Update gnulib files.

5 files changed, 102 insertions, 12 deletions

diff --git a/gl/m4/frexpl.m4 b/gl/m4/frexpl.m4
index 8e71420a30..9df87ab82f 100644
--- a/gl/m4/frexpl.m4
+++ b/gl/m4/frexpl.m4
@@ -1,4 +1,4 @@
-# frexpl.m4 serial 18
+# frexpl.m4 serial 19
 dnl Copyright (C) 2007-2012 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -8,9 +8,14 @@ AC_DEFUN([gl_FUNC_FREXPL],
 [
   AC_REQUIRE([gl_MATH_H_DEFAULTS])
   AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
+
+  dnl Persuade glibc <math.h> to declare frexpl().
+  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
   dnl Check whether it's declared.
   dnl MacOS X 10.3 has frexpl() in libc but doesn't declare it in <math.h>.
   AC_CHECK_DECL([frexpl], , [HAVE_DECL_FREXPL=0], [[#include <math.h>]])
+
   FREXPL_LIBM=
   if test $HAVE_DECL_FREXPL = 1; then
     gl_CHECK_FREXPL_NO_LIBM
diff --git a/gl/m4/gnulib-comp.m4 b/gl/m4/gnulib-comp.m4
index db4b7893e8..461d7e5bab 100644
--- a/gl/m4/gnulib-comp.m4
+++ b/gl/m4/gnulib-comp.m4
@@ -38,6 +38,7 @@ AC_DEFUN([gl_EARLY],
   m4_pattern_allow([^gl_LIBOBJS$])dnl a variable
   m4_pattern_allow([^gl_LTLIBOBJS$])dnl a variable
   AC_REQUIRE([gl_PROG_AR_RANLIB])
+  AC_REQUIRE([AM_PROG_CC_C_O])
   # Code from module accept:
   # Code from module accept-tests:
   # Code from module alloca:
@@ -807,6 +808,7 @@ AC_PROG_MKDIR_P
 gl_HEADER_SYS_UIO
 AC_PROG_MKDIR_P
 gl_SYSEXITS
+gl_THREADLIB
 gl_HEADER_TIME_H
 gl_TIME_R
 if test $HAVE_LOCALTIME_R = 0 || test $REPLACE_LOCALTIME_R = 1; then
@@ -1004,7 +1006,6 @@ gl_UNISTD_MODULE_INDICATOR([symlink])
 gl_SYS_IOCTL_H
 AC_PROG_MKDIR_P
 AC_CHECK_FUNCS_ONCE([shutdown])
-gl_THREADLIB
 gl_FUNC_UNSETENV
 if test $HAVE_UNSETENV = 0 || test $REPLACE_UNSETENV = 1; then
   AC_LIBOBJ([unsetenv])
@@ -1186,6 +1187,7 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/gettext.h
   lib/gettime.c
   lib/gettimeofday.c
+  lib/glthread/threadlib.c
   lib/inet_ntop.c
   lib/inet_pton.c
   lib/intprops.h
@@ -1480,6 +1482,8 @@ AC_DEFUN([gl_FILE_LIST], [
   tests/macros.h
   tests/minus-zero.h
   tests/nan.h
+  tests/randomd.c
+  tests/randoml.c
   tests/signature.h
   tests/test-accept.c
   tests/test-alloca-opt.c
@@ -1506,6 +1510,7 @@ AC_DEFUN([gl_FILE_LIST], [
   tests/test-fputc.c
   tests/test-fread.c
   tests/test-frexp.c
+  tests/test-frexp.h
   tests/test-frexpl.c
   tests/test-fseek.c
   tests/test-fseek.sh
@@ -1649,7 +1654,6 @@ AC_DEFUN([gl_FILE_LIST], [
   tests=lib/getpagesize.c
   tests=lib/glthread/lock.c
   tests=lib/glthread/lock.h
-  tests=lib/glthread/threadlib.c
   tests=lib/ignore-value.h
   tests=lib/inttypes.in.h
   tests=lib/ioctl.c
diff --git a/gl/m4/ldexpl.m4 b/gl/m4/ldexpl.m4
index 9c9ec6705e..11f20ca2a8 100644
--- a/gl/m4/ldexpl.m4
+++ b/gl/m4/ldexpl.m4
@@ -1,4 +1,4 @@
-# ldexpl.m4 serial 14
+# ldexpl.m4 serial 15
 dnl Copyright (C) 2007-2012 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -9,9 +9,14 @@ AC_DEFUN([gl_FUNC_LDEXPL],
   AC_REQUIRE([gl_MATH_H_DEFAULTS])
   AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
   AC_REQUIRE([gl_FUNC_ISNANL]) dnl for ISNANL_LIBM
+
+  dnl Persuade glibc <math.h> to declare ldexpl().
