-# include_next.m4 serial 18
-dnl Copyright (C) 2006-2011 Free Software Foundation, Inc.
+# include_next.m4 serial 23
+dnl Copyright (C) 2006-2014 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.
# 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.
+# 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_CHECK_HEADERS_ONCE([$1])
])
+dnl FIXME: gl_next_header and gl_header_exists must be used unquoted
+dnl until we can assume autoconf 2.64 or newer.
m4_foreach_w([gl_HEADER_NAME], [$1],
[AS_VAR_PUSHDEF([gl_next_header],
[gl_cv_next_]m4_defn([gl_HEADER_NAME]))
if test $gl_cv_have_include_next = yes; then
- AS_VAR_SET([gl_next_header], ['<'gl_HEADER_NAME'>'])
+ AS_VAR_SET(gl_next_header, ['<'gl_HEADER_NAME'>'])
else
AC_CACHE_CHECK(
[absolute name of <]m4_defn([gl_HEADER_NAME])[>],
if test AS_VAR_GET(gl_header_exists) = yes; then
AS_VAR_POPDEF([gl_header_exists])
])
- AC_LANG_CONFTEST(
- [AC_LANG_SOURCE(
- [[#include <]]m4_dquote(m4_defn([gl_HEADER_NAME]))[[>]]
- )])
- dnl AIX "xlc -E" and "cc -E" omit #line directives for header
- dnl files that contain only a #include of other header files and
- dnl no non-comment tokens of their own. This leads to a failure
- dnl to detect the absolute name of <dirent.h>, <signal.h>,
- dnl <poll.h> and others. The workaround is to force preservation
- dnl of comments through option -C. This ensures all necessary
- dnl #line directives are present. GCC supports option -C as well.
- case "$host_os" in
- aix*) gl_absname_cpp="$ac_cpp -C" ;;
- *) gl_absname_cpp="$ac_cpp" ;;
- esac
- dnl eval is necessary to expand gl_absname_cpp.
- dnl Ultrix and Pyramid sh refuse to redirect output of eval,
- dnl so use subshell.
- AS_VAR_SET([gl_next_header],
- ['"'`(eval "$gl_absname_cpp conftest.$ac_ext") 2>&AS_MESSAGE_LOG_FD |
- sed -n '\#/]m4_defn([gl_HEADER_NAME])[#{
- s#.*"\(.*/]m4_defn([gl_HEADER_NAME])[\)".*#\1#
- s#^/[^/]#//&#
- p
- q
- }'`'"'])
+ gl_ABSOLUTE_HEADER_ONE(gl_HEADER_NAME)
+ AS_VAR_COPY([gl_header], [gl_cv_absolute_]AS_TR_SH(gl_HEADER_NAME))
+ AS_VAR_SET(gl_next_header, ['"'$gl_header'"'])
m4_if([$2], [check],
[else
- AS_VAR_SET([gl_next_header], ['<'gl_HEADER_NAME'>'])
+ AS_VAR_SET(gl_next_header, ['<'gl_HEADER_NAME'>'])
fi
])
])
fi
AC_SUBST(
AS_TR_CPP([NEXT_]m4_defn([gl_HEADER_NAME])),
- [AS_VAR_GET([gl_next_header])])
+ [AS_VAR_GET(gl_next_header)])
if test $gl_cv_have_include_next = yes || test $gl_cv_have_include_next = buggy; then
# INCLUDE_NEXT_AS_FIRST_DIRECTIVE='include_next'
gl_next_as_first_directive='<'gl_HEADER_NAME'>'
else
# INCLUDE_NEXT_AS_FIRST_DIRECTIVE='include'
- gl_next_as_first_directive=AS_VAR_GET([gl_next_header])
+ gl_next_as_first_directive=AS_VAR_GET(gl_next_header)
fi
AC_SUBST(
AS_TR_CPP([NEXT_AS_FIRST_DIRECTIVE_]m4_defn([gl_HEADER_NAME])),