libnghttp2.la referenced in libcurl.la but missing (LibCURL_jll v7.73.0+6)

[Alexander-Barth]

While trying to compile NetCDF 4.9.0 with LibCURL_jll v7.73.0+6, I see this error:

[11:40:07] /bin/sh ../libtool  --tag=CXX   --mode=link c++  -g -O2  -L/workspace/destdir/lib -o libncxml.la  ncxml_xml2.lo  -lhdf5_hl -lhdf5 -lm -lz -ldl -lxml2 -lcurl 
[11:40:07] grep: /workspace/destdir/lib/libnghttp2.la: No such file or directory
[11:40:07] sed: /workspace/destdir/lib/libnghttp2.la: No such file or directory
[11:40:07] libtool:   error: '/workspace/destdir/lib/libnghttp2.la' is not a valid libtool archive
[11:40:07] make[2]: *** [Makefile:530: libncxml.la] Error 1

In fact the file libnghttp2.la is referenced in libcurl.la

sandbox:${WORKSPACE}/destdir/lib # grep libnghttp2.la /workspace/destdir/lib/libcurl.la
dependency_libs=' -L/workspace/destdir/lib /workspace/destdir/lib/libnghttp2.la -lssh2 -lmbedtls -lmbedx509 -lmbedcrypto -lz -lrt'

Only binaries of libnghttp2 are currently distributed:

sandbox:${WORKSPACE}/destdir/lib # ls /workspace/destdir/lib/libnghttp2*
/workspace/destdir/lib/libnghttp2.a           /workspace/destdir/lib/libnghttp2.so          /workspace/destdir/lib/libnghttp2.so.14       /workspace/destdir/lib/libnghttp2.so.14.21.2

If I use LibCURL_jll v7.81.0+0, I don't get this error during build-time but at runtime Mac OS complains with on julia 1.8:

dlopen(/Users/runner/.julia/artifacts/2906ec26bc4c6a3f0b45255d1d933904f49abf30/lib/libnetcdf.19.dylib, 1): Library not loaded: @rpath/libcurl.4.dylib
  Referenced from: /Users/runner/.julia/artifacts/[29](https://github.com/Alexander-Barth/NCDatasets.jl/runs/6876791696?check_suite_focus=true#step:8:30)06ec26bc4c6a3f0b45255d1d933904f49abf[30](https://github.com/Alexander-Barth/NCDatasets.jl/runs/6876791696?check_suite_focus=true#step:8:31)/lib/libnetcdf.19.dylib
  Reason: Incompatible library version: libnetcdf.19.dylib requires version 13.0.0 or later, but libcurl.4.dylib provides version 12.0.0

I guess this means that libcurl is too new.

[giordano]

Delete all *.la files. For context: we now do this automatically during audit thanks to JuliaPackaging/BinaryBuilder.jl#1105, but can't do much for old builds (apart from automatically deleting them before entering the build environment, but I'm a bit wary of doing that blindly)

[Alexander-Barth]

OK, this is good to know! I am a bit confused which version of libcurl we would use for julia 1.8. Is is correct to compile and link against 7.73.0+6 ?

[giordano]

If you're requiring Julia v1.8 anyway in the JLL package, then you can use 7.81.0: https://github.com/JuliaLang/julia/blob/6368fdc6565857b2f2332f8ce74259009184eb62/stdlib/LibCURL_jll/Project.toml#L3

[Alexander-Barth]

Do you maybe have any idea why I get this error on Mac?

dlopen(/Users/runner/.julia/artifacts/2906ec26bc4c6a3f0b45255d1d933904f49abf30/lib/libnetcdf.19.dylib, 1): Library not loaded: @rpath/libcurl.4.dylib
  Referenced from: /Users/runner/.julia/artifacts/[29](https://github.com/Alexander-Barth/NCDatasets.jl/runs/6876791696?check_suite_focus=true#step:8:30)06ec26bc4c6a3f0b45255d1d933904f49abf[30](https://github.com/Alexander-Barth/NCDatasets.jl/runs/6876791696?check_suite_focus=true#step:8:31)/lib/libnetcdf.19.dylib
  Reason: Incompatible library version: libnetcdf.19.dylib requires version 13.0.0 or later, but libcurl.4.dylib provides version 12.0.0

Link to CI: https://github.com/Alexander-Barth/NCDatasets.jl/runs/6876791696?check_suite_focus=true

(I have this error actually with libcurl 7.81.0 and 7.73.0, NetCDF_jll is generated by this script)

[Alexander-Barth]

Removing the *.la files solved indeed my original problem (and it is not necessary anyways when using LibCURL 7.81.0). I have opened a separate issue concerning curl version mismatch (JuliaPackaging/BinaryBuilder.jl#1210) as you know :-)

Thanks a lot!