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[SR-5457] Specific error message when user tries to compile Swift executable #48029

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swift-ci opened this issue Jul 14, 2017 · 2 comments
Open

[SR-5457] Specific error message when user tries to compile Swift executable #48029

swift-ci opened this issue Jul 14, 2017 · 2 comments
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compiler The Swift compiler in itself good first issue Good for newcomers improvement parser Area → compiler: The legacy C++ parser

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@swift-ci
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Previous ID SR-5457
Radar None
Original Reporter carlb (JIRA User)
Type Improvement
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Improvement, Parser, StarterBug
Assignee None
Priority Medium

md5: 111feeb80ab569e4bee27d9d511be231

Issue Description:

I was talking to a new Swift programmer who came from the ruby/python world. He had this output:

$ swift .build/debug/helloWorld
.build/debug/helloWorld:1:1: error: invalid UTF-8 found in source file
�����x� H__PAGEZERO8__TEXT@@__text__TEXT Ͷ �__stubs__TEXT��
.build/debug/helloWorld:1:2: error: invalid UTF-8 found in source file
�����x� H__PAGEZERO8__TEXT@@__text__TEXT Ͷ �__stubs__TEXT��
.build/debug/helloWorld:1:3: error: invalid UTF-8 found in source file
�����x� H__PAGEZERO8__TEXT@@__text__TEXT Ͷ �__stubs__TEXT��
.build/debug/helloWorld:1:4: error: input files must be encoded as UTF-8 instead of UTF-16
�����x� H__PAGEZERO8__TEXT@@__text__TEXT Ͷ �__stubs__TEXT��

Because he had started with Swift scripts, where you put swift in front of the file.swift name.

The error message above is perfectly valid, but unhelpful in this case. I would guess enough new programmers would make this mistake that it's worth discussing a special-case error message if the file to be run is already a Swift executable.
@belkadan
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Interesting! I think the best way to do this would be to check for various executable formats' "magic numbers" at the start of a source buffer. "\xCA\xFE\xBA\xBE" and "\x7fELF" would handle both Mach-O and ELF executables (Darwin and Linux/BSD).

@belkadan
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Resetting assignee on all Starter Bugs not modified since 2018.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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compiler The Swift compiler in itself good first issue Good for newcomers improvement parser Area → compiler: The legacy C++ parser
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@belkadan @swift-ci