cmake HAVE_CXX_ISINF examples

google/mysql-protobuf configure.cmake :512 

CHECK_CXX_SOURCE_COMPILES(
"#include  <math.h>
int main() { 
  isinf(0.0); 
  return 0;
}" HAVE_CXX_ISINF)

mongodb/mongo-bi-connector-odbc-driver configure.cmake :544 

CHECK_CXX_SOURCE_COMPILES(
"#include  <math.h>
int main() { 
  isinf(0.0); 
  return 0;
}" HAVE_CXX_ISINF)