+  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
   dnl Check whether it's declared.
   dnl MacOS X 10.3 has ldexpl() in libc but doesn't declare it in <math.h>.
   AC_CHECK_DECL([ldexpl], , [HAVE_DECL_LDEXPL=0], [[#include <math.h>]])
+
   LDEXPL_LIBM=
   if test $HAVE_DECL_LDEXPL = 1; then
     gl_CHECK_LDEXPL_NO_LIBM
diff --git a/gl/m4/math_h.m4 b/gl/m4/math_h.m4
index 6f9389dc18..ff1654ec7f 100644
--- a/gl/m4/math_h.m4
+++ b/gl/m4/math_h.m4
@@ -1,4 +1,4 @@
-# math_h.m4 serial 71
+# math_h.m4 serial 104
 dnl Copyright (C) 2007-2012 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -40,10 +40,13 @@ AC_DEFUN([gl_MATH_H],
   dnl corresponding gnulib module is not in use.
   gl_WARN_ON_USE_PREPARE([[#include <math.h>]],
     [acosf acosl asinf asinl atanf atanl
-     ceilf ceill copysign copysignf copysignl cosf cosl coshf
-     expf expl fabsf fabsl floorf floorl fma fmaf fmal
-     fmod fmodf fmodl frexpf frexpl
-     ldexpf ldexpl logb logf logl log10f log10l modf modff modfl powf
+     cbrt cbrtf cbrtl ceilf ceill copysign copysignf copysignl cosf cosl coshf
+     expf expl exp2 exp2f exp2l expm1 expm1f expm1l
+     fabsf fabsl floorf floorl fma fmaf fmal
+     fmod fmodf fmodl frexpf frexpl hypotf hypotl
+     ldexpf ldexpl
+     logb log logf logl log10f log10l log1p log1pf log1pl log2 log2f log2l
+     modf modff modfl powf
      remainder remainderf remainderl
      rint rintf rintl round roundf roundl sinf sinl sinhf sqrtf sqrtl
      tanf tanl tanhf trunc truncf truncl])
@@ -67,6 +70,9 @@ AC_DEFUN([gl_MATH_H_DEFAULTS],
   GNULIB_ATANF=0;      AC_SUBST([GNULIB_ATANF])
   GNULIB_ATANL=0;      AC_SUBST([GNULIB_ATANL])
   GNULIB_ATAN2F=0;     AC_SUBST([GNULIB_ATAN2F])
+  GNULIB_CBRT=0;       AC_SUBST([GNULIB_CBRT])
+  GNULIB_CBRTF=0;      AC_SUBST([GNULIB_CBRTF])
+  GNULIB_CBRTL=0;      AC_SUBST([GNULIB_CBRTL])
   GNULIB_CEIL=0;       AC_SUBST([GNULIB_CEIL])
   GNULIB_CEILF=0;      AC_SUBST([GNULIB_CEILF])
   GNULIB_CEILL=0;      AC_SUBST([GNULIB_CEILL])
@@ -78,6 +84,12 @@ AC_DEFUN([gl_MATH_H_DEFAULTS],
   GNULIB_COSHF=0;      AC_SUBST([GNULIB_COSHF])
   GNULIB_EXPF=0;       AC_SUBST([GNULIB_EXPF])
   GNULIB_EXPL=0;       AC_SUBST([GNULIB_EXPL])
+  GNULIB_EXP2=0;       AC_SUBST([GNULIB_EXP2])
+  GNULIB_EXP2F=0;      AC_SUBST([GNULIB_EXP2F])
+  GNULIB_EXP2L=0;      AC_SUBST([GNULIB_EXP2L])
+  GNULIB_EXPM1=0;      AC_SUBST([GNULIB_EXPM1])
+  GNULIB_EXPM1F=0;     AC_SUBST([GNULIB_EXPM1F])
+  GNULIB_EXPM1L=0;     AC_SUBST([GNULIB_EXPM1L])
