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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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# duplocale.m4 serial 7
dnl Copyright (C) 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.

AC_DEFUN([gl_FUNC_DUPLOCALE],
[
  AC_REQUIRE([gl_LOCALE_H_DEFAULTS])
  AC_REQUIRE([AC_CANONICAL_HOST])
  AC_CHECK_FUNCS_ONCE([duplocale])
  if test $ac_cv_func_duplocale = yes; then
    dnl Check against glibc bug where duplocale crashes.
    dnl See <http://sourceware.org/bugzilla/show_bug.cgi?id=10969>.
    dnl Also, on AIX 7.1, duplocale(LC_GLOBAL_LOCALE) returns (locale_t)0 with
    dnl errno set to EINVAL.
    AC_REQUIRE([gl_LOCALE_H])
    AC_CACHE_CHECK([whether duplocale(LC_GLOBAL_LOCALE) works],
      [gl_cv_func_duplocale_works],
      [AC_RUN_IFELSE(
         [AC_LANG_SOURCE([[
#include <locale.h>
#if HAVE_XLOCALE_H
# include <xlocale.h>
#endif
int main ()
{
  if (duplocale (LC_GLOBAL_LOCALE) == (locale_t)0)
    return 1;
  return 0;
}]])],
         [gl_cv_func_duplocale_works=yes],
         [gl_cv_func_duplocale_works=no],
         [dnl Guess it works except on glibc < 2.12, uClibc, and AIX.
          case "$host_os" in
            aix*) gl_cv_func_duplocale_works="guessing no";;
            *-gnu*)
              AC_EGREP_CPP([Unlucky], [
#include <features.h>
#ifdef __GNU_LIBRARY__
 #if (__GLIBC__ == 2 && __GLIBC_MINOR__ < 12)
  Unlucky GNU user
 #endif
#endif
#ifdef __UCLIBC__
 Unlucky user
#endif
                ],
                [gl_cv_func_duplocale_works="guessing no"],
                [gl_cv_func_duplocale_works="guessing yes"])
              ;;
            *) gl_cv_func_duplocale_works="guessing yes";;
          esac
         ])
      ])
    case "$gl_cv_func_duplocale_works" in
      *no) REPLACE_DUPLOCALE=1 ;;
    esac
  else
    HAVE_DUPLOCALE=0
  fi
])

# Prerequisites of lib/duplocale.c.
AC_DEFUN([gl_PREREQ_DUPLOCALE],
[
  :
])