Documentation

[Reissner]

It would be helpful to find something on the possible errors and warnings logged into *.ilg.
A bit like section 3 of the makeindex manual from https://ctan.org/pkg/makeindex.
I am particularly interested in that because I am working on some build tool.

[t-tk]

I have not made list of warning/error messages.
I can say a short comment now.
The messages are generated at the following code ::

warning ::
I think you will find them by checking warn_printf() in *.c .
Some strings of warning messages are generated by SPRINTF prior to warn_printf() .

error ::
I think you will find error exit by checking exit(253) exit(254) exit(255) in *.c.
The error message will be issued by verb_printf() or fprintf() prior to exit().

[Reissner]

Thank you for answering.. Is error always combined with exit code !=0?

I remember that makeindex prints some summary... at best, I find something upmendex and makeindex have in common.

I think, if errors, codes and also log output is specified as done for makeindex, manual section 3,
this is really realiable, more than having a look at the code,
because code is not specification.