On Friday 14 April 2000, at 13 h 55, the keyboard of Stephane Bortzmeyer
<[EMAIL PROTECTED]> wrote:
> Does anyone have an already existing macro to check the types of sys_nerr and
> sys_errlist? My hand-crafted config.h contains:
Thanks to "T.E.Dickey" <[EMAIL PROTECTED]>, maintainer of vile and lynx, here is a
working acinclude.m4. I now do in configure.in:
CF_SYS_ERRLIST
and in my headers:
/* These entities should be in errno.h but some systems do not define
them. */
#ifdef DECL_SYS_ERRLIST
extern char *sys_errlist[];
#endif
#ifdef DECL_SYS_NERR
extern int sys_nerr;
#endif
dnl ---------------------------------------------------------------------------
dnl Make an uppercase version of a variable
dnl $1=uppercase($2)
AC_DEFUN([CF_UPPER],
[
changequote(,)dnl
$1=`echo $2 | tr '[a-z]' '[A-Z]'`
changequote([,])dnl
])dnl
dnl ---------------------------------------------------------------------------
dnl Check for existence of external data in the current set of libraries. If
dnl we can modify it, it's real enough.
dnl $1 = the name to check
dnl $2 = its type
AC_DEFUN([CF_CHECK_EXTERN_DATA],
[
AC_MSG_CHECKING(if external $1 exists)
AC_CACHE_VAL(cf_cv_have_$1,[
AC_TRY_LINK([
#undef $1
extern $2 $1;
],
[$1 = 2],
[eval 'cf_cv_have_'$1'=yes'],
[eval 'cf_cv_have_'$1'=no'])])
eval 'cf_result=$cf_cv_have_'$1
AC_MSG_RESULT($cf_result)
if test "$cf_result" = yes ; then
eval 'cf_result=HAVE_'$1
CF_UPPER(cf_result,$cf_result)
AC_DEFINE_UNQUOTED($cf_result)
fi
])dnl
dnl ---------------------------------------------------------------------------
dnl Check for data that is usually declared in <stdio.h> or <errno.h>, e.g.,
dnl the 'errno' variable. Define a DECL_xxx symbol if we must declare it
dnl ourselves.
dnl
dnl (I would use AC_CACHE_CHECK here, but it will not work when called in a
dnl loop from CF_SYS_ERRLIST).
dnl
dnl $1 = the name to check
AC_DEFUN([CF_CHECK_ERRNO],
[
AC_MSG_CHECKING(if external $1 is declared)
AC_CACHE_VAL(cf_cv_dcl_$1,[
AC_TRY_COMPILE([
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <stdio.h>
#include <sys/types.h>
#include <errno.h> ],
[long x = (long) $1],
[eval 'cf_cv_dcl_'$1'=yes'],
[eval 'cf_cv_dcl_'$1'=no]')
])
eval 'cf_result=$cf_cv_dcl_'$1
AC_MSG_RESULT($cf_result)
if test "$cf_result" = no ; then
eval 'cf_result=DECL_'$1
CF_UPPER(cf_result,$cf_result)
AC_DEFINE_UNQUOTED($cf_result)
fi
# It's possible (for near-UNIX clones) that the data doesn't exist
CF_CHECK_EXTERN_DATA($1,int)
])dnl
dnl ---------------------------------------------------------------------------
dnl Check for declaration of sys_nerr and sys_errlist in one of stdio.h and
dnl errno.h. Declaration of sys_errlist on BSD4.4 interferes with our
dnl declaration. Reported by Keith Bostic.
AC_DEFUN([CF_SYS_ERRLIST],
[
for cf_name in sys_nerr sys_errlist
do
CF_CHECK_ERRNO($cf_name)
done
])dnl
