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annotate m4/signal_h.m4 @ 15857:6b8400199763

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New module 'sqrtf'. * lib/math.in.h (sqrtf): New declaration. * lib/sqrtf.c: New file. * m4/sqrtf.m4: New file. * m4/math_h.m4 (gl_MATH_H): Test whether sqrtf is declared. (gl_MATH_H_DEFAULTS): Initialize GNULIB_SQRTF, HAVE_SQRTF. * modules/math (Makefile.am): Substitute GNULIB_SQRTF, HAVE_SQRTF. * modules/sqrtf: New file. * tests/test-math-c++.cc: Check the declaration of sqrtf. * doc/posix-functions/sqrtf.texi: Mention the new module.
author Bruno Haible <bruno@clisp.org>
date Sat, 08 Oct 2011 21:16:48 +0200
parents 68596f3bad3e
children 8250f2777afc
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1 # signal_h.m4 serial 18
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2 dnl Copyright (C) 2007-2011 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 AC_DEFUN([gl_SIGNAL_H],
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8 [
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9 AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
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10 AC_REQUIRE([gl_CHECK_TYPE_SIGSET_T])
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11 gl_NEXT_HEADERS([signal.h])
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12
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13 # AIX declares sig_atomic_t to already include volatile, and C89 compilers
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14 # then choke on 'volatile sig_atomic_t'. C99 requires that it compile.
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15 AC_CHECK_TYPE([volatile sig_atomic_t], [],
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16 [HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=0], [[
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17 #include <signal.h>
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18 ]])
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19
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20 dnl Ensure the type pid_t gets defined.
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21 AC_REQUIRE([AC_TYPE_PID_T])
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22
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23 AC_REQUIRE([AC_TYPE_UID_T])
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24
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25 dnl Persuade glibc <signal.h> to define sighandler_t.
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26 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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27 AC_CHECK_TYPE([sighandler_t], [], [HAVE_SIGHANDLER_T=0], [[
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28 #include <signal.h>
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29 ]])
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30
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31 dnl Check for declarations of anything we want to poison if the
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32 dnl corresponding gnulib module is not in use.
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33 gl_WARN_ON_USE_PREPARE([[#include <signal.h>
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34 ]], [pthread_sigmask sigaction
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35 sigaddset sigdelset sigemptyset sigfillset sigismember
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36 sigpending sigprocmask])
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37 ])
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39 AC_DEFUN([gl_CHECK_TYPE_SIGSET_T],
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40 [
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41 AC_CHECK_TYPES([sigset_t],
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42 [gl_cv_type_sigset_t=yes], [gl_cv_type_sigset_t=no],
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43 [[
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44 #include <signal.h>
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45 /* Mingw defines sigset_t not in <signal.h>, but in <sys/types.h>. */
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46 #include <sys/types.h>
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47 ]])
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48 if test $gl_cv_type_sigset_t != yes; then
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49 HAVE_SIGSET_T=0
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50 fi
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51 ])
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52
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53 AC_DEFUN([gl_SIGNAL_MODULE_INDICATOR],
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54 [
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55 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
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56 AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
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57 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
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58 dnl Define it also as a C macro, for the benefit of the unit tests.
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59 gl_MODULE_INDICATOR_FOR_TESTS([$1])
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60 ])
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61
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62 AC_DEFUN([gl_SIGNAL_H_DEFAULTS],
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63 [
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64 GNULIB_PTHREAD_SIGMASK=0; AC_SUBST([GNULIB_PTHREAD_SIGMASK])
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65 GNULIB_RAISE=0; AC_SUBST([GNULIB_RAISE])
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66 GNULIB_SIGNAL_H_SIGPIPE=0; AC_SUBST([GNULIB_SIGNAL_H_SIGPIPE])
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67 GNULIB_SIGPROCMASK=0; AC_SUBST([GNULIB_SIGPROCMASK])
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68 GNULIB_SIGACTION=0; AC_SUBST([GNULIB_SIGACTION])
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69 dnl Assume proper GNU behavior unless another module says otherwise.
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70 HAVE_POSIX_SIGNALBLOCKING=1; AC_SUBST([HAVE_POSIX_SIGNALBLOCKING])
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71 HAVE_PTHREAD_SIGMASK=1; AC_SUBST([HAVE_PTHREAD_SIGMASK])
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72 HAVE_RAISE=1; AC_SUBST([HAVE_RAISE])
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73 HAVE_SIGSET_T=1; AC_SUBST([HAVE_SIGSET_T])
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74 HAVE_SIGINFO_T=1; AC_SUBST([HAVE_SIGINFO_T])
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75 HAVE_SIGACTION=1; AC_SUBST([HAVE_SIGACTION])
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76 HAVE_STRUCT_SIGACTION_SA_SIGACTION=1;
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77 AC_SUBST([HAVE_STRUCT_SIGACTION_SA_SIGACTION])
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78 HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=1;
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79 AC_SUBST([HAVE_TYPE_VOLATILE_SIG_ATOMIC_T])
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80 HAVE_SIGHANDLER_T=1; AC_SUBST([HAVE_SIGHANDLER_T])
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81 REPLACE_PTHREAD_SIGMASK=0; AC_SUBST([REPLACE_PTHREAD_SIGMASK])
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82 REPLACE_RAISE=0; AC_SUBST([REPLACE_RAISE])
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83 ])