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Viewing changes to lib/gl/m4/include_next.m4

  • Committer: Bazaar Package Importer
  • Author(s): Steve Langasek
  • Date: 2011-05-20 13:07:18 UTC
  • mfrom: (12.1.11 sid)
  • Revision ID: james.westby@ubuntu.com-20110520130718-db41dybbanzfvlji
Tags: 2.10.5-1ubuntu1
* Merge from Debian unstable, remaining changes:
  - Fix build failure with --no-add-needed.
  - Build for multiarch.

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lib/gl/m4/include_next.m4
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# include_next.m4 serial 12
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dnl Copyright (C) 2006-2009 Free Software Foundation, Inc.
 
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# include_next.m4 serial 14
 
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dnl Copyright (C) 2006-2010 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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# For each arg foo.h, if #include_next works, define NEXT_FOO_H to be
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# '<foo.h>'; otherwise define it to be
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# '"///usr/include/foo.h"', or whatever other absolute file name is suitable.
 
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# Also, if #include_next works as first preprocessing directive in a file,
 
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# define NEXT_AS_FIRST_DIRECTIVE_FOO_H to be '<foo.h>'; otherwise define it to
 
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# be
 
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# '"///usr/include/foo.h"', or whatever other absolute file name is suitable.
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# That way, a header file with the following line:
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#       #@INCLUDE_NEXT@ @NEXT_FOO_H@
 
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#       #@INCLUDE_NEXT@ @NEXT_FOO_H@
 
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# or
 
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#       #@INCLUDE_NEXT_AS_FIRST_DIRECTIVE@ @NEXT_AS_FIRST_DIRECTIVE_FOO_H@
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# behaves (after sed substitution) as if it contained
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#       #include_next <foo.h>
 
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#       #include_next <foo.h>
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# even if the compiler does not support include_next.
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# The three "///" are to pacify Sun C 5.8, which otherwise would say
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# "warning: #include of /usr/include/... may be non-portable".
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  m4_foreach_w([gl_HEADER_NAME], [$1],
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    [AS_VAR_PUSHDEF([gl_next_header],
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                    [gl_cv_next_]m4_quote(m4_defn([gl_HEADER_NAME])))
 
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                    [gl_cv_next_]m4_defn([gl_HEADER_NAME]))
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     if test $gl_cv_have_include_next = yes; then
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       AS_VAR_SET([gl_next_header], ['<'gl_HEADER_NAME'>'])
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     else
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       AC_CACHE_CHECK(
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         [absolute name of <]m4_quote(m4_defn([gl_HEADER_NAME]))[>],
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         m4_quote(m4_defn([gl_next_header])),
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         [AS_VAR_PUSHDEF([gl_header_exists],
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                         [ac_cv_header_]m4_quote(m4_defn([gl_HEADER_NAME])))
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          if test AS_VAR_GET(gl_header_exists) = yes; then
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            AC_LANG_CONFTEST(
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              [AC_LANG_SOURCE(
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                 [[#include <]]m4_dquote(m4_defn([gl_HEADER_NAME]))[[>]]
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               )])
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            dnl AIX "xlc -E" and "cc -E" omit #line directives for header files
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            dnl that contain only a #include of other header files and no
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            dnl non-comment tokens of their own. This leads to a failure to
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            dnl detect the absolute name of <dirent.h>, <signal.h>, <poll.h>
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            dnl and others. The workaround is to force preservation of comments
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            dnl through option -C. This ensures all necessary #line directives
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            dnl are present. GCC supports option -C as well.
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            case "$host_os" in
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              aix*) gl_absname_cpp="$ac_cpp -C" ;;
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              *)    gl_absname_cpp="$ac_cpp" ;;
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            esac
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            dnl eval is necessary to expand gl_absname_cpp.
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            dnl Ultrix and Pyramid sh refuse to redirect output of eval,
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            dnl so use subshell.
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            AS_VAR_SET([gl_next_header],
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              ['"'`(eval "$gl_absname_cpp conftest.$ac_ext") 2>&AS_MESSAGE_LOG_FD |
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               sed -n '\#/]m4_quote(m4_defn([gl_HEADER_NAME]))[#{
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                 s#.*"\(.*/]m4_quote(m4_defn([gl_HEADER_NAME]))[\)".*#\1#
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                 s#^/[^/]#//&#
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                 p
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                 q
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               }'`'"'])
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          else
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            AS_VAR_SET([gl_next_header], ['<'gl_HEADER_NAME'>'])
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          fi
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          AS_VAR_POPDEF([gl_header_exists])])
 
