termux/termux-packages

libllvm does not create a native llvm-config

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#879 建立於 2017年3月25日

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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.

貢獻者指南

技術棧
cppshell
領域
build systemdevops
議題類型
bug
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
5
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
over 1 week
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
stale
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
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
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
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.