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Update the configure.ac for autoconf >= 2.71 compatibility

Browse Source 
This mostly removes stuff that's either deprecated, obsolete or not used
at all:

* Update the minimal autoconf version to 2.69
* AC_PROG_CC_C99 is deprecated, just use AC_PROG_CC as we require C11
  anyway
* AC_HEADER_TIME is deprecated, both <sys/time.h> and <time.h> can be
  included at the same time, and we don't use the macros that
  AC_HEADER_TIME defines anywhere
* AC_HEADER_STDC checks for ISO C90 and we require at least C11
* Replace AC_TRY_*([]) with AC_*_IFELSE([AC_LANG_PROGRAM()])
* Update m4/ax_check_openssl.m4 from serial 10 to serial 11
* Update m4/ax_gcc_func_attribute.m4 from serial 10 to serial 13
* Update m4/ax_pthread.m4 from serial 24 to serial 30
* Add early AC_CANONICAL_TARGET call to prevent warning from AX_PTHREAD
This commit is contained in:
Ondřej Surý
2021-04-16 12:25:35 +02:00
parent fdf5184bf5
commit f52872c3ed
5 changed files with 239 additions and 191 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
config.h.win32
View File

@@ -78,9 +78,6 @@
/* Define if you have the ANSI C header files. */
#define STDC_HEADERS 1
/* Define if you can safely include both <sys/time.h> and <time.h>. */
#define TIME_WITH_SYS_TIME 1
/* define on DEC OSF to enable 4.4BSD style sa_len support */
/* #undef _SOCKADDR_LEN */
@@ -104,9 +101,6 @@
/* Define if you have the <sys/sockio.h> header file. */
#define HAVE_SYS_SOCKIO_H 1
/* Define if you have the <sys/time.h> header file. */
#define HAVE_SYS_TIME_H 1
/* Define if you have the <unistd.h> header file. */
#define HAVE_UNISTD_H 1

