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# include_next.m4 serial 4

dnl Copyright (C) 2006, 2007, 2009, 2010 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.

dnl From Paul Eggert and Derek Price.

AC_DEFUN([gl_INCLUDE_NEXT],

[

  AC_LANG_PREPROC_REQUIRE()

  AC_CACHE_CHECK([whether the preprocessor supports include_next],

    [gl_cv_have_include_next],

    [rm -rf conftestd1 conftestd2

     mkdir conftestd1 conftestd2

     cat <<EOF > conftestd1/conftest.h

#define DEFINED_IN_CONFTESTD1

#include_next <conftest.h>

#ifdef DEFINED_IN_CONFTESTD2

int foo;

#else

#error "include_next doesn't work"

#endif

EOF

     cat <<EOF > conftestd2/conftest.h

#ifndef DEFINED_IN_CONFTESTD1

#error "include_next test doesn't work"

#endif

#define DEFINED_IN_CONFTESTD2

EOF

     save_CPPFLAGS="$CPPFLAGS"

     CPPFLAGS="$CPPFLAGS -Iconftestd1 -Iconftestd2"

     AC_COMPILE_IFELSE([#include <conftest.h>],

       [gl_cv_have_include_next=yes],

       [gl_cv_have_include_next=no])

     CPPFLAGS="$save_CPPFLAGS"

     rm -rf conftestd1 conftestd2

    ])

  if test $gl_cv_have_include_next = yes; then

    dnl FIXME: Remove HAVE_INCLUDE_NEXT and update everything that uses it

    dnl to use @INCLUDE_NEXT@ instead.

    AC_DEFINE([HAVE_INCLUDE_NEXT], 1,

              [Define if your compiler supports the #include_next directive.])

    INCLUDE_NEXT=include_next

  else

    INCLUDE_NEXT=include

  fi

  AC_SUBST([INCLUDE_NEXT])

])

# gl_CHECK_NEXT_HEADERS(HEADER1 HEADER2 ...)

# ------------------------------------------

# For each arg foo.h, if #include_next works, define NEXT_FOO_H to be

# '<foo.h>'; otherwise define it to be

# '"///usr/include/foo.h"', or whatever other absolute file name is suitable.

# That way, a header file with the following line:

#       #@INCLUDE_NEXT@ @NEXT_FOO_H@

# behaves (after sed substitution) as if it contained

#       #include_next <foo.h>

# even if the compiler does not support include_next.

# 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.

AC_DEFUN([gl_CHECK_NEXT_HEADERS],

[

  AC_REQUIRE([gl_INCLUDE_NEXT])

  AC_CHECK_HEADERS_ONCE([$1])

  AC_FOREACH([gl_HEADER_NAME], [$1],

    [AS_VAR_PUSHDEF([gl_next_header],

                    [gl_cv_next_]m4_quote(m4_defn([gl_HEADER_NAME])))

     if test $gl_cv_have_include_next = yes; then

       AS_VAR_SET([gl_next_header], ['<'gl_HEADER_NAME'>'])

     else

       AC_CACHE_CHECK(

         [absolute name of <]m4_quote(m4_defn([gl_HEADER_NAME]))[>],

         m4_quote(m4_defn([gl_next_header])),

         [AS_VAR_PUSHDEF([gl_header_exists],

                         [ac_cv_header_]m4_quote(m4_defn([gl_HEADER_NAME])))

          if test AS_VAR_GET(gl_header_exists) = yes; then

            AC_LANG_CONFTEST(

              [AC_LANG_SOURCE(

                 [[#include <]]m4_dquote(m4_defn([gl_HEADER_NAME]))[[>]]

               )])

            dnl eval is necessary to expand ac_cpp.

            dnl Ultrix and Pyramid sh refuse to redirect output of eval,

            dnl so use subshell.

            AS_VAR_SET([gl_next_header],

              ['"'`(eval "$ac_cpp conftest.$ac_ext") 2>&AS_MESSAGE_LOG_FD |

               sed -n '\#/]m4_quote(m4_defn([gl_HEADER_NAME]))[#{

                 s#.*"\(.*/]m4_quote(m4_defn([gl_HEADER_NAME]))[\)".*#\1#

                 s#^/[^/]#//&#

                 p

                 q

               }'`'"'])

          else

            AS_VAR_SET([gl_next_header], ['<'gl_HEADER_NAME'>'])

          fi

          AS_VAR_POPDEF([gl_header_exists])])

     fi

     AC_SUBST(

       AS_TR_CPP([NEXT_]m4_quote(m4_defn([gl_HEADER_NAME]))),

       [AS_VAR_GET([gl_next_header])])

     AS_VAR_POPDEF([gl_next_header])])

])