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m4: fix gl_TIMER_TIME() detection of threads on uClibc The timer_time.m4 gl_TIMER_TIME function determines which libraries need to be linked to get access to the timer function, generally -lrt for Linux systems. On platforms where threads are used, librt typically uses thread functions from libpthread. However, the test to determine whether the platform has thread or not is incorrect: it assumes that if the C library is uClibc, then threads are not available. This is actually not true: uClibc has configurable thread support, and when thread support is available, librt calls libpthread functions. This is important when static linking is used, because otherwise only -lrt is used at link time, which fails because librt calls undefined thread functions. Both -lrt and -lpthread must be passed. This problem is fixed by making the uClibc thread detection a bit smarter, thanks to the usage of the __HAS_NO_THREADS__ macro defined in <bits/uClibc_config.h>, which itself is included by <features.h>. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Eric Blake <eblake@redhat.com>
author Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
date Sat, 22 Feb 2014 00:41:38 +0100
parents 344018b6e5d7
children
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# bison-i18n.m4 serial 3
dnl Copyright (C) 2005-2006, 2009-2014 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.

dnl From Bruno Haible.

dnl Support for internationalization of bison-generated parsers.

dnl BISON_I18N
dnl should be used in configure.ac, after AM_GNU_GETTEXT. If USE_NLS is yes, it
dnl sets BISON_LOCALEDIR to indicate where to find the bison-runtime.mo files
dnl and defines YYENABLE_NLS if there are bison-runtime.mo files at all.
AC_DEFUN([BISON_I18N],
[
  if test -z "$USE_NLS"; then
    echo "The BISON-I18N macro is used without being preceded by AM-GNU-GETTEXT." 1>&2
    exit 1
  fi
  BISON_LOCALEDIR=
  BISON_USE_NLS=no
  if test "$USE_NLS" = yes; then
    dnl Determine bison's localedir.
    dnl AC_PROG_YACC sets the YACC variable; other macros set the BISON variable.
    dnl But even is YACC is called "yacc", it may be a script that invokes bison
    dnl and accepts the --print-localedir option.
    dnl YACC's default value is empty; BISON's default value is :.
    if (${YACC-${BISON-:}} --print-localedir) >/dev/null 2>&1; then
      BISON_LOCALEDIR=`${YACC-${BISON-:}} --print-localedir`
    fi
    AC_SUBST([BISON_LOCALEDIR])
    if test -n "$BISON_LOCALEDIR"; then
      dnl There is no need to enable internationalization if the user doesn't
      dnl want message catalogs.  So look at the language/locale names for
      dnl which the user wants message catalogs.  This is $LINGUAS.  If unset
      dnl or empty, he wants all of them.
      USER_LINGUAS="${LINGUAS-%UNSET%}"
      if test -n "$USER_LINGUAS"; then
        BISON_USE_NLS=yes
      fi
    fi
  fi
  if test $BISON_USE_NLS = yes; then
    AC_DEFINE([YYENABLE_NLS], [1],
      [Define to 1 to internationalize bison runtime messages.])
  fi
])