   GNULIB_FABSF=0;      AC_SUBST([GNULIB_FABSF])
   GNULIB_FABSL=0;      AC_SUBST([GNULIB_FABSL])
   GNULIB_FLOOR=0;      AC_SUBST([GNULIB_FLOOR])
@@ -92,6 +104,9 @@ AC_DEFUN([gl_MATH_H_DEFAULTS],
   GNULIB_FREXPF=0;     AC_SUBST([GNULIB_FREXPF])
   GNULIB_FREXP=0;      AC_SUBST([GNULIB_FREXP])
   GNULIB_FREXPL=0;     AC_SUBST([GNULIB_FREXPL])
+  GNULIB_HYPOT=0;      AC_SUBST([GNULIB_HYPOT])
+  GNULIB_HYPOTF=0;     AC_SUBST([GNULIB_HYPOTF])
+  GNULIB_HYPOTL=0;     AC_SUBST([GNULIB_HYPOTL])
   GNULIB_ISFINITE=0;   AC_SUBST([GNULIB_ISFINITE])
   GNULIB_ISINF=0;      AC_SUBST([GNULIB_ISINF])
   GNULIB_ISNAN=0;      AC_SUBST([GNULIB_ISNAN])
@@ -101,10 +116,17 @@ AC_DEFUN([gl_MATH_H_DEFAULTS],
   GNULIB_LDEXPF=0;     AC_SUBST([GNULIB_LDEXPF])
   GNULIB_LDEXPL=0;     AC_SUBST([GNULIB_LDEXPL])
   GNULIB_LOGB=0;       AC_SUBST([GNULIB_LOGB])
+  GNULIB_LOG=0;        AC_SUBST([GNULIB_LOG])
   GNULIB_LOGF=0;       AC_SUBST([GNULIB_LOGF])
   GNULIB_LOGL=0;       AC_SUBST([GNULIB_LOGL])
   GNULIB_LOG10F=0;     AC_SUBST([GNULIB_LOG10F])
   GNULIB_LOG10L=0;     AC_SUBST([GNULIB_LOG10L])
+  GNULIB_LOG1P=0;      AC_SUBST([GNULIB_LOG1P])
+  GNULIB_LOG1PF=0;     AC_SUBST([GNULIB_LOG1PF])
+  GNULIB_LOG1PL=0;     AC_SUBST([GNULIB_LOG1PL])
+  GNULIB_LOG2=0;       AC_SUBST([GNULIB_LOG2])
+  GNULIB_LOG2F=0;      AC_SUBST([GNULIB_LOG2F])
+  GNULIB_LOG2L=0;      AC_SUBST([GNULIB_LOG2L])
   GNULIB_MODF=0;       AC_SUBST([GNULIB_MODF])
   GNULIB_MODFF=0;      AC_SUBST([GNULIB_MODFF])
   GNULIB_MODFL=0;      AC_SUBST([GNULIB_MODFL])
@@ -138,14 +160,18 @@ AC_DEFUN([gl_MATH_H_DEFAULTS],
   HAVE_ATANF=1;                AC_SUBST([HAVE_ATANF])
   HAVE_ATANL=1;                AC_SUBST([HAVE_ATANL])
   HAVE_ATAN2F=1;               AC_SUBST([HAVE_ATAN2F])
+  HAVE_CBRT=1;                 AC_SUBST([HAVE_CBRT])
+  HAVE_CBRTF=1;                AC_SUBST([HAVE_CBRTF])
+  HAVE_CBRTL=1;                AC_SUBST([HAVE_CBRTL])
   HAVE_COPYSIGN=1;             AC_SUBST([HAVE_COPYSIGN])
-  HAVE_COPYSIGNF=1;            AC_SUBST([HAVE_COPYSIGNF])
   HAVE_COPYSIGNL=1;            AC_SUBST([HAVE_COPYSIGNL])
   HAVE_COSF=1;                 AC_SUBST([HAVE_COSF])
   HAVE_COSL=1;                 AC_SUBST([HAVE_COSL])
   HAVE_COSHF=1;                AC_SUBST([HAVE_COSHF])
   HAVE_EXPF=1;                 AC_SUBST([HAVE_EXPF])
   HAVE_EXPL=1;                 AC_SUBST([HAVE_EXPL])
+  HAVE_EXPM1=1;                AC_SUBST([HAVE_EXPM1])
+  HAVE_EXPM1F=1;               AC_SUBST([HAVE_EXPM1F])
   HAVE_FABSF=1;                AC_SUBST([HAVE_FABSF])