76
configure.ac
View File

@@ -10,7 +10,7 @@
#
# Defining the version in m4 requires a bit of dancing around,
# so the strings are properly concatenated, as you can't use
# a shell variable in AC_INIT()
# a shell variable in AC_INIT
#
m4_define([bind_VERSION_MAJOR], 9)dnl
m4_define([bind_VERSION_MINOR], 17)dnl
@@ -24,7 +24,7 @@ m4_define([bind_PKG_VERSION], [[bind_VERSION_MAJOR.bind_VERSION_MINOR.bind_VERSI
# Autoconf initialization
#
AC_INIT([BIND], bind_PKG_VERSION, [info@isc.org], [], [https://www.isc.org/downloads/])
AC_PREREQ(2.60)
AC_PREREQ([2.69])
AC_DEFINE([PACKAGE_VERSION_MAJOR], ["][bind_VERSION_MAJOR]["], [BIND 9 Major part of the version])
AC_DEFINE([PACKAGE_VERSION_MINOR], ["][bind_VERSION_MINOR]["], [BIND 9 Minor part of the version])
@@ -55,6 +55,13 @@ AC_DEFINE_UNQUOTED([PACKAGE_CONFIGARGS], ["$bind_CONFIGARGS"], [Either 'defaults
AC_DEFINE([PACKAGE_BUILDER], ["make"], [make or Visual Studio])
#
# Get the Canonical System Type
#
AC_CANONICAL_BUILD
AC_CANONICAL_HOST
AC_CANONICAL_TARGET
AC_CONFIG_SRCDIR([bin/named/main.c])
AM_INIT_AUTOMAKE([1.9 tar-pax foreign subdir-objects dist-xz no-dist-gzip -Wall -Werror])
AM_SILENT_RULES([yes])
@@ -75,12 +82,13 @@ AS_IF([test "$cross_compiling" = no],
# Enable system extensions to C and POSIX
#
AC_USE_SYSTEM_EXTENSIONS
AC_CANONICAL_HOST
#
# Compiler compatibility flags
#
AC_PROG_CC_C99
m4_version_prereq([2.70],
[AC_PROG_CC],
[AC_PROG_CC_C99])
AC_PROG_CPP_WERROR
#
@@ -320,8 +328,6 @@ AS_CASE([$host],
])
])
AC_HEADER_STDC
AC_CHECK_HEADERS([fcntl.h regex.h sys/time.h unistd.h sys/mman.h sys/sockio.h sys/select.h sys/param.h sys/sysctl.h net/if6.h sys/socket.h net/route.h linux/netlink.h linux/rtnetlink.h], [], [],
[$ac_includes_default
#ifdef HAVE_SYS_PARAM_H
@@ -389,8 +395,6 @@ AC_TYPE_SIZE_T
AC_TYPE_SSIZE_T
AC_TYPE_UINTPTR_T
AC_HEADER_TIME
#
# check for uname library routine
#
@@ -1089,14 +1093,16 @@ esac
AC_CHECK_FUNCS([tzset])
AC_MSG_CHECKING(for optarg declaration)
AC_TRY_COMPILE([
#include <unistd.h>
],
[optarg = 0;],
[AC_MSG_RESULT(yes)],
[AC_MSG_RESULT(no)
GEN_NEED_OPTARG="-DNEED_OPTARG=1"
AC_DEFINE(NEED_OPTARG, 1, [Defined if extern char *optarg is not declared.])])
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#include <unistd.h>]],
[[optarg = 0;]]
)],
[AC_MSG_RESULT(yes)],
[AC_MSG_RESULT(no)
GEN_NEED_OPTARG="-DNEED_OPTARG=1"
AC_DEFINE(NEED_OPTARG, 1, [Defined if extern char *optarg is not declared.])]
)
#
# Check for nanoseconds in file stats
@@ -1205,15 +1211,16 @@ AC_LINK_IFELSE(
# Check for __builtin_expect
#
AC_MSG_CHECKING([compiler support for __builtin_expect])
AC_TRY_LINK(, [
return (__builtin_expect(1, 1) ? 1 : 0);
], [
have_builtin_expect=yes
AC_MSG_RESULT(yes)
], [
have_builtin_expect=no
AC_MSG_RESULT(no)
])
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[]],
[[return (__builtin_expect(1, 1) ? 1 : 0);]]
)],
[have_builtin_expect=yes
AC_MSG_RESULT(yes)],
[have_builtin_expect=no
AC_MSG_RESULT(no)]
)
if test "yes" = "$have_builtin_expect"; then
AC_DEFINE(HAVE_BUILTIN_EXPECT, 1, [Define to 1 if the compiler supports __builtin_expect.])
fi
@@ -1222,15 +1229,16 @@ fi
# Check for __builtin_clz
#
AC_MSG_CHECKING([compiler support for __builtin_clz])
AC_TRY_LINK(, [
return (__builtin_clz(0xff) == 24 ? 1 : 0);
], [
have_builtin_clz=yes
AC_MSG_RESULT(yes)
], [
have_builtin_clz=no
AC_MSG_RESULT(no)
])
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[]],
[[return (__builtin_clz(0xff) == 24 ? 1 : 0);]]
)],
[have_builtin_clz=yes
AC_MSG_RESULT(yes)],
[have_builtin_clz=no
AC_MSG_RESULT(no)]
)
if test "yes" = "$have_builtin_clz"; then
AC_DEFINE(HAVE_BUILTIN_CLZ, 1, [Define to 1 if the compiler supports __builtin_clz.])
fi

