Any plans to support musl libc?

[james-aurizn]

Version

6.5.5

Host machine and operating system

Alpine linux docker container.

Target machine and operating system (if different from host)

Compiler name and version (including patch level)

# g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-alpine-linux-musl/8.3.0/lto-wrapper
Target: x86_64-alpine-linux-musl
Configured with: /home/buildozer/aports/main/gcc/src/gcc-8.3.0/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 8.3.0' --enable-checking=release --disable-fixed-point --disable-libstdcxx-pch --disable-multilib --disable-nls --disable-werror --disable-symvers --enable-__cxa_atexit --enable-default-pie --enable-default-ssp --enable-cloog-backend --enable-languages=c,c++,objc,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 8.3.0 (Alpine 8.3.0)

The $ACE_ROOT/ace/config.h file

https://github.com/LASAGNE-Open-Systems/LASAGNE-Core/blob/release-1.5.1/bin/build/ace/config.h

The $ACE_ROOT/include/makeinclude/platform_macros.GNU file

https://github.com/LASAGNE-Open-Systems/LASAGNE-Core/blob/release-1.5.1/bin/build/ace/platform_macros.GNU

AREA/CLASS/EXAMPLE AFFECTED:

ACE.cpp fails to compile, and many if not all following units.

Synopsis

Looks like a bunch of types are defined differently, i.e. loff_t, ucontext_t, cpu_set_t.

Repeat by

Based on this https://github.com/LASAGNE-Open-Systems/docker-lasagne-core/blob/master/lasagne-core/Dockerfile except the top updated to read

FROM alpine:3.9
RUN apk update && apk add --virtual build-group build-base git figlet perl linux-headers
RUN git clone --depth 1 -b ACE+TAO-6_5_5 git://github.com/DOCGroup/MPC.git /opt/MPC \
 && git clone --depth 1 -b ACE+TAO-6_5_5 git://github.com/DOCGroup/ACE_TAO.git /opt/ACE_TAO \
 && git clone --depth 1 -b DDS-3.13.2 git://github.com/objectcomputing/OpenDDS.git /opt/OpenDDS \
 && git clone --depth 1 -b v1.5.1 git://github.com/LASAGNE-Open-Systems/LASAGNE-Core.git /opt/DAF

Sample fix/ workaround

Possibly too much effort, looks like musl has no backwards compatibility, and it may be too much effort to update ACE+TAO to be compliant with modern standards and also older libraries.

[jwillemsen]

Feel free to open a pull request to add support for musl libc or contact one of the commercial support provides to do a port for you, see http://www.dre.vanderbilt.edu/~schmidt/commercial-support.html

[drandreas]

I've fixed ACE compilation against musl libc. I'm aware that ACE is not ACE+TAO but the attached patch perhaps gives a good starting point for someone else who picks up the task.

ace-add-musl-support.txt

[jwillemsen]

Can you open a pull request with your changes @drandreas ? Most portability issues are in ACE so your changes would help anyone interested in musl libc

[drandreas]

Sorry, I do not yet consider the patch mature enough for production.
I report back when the code passed enough quality gates.

[mitza-oci]

I'm not sure why this was closed in 2019. Now reopened with PR #2275 linked.