# Troubleshooting

- Using compiler options on calls to the Logtalk compiling and loading predicates does not work!

- Gecko-based browsers (e.g., Firefox) show non-rendered HTML entities when browsing XML documenting files!

- Compiling a source file results in errors or warnings but the Logtalk compiler reports a successful compilation with zero errors and zero warnings!

## Using compiler options on calls to the Logtalk compiling and loading predicates does not work!

Using compiler options on calls to the Logtalk logtalk_compile/2 and logtalk_load/2 built-in predicates only apply to the file being compiled. If the first argument is a loader file, the compiler options will only be used in the compilation of the loader file itself, not in the compilation of the files loaded by the loader file. The solution is to edit the loader file and add the compiler options to the calls that compile/load the individual files.

## Gecko-based browsers (e.g., Firefox) show non-rendered HTML entities when browsing XML documenting files!

Using Gecko-based browsers (e.g., Firefox) show non-rendered HTML entities (e.g., `&ndash;`) when browsing XML documenting files after running the `lgt2xml` shell script in the directory containing the XML documenting files. This is a consequence of the lack of support for the `disable-output-escaping` attribute in the browser XSLT processor. The workaround is to use another browser (e.g., Safari or Opera) or to use instead the `lgt2html` shell script in the directory containing the XML documenting files to convert them to (X)HTML files for browsing.

## Compiling a source file results in errors or warnings but the Logtalk compiler reports a successful compilation with zero errors and zero warnings!

This may happen when your Prolog compiler implementation of the ISO Prolog standard `write_canonical/2` built-in predicate is buggy and writes terms that cannot be read back when consulting the intermediate Prolog files generated by the Logtalk compiler. Often, syntax errors found when consulting result in error messages but not in exceptions as the Prolog compiler tries to continue the compilation despite the problems found. As the Logtalk compiler relies on the exception mechanisms to catch compilation problems, it may report zero errors and zero warnings despite the error messages. Send a bug report to the Prolog compiler developers asking them to fix the `write_canonical/2` buggy implementation.