Mark D. Baushke wrote:
> Yes. I am told that /usr/include/stdint.h has the following:
>
> #ifndef __c99
> #error This header file is to be used only for c99 mode compilations
> #else
>
> #endif
>
> The #else clause contains the typedefs one normally assumes are in
> <stdint.h>.
>
> The <inttypes.h> file similarly does this:
>
> #if !(defined(__c99))
> /* ... all of the c89 typedefs go here */
> #else
>
> #include <stdint.h>
> #include <wchar.h>
> /* ... all of the rest of the c99 stuff for <inttypes.h> goes here */
> #endif /* __c99 */
>
> > ! - in c89 mode, <stdint.h> spews warnings and <inttypes.h> too
> > ! defines all types and macros that are defined in <stdint.h>.
> > ! So we rely only on <inttypes.h> (included above). */
>
> Yes, the #error in c89 mode is considered a warning under normal
> circumstances.
But unlike what Larry and explained in the other mails, there is
an additional problem: In c89 mode, <inttypes.h> does not define all
of the contents of <stdint.h>. It does not define int_least8_t,
for example.
What to do in this case? Use the <stdint.h> because it has more types
defined, and tell people to ignore the warnings? Or not?
I'm trying to not include <stdint.h>, like you suggest. Because
- gnulib's <stdint.h> shadows the system's one. In other words, it's
hard to come into a situation where the system's <stdint.h> will
be used.
- Anyone using the system's <stdint.h> is likely to stop doing so,
because of the #error warnings.
> I suppose an alternative would be
>
> #if @HAVE_STDINT_H@
> # if (!defined(__sgi) || defined(__c99)) && @HAVE_INTTYPES_H@
> # include @FULL_PATH_STDINT_H
> # endif
> #endif
The "&& @HAVE_INTTYPES_H@" puts in the assumption that all systems
that have an <stdint.h> also have an <inttypes.h>. Quite possible.
But the less assumptions we need to make, the better.
Bruno
*** lib/stdint_.h 26 Jun 2006 13:06:51 -0000 1.20
--- lib/stdint_.h 26 Jun 2006 16:52:56 -0000
***************
*** 67,73 ****
#endif
#if @HAVE_STDINT_H@
/* Other systems may have an incomplete <stdint.h>. */
! # include @FULL_PATH_STDINT_H@
#endif
/* 7.18.1.1. Exact-width integer types */
--- 67,82 ----
#endif
#if @HAVE_STDINT_H@
/* Other systems may have an incomplete <stdint.h>. */
! /* On some versions of IRIX, the SGI C compiler comes with an <stdint.h>,
! but
! - in c99 mode, <inttypes.h> includes <stdint.h>,
! - in c89 mode, <stdint.h> spews warnings. <inttypes.h> defines only
! a subset of the types and macros that are defined in <stdint.h>.
! So we rely only on <inttypes.h> (included above). It means that in
! c89 mode, we shadow the contents of warning-spewing <stdint.h>. */
! # if !(defined(__sgi) && @HAVE_INTTYPES_H@ && !defined(_c99))
! # include @FULL_PATH_STDINT_H@
! # endif
#endif
/* 7.18.1.1. Exact-width integer types */
*** m4/stdint.m4 26 Jun 2006 13:06:51 -0000 1.9
--- m4/stdint.m4 26 Jun 2006 16:52:56 -0000
***************
*** 1,4 ****
! # stdint.m4 serial 9
dnl Copyright (C) 2001-2002, 2004-2006 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
--- 1,4 ----
! # stdint.m4 serial 10
dnl Copyright (C) 2001-2002, 2004-2006 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
***************
*** 105,111 ****
#if (defined(__hpux) || defined(_AIX)) && HAVE_INTTYPES_H
# include FULL_PATH_INTTYPES_H
#endif
! #if HAVE_STDINT_H
# include FULL_PATH_STDINT_H
#endif
'
--- 105,111 ----
#if (defined(__hpux) || defined(_AIX)) && HAVE_INTTYPES_H
# include FULL_PATH_INTTYPES_H
#endif
! #if HAVE_STDINT_H && !(defined(__sgi) && HAVE_INTTYPES_H && !defined(_c99))
# include FULL_PATH_STDINT_H
#endif
'
