[CMake] Compile/install on HPUX on ia64 (Itanium)

[Brad King]

David Akdikmen wrote:
> First problem is that ATTR_UNUSED is being expanded to __attribute__(..)
> which is a GNU compiler feature.  Looks like the 
> 
> TRY_COMPILE_FROM_SOURCE("int x __attribute__((__unused__))"
> 
> In Utilities/cmxmlrpc/CMakeLists.txt is succeeding when it should not.

Look for a file called CMakeOutput.log in the build tree.  It should be 
under the CMakeFiles directory.  That log file should contain the 
compiler output from the successful build of that try-compile source. 
There is also a CMakeError.log containing the output of try-comiples 
that failed.  Make sure this try-compile appears in one of them.  It may 
tell you why the wrong result was obtained.

-Brad