79
m4/ax_check_openssl.m4
View File

@@ -13,6 +13,7 @@
#
# OPENSSL_CFLAGS to the include directives required
# OPENSSL_LIBS to the -l directives required
# OPENSSL_LDFLAGS to the -L or -R flags required
#
# and calls ACTION-IF-FOUND or ACTION-IF-NOT-FOUND appropriately
#
@@ -31,75 +32,81 @@
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 10
#serial 11
AU_ALIAS([CHECK_SSL], [AX_CHECK_OPENSSL])
AC_DEFUN([AX_CHECK_OPENSSL], [
found=false
default_ssldirs="/usr/local/ssl /usr/lib/ssl /usr/ssl /usr/pkg /usr/local /opt/local /usr/local/opt/openssl /usr/local/opt/libressl /usr"
AC_ARG_WITH([openssl],
[AS_HELP_STRING([--with-openssl=DIR],
[root of the OpenSSL directory])],
[
AS_CASE([$with_openssl],
[""|y|ye|yes],[ssldirs="$default_ssldirs"],
[n|no],[AC_MSG_ERROR([Invalid --with-openssl value])],
[*],[ssldirs="$withval"],
[ssldirs="$default_ssldirs"]
)
case "$withval" in
"" | y | ye | yes | n | no)
AC_MSG_ERROR([Invalid --with-openssl value])
;;
*) ssldirs="$withval"
;;
esac
], [
# if pkg-config is installed and openssl has installed a .pc file,
# then use that information and don't search ssldirs
PKG_CHECK_MODULES([OPENSSL], [crypto],
[found=true],
[ssldirs="$default_ssldirs"])
AC_CHECK_TOOL([PKG_CONFIG], [pkg-config])
if test x"$PKG_CONFIG" != x""; then
OPENSSL_LDFLAGS=`$PKG_CONFIG openssl --libs-only-L 2>/dev/null`
if test $? = 0; then
OPENSSL_LIBS=`$PKG_CONFIG openssl --libs-only-l 2>/dev/null`
OPENSSL_CFLAGS=`$PKG_CONFIG openssl --cflags-only-I 2>/dev/null`
found=true
fi
fi
# no such luck; use some default ssldirs
if ! $found; then
ssldirs="/usr/local/ssl /usr/lib/ssl /usr/ssl /usr/pkg /usr/local /usr"
fi
]
)
)
# note that we #include <openssl/foo.h>, so the OpenSSL headers have to be in
# an 'openssl' subdirectory
AS_IF([! $found],[
if ! $found; then
OPENSSL_CFLAGS=
for ssldir in $ssldirs; do
AC_MSG_CHECKING([for openssl/ssl.h in $ssldir])
AS_IF([test -f "$ssldir/include/openssl/ssl.h"],
[
OPENSSL_CFLAGS="-I$ssldir/include"
OPENSSL_LIBS="-L$ssldir/lib -lssl -lcrypto"
found=true
AC_MSG_RESULT([yes])
break
],
[
AC_MSG_RESULT([no])
])
AC_MSG_CHECKING([for include/openssl/ssl.h in $ssldir])
if test -f "$ssldir/include/openssl/ssl.h"; then
OPENSSL_CFLAGS="-I$ssldir/include"
OPENSSL_LDFLAGS="-L$ssldir/lib"
OPENSSL_LIBS="-lssl -lcrypto"
found=true
AC_MSG_RESULT([yes])
break
else
AC_MSG_RESULT([no])
fi
done
# if the file wasn't found, well, go ahead and try the link anyway -- maybe
# it will just work!
])
fi
# try the preprocessor and linker with our new flags,
# being careful not to pollute the global LIBS, LDFLAGS, and CPPFLAGS
AC_MSG_CHECKING([whether compiling and linking against OpenSSL works])
# AC_MSG_NOTICE([Trying link with OPENSSL_LIBS=$OPENSSL_LIBS; OPENSSL_CFLAGS=$OPENSSL_CFLAGS])
echo "Trying link with OPENSSL_LDFLAGS=$OPENSSL_LDFLAGS;" \
"OPENSSL_LIBS=$OPENSSL_LIBS; OPENSSL_CFLAGS=$OPENSSL_CFLAGS" >&AS_MESSAGE_LOG_FD
save_LIBS="$LIBS"
save_LDFLAGS="$LDFLAGS"
save_CPPFLAGS="$CPPFLAGS"
LDFLAGS="$LDFLAGS $OPENSSL_LDFLAGS"
LIBS="$OPENSSL_LIBS $LIBS"
CPPFLAGS="$OPENSSL_CFLAGS $CPPFLAGS"
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[
#include <openssl/crypto.h>
],
[
OPENSSL_free(NULL);
])],
[AC_LANG_PROGRAM([#include <openssl/ssl.h>], [SSL_new(NULL)])],
[
AC_MSG_RESULT([yes])
$1
@@ -108,8 +115,10 @@ AC_DEFUN([AX_CHECK_OPENSSL], [
$2
])
CPPFLAGS="$save_CPPFLAGS"
LDFLAGS="$save_LDFLAGS"
LIBS="$save_LIBS"
AC_SUBST([OPENSSL_CFLAGS])
AC_SUBST([OPENSSL_LIBS])
AC_SUBST([OPENSSL_LDFLAGS])
])