   HAVE_FABSL=1;                AC_SUBST([HAVE_FABSL])
   HAVE_FMA=1;                  AC_SUBST([HAVE_FMA])
@@ -154,6 +180,8 @@ AC_DEFUN([gl_MATH_H_DEFAULTS],
   HAVE_FMODF=1;                AC_SUBST([HAVE_FMODF])
   HAVE_FMODL=1;                AC_SUBST([HAVE_FMODL])
   HAVE_FREXPF=1;               AC_SUBST([HAVE_FREXPF])
+  HAVE_HYPOTF=1;               AC_SUBST([HAVE_HYPOTF])
+  HAVE_HYPOTL=1;               AC_SUBST([HAVE_HYPOTL])
   HAVE_ISNANF=1;               AC_SUBST([HAVE_ISNANF])
   HAVE_ISNAND=1;               AC_SUBST([HAVE_ISNAND])
   HAVE_ISNANL=1;               AC_SUBST([HAVE_ISNANL])
@@ -162,14 +190,15 @@ AC_DEFUN([gl_MATH_H_DEFAULTS],
   HAVE_LOGL=1;                 AC_SUBST([HAVE_LOGL])
   HAVE_LOG10F=1;               AC_SUBST([HAVE_LOG10F])
   HAVE_LOG10L=1;               AC_SUBST([HAVE_LOG10L])
+  HAVE_LOG1P=1;                AC_SUBST([HAVE_LOG1P])
+  HAVE_LOG1PF=1;               AC_SUBST([HAVE_LOG1PF])
+  HAVE_LOG1PL=1;               AC_SUBST([HAVE_LOG1PL])
   HAVE_MODFF=1;                AC_SUBST([HAVE_MODFF])
   HAVE_MODFL=1;                AC_SUBST([HAVE_MODFL])
   HAVE_POWF=1;                 AC_SUBST([HAVE_POWF])
   HAVE_REMAINDER=1;            AC_SUBST([HAVE_REMAINDER])
   HAVE_REMAINDERF=1;           AC_SUBST([HAVE_REMAINDERF])
-  HAVE_REMAINDERL=1;           AC_SUBST([HAVE_REMAINDERL])
   HAVE_RINT=1;                 AC_SUBST([HAVE_RINT])
-  HAVE_RINTF=1;                AC_SUBST([HAVE_RINTF])
   HAVE_RINTL=1;                AC_SUBST([HAVE_RINTL])
   HAVE_SINF=1;                 AC_SUBST([HAVE_SINF])
   HAVE_SINL=1;                 AC_SUBST([HAVE_SINL])
@@ -182,10 +211,17 @@ AC_DEFUN([gl_MATH_H_DEFAULTS],
   HAVE_DECL_ACOSL=1;           AC_SUBST([HAVE_DECL_ACOSL])
   HAVE_DECL_ASINL=1;           AC_SUBST([HAVE_DECL_ASINL])
   HAVE_DECL_ATANL=1;           AC_SUBST([HAVE_DECL_ATANL])
+  HAVE_DECL_CBRTF=1;           AC_SUBST([HAVE_DECL_CBRTF])
+  HAVE_DECL_CBRTL=1;           AC_SUBST([HAVE_DECL_CBRTL])
   HAVE_DECL_CEILF=1;           AC_SUBST([HAVE_DECL_CEILF])
   HAVE_DECL_CEILL=1;           AC_SUBST([HAVE_DECL_CEILL])
+  HAVE_DECL_COPYSIGNF=1;       AC_SUBST([HAVE_DECL_COPYSIGNF])
   HAVE_DECL_COSL=1;            AC_SUBST([HAVE_DECL_COSL])
   HAVE_DECL_EXPL=1;            AC_SUBST([HAVE_DECL_EXPL])
+  HAVE_DECL_EXP2=1;            AC_SUBST([HAVE_DECL_EXP2])
+  HAVE_DECL_EXP2F=1;           AC_SUBST([HAVE_DECL_EXP2F])
+  HAVE_DECL_EXP2L=1;           AC_SUBST([HAVE_DECL_EXP2L])
+  HAVE_DECL_EXPM1L=1;          AC_SUBST([HAVE_DECL_EXPM1L])
