mesonbuild/meson

Compiler detection is incorrect for native LLVM/Clang install on Windows

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#2,560 opened on Oct 30, 2017

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 (9 comments) (2 reactions) (0 assignees)Python (1,465 forks)batch import
OS:windowscompilershelp wanted

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Description

ClangCompiler.get_soname_args assumes that Clang on Windows is running under MINGW. It then tries to generate -Wl,-soname options, which are incompatible with Clang 5.0.0.0 running natively on Windows.

CompilerArgs.to_native adds groups via -Wl,--start-group and -Wl,--end-group (as get_compiler_uses_gnuld returns true for Clang on Windows).

CCompiler.gen_import_library_args adds the -Wl,--out-implib option.

CCompiler.build_rpath_args adds the -Wl,-rpath option.

Related options -Wl,--as-needed and -Wl,--no-undefined aren't supported either, but they can be disabled via the b_asneeded and b_lundef flags, respectively.

Contributor guide

Research direction
Inspect the compiler detection logic for Clang on Windows. Trace the functions mentioned in the issue and identify where MINGW assumptions are made. Implement detection to differentiate native Clang from MINGW Clang and adjust the compiler arguments accordingly.
Tech stack
pythonccpp
Domain
build systemdeveloper experience
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GitPythonC++
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50