autoconf: Changed Macros

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1 18.5.3 Changed Macros
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1 Many of the macros were renamed in Autoconf version 2.  You can still
1 use the old names, but the new ones are clearer, and it's easier to find
1 the documentation for them.  ⇒Obsolete Macros, for a table
1 showing the new names for the old macros.  Use the `autoupdate' program
11 to convert your `configure.ac' to using the new macro names.  ⇒
 autoupdate Invocation.
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1    Some macros have been superseded by similar ones that do the job
1 better, but are not call-compatible.  If you get warnings about calling
1 obsolete macros while running `autoconf', you may safely ignore them,
1 but your `configure' script generally works better if you follow the
1 advice that is printed about what to replace the obsolete macros with.
1 In particular, the mechanism for reporting the results of tests has
1 changed.  If you were using `echo' or `AC_VERBOSE' (perhaps via
1 `AC_COMPILE_CHECK'), your `configure' script's output looks better if
11 you switch to `AC_MSG_CHECKING' and `AC_MSG_RESULT'.  ⇒Printing
 Messages.  Those macros work best in conjunction with cache
1 variables.  ⇒Caching Results.
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