   HAVE_DECL_FLOORF=1;          AC_SUBST([HAVE_DECL_FLOORF])
   HAVE_DECL_FLOORL=1;          AC_SUBST([HAVE_DECL_FLOORL])
   HAVE_DECL_FREXPL=1;          AC_SUBST([HAVE_DECL_FREXPL])
@@ -193,7 +229,12 @@ AC_DEFUN([gl_MATH_H_DEFAULTS],
   HAVE_DECL_LOGB=1;            AC_SUBST([HAVE_DECL_LOGB])
   HAVE_DECL_LOGL=1;            AC_SUBST([HAVE_DECL_LOGL])
   HAVE_DECL_LOG10L=1;          AC_SUBST([HAVE_DECL_LOG10L])
+  HAVE_DECL_LOG2=1;            AC_SUBST([HAVE_DECL_LOG2])
+  HAVE_DECL_LOG2F=1;           AC_SUBST([HAVE_DECL_LOG2F])
+  HAVE_DECL_LOG2L=1;           AC_SUBST([HAVE_DECL_LOG2L])
   HAVE_DECL_REMAINDER=1;       AC_SUBST([HAVE_DECL_REMAINDER])
+  HAVE_DECL_REMAINDERL=1;      AC_SUBST([HAVE_DECL_REMAINDERL])
+  HAVE_DECL_RINTF=1;           AC_SUBST([HAVE_DECL_RINTF])
   HAVE_DECL_ROUND=1;           AC_SUBST([HAVE_DECL_ROUND])
   HAVE_DECL_ROUNDF=1;          AC_SUBST([HAVE_DECL_ROUNDF])
   HAVE_DECL_ROUNDL=1;          AC_SUBST([HAVE_DECL_ROUNDL])
@@ -203,9 +244,15 @@ AC_DEFUN([gl_MATH_H_DEFAULTS],
   HAVE_DECL_TRUNC=1;           AC_SUBST([HAVE_DECL_TRUNC])
   HAVE_DECL_TRUNCF=1;          AC_SUBST([HAVE_DECL_TRUNCF])
   HAVE_DECL_TRUNCL=1;          AC_SUBST([HAVE_DECL_TRUNCL])
+  REPLACE_CBRTF=0;             AC_SUBST([REPLACE_CBRTF])
+  REPLACE_CBRTL=0;             AC_SUBST([REPLACE_CBRTL])
   REPLACE_CEIL=0;              AC_SUBST([REPLACE_CEIL])
   REPLACE_CEILF=0;             AC_SUBST([REPLACE_CEILF])
   REPLACE_CEILL=0;             AC_SUBST([REPLACE_CEILL])
+  REPLACE_EXPM1=0;             AC_SUBST([REPLACE_EXPM1])
+  REPLACE_EXPM1F=0;            AC_SUBST([REPLACE_EXPM1F])
+  REPLACE_EXP2=0;              AC_SUBST([REPLACE_EXP2])
+  REPLACE_EXP2L=0;             AC_SUBST([REPLACE_EXP2L])
   REPLACE_FABSL=0;             AC_SUBST([REPLACE_FABSL])
   REPLACE_FLOOR=0;             AC_SUBST([REPLACE_FLOOR])
   REPLACE_FLOORF=0;            AC_SUBST([REPLACE_FLOORF])
@@ -220,10 +267,22 @@ AC_DEFUN([gl_MATH_H_DEFAULTS],
   REPLACE_FREXP=0;             AC_SUBST([REPLACE_FREXP])
   REPLACE_FREXPL=0;            AC_SUBST([REPLACE_FREXPL])
   REPLACE_HUGE_VAL=0;          AC_SUBST([REPLACE_HUGE_VAL])
+  REPLACE_HYPOT=0;             AC_SUBST([REPLACE_HYPOT])
+  REPLACE_HYPOTF=0;            AC_SUBST([REPLACE_HYPOTF])
+  REPLACE_HYPOTL=0;            AC_SUBST([REPLACE_HYPOTL])
   REPLACE_ISFINITE=0;          AC_SUBST([REPLACE_ISFINITE])
   REPLACE_ISINF=0;             AC_SUBST([REPLACE_ISINF])
   REPLACE_ISNAN=0;             AC_SUBST([REPLACE_ISNAN])
