musllinux_1_1: C++ toolchain broken?

[ax3l]

Hi,

I am trying out the new quay.io/pypa/musllinux_1_1_x86_64 image from #1135 but the C++ compiler does not yet seem to work: #1135 (comment)

I tried compiling a simple c++/g++ hello world with this image.

It looks like g++ is not fully set up yet:

$ c++ main.cpp
ld: cannot find -lm
collect2: error: ld returned 1 exit status

I searched for a libm in the / dir and cannot find one. Adding -static also does not solve the problem.

Is something still missing for C++ builds in this base image? :)
cc @lkollar

[mayeut]

not sure what's going on with your build...
libm.a is provided as an empty archive file on musl systems (everything is in the libc shared library).

bash-5.0# file /usr/lib/libm.a
/usr/lib/libm.a: current ar archive

bash-5.0# cat main.cpp 
#include <math.h>

int main(int argc, char* argv[])
{
   return (int)log(atof(argv[1]));
}
bash-5.0# c++ main.cpp -lm
bash-5.0# ./a.out 1.0
bash-5.0# echo $?
0
bash-5.0# ./a.out 2.72
bash-5.0# echo $?
1
bash-5.0# c++ main.cpp
bash-5.0# ./a.out 1.0
bash-5.0# echo $?
0
bash-5.0# ./a.out 2.72
bash-5.0# echo $?
1

[ax3l]

Everything works now! Thanks! :)

I realized I removed some static libs (pthreads, which lacks fPIC) from my manylinux logic in the musllinux image, which broke the build.