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9.3 Reporting Messages
When macros statically diagnose abnormal situations, benign or fatal,
they should report them using these macros. For dynamic issues, i.e.,
when configure is run, see Printing Messages.
— Macro: AC_DIAGNOSE ( category, message)
Report message as a warning (or as an error if requested by the
user) if warnings of the category are turned on. You are
encouraged to use standard categories, which currently include:
- ‘all’
- messages that don't fall into one of the following categories. Use of an
empty category is equivalent.
- ‘cross’
- related to cross compilation issues.
- ‘obsolete’
- use of an obsolete construct.
- ‘syntax’
- dubious syntactic constructs, incorrectly ordered macro calls.
— Macro: AC_WARNING ( message)
Equivalent to ‘AC_DIAGNOSE([syntax], message)’, but you are
strongly encouraged to use a finer grained category.
— Macro: AC_FATAL ( message)
Report a severe error message, and have autoconf die.
When the user runs ‘autoconf -W error’, warnings from
AC_DIAGNOSE and AC_WARNING are reported as error, see
autoconf Invocation.
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