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relocatable-prog: Update documentation. * doc/relocatable-maint.texi (Supporting Relocation): Update to match the recent changes.
author Bruno Haible <bruno@clisp.org>
date Sun, 24 Feb 2019 01:49:15 +0100
parents b06060465f09
children
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1 # timer_time.m4 serial 3
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2 dnl Copyright (C) 2011-2019 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 # Check for timer_settime, and set LIB_TIMER_TIME.
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8
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9 AC_DEFUN([gl_TIMER_TIME],
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10 [
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11 dnl Based on clock_time.m4. See details there.
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12
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13 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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14
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15 dnl Test whether the gnulib module 'threadlib' is in use.
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16 dnl Some packages like Emacs use --avoid=threadlib.
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17 dnl Write the symbol in such a way that it does not cause 'aclocal' to pick
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18 dnl the threadlib.m4 file that is installed in $PREFIX/share/aclocal/.
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19 m4_ifdef([gl_][THREADLIB], [AC_REQUIRE([gl_][THREADLIB])])
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20
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21 LIB_TIMER_TIME=
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22 AC_SUBST([LIB_TIMER_TIME])
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23 gl_saved_libs=$LIBS
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24 AC_SEARCH_LIBS([timer_settime], [rt posix4],
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25 [test "$ac_cv_search_timer_settime" = "none required" ||
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26 LIB_TIMER_TIME=$ac_cv_search_timer_settime])
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27 m4_ifdef([gl_][THREADLIB],
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28 [dnl GLIBC uses threads to emulate posix timers when kernel support
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29 dnl is not available (like Linux < 2.6 or when used with kFreeBSD)
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30 dnl Now the pthread lib is linked automatically in the normal case,
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31 dnl but when linking statically, it needs to be explicitly specified.
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32 AC_EGREP_CPP([Thread],
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33 [#include <features.h>
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34 #ifdef __GNU_LIBRARY__
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35 #if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 2) || (__GLIBC__ > 2)) \
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36 && !(__UCLIBC__ && __HAS_NO_THREADS__)
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37 Thread emulation available
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38 #endif
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39 #endif
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40 ],
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41 [LIB_TIMER_TIME="$LIB_TIMER_TIME $LIBMULTITHREAD"])])
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42 AC_CHECK_FUNCS([timer_settime])
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43 LIBS=$gl_saved_libs
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44 ])