cmake SNMALLOC_PLATFORM_HAS_GETENTROPY examples

Jackarain/proxy third_party/snmalloc/CMakeLists.txt :111 

CHECK_CXX_SOURCE_COMPILES("
#if __has_include(<unistd.h>)
#  include <unistd.h>
#endif
#if __has_include(<sys/random.h>)
#  include <sys/random.h>
#endif
int main() {
  int entropy = 0;
  int res = getentropy(&entropy, sizeof(entropy));
  return res;
}
" SNMALLOC_PLATFORM_HAS_GETENTROPY)

CTSRD-CHERI/cheribsd contrib/subrepo-snmalloc/CMakeLists.txt :107 

CHECK_CXX_SOURCE_COMPILES("
#if __has_include(<unistd.h>)
#  include <unistd.h>
#endif
#if __has_include(<sys/random.h>)
#  include <sys/random.h>
#endif
int main() {
  int entropy = 0;
  int res = getentropy(&entropy, sizeof(entropy));
  return res;
}
" SNMALLOC_PLATFORM_HAS_GETENTROPY)