libllvm does not create a native llvm-config · termux/termux-packages#879

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描述

Cross compiling llvm builds a native (host=build) version of llvm-config as a make step. But in termux, this is not the case. The native llvm-config is built for target host. The native build takes place in $TERMUX_PKG_BUILDDIR/NATIVE. I was unable to find the root cause, but, the native build also uses $TERMUX_STANDALONE_TOOLCHAIN/bin/clang++. I suspect that this may be a bug in the cross compilation mechanism of cmake itself.

This is required to build rustc and other packages dependent on llvm-config.

贡献者指南

技术栈: cppshell
领域: build systemdevops
议题类型: bug
难度: 5
预计时间: over 1 week
活动状态: stale
清晰度: needs investigation
前置要求: Understanding of Termux package build systemKnowledge of CMake cross compilationFamiliarity with LLVM build scriptsExperience with native vs cross builds
新手友好度: 15
研究方向: Investigate why the native build of llvm config uses the cross toolchain instead of host. Check CMake variables like CMAKE CROSSCOMPILING and how the native build is invoked in the LLVM CMakeLists.txt. Look at termux packages/packages/libllvm/build.sh for cmake arguments. Search for comments or recent changes in the issue thread.