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annotate m4/signal_h.m4 @ 12766:2c14f1e449e5

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warn-on-use: use instead of link-warning Each *.in.h file serves two purposes - provide enough self-contained content to serve as a replacement for the system header regardless of the user's compiler, and offer the developer the ability to detect any gnulib modules that might have been inadvertantly excluded. The former requires independence from config.h, and routes everything through a Makefile.am snippet that uses @@ substitution specific to the modules that were in use, with details learned at configure time. The latter works by poisoning anything that gnulib did not replace, but which the developer had natively available, explaining why their tests passed during development. Poisoning relies on gcc features, and requires manual triggering by adding -DGNULIB_POSIXCHECK to CFLAGS; it assumes that <config.h> is properly included. In fact, we do not want to use @@ substitution for HAVE_DECL_* during poisoning, because the warning is only relevant for the gnulib modules which were not included, and thus where the m4 macros to set proper @@ values have not been run. Furthermore, we only need to poison interfaces that already have a declaration; if something is not declared, then the developer wouldn't have been able to link, so their code won't be using the problematic interface in the first place. * modules/stdio (Depends-on, Makefile.am): Drop link-warning. * modules/unistd (Depends-on, Makefile.am): Likewise. * modules/arpa_inet (Depends-on): Replace link-warning with warn-on-use. (Makefile.am): Update rules accordingly. * modules/ctype (Depends-on, Makefile.am): Likewise. * modules/dirent (Depends-on, Makefile.am): Likewise. * modules/fcntl-h (Depends-on, Makefile.am): Likewise. * modules/inttypes (Depends-on, Makefile.am): Likewise. * modules/langinfo (Depends-on, Makefile.am): Likewise. * modules/locale (Depends-on, Makefile.am): Likewise. * modules/math (Depends-on, Makefile.am): Likewise. * modules/search (Depends-on, Makefile.am): Likewise. * modules/signal (Depends-on, Makefile.am): Likewise. * modules/spawn (Depends-on, Makefile.am): Likewise. * modules/stdlib (Depends-on, Makefile.am): Likewise. * modules/string (Depends-on, Makefile.am): Likewise. * modules/strings (Depends-on, Makefile.am): Likewise. * modules/sys_file (Depends-on, Makefile.am): Likewise. * modules/sys_ioctl (Depends-on, Makefile.am): Likewise. * modules/sys_select (Depends-on, Makefile.am): Likewise. * modules/sys_socket (Depends-on, Makefile.am): Likewise. * modules/sys_stat (Depends-on, Makefile.am): Likewise. * modules/sys_times (Depends-on, Makefile.am): Likewise. * modules/sys_utsname (Depends-on, Makefile.am): Likewise. * modules/wchar (Depends-on, Makefile.am): Likewise. * m4/arpa_inet_h.m4 (gl_HEADER_ARPA_INET): Check which functions should be poisoned. * m4/ctype.m4 (gl_CTYPE_H): Likewise. * m4/dirent_h.m4 (gl_DIRENT_H): Likewise. * m4/fcntl_h.m4 (gl_FCNTL_H): Likewise. * m4/inttypes.m4 (gl_INTTYPES_H): Likewise. * m4/langinfo_h.m4 (gl_LANGINFO_H): Likewise. * m4/locale_h.m4 (gl_LOCALE_H): Likewise. * m4/math_h.m4 (gl_MATH_H): Likewise. * m4/search_h.m4 (gl_SEARCH_H): Likewise. * m4/signal_h.m4 (gl_SIGNAL_H): Likewise. * m4/spawn_h.m4 (gl_SPAWN_H): Likewise. * m4/stdio_h.m4 (gl_STDIO_H): Likewise. * m4/stdlib_h.m4 (gl_STDLIB_H): Likewise. * m4/string_h.m4 (gl_HEADER_STRING_H_BODY): Likewise. * m4/strings_h.m4 (gl_HEADER_STRINGS_H_BODY): Likewise. * m4/sys_file_h.m4 (gl_HEADER_SYS_FILE_H_DEFAULTS): Likewise. * m4/sys_ioctl_h.m4 (gl_SYS_IOCTL_H): Likewise. * m4/sys_select_h.m4 (gl_HEADER_SYS_SELECT): Likewise. * m4/sys_socket_h.m4 (gl_HEADER_SYS_SOCKET): Likewise. * m4/sys_stat_h.m4 (gl_HEADER_SYS_STAT_H): Likewise. * m4/sys_times_h.m4 (gl_SYS_TIMES_H): Likewise. * m4/sys_utsname_h.m4 (gl_SYS_UTSNAME_H): Likewise. * m4/unistd_h.m4 (gl_UNISTD_H): Likewise. * m4/wchar.m4 (gl_WCHAR_H): Likewise. * lib/arpa_inet.in.h: Use _GL_WARN_ON_USE instead of GL_LINK_WARNING. * lib/ctype.in.h: Likewise. * lib/dirent.in.h: Likewise. * lib/fcntl.in.h: Likewise. * lib/inttypes.in.h: Likewise. * lib/langinfo.in.h: Likewise. * lib/locale.in.h: Likewise. * lib/math.in.h: Likewise. * lib/search.in.h: Likewise. * lib/signal.in.h: Likewise. * lib/spawn.in.h: Likewise. * lib/stdio.in.h: Likewise. * lib/stdlib.in.h: Likewise. * lib/string.in.h: Likewise. * lib/strings.in.h: Likewise. * lib/sys_file.in.h: Likewise. * lib/sys_ioctl.in.h: Likewise. * lib/sys_select.in.h: Likewise. * lib/sys_socket.in.h: Likewise. * lib/sys_stat.in.h: Likewise. * lib/sys_times.in.h: Likewise. * lib/sys_utsname.in.h: Likewise. * lib/unistd.in.h: Likewise. * lib/wchar.in.h: Likewise. Signed-off-by: Eric Blake <ebb9@byu.net>
