swiftlang/swift

[SR-6082] Produce a better error message if Swift is run on a system without clang++

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#48,637 opened on 2017年10月6日

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Linuxcompilergood first issueimprovementlegacy driver

説明
Previous ID SR-6082
Radar rdar://problem/23197056
Original Reporter @belkadan
Type Improvement
Votes 0
Component/s Compiler
Labels Improvement, Driver, Linux, StarterBug
Assignee None
Priority Medium

md5: 0ed0a272c70aa068a13e89f859372a45

relates to:

  • SR-834 Very unhelpful error message when clang++ cannot be invoked

Issue Description:

Swift on Linux (and other non-Apple platforms) calls clang++ to perform linking; if it's not found, we used to get this lousy error message:

<unknown>:0: error: link command failed with exit code 127 (use -v to see invocation)

We should do better. (It's possible we already do do better; I just don't have access to a Linux system without clang++ installed at the moment. If you have such a system, you can help out with this bug by downloading Swift from https://swift.org/download/ and seeing what echo 'print("hello")' | swiftc - produces.)

コントリビューターガイド

技術スタック
swift
領域
developer experiencetooling
Issue 種別
feature
難度新しい貢献者にとっての実装難度です。1 は非常に小さな変更、5 は専門的な作業です。
3
推定時間経験ある貢献者が調査、実装、テスト、pull request 準備にかけるおおよその時間範囲です。
under 1 hour
活動状況Issue が今どれだけ取り組みやすいかを示します。新しい、活発、古い、ブロック中、またはメンテナー入力待ちなどです。
stale
明確さ期待される変更、受け入れ条件、次の手順がどれだけ明確かを示します。
mostly clear
前提条件
Swift compiler basicsLinux system without clang++
初心者向け度初回貢献者にどれだけ取り組みやすいかを 1-100 で推定したスコアです。
60
調査方針
First, verify the current error message on a Linux system without clang++ by running `echo 'print("hello")' | swiftc `. Then, locate the Swift driver code that invokes clang++ for linking (likely in the driver or BuildExecution module). Improve the error message to clearly indicate that clang++ is missing and suggest installation. Refer to the linked issue SR 834 for previous context.