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[SR-323] Using alloca function in Swift results in linker error #42945

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swift-ci opened this issue Dec 20, 2015 · 3 comments
Open

[SR-323] Using alloca function in Swift results in linker error #42945

swift-ci opened this issue Dec 20, 2015 · 3 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself

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@swift-ci
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Previous ID SR-323
Radar rdar://problem/42269493
Original Reporter loic (JIRA User)
Type Bug
Environment

Swift 2.2 (December 18)

Additional Detail from JIRA
Votes 1
Component/s Compiler
Labels Bug
Assignee None
Priority Medium

md5: 6e64deb605de903e90b3c21d02350b0a

Issue Description:

Xcode will autocomplete "all" to "alloca(Int)".
However, trying to compile this program:

import Darwin
let ptr = alloca(10)

will give a linker error:

Undefined symbols for architecture x86_64:
  "_alloca", referenced from:
      _main in main.swift.o
ld: symbol(s) not found for architecture x86_64

I think either "alloca" should be allowed, or Xcode shouldn't suggest it, and it should trigger a less cryptic error message (as it does for "fork").
@belkadan
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Yeah, we should probably blacklist alloca in Swift code. It won't do anything reasonable.

@Dante-Broggi
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`alloca` still fails in linking on Xcode 10 toolchain.

@belkadan
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@swift-ci create

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself
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3 participants
@belkadan @swift-ci @Dante-Broggi