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According to Eric Lemings on 4/9/2007 1:32 PM:
> 2. An Autoconf macro that checks whether a given type is a built-in
> type or not. This macro is similar to AC_CHECK_TYPE except that it
> performs action-if-built-in only if the type is a built-in type and
> action-if-not-built-in if the type is not defined or not a built-in
> type.
> (Possibly the same as _AC_TYPE_CHECK_NEW without any includes at all.)
Don't use undocumented autoconf internals (unless you are writing a patch
for autoconf itself). The _AC namespace is reserved, and should not
appear in your configure.ac.
But what's wrong with AC_CHECK_TYPE([int], [action-if-builtin],
[action-if-not], [])? In other words, explicitly tell AC_CHECK_TYPE to
use no includes.
>
> 3. An Autoconf macro that defines a preprocessor name with the
> fundamental type as an existing type definition.
>
> FOO_REDEFINE_TYPE(FOO_INT8_T, int8_t, AC_INCLUDES_DEFAULT)
>
> and the type __sys_int8_t is defined in <sys/types.h> as
>
> typedef char __sys_int8_t int8_t;
Typo, I hope.
Why are you doing this? Avoiding header files seems like overkill; if
they are there and they work, use them. Meanwhile, based on your mention
of int8_t, you may be interested in the gnulib stdint module, which
provides a good example of how to build a header that provides all of the
[u]int{8,16,32}_t types and friends using autoconf.
http://www.gnu.org/software/gnulib/MODULES.html#module=stdint
- --
Don't work too hard, make some time for fun as well!
Eric Blake ebb9@xxxxxxx
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