diff options
Diffstat (limited to 'gnulib-m4/include_next.m4')
| -rw-r--r-- | gnulib-m4/include_next.m4 | 120 |
1 files changed, 42 insertions, 78 deletions
diff --git a/gnulib-m4/include_next.m4 b/gnulib-m4/include_next.m4 index 233d254..c7e0672 100644 --- a/gnulib-m4/include_next.m4 +++ b/gnulib-m4/include_next.m4 @@ -1,5 +1,5 @@ -# include_next.m4 serial 23 -dnl Copyright (C) 2006-2015 Free Software Foundation, Inc. +# include_next.m4 serial 14 +dnl Copyright (C) 2006-2010 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. @@ -24,13 +24,6 @@ dnl does not warn about some things, and on some systems (Solaris and Interix) dnl __STDC__ evaluates to 0 instead of to 1. The latter is an undesired side dnl effect; we are therefore careful to use 'defined __STDC__' or '1' instead dnl of plain '__STDC__'. -dnl -dnl PRAGMA_COLUMNS can be used in files that override system header files, so -dnl as to avoid compilation errors on HP NonStop systems when the gnulib file -dnl is included by a system header file that does a "#pragma COLUMNS 80" (which -dnl has the effect of truncating the lines of that file and all files that it -dnl includes to 80 columns) and the gnulib file has lines longer than 80 -dnl columns. AC_DEFUN([gl_INCLUDE_NEXT], [ @@ -75,11 +68,10 @@ EOF EOF gl_save_CPPFLAGS="$CPPFLAGS" CPPFLAGS="$gl_save_CPPFLAGS -Iconftestd1b -Iconftestd2" -dnl We intentionally avoid using AC_LANG_SOURCE here. - AC_COMPILE_IFELSE([AC_LANG_DEFINES_PROVIDED[#include <conftest.h>]], + AC_COMPILE_IFELSE([#include <conftest.h>], [gl_cv_have_include_next=yes], [CPPFLAGS="$gl_save_CPPFLAGS -Iconftestd1a -Iconftestd2" - AC_COMPILE_IFELSE([AC_LANG_DEFINES_PROVIDED[#include <conftest.h>]], + AC_COMPILE_IFELSE([#include <conftest.h>], [gl_cv_have_include_next=buggy], [gl_cv_have_include_next=no]) ]) @@ -105,24 +97,6 @@ dnl We intentionally avoid using AC_LANG_SOURCE here. AC_SUBST([INCLUDE_NEXT]) AC_SUBST([INCLUDE_NEXT_AS_FIRST_DIRECTIVE]) AC_SUBST([PRAGMA_SYSTEM_HEADER]) - AC_CACHE_CHECK([whether system header files limit the line length], - [gl_cv_pragma_columns], - [dnl HP NonStop systems, which define __TANDEM, have this misfeature. - AC_EGREP_CPP([choke me], - [ -#ifdef __TANDEM -choke me -#endif - ], - [gl_cv_pragma_columns=yes], - [gl_cv_pragma_columns=no]) - ]) - if test $gl_cv_pragma_columns = yes; then - PRAGMA_COLUMNS="#pragma COLUMNS 10000" - else - PRAGMA_COLUMNS= - fi - AC_SUBST([PRAGMA_COLUMNS]) ]) # gl_CHECK_NEXT_HEADERS(HEADER1 HEADER2 ...) @@ -143,81 +117,71 @@ choke me # 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. -# -# This macro also checks whether each header exists, by invoking -# AC_CHECK_HEADERS_ONCE or AC_CHECK_HEADERS on each argument. AC_DEFUN([gl_CHECK_NEXT_HEADERS], [ - gl_NEXT_HEADERS_INTERNAL([$1], [check]) -]) - -# gl_NEXT_HEADERS(HEADER1 HEADER2 ...) -# ------------------------------------ -# Like gl_CHECK_NEXT_HEADERS, except do not check whether the headers exist. -# This is suitable for headers like <stddef.h> that are standardized by C89 -# and therefore can be assumed to exist. -AC_DEFUN([gl_NEXT_HEADERS], -[ - gl_NEXT_HEADERS_INTERNAL([$1], [assume]) -]) - -# The guts of gl_CHECK_NEXT_HEADERS and gl_NEXT_HEADERS. -AC_DEFUN([gl_NEXT_HEADERS_INTERNAL], -[ AC_REQUIRE([gl_INCLUDE_NEXT]) AC_REQUIRE([AC_CANONICAL_HOST]) + AC_CHECK_HEADERS_ONCE([$1]) - m4_if([$2], [check], - [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])[>], m4_defn([gl_next_header]), - [m4_if([$2], [check], - [AS_VAR_PUSHDEF([gl_header_exists], - [ac_cv_header_]m4_defn([gl_HEADER_NAME])) - if test AS_VAR_GET(gl_header_exists) = yes; then - AS_VAR_POPDEF([gl_header_exists]) - ]) - gl_ABSOLUTE_HEADER_ONE(gl_HEADER_NAME) - AS_VAR_COPY([gl_header], [gl_cv_absolute_]AS_TR_SH(gl_HEADER_NAME)) - AS_VAR_SET(gl_next_header, ['"'$gl_header'"']) - m4_if([$2], [check], - [else - AS_VAR_SET(gl_next_header, ['<'gl_HEADER_NAME'>']) - fi - ]) - ]) + [AS_VAR_PUSHDEF([gl_header_exists], + [ac_cv_header_]m4_defn([gl_HEADER_NAME])) + if test AS_VAR_GET(gl_header_exists) = yes; then + AC_LANG_CONFTEST( + [AC_LANG_SOURCE( + [[#include <]]m4_dquote(m4_defn([gl_HEADER_NAME]))[[>]] + )]) + dnl AIX "xlc -E" and "cc -E" omit #line directives for header files + dnl that contain only a #include of other header files and no + dnl non-comment tokens of their own. This leads to a failure to + dnl detect the absolute name of <dirent.h>, <signal.h>, <poll.h> + dnl and others. The workaround is to force preservation of comments + dnl through option -C. This ensures all necessary #line directives + dnl are present. GCC supports option -C as well. + case "$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 + }'`'"']) + 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_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 $gl_cv_have_include_next = buggy; then # INCLUDE_NEXT_AS_FIRST_DIRECTIVE='include_next' gl_next_as_first_directive='<'gl_HEADER_NAME'>' else # INCLUDE_NEXT_AS_FIRST_DIRECTIVE='include' - gl_next_as_first_directive=AS_VAR_GET(gl_next_header) + gl_next_as_first_directive=AS_VAR_GET([gl_next_header]) fi AC_SUBST( AS_TR_CPP([NEXT_AS_FIRST_DIRECTIVE_]m4_defn([gl_HEADER_NAME])), [$gl_next_as_first_directive]) AS_VAR_POPDEF([gl_next_header])]) ]) - -# Autoconf 2.68 added warnings for our use of AC_COMPILE_IFELSE; -# this fallback is safe for all earlier autoconf versions. -m4_define_default([AC_LANG_DEFINES_PROVIDED]) |