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.. Copyright (C) 2024-2025 Free Software Foundation, Inc.
Originally contributed by David Malcolm <dmalcolm@redhat.com>
This is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see
<https://www.gnu.org/licenses/>.
.. default-domain:: c
Tutorial part 5: warnings
=========================
So far we've only emitted errors, but other kinds of diagnostic are possible,
such as warnings.
We can select different kinds of diagnostic via :enum:`diagnostic_level`
when calling :func:`diagnostic_begin`:
.. literalinclude:: ../../../testsuite/libgdiagnostics.dg/test-warning.c
:language: c
:start-after: /* begin quoted source */
:end-before: /* end quoted source */
On compiling and running the program, we should get output similar to::
test-warning.c:17:11: warning: this is a warning
17 | #include <foo.h>
| ^~~~~
Various severities are possible, see :enum:`diagnostic_level` for more
information.
In :doc:`the next section of the tutorial <06-fix-it-hints>` we'll look
at adding fix-it hints to diagnostics.
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