Failed link with boost using ldc2

[Rogni]

Describe the bug https://travis-ci.org/github/Rogni/MesonLinkWithBoostBug/builds/735436192#L307

error link boost using ldc2 in last versions meson (0.54, 0.55)

Error:

ldc2  -of=app app.p/main.d.o app.p/external.cpp.o -L=--allow-shlib-undefined -link-defaultlib-shared /usr/lib/x86_64-linux-gnu/libboost_thread.so.1.65.1 -L=-lstdc++ -L=-lstdc++
Error: unrecognized file extension 1

To Reproduce reproduced in versions 0.54 and 0.55 in version 0.53.2 boost linked as LINK_ARGS = -L=-L--allow-shlib-undefined -L=--start-group -L=-lboost_thread -L=-lstdc++ -L=--end-group

https://github.com/Rogni/MesonLinkWithBoostBug

meson.build

project('MesonLinkBoostBug', ['d', 'cpp'])
src = ['main.d', 'external.cpp']
boost_dep = dependency('boost', modules: 'thread')
executable('app', src, dependencies: boost_dep)

Expected behavior maybe need append prefix -L= to /usr/lib/x86_64-linux-gnu/libboost_thread.so.1.65.1

system parameters

• native build
• Linux Mint 20 Ulyana
• Python 3.8.5
• what meson --version reproduced in versions 0.54.3, 0.55.3
• what ninja --version: 1.10.0.git.kitware.jobserver-1

[dcbaker]

This is also broken with dmd, only gdc currently works.

[mensinda]

Is this a general bug when passing absolute paths to libraries, or is this boost specific?

[Rogni]

tried

zlib = dependency('zlib', method: 'cmake')

executable('app', src, dependencies: zlib)

in build.ninja:

LINK_ARGS = -L=--allow-shlib-undefined -link-defaultlib-shared /usr/lib/x86_64-linux-gnu/libz.so -L=-lstdc++

app linked

[dcbaker]

it has to do with getting version numbers, ldc and dmd expect the file to end in .so (or whatevert) not .so.X.Y.Z, but if you pass them as -L=mylib.so.1.2.3 that works. And it's really easy for the DMD and LDC to do that. so that's what I did my my PR.