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dnl $Id: check-declaration.m4,v 1.3 1999/03/01 13:03:08 joda Exp $
dnl
dnl
dnl Check if we need the declaration of a variable
dnl
dnl AC_HAVE_DECLARATION(includes, variable)
AC_DEFUN(AC_CHECK_DECLARATION, [
AC_MSG_CHECKING([if $2 is properly declared])
AC_CACHE_VAL(ac_cv_var_$2_declaration, [
AC_TRY_COMPILE([$1
extern struct { int foo; } $2;],
[$2.foo = 1;],
eval "ac_cv_var_$2_declaration=no",
eval "ac_cv_var_$2_declaration=yes")
])
define(foo, [HAVE_]translit($2, [a-z], [A-Z])[_DECLARATION])
AC_MSG_RESULT($ac_cv_var_$2_declaration)
if eval "test \"\$ac_cv_var_$2_declaration\" = yes"; then
AC_DEFINE(foo, 1, [define if your system declares $2])
fi
undefine([foo])
])
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