http://llvm.org/bugs/show_bug.cgi?id=12767
Bug #: 12767
Summary: The preprocessor doesn't inhibit expansion when
concatenating with an empty token
Product: clang
Version: 3.0
Platform: All
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
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
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