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Viewing changes to m4/include_next.m4

  • Committer: brian
  • Date: 2008-06-25 05:29:13 UTC
  • Revision ID: brian@localhost.localdomain-20080625052913-6upwo0jsrl4lnapl
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m4/include_next.m4
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# include_next.m4 serial 6
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dnl Copyright (C) 2006-2008 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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dnl From Paul Eggert and Derek Price.
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AC_DEFUN([gl_INCLUDE_NEXT],
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[
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  AC_LANG_PREPROC_REQUIRE()
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  AC_CACHE_CHECK([whether the preprocessor supports include_next],
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    [gl_cv_have_include_next],
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    [rm -rf conftestd1 conftestd2
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     mkdir conftestd1 conftestd2
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     cat <<EOF > conftestd1/conftest.h
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#define DEFINED_IN_CONFTESTD1
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#include_next <conftest.h>
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#ifdef DEFINED_IN_CONFTESTD2
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int foo;
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#else
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#error "include_next doesn't work"
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#endif
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EOF
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     cat <<EOF > conftestd2/conftest.h
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#ifndef DEFINED_IN_CONFTESTD1
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#error "include_next test doesn't work"
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#endif
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#define DEFINED_IN_CONFTESTD2
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EOF
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     save_CPPFLAGS="$CPPFLAGS"
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     CPPFLAGS="$CPPFLAGS -Iconftestd1 -Iconftestd2"
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     AC_COMPILE_IFELSE([#include <conftest.h>],
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       [gl_cv_have_include_next=yes],
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       [gl_cv_have_include_next=no])
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     CPPFLAGS="$save_CPPFLAGS"
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     rm -rf conftestd1 conftestd2
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    ])
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  if test $gl_cv_have_include_next = yes; then
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    dnl FIXME: Remove HAVE_INCLUDE_NEXT and update everything that uses it
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    dnl to use @INCLUDE_NEXT@ instead.
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    AC_DEFINE([HAVE_INCLUDE_NEXT], 1,
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              [Define if your compiler supports the #include_next directive.])
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    INCLUDE_NEXT=include_next
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  else
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    INCLUDE_NEXT=include
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  fi
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  AC_SUBST([INCLUDE_NEXT])
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])
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# gl_CHECK_NEXT_HEADERS(HEADER1 HEADER2 ...)
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# ------------------------------------------
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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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# That way, a header file with the following line:
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#       #@INCLUDE_NEXT@ @NEXT_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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# 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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# Use `""', not `<>', so that the /// cannot be confused with a C99 comment.
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# Note: This macro assumes that the header file is not empty after
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# preprocessing, i.e. it does not only define preprocessor macros but also
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# provides some type/enum definitions or function/variable declarations.
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AC_DEFUN([gl_CHECK_NEXT_HEADERS],
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[
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  AC_REQUIRE([gl_INCLUDE_NEXT])
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  AC_CHECK_HEADERS_ONCE([$1])
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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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     if test $gl_cv_have_include_next = yes; then
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       AS_VAR_SET([gl_next_header], ['<'gl_HEADER_NAME'>'])
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     else
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       AC_CACHE_CHECK(
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         [absolute name of <]m4_quote(m4_defn([gl_HEADER_NAME]))[>],
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         m4_quote(m4_defn([gl_next_header])),
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         [AS_VAR_PUSHDEF([gl_header_exists],
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                         [ac_cv_header_]m4_quote(m4_defn([gl_HEADER_NAME])))
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          if test AS_VAR_GET(gl_header_exists) = yes; then
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            AC_LANG_CONFTEST(
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              [AC_LANG_SOURCE(
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                 [[#include <]]m4_dquote(m4_defn([gl_HEADER_NAME]))[[>]]
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               )])
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            dnl eval is necessary to expand ac_cpp.
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            dnl Ultrix and Pyramid sh refuse to redirect output of eval,
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            dnl so use subshell.
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            AS_VAR_SET([gl_next_header],
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              ['"'`(eval "$ac_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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     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_VAR_GET([gl_next_header])])
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     AS_VAR_POPDEF([gl_next_header])])
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])