[CMake] howto retrigger check_function_exists

[J Decker]

I don't understand how this works....

info_size[1] will return 'N'
how will it know it has to pass like 14 arguments to get the right
character?  And even then the character '4' is not the value 4.



- this is the code generated for check_type_size

#include <sys/types.h>
#include <stdint.h>
#include <stddef.h>
#include "time.h"


#undef KEY
#if defined(__i386)
# define KEY '_','_','i','3','8','6'
#elif defined(__x86_64)
# define KEY '_','_','x','8','6','_','6','4'
#elif defined(__ppc__)
# define KEY '_','_','p','p','c','_','_'
#elif defined(__ppc64__)
# define KEY '_','_','p','p','c','6','4','_','_'
#endif

#define SIZE (sizeof(time_t))
char info_size[] =  {'I', 'N', 'F', 'O', ':', 's','i','z','e','[',
  ('0' + ((SIZE / 10000)%10)),
  ('0' + ((SIZE / 1000)%10)),
  ('0' + ((SIZE / 100)%10)),
  ('0' + ((SIZE / 10)%10)),
  ('0' +  (SIZE    % 10)),
  ']',
#ifdef KEY
  ' ','k','e','y','[', KEY, ']',
#endif
  '\0'};

#ifdef __CLASSIC_C__
int main(argc, argv) int argc; char *argv[];
#else
int main(int argc, char *argv[])
#endif
{
  int require = 0;
  require += info_size[argc];
  (void)argv;
  return require;
}






On Thu, Aug 18, 2016 at 11:50 AM, J Decker <d3ck0r at gmail.com> wrote:

> I was trying to add some libraries for CMAKE_REQUIRED_LIBRARIES to be able
> to find more symbols, but changing that didn't cause the
> check_function-0exists to re-run; is there a shorter way to get it to
> re-run without deleting CMakeCache.txt?
> I'm not abject to manually editing files; I had tried to remove just the
> cached variable reference, but that didn't help.
>
> Same for check_type_size() I guess
>
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