[CMake] CheckTypeSize and non-standard headers

[Aaron Turner]

More testing seems to indicate that check_symbol_exists won't find any
typedef defined in headers.

Looking a the CheckSymbolExists.cmake file, the following .c is
generated as a test:

#include <runetype.h>
void cmakeRequireSymbol(int dummy,...) {
    (void)dummy;
}

int main() {
#ifndef wint_t
    cmakeRequireSymbol(0, &wint_t);
#endif
    return 0;
}

Unfortunately, you can't use #ifndef to test for the existence of a
typedef, hence you get a compile failure and the result of the test is
false.

Is there another check which is typedef/define agnostic?  I'm sure I
could write my own, but this seems like it should be included in the
standard cmake library.


-- 
Aaron Turner
http://synfin.net/
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