Mercurial > gnulib
view m4/sys_ioctl_h.m4 @ 17364:7524d97ae56f
stdalign: port to stricter ISO C11
ISO C11 says that _Alignof's operand must be a parenthesized type.
Problem reported by Eli Zaretskii in
<http://lists.gnu.org/archive/html/emacs-devel/2013-03/msg00960.html>.
* doc/posix-headers/stdalign.texi (stdalign.h): Document this.
* m4/stdalign.m4 (gl_STDALIGN_H): Don't use _Alignof (expr).
author | Paul Eggert <eggert@cs.ucla.edu> |
---|---|
date | Fri, 29 Mar 2013 19:47:13 -0700 |
parents | e542fd46ad6f |
children | 344018b6e5d7 |
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# sys_ioctl_h.m4 serial 10 dnl Copyright (C) 2008-2013 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 Written by Bruno Haible. AC_DEFUN([gl_SYS_IOCTL_H], [ dnl Use AC_REQUIRE here, so that the default behavior below is expanded dnl once only, before all statements that occur in other macros. AC_REQUIRE([gl_SYS_IOCTL_H_DEFAULTS]) AC_CHECK_HEADERS_ONCE([sys/ioctl.h]) if test $ac_cv_header_sys_ioctl_h = yes; then HAVE_SYS_IOCTL_H=1 dnl Test whether <sys/ioctl.h> declares ioctl(), or whether some other dnl header file, such as <unistd.h> or <stropts.h>, is needed for that. AC_CACHE_CHECK([whether <sys/ioctl.h> declares ioctl], [gl_cv_decl_ioctl_in_sys_ioctl_h], [dnl We cannot use AC_CHECK_DECL because it produces its own messages. AC_COMPILE_IFELSE( [AC_LANG_PROGRAM( [AC_INCLUDES_DEFAULT([#include <sys/ioctl.h>])], [(void) ioctl;])], [gl_cv_decl_ioctl_in_sys_ioctl_h=yes], [gl_cv_decl_ioctl_in_sys_ioctl_h=no]) ]) else HAVE_SYS_IOCTL_H=0 fi AC_SUBST([HAVE_SYS_IOCTL_H]) dnl <sys/ioctl.h> is always overridden, because of GNULIB_POSIXCHECK. gl_CHECK_NEXT_HEADERS([sys/ioctl.h]) dnl Check for declarations of anything we want to poison if the dnl corresponding gnulib module is not in use. gl_WARN_ON_USE_PREPARE([[#include <sys/ioctl.h> /* Some platforms declare ioctl in the wrong header. */ #if !(defined __GLIBC__ && !defined __UCLIBC__) # include <unistd.h> #endif ]], [ioctl]) ]) AC_DEFUN([gl_SYS_IOCTL_MODULE_INDICATOR], [ dnl Use AC_REQUIRE here, so that the default settings are expanded once only. AC_REQUIRE([gl_SYS_IOCTL_H_DEFAULTS]) gl_MODULE_INDICATOR_SET_VARIABLE([$1]) dnl Define it also as a C macro, for the benefit of the unit tests. gl_MODULE_INDICATOR_FOR_TESTS([$1]) ]) AC_DEFUN([gl_SYS_IOCTL_H_DEFAULTS], [ GNULIB_IOCTL=0; AC_SUBST([GNULIB_IOCTL]) dnl Assume proper GNU behavior unless another module says otherwise. SYS_IOCTL_H_HAVE_WINSOCK2_H=0; AC_SUBST([SYS_IOCTL_H_HAVE_WINSOCK2_H]) SYS_IOCTL_H_HAVE_WINSOCK2_H_AND_USE_SOCKETS=0; AC_SUBST([SYS_IOCTL_H_HAVE_WINSOCK2_H_AND_USE_SOCKETS]) REPLACE_IOCTL=0; AC_SUBST([REPLACE_IOCTL]) ])