   REPLACE_LDEXPL=0;            AC_SUBST([REPLACE_LDEXPL])
+  REPLACE_LOG=0;               AC_SUBST([REPLACE_LOG])
+  REPLACE_LOGF=0;              AC_SUBST([REPLACE_LOGF])
+  REPLACE_LOGL=0;              AC_SUBST([REPLACE_LOGL])
+  REPLACE_LOG1P=0;             AC_SUBST([REPLACE_LOG1P])
+  REPLACE_LOG1PF=0;            AC_SUBST([REPLACE_LOG1PF])
+  REPLACE_LOG1PL=0;            AC_SUBST([REPLACE_LOG1PL])
+  REPLACE_LOG2=0;              AC_SUBST([REPLACE_LOG2])
+  REPLACE_LOG2F=0;             AC_SUBST([REPLACE_LOG2F])
+  REPLACE_LOG2L=0;             AC_SUBST([REPLACE_LOG2L])
   REPLACE_MODF=0;              AC_SUBST([REPLACE_MODF])
   REPLACE_MODFF=0;             AC_SUBST([REPLACE_MODFF])
   REPLACE_MODFL=0;             AC_SUBST([REPLACE_MODFL])
@@ -236,6 +295,7 @@ AC_DEFUN([gl_MATH_H_DEFAULTS],
   REPLACE_ROUNDL=0;            AC_SUBST([REPLACE_ROUNDL])
   REPLACE_SIGNBIT=0;           AC_SUBST([REPLACE_SIGNBIT])
   REPLACE_SIGNBIT_USING_GCC=0; AC_SUBST([REPLACE_SIGNBIT_USING_GCC])
+  REPLACE_SQRTL=0;             AC_SUBST([REPLACE_SQRTL])
   REPLACE_TRUNC=0;             AC_SUBST([REPLACE_TRUNC])
   REPLACE_TRUNCF=0;            AC_SUBST([REPLACE_TRUNCF])
   REPLACE_TRUNCL=0;            AC_SUBST([REPLACE_TRUNCL])
diff --git a/gl/m4/timer_time.m4 b/gl/m4/timer_time.m4
index 6276759339..d6e0efeb61 100644
--- a/gl/m4/timer_time.m4
+++ b/gl/m4/timer_time.m4
@@ -11,6 +11,7 @@ AC_DEFUN([gl_TIMER_TIME],
   dnl Based on clock_time.m4. See details there.
 
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+  AC_REQUIRE([gl_THREADLIB])
 
   LIB_TIMER_TIME=
   AC_SUBST([LIB_TIMER_TIME])
@@ -18,6 +19,21 @@ AC_DEFUN([gl_TIMER_TIME],
     AC_SEARCH_LIBS([timer_settime], [rt posix4],
                    [test "$ac_cv_search_timer_settime" = "none required" ||
                     LIB_TIMER_TIME=$ac_cv_search_timer_settime])
+    dnl GLIBC uses threads to emulate posix timers when kernel support
+    dnl is not available (like Linux < 2.6 or when used with kFreeBSD)
+    dnl Now the pthread lib is linked automatically in the normal case,
+    dnl but when linking statically, it needs to be explicitly specified.
+    AC_EGREP_CPP([Thread],
+      [
+#include <features.h>
+#ifdef __GNU_LIBRARY__
+ #if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 2) || (__GLIBC__ > 2)) \
+     && !defined __UCLIBC__
+  Thread emulation available
+ #endif
+#endif
+      ],
+      [LIB_TIMER_TIME="$LIBMULTITHREAD $LIB_TIMER_TIME"])
     AC_CHECK_FUNCS([timer_settime])
   LIBS=$gl_saved_libs
 ])