mesonbuild/meson

Mingw64 cmake CMAKE_C_COMPILER illformatted string

Open

#14,636 创建于 2025年5月22日

在 GitHub 查看
 (1 评论) (1 反应) (0 负责人)Python (4,978 star) (1,465 fork)batch import
bughelp wantedmodule:cmakemsys

描述

Describe the bug An improper file path is provided to cmake subprojects when using mingw-w64-cmake.

To Reproduce Please include your meson.build files, preferably as a minimal toy example showing the issue. You may need to create simple source code files (don't include private/proprietary code).

  1. Install python,pip,meson &c through mingw when possible and pip when not.
  2. Install the mingw cmake package
  3. call meson configure with a cmake subproject in your root meson build: cmake = import('cmake') jansson_subproj = cmake.subproject('jansson-2.14.1') jansson_lib = jansson_subproj.dependency('jansson')

This should fail with the message: | The CMAKE_C_COMPILER: | C | is not a full path and was not found in the PATH. This is because meson generates a machine file for cmake (in my case it was at, \builddir\subprojects\jansson-2.14.1__CMake_build\CMakeMesonToolchainFile.cmake). The offending line was: set(CMAKE_C_COMPILER "C:/msys64/ucrt64/bin/cc.EXE") The mingw version of cmake uses the colon separator as a separator, as it is under unix. It looks like it catches the path separators to make them unix like, but does not escape the colon.

Expected behavior The colon to be escaped in the cmake var.

system parameters Native build. WIndows 10. Python 3.12.9 (from mingw) Meson 1.7.0 Ninja 1.12.1 cmake unknown because I have already uninstalled it. Possibly 3.31.5-1

贡献者指南

技术栈
python
领域
build system
议题类型
bug
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
1-3 hours
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
fresh
清晰度议题是否清楚说明期望改动、验收标准和下一步。
clear
前置要求
basic knowledge of meson build systemfamiliarity with cmake toolchain filesunderstanding of mingw path conventions
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
55
研究方向
The bug is in the CMake toolchain file generated by Meson, specifically the line `set(CMAKE C COMPILER "C:/msys64/ucrt64/bin/cc.EXE")` where the colon in the path is not escaped for CMake under MinGW. The file is located at `<builddir>/subprojects/<subproject>/ CMake build/CMakeMesonToolchainFile.cmake`. To fix, ensure that the path string is properly escaped when setting CMAKE C COMPILER, likely by replacing the colon with a backslash colon or using a CMake compatible path format. Refer to Meson's source code for toolchain generation, possibly in `mesonbuild/backend/cmake.py` or similar.