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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 section Printing Messages.
- Macro: AC_DIAGNOSE (category, message)
-
Report message as a warning (or as an error if requested by the
user) if it falls into the category. You are encouraged to use
standard categories, which currently include:
- `all'
-
messages that don't fall into one of the following category. 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
section Using autoconf to Create configure.
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