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         [absolute name of <]m4_defn([gl_HEADER_NAME])[>],
 
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         m4_defn([gl_next_header]),
 
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         [AS_VAR_PUSHDEF([gl_header_exists],
 
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                         [ac_cv_header_]m4_defn([gl_HEADER_NAME]))
 
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          if test AS_VAR_GET(gl_header_exists) = yes; then
 
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            AC_LANG_CONFTEST(
 
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              [AC_LANG_SOURCE(
 
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                 [[#include <]]m4_dquote(m4_defn([gl_HEADER_NAME]))[[>]]
 
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               )])
 
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            dnl AIX "xlc -E" and "cc -E" omit #line directives for header files
 
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            dnl that contain only a #include of other header files and no
 
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            dnl non-comment tokens of their own. This leads to a failure to
 
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            dnl detect the absolute name of <dirent.h>, <signal.h>, <poll.h>
 
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            dnl and others. The workaround is to force preservation of comments
 
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            dnl through option -C. This ensures all necessary #line directives
 
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            dnl are present. GCC supports option -C as well.
 
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            case "$host_os" in
 
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              aix*) gl_absname_cpp="$ac_cpp -C" ;;
 
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              *)    gl_absname_cpp="$ac_cpp" ;;
 
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            esac
 
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            dnl eval is necessary to expand gl_absname_cpp.
 
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            dnl Ultrix and Pyramid sh refuse to redirect output of eval,
 
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            dnl so use subshell.
 
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            AS_VAR_SET([gl_next_header],
 
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              ['"'`(eval "$gl_absname_cpp conftest.$ac_ext") 2>&AS_MESSAGE_LOG_FD |
 
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               sed -n '\#/]m4_defn([gl_HEADER_NAME])[#{
 
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                 s#.*"\(.*/]m4_defn([gl_HEADER_NAME])[\)".*#\1#
 
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                 s#^/[^/]#//&#
 
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                 p
 
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                 q
 
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               }'`'"'])
 
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          else
 
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            AS_VAR_SET([gl_next_header], ['<'gl_HEADER_NAME'>'])
 
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          fi
 
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          AS_VAR_POPDEF([gl_header_exists])])
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     fi
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     AC_SUBST(
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       AS_TR_CPP([NEXT_]m4_quote(m4_defn([gl_HEADER_NAME]))),
 
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       AS_TR_CPP([NEXT_]m4_defn([gl_HEADER_NAME])),
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       [AS_VAR_GET([gl_next_header])])
 
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     if test $gl_cv_have_include_next = yes || test $gl_cv_have_include_next = buggy; then
 
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       # INCLUDE_NEXT_AS_FIRST_DIRECTIVE='include_next'
 
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       gl_next_as_first_directive='<'gl_HEADER_NAME'>'
 
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     else
 
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       # INCLUDE_NEXT_AS_FIRST_DIRECTIVE='include'
 
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       gl_next_as_first_directive=AS_VAR_GET([gl_next_header])
 
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     fi
 
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     AC_SUBST(
 
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       AS_TR_CPP([NEXT_AS_FIRST_DIRECTIVE_]m4_defn([gl_HEADER_NAME])),
 
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       [$gl_next_as_first_directive])
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     AS_VAR_POPDEF([gl_next_header])])
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])