[cfe-commits] tgmath.h

Douglas Gregor dgregor at apple.com
Tue Feb 17 23:10:22 PST 2009

On Feb 17, 2009, at 3:30 PM, Howard Hinnant wrote:
> Oh, and:
> -------------
> none of the above:
> -------------
> 81 lines of output starting with:
> test.c:7:8: error: no matching function for call to '__tg_promote'
>    x = acos(x);
>        ^~~~~~~
> ./tgmath.h:88:29: note: instantiated from:
> #define acos(__x) __tg_acos(__tg_promote1((__x))(__x))
> :-)

I just added some more toys that should help improve this. First of  
all, I wired up the Objective-C "unavailable" attribute so that it  
works like a C++0x deleted function, e.g.,

	void f(int) __attribute__((__unavailable__));

	f(5); // error: called an unavailable function

Second, we now allow "overloadable" functions in C to be variadic  
without any named parameters, e.g., this is well-formed

	void f(...) __attribute__((__overloaded__));

I'm sure that'll help improve the diagnostics in tgmath.h :)

	- Doug

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