PDF versions of the XL C/C++ product manuals are available in the /doc/LANG/pdf/ directory of the installation media (either product CD or electronic package).
After default installation, the PDF documentation can be found in the /opt/IBM/xlC/13.1.0/doc/LANG/pdf/ directory. For non-default installations, the PDF documentation is located in the /target_dir/opt/IBM/xlC/13.1.0/doc/LANG/pdf/ directory, where target_dir is the target directory for installation specified by the -b option of the non-default installation script.
LANG can be en_US, ja_JP or zh_CN.