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The preprocessor doesn't inhibit expansion when concatenating with an empty token #13139

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llvmbot opened this issue May 8, 2012 · 3 comments
Closed

The preprocessor doesn't inhibit expansion when concatenating with an empty token #13139

llvmbot opened this issue May 8, 2012 · 3 comments
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bugzilla Issues migrated from bugzilla c++11

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@llvmbot
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llvmbot commented May 8, 2012

Bugzilla Link 12767
Resolution FIXED
Resolved on May 24, 2013 20:36
Version trunk
OS All
Reporter LLVM Bugzilla Contributor
CC @akyrtzi,@lattner,@DougGregor,@hvdijk

Extended Description

The preprocessor doesn't inhibit expansion when concatenating with an empty token.
Here an example:

#define EMPTY()
#define DEFER(id) id EMPTY()

#define A(p, ...) p ## VA_ARGS // should inhibit expansion of ...

#define B(p, ...) p VA_ARGS

#define TEST() 123

A(, DEFER(TEST)()) // should be TEST (), but clang expands to 123
B(, DEFER(TEST)()) // should be 123
@hvdijk
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hvdijk commented Apr 3, 2013

*** Bug llvm/llvm-bugzilla-archive#15661 has been marked as a duplicate of this bug. ***

@akyrtzi
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akyrtzi commented May 25, 2013

Fixed in r182699.

@hvdijk
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hvdijk commented Nov 26, 2021

mentioned in issue llvm/llvm-bugzilla-archive#15661

@llvmbot llvmbot transferred this issue from llvm/llvm-bugzilla-archive Dec 3, 2021
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@akyrtzi @hvdijk @llvmbot