claws-mail/m4/check-type.m4

dnl CLAWS_CHECK_TYPE(TYPE, DEFAULT [, INCLUDES, COMMENT])
dnl
dnl Like AC_CHECK_TYPE, but in addition to `sys/types.h', `stdlib.h' and
dnl `stddef.h' checks files included by INCLUDES, which should be a
dnl series of #include statements.  If TYPE is not defined, define it
dnl to DEFAULT.
dnl
AC_DEFUN([CLAWS_CHECK_TYPE],
[AC_REQUIRE([AC_HEADER_STDC])dnl
AC_MSG_CHECKING(for $1)
AC_CACHE_VAL(claws_cv_type_$1,
[AC_TRY_COMPILE([
#include <sys/types.h>
#if STDC_HEADERS
#include <stdlib.h>
#include <stddef.h>
#endif
$3
], [
#undef $1
int a = sizeof($1);
], claws_cv_type_$1=yes, claws_cv_type_$1=no)])dnl
AC_MSG_RESULT($claws_cv_type_$1)
if test $claws_cv_type_$1 = no; then
  AC_DEFINE($1, $2, $4)
fi
])