swiftlang/swift-package-manager

dsymutil emits warnings with experimental lto mode

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#6,890 创建于 2023年9月12日

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 (5 评论) (0 反应) (0 负责人)Swift (10,145 star) (1,462 fork)batch import
bughelp wanted

描述

When using --experimental-lto-mode=full dsymutil complains about not being able to find (intermediate?) object files created during the LTO process. Example:

$ git clone git@github.com:apple/swift-nio.git
$ cd swift-nio
$ swift build --configuration release --experimental-lto-mode=full --verbose
warning: (arm64) /tmp/lto.o unable to open object file: No such file or directory
warning: (arm64)  could not find object file symbol for symbol _$sSo14_sa_DoubleWordaMa
warning: (arm64)  could not find object file symbol for symbol _$sSo14_sa_DoubleWordaMaTm
...

贡献者指南

技术栈
swift
领域
build systemcli
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。
1-2 days
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。
stale
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
Swift programmingSwift package manager usageBasic understanding of LTO
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。
45
研究方向
Investigate how the swift build command handles LTO mode and passes object files to dsymutil. Check the CI logs for similar warnings. Look at the BuildOptions handling in the Swift Package Manager source code to see if there is a missing step to preserve LTO object files.