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Re: AIX 5.1 xlc va_copy (stdarg patch)


From: Bruno Haible
Subject: Re: AIX 5.1 xlc va_copy (stdarg patch)
Date: Tue, 11 Mar 2008 05:30:02 +0100
User-agent: KMail/1.5.4

Peter O'Gorman wrote:
> Looks like this breaks on AIX 4.3.3 :(
> 
> gl_CHECK_NEXT_HEADERS fails to find the absolute file name for
> stddef.h, it finds the empty string and substitutes
> 
> #include ""
> 
> into the generated stdarg.h
> 
> It looks like gl_CHECK_NEXT_HEADERS fails for headers that do not
> declare any functions. stdarg.h only defines macros :(

I'm documenting this limitation:

2008-03-10  Bruno Haible  <address@hidden>

        * m4/include_next.m4 (gl_CHECK_NEXT_HEADERS): Document a restriction.
        * m4/absolute-header.m4 (gl_ABSOLUTE_HEADER): Likewise.
        Reported by Peter O'Gorman <address@hidden>.

*** m4/absolute-header.m4.orig  2008-03-11 05:26:35.000000000 +0100
--- m4/absolute-header.m4       2008-03-11 04:26:43.000000000 +0100
***************
*** 1,5 ****
! # absolute-header.m4 serial 7
! dnl Copyright (C) 2006, 2007 Free Software Foundation, Inc.
  dnl This file is free software; the Free Software Foundation
  dnl gives unlimited permission to copy and/or distribute it,
  dnl with or without modifications, as long as this notice is preserved.
--- 1,5 ----
! # absolute-header.m4 serial 8
! dnl Copyright (C) 2006-2008 Free Software Foundation, Inc.
  dnl This file is free software; the Free Software Foundation
  dnl gives unlimited permission to copy and/or distribute it,
  dnl with or without modifications, as long as this notice is preserved.
***************
*** 16,21 ****
--- 16,24 ----
  # The three "///" are to pacify Sun C 5.8, which otherwise would say
  # "warning: #include of /usr/include/... may be non-portable".
  # Use `""', not `<>', so that the /// cannot be confused with a C99 comment.
+ # Note: This macro assumes that the header file is not empty after
+ # preprocessing, i.e. it does not only define preprocessor macros but also
+ # provides some type/enum definitions or function/variable declarations.
  AC_DEFUN([gl_ABSOLUTE_HEADER],
  [AC_LANG_PREPROC_REQUIRE()dnl
  AC_FOREACH([gl_HEADER_NAME], [$1],
*** m4/include_next.m4.orig     2008-03-11 05:26:36.000000000 +0100
--- m4/include_next.m4  2008-03-11 04:37:46.000000000 +0100
***************
*** 1,5 ****
! # include_next.m4 serial 4
! dnl Copyright (C) 2006, 2007 Free Software Foundation, Inc.
  dnl This file is free software; the Free Software Foundation
  dnl gives unlimited permission to copy and/or distribute it,
  dnl with or without modifications, as long as this notice is preserved.
--- 1,5 ----
! # include_next.m4 serial 5
! dnl Copyright (C) 2006-2008 Free Software Foundation, Inc.
  dnl This file is free software; the Free Software Foundation
  dnl gives unlimited permission to copy and/or distribute it,
  dnl with or without modifications, as long as this notice is preserved.
***************
*** 63,68 ****
--- 63,71 ----
  # The three "///" are to pacify Sun C 5.8, which otherwise would say
  # "warning: #include of /usr/include/... may be non-portable".
  # Use `""', not `<>', so that the /// cannot be confused with a C99 comment.
+ # Note: This macro assumes that the header file is not empty after
+ # preprocessing, i.e. it does not only define preprocessor macros but also
+ # provides some type/enum definitions or function/variable declarations.
  AC_DEFUN([gl_CHECK_NEXT_HEADERS],
  [
    AC_REQUIRE([gl_INCLUDE_NEXT])





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