6
m4/ax_gcc_func_attribute.m4
View File

@@ -78,7 +78,7 @@
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 10
#serial 13
AC_DEFUN([AX_GCC_FUNC_ATTRIBUTE], [
AS_VAR_PUSHDEF([ac_var], [ax_cv_have_func_attribute_$1])
@@ -133,7 +133,7 @@ AC_DEFUN([AX_GCC_FUNC_ATTRIBUTE], [
int foo( void ) __attribute__(($1));
],
[fallthrough], [
int foo( void ) {switch (0) { case 1: __attribute__(($1)); case 2: break ; }};
void foo( int x ) {switch (x) { case 1: __attribute__(($1)); case 2: break ; }};
],
[flatten], [
int foo( void ) __attribute__(($1));
@@ -228,7 +228,7 @@ AC_DEFUN([AX_GCC_FUNC_ATTRIBUTE], [
dnl GCC doesn't exit with an error if an unknown attribute is
dnl provided but only outputs a warning, so accept the attribute
dnl only if no warning were issued.
[AS_IF([test -s conftest.err],
[AS_IF([grep -- -Wattributes conftest.err],
[AS_VAR_SET([ac_var], [no])],
[AS_VAR_SET([ac_var], [yes])])],
[AS_VAR_SET([ac_var], [no])])

