C++/C mangleof inconsistency for OS X

[Michel Fortin via Digitalmars-d]

On 2015-04-21 18:29:36 +0000, Jacob Carlborg <doob at me.com> said:

> On 2015-04-21 19:01, Dan Olson wrote:
> 
>> If I want to call a C function void debug(const char*) from a C library,
>> I would do this because of D "debug" keyword:
>> 
>>    pragma(mangle, "debug")
>>    extern (C) void debug_c(const(char*));
>> 
>> Now I would think debug_c.mangleof -> "debug"
>> (and that is indeed what dmd produces even on OS X).
> 
> Are there use cases where one would want to use some other mangling 
> than C? I mean, D is a system programing language.

Apple does this in many of its own C headers. Lookup the definition of 
pthread_join for instance, you'll see the __DARWIN_ALIAS macro which 
when expanded under certain circumstances adds a suffix to the symbol 
name in a similar way to pragma(mangle) in D. This allows some fixes to 
only apply to code compiled with newer SDKs. (Also note that the 
underscore is explicitly put there by the macro.)

-- 
Michel Fortin
michel.fortin at michelf.ca
http://michelf.ca