http://llvm.org/bugs/show_bug.cgi?id=19141
Bug ID: 19141
Summary: ##__VA_ARGS__ does not expand inner macros, whereas
__VA_ARGS__ works as expected
Product: clang
Version: 3.4
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: Frontend
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
##__VA_ARGS__ does not expand inner macros, whereas __VA_ARGS__ works as
expected.
This input file (foo.m):
[--
#define F1(...) [NSString stringWithFormat:__VA_ARGS__]
#define F2(format, ...) [NSString stringWithFormat:(format), ##__VA_ARGS__]
NSLog(F1(@"%@", F1(@"%@", @"a")));
NSLog(F2(@"%@", F2(@"%@", @"a")));
--]
when processed with `clang -E -o foo.i foo.m`, produces the following output:
[--
# 1 "foo.m"
# 1 "<built-in>" 1
# 1 "<built-in>" 3
# 178 "<built-in>" 3
# 1 "<command line>" 1
# 1 "<built-in>" 2
# 1 "foo.m" 2
NSLog([NSString stringWithFormat:@"%@", [NSString stringWithFormat:@"%@",
@"a"]]);
NSLog([NSString stringWithFormat:(@"%@"), F2(@"%@", @"a")]);
--]
Version Details:
[--
$ clang --version
Apple LLVM version 5.1 (clang-503.0.38) (based on LLVM 3.4svn)
Target: x86_64-apple-darwin13.1.0
Thread model: posix
--]
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