author Eric Blake <ebb9@byu.net>
date Wed, 16 Dec 2009 16:20:28 -0700
parents c2cbabec01dd
children 2f466cb40423
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1 # signal_h.m4 serial 9
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2 dnl Copyright (C) 2007, 2008, 2009, 2010 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 gl_CHECK_NEXT_HEADERS([signal.h])
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11 # AIX declares sig_atomic_t to already include volatile, and C89 compilers
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12 # then choke on 'volatile sig_atomic_t'. C99 requires that it compile.
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13 AC_CHECK_TYPE([volatile sig_atomic_t], [],
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14 [HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=0], [[
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15 #include <signal.h>
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16 ]])
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17 AC_REQUIRE([AC_TYPE_UID_T])
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18
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19 dnl Check for declarations of anything we want to poison if the
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20 dnl corresponding gnulib module is not in use.
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21 gl_WARN_ON_USE_PREPARE([[#include <signal.h>
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22 ]], [sigaction sigaddset sigdelset sigemptyset sigfillset sigismember
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23 sigpending sigprocmask])
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24 ])
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26 AC_DEFUN([gl_SIGNAL_MODULE_INDICATOR],
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27 [
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28 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
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29 AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
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30 GNULIB_[]m4_translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=1
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31 ])
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32
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33 AC_DEFUN([gl_SIGNAL_H_DEFAULTS],
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34 [
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35 GNULIB_SIGNAL_H_SIGPIPE=0; AC_SUBST([GNULIB_SIGNAL_H_SIGPIPE])
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36 GNULIB_SIGPROCMASK=0; AC_SUBST([GNULIB_SIGPROCMASK])
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37 GNULIB_SIGACTION=0; AC_SUBST([GNULIB_SIGACTION])
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38 dnl Assume proper GNU behavior unless another module says otherwise.
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39 HAVE_POSIX_SIGNALBLOCKING=1; AC_SUBST([HAVE_POSIX_SIGNALBLOCKING])
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40 HAVE_SIGSET_T=1; AC_SUBST([HAVE_SIGSET_T])
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41 HAVE_SIGINFO_T=1; AC_SUBST([HAVE_SIGINFO_T])
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42 HAVE_SIGACTION=1; AC_SUBST([HAVE_SIGACTION])
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43 HAVE_STRUCT_SIGACTION_SA_SIGACTION=1;
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44 AC_SUBST([HAVE_STRUCT_SIGACTION_SA_SIGACTION])
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45 HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=1;
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46 AC_SUBST([HAVE_TYPE_VOLATILE_SIG_ATOMIC_T])
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47 ])