[CMake] determining which system headerfile provides a given function

[Stephen Kelly]

René J.V. Bertin wrote:

> Hello,
> 
> I need to determine the availability of a certain function (reallocf) and
> which headerfile provides its prototype. If there is a function that
> handles this case I must have overlooked it (including on google), so I
> tried repeating a check_symbol_exist() call repeatedly with the various
> known header file paths. But that also doesn't work, either because of
> caching or because I'm doing something else wrong.
> 
> So, how does one handle this kind of situation?


 http://www.macieira.org/blog/2012/05/doesnt-work-doesnt-work/

 http://sscce.org/