Fix the test for fsetxattr and strerror_r tests in CMake to work without compiling

#ifdef HAVE_GLIBC_STRERROR_R

#include <string.h>

#include <errno.h>

void check(char c) {}

int

main () {

  char buffer[1024]; /* big enough to play with */

  char *string =

    strerror_r(EACCES, buffer, sizeof(buffer));

    /* this should've returned a string */

    if(!string || !string[0])

      return 99;

  char buffer[1024];

  // This will not compile if strerror_r does not return a char*

  check(strerror_r(EACCES, buffer, sizeof(buffer))[0]);

  return 0;

}

#endif

#ifdef HAVE_POSIX_STRERROR_R

#include <string.h>

#include <errno.h>

// float, because a pointer can't be implicitly cast to float

void check(float f) {}

int

main () {

  char buffer[1024]; /* big enough to play with */

  int error =

    strerror_r(EACCES, buffer, sizeof(buffer));

    /* This should've returned zero, and written an error string in the

       buffer.*/

    if(!buffer[0] || error)

      return 99;

  char buffer[1024];

  // This will not compile if strerror_r does not return an int

  check(strerror_r(EACCES, buffer, sizeof(buffer)));

  return 0;

}

#endif

check_symbol_exists(fsetxattr "${CURL_INCLUDES}" HAVE_FSETXATTR)

if(HAVE_FSETXATTR)

  foreach(CURL_TEST HAVE_FSETXATTR_5 HAVE_FSETXATTR_6)

    curl_internal_test_run(${CURL_TEST})

    curl_internal_test(${CURL_TEST})

  endforeach(CURL_TEST)

endif(HAVE_FSETXATTR)

    HAVE_GLIBC_STRERROR_R

    HAVE_POSIX_STRERROR_R

    )

  curl_internal_test_run(${CURL_TEST})

  curl_internal_test(${CURL_TEST})

endforeach(CURL_TEST)

# Check for reentrant