpine
RUN apk add zeromq libzmq

I ran:

inside_docker> pecl install zmq-beta
you do not have autoconf!
inside_docker> apk add autoconf
...
inside_docker> pecl install zmq-beta 

no way, no config.log.

I am a bit nervouse, I asked my collegue, a PHP expert … “Sorry, I’m not aware of this completely”. More nervouse. Some food.

Tried in my machine, a debian, and pecl install worked.

I got source from git (now I follow http://zeromq.org/bindings:php )

inside_docker> git clone git://github.com/mkoppanen/php-zmq.git
...no git command
inside_docker> apk add git
..[repeat again]
inside_docker> cd php-zmq
inside_docker> phpize
... no phpize
inside_docker> apk add phpize
inside_docker> phpize
inside_docker> ./configure
....[blah ...]

check config.log

And now it exists! but, what?!?

configure:2697: cc -V >&5
cc: error: unrecognized command line option '-V'
cc: fatal error: no input files
compilation terminated.
configure:2708: $? = 1
configure:2697: cc -qversion >&5
cc: error: unrecognized command line option '-qversion'; did you mean '--version'?
cc: fatal error: no input files
compilation terminated.
configure:2708: $? = 1
configure:2728: checking whether the C compiler works
configure:2750: cc    conftest.c  >&5
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../x86_64-alpine-linux-musl/bin/ld: cannot find Scrt1.o: No such file or directory
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../x86_64-alpine-linux-musl/bin/ld: cannot find crti.o: No such file or directory
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../x86_64-alpine-linux-musl/bin/ld: cannot find -lssp_nonshared
collect2: error: ld returned 1 exit status
configure:2754: $? = 1
configure:2792: result: no
configure: failed program was:
| /* confdefs.h */
| #define PACKAGE_NAME ""
...

what is -qversion ? it looks wrong … (I wasted some more time checking that)

some line above this:

Target: x86_64-alpine-linux-musl

Configured with: /home/buildozer/aports/main/gcc/src/gcc-6.4.0/configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --build=x86_64-alpine-linux-musl --host=x86_64-alpine-linux-musl --target=x86_64-alpine-linux-musl --with-pkgversion='Alpine 6.4.0' --enable-checking=release --disable-fixed-point --disable-libstdcxx-pch --disable-multilib --disable-nls --disable-werror --disable-symvers --enable-__cxa_atexit --enable-default-pie --enable-cloog-backend --enable-languages=c,c++,objc,java,fortran,ada --disable-libssp --disable-libmpx --disable-libmudflap --disable-libsanitizer --enable-shared --enable-threads --enable-tls --with-system-zlib --with-linker-hash-style=gnu
Thread model: posix
gcc version 6.4.0 (Alpine 6.4.0)

I decided to compare with the config.log created in my debian machine. I splitted the lines:

../src/configure -v
--with-pkgversion='Ubuntu 7.3.0-27ubuntu1~18.04'
--with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++
 --prefix=/usr
 --with-gcc-major-version-only
 --program-suffix=-7
 --program-prefix=x86_64-linux-gnu-
 --enable-shared
 --enable-linker-build-id
 --libexecdir=/usr/lib
 --without-included-gettext
 --enable-threads=posix
 --libdir=/usr/lib
 --enable-nls
 --with-sysroot=/
 --enable-clocale=gnu
 --enable-libstdcxx-debug
 --enable-libstdcxx-time=yes
 --with-default-libstdcxx-abi=new
 --enable-gnu-unique-object
 --disable-vtable-verify
 --enable-libmpx --enable-plugin
 --enable-default-pie
 --with-system-zlib
 --with-target-system-zlib
 --enable-objc-gc=auto
 --enable-multiarch
 --disable-werror
 --with-arch-32=i686
 --with-abi=m64
 --with-multilib-list=m32,m64,mx32
 --enable-multilib
 --with-tune=generic
 --enable-offload-targets=nvptx-none
 --without-cuda-driver
 --enable-checking=release
 --build=x86_64-linux-gnu
 --host=x86_64-linux-gnu
 --target=x86_64-linux-gnu


/home/buildozer/aports/main/gcc/src/gcc-6.4.0/configure --prefix=/usr
 --mandir=/usr/share/man
 --infodir=/usr/share/info
 --build=x86_64-alpine-linux-musl
 --host=x86_64-alpine-linux-musl
 --target=x86_64-alpine-linux-musl
 --with-pkgversion='Alpine 6.4.0'
 --enable-checking=release
 --disable-fixed-point
 --disable-libstdcxx-pch
 --disable-multilib
 --disable-nls
 --disable-werror
 --disable-symvers
 --enable-__cxa_atexit
 --enable-default-pie
 --enable-cloog-backend
 --enable-languages=c,c++,objc,java,fortran,ada
 --disable-libssp
 --disable-libmpx
 --disable-libmudflap
 --disable-libsanitizer
 --enable-shared
 --enable-threads
 --enable-tls
 --with-system-zlib
 --with-linker-hash-style=gnu

I asked the internet: what is multilib? is not possible to have m32 on alpine and blah … ( https://stackoverflow.com/questions/40539592/how-to-compile-a-32bit-hello-world-on-alpine ). Fuck. I just want something like:

inside_docker> apk add build-base

and then … pecl:

inside_docker> pecl install zmq-beta

It run! It works. So my Dockerfile:

FROM php:7-cli-alpine
RUN apk add autoconf gcc libzmq zeromq-dev zeromq coreutils build-base
RUN pecl install zmq-beta \
   && docker-php-ext-enable zmq

That’s all. Now I can start the real work.

Docker Image

The Dockerfile for it is on https://github.com/starsellersworld/reactphpzeromq

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