263
m4/ax_pthread.m4
View File

@@ -14,20 +14,24 @@
# flags that are needed. (The user can also force certain compiler
# flags/libs to be tested by setting these environment variables.)
#
# Also sets PTHREAD_CC to any special C compiler that is needed for
# multi-threaded programs (defaults to the value of CC otherwise). (This
# is necessary on AIX to use the special cc_r compiler alias.)
# Also sets PTHREAD_CC and PTHREAD_CXX to any special C compiler that is
# needed for multi-threaded programs (defaults to the value of CC
# respectively CXX otherwise). (This is necessary on e.g. AIX to use the
# special cc_r/CC_r compiler alias.)
#
# NOTE: You are assumed to not only compile your program with these flags,
# but also to link with them as well. For example, you might link with
# $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS
# $PTHREAD_CXX $CXXFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS
#
# If you are only building threaded programs, you may wish to use these
# variables in your default LIBS, CFLAGS, and CC:
#
# LIBS="$PTHREAD_LIBS $LIBS"
# CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
# CXXFLAGS="$CXXFLAGS $PTHREAD_CFLAGS"
# CC="$PTHREAD_CC"
# CXX="$PTHREAD_CXX"
#
# In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute constant
# has a nonstandard name, this macro defines PTHREAD_CREATE_JOINABLE to
@@ -55,6 +59,7 @@
#
# Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
# Copyright (c) 2011 Daniel Richard G. <skunk@iSKUNK.ORG>
# Copyright (c) 2019 Marc Stevens <marc.stevens@cwi.nl>
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
@@ -82,11 +87,11 @@
# modified version of the Autoconf Macro, you may extend this special
# exception to the GPL to apply to your modified version as well.
#serial 24
#serial 30
AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD])
AC_DEFUN([AX_PTHREAD], [
AC_REQUIRE([AC_CANONICAL_HOST])
AC_REQUIRE([AC_CANONICAL_TARGET])
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_PROG_SED])
AC_LANG_PUSH([C])
@@ -104,6 +109,7 @@ if test "x$PTHREAD_CFLAGS$PTHREAD_LIBS" != "x"; then
ax_pthread_save_CFLAGS="$CFLAGS"
ax_pthread_save_LIBS="$LIBS"
AS_IF([test "x$PTHREAD_CC" != "x"], [CC="$PTHREAD_CC"])
AS_IF([test "x$PTHREAD_CXX" != "x"], [CXX="$PTHREAD_CXX"])
CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
LIBS="$PTHREAD_LIBS $LIBS"
AC_MSG_CHECKING([for pthread_join using $CC $PTHREAD_CFLAGS $PTHREAD_LIBS])
@@ -123,10 +129,12 @@ fi
# (e.g. DEC) have both -lpthread and -lpthreads, where one of the
# libraries is broken (non-POSIX).
# Create a list of thread flags to try. Items starting with a "-" are
# C compiler flags, and other items are library names, except for "none"
# which indicates that we try without any flags at all, and "pthread-config"
# which is a program returning the flags for the Pth emulation library.
# Create a list of thread flags to try. Items with a "," contain both
# C compiler flags (before ",") and linker flags (after ","). Other items
# starting with a "-" are C compiler flags, and remaining items are
# library names, except for "none" which indicates that we try without
# any flags at all, and "pthread-config" which is a program returning
# the flags for the Pth emulation library.
ax_pthread_flags="pthreads none -Kthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
@@ -150,7 +158,7 @@ ax_pthread_flags="pthreads none -Kthread -pthread -pthreads -mthreads pthread --
# --thread-safe: KAI C++
# pthread-config: use pthread-config program (for GNU Pth library)
case $host_os in
case $target_os in
freebsd*)
@@ -194,36 +202,10 @@ case $host_os in
# that too in a future libc.) So we'll check first for the
# standard Solaris way of linking pthreads (-mt -lpthread).
ax_pthread_flags="-mt,pthread pthread $ax_pthread_flags"
ax_pthread_flags="-mt,-lpthread pthread $ax_pthread_flags"
;;
esac
# GCC generally uses -pthread, or -pthreads on some platforms (e.g. SPARC)
AS_IF([test "x$GCC" = "xyes"],
[ax_pthread_flags="-pthread -pthreads $ax_pthread_flags"])
# The presence of a feature test macro requesting re-entrant function
# definitions is, on some systems, a strong hint that pthreads support is
# correctly enabled
case $host_os in
darwin* | hpux* | linux* | osf* | solaris*)
ax_pthread_check_macro="_REENTRANT"
;;
aix*)
ax_pthread_check_macro="_THREAD_SAFE"
;;
*)
ax_pthread_check_macro="--"
;;
esac
AS_IF([test "x$ax_pthread_check_macro" = "x--"],
[ax_pthread_check_cond=0],
[ax_pthread_check_cond="!defined($ax_pthread_check_macro)"])
# Are we compiling with Clang?
AC_CACHE_CHECK([whether $CC is Clang],
@@ -242,83 +224,47 @@ AC_CACHE_CHECK([whether $CC is Clang],
])
ax_pthread_clang="$ax_cv_PTHREAD_CLANG"
ax_pthread_clang_warning=no
# Clang needs special handling, because older versions handle the -pthread
# option in a rather... idiosyncratic way
# GCC generally uses -pthread, or -pthreads on some platforms (e.g. SPARC)
if test "x$ax_pthread_clang" = "xyes"; then
# Note that for GCC and Clang -pthread generally implies -lpthread,
# except when -nostdlib is passed.
# This is problematic using libtool to build C++ shared libraries with pthread:
# [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=25460
# [2] https://bugzilla.redhat.com/show_bug.cgi?id=661333
# [3] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=468555
# To solve this, first try -pthread together with -lpthread for GCC
# Clang takes -pthread; it has never supported any other flag
AS_IF([test "x$GCC" = "xyes"],
[ax_pthread_flags="-pthread,-lpthread -pthread -pthreads $ax_pthread_flags"])
# (Note 1: This will need to be revisited if a system that Clang
# supports has POSIX threads in a separate library. This tends not
# to be the way of modern systems, but it's conceivable.)
# Clang takes -pthread (never supported any other flag), but we'll try with -lpthread first
# (Note 2: On some systems, notably Darwin, -pthread is not needed
# to get POSIX threads support; the API is always present and
# active. We could reasonably leave PTHREAD_CFLAGS empty. But
# -pthread does define _REENTRANT, and while the Darwin headers
# ignore this macro, third-party headers might not.)
AS_IF([test "x$ax_pthread_clang" = "xyes"],
[ax_pthread_flags="-pthread,-lpthread -pthread"])
PTHREAD_CFLAGS="-pthread"
PTHREAD_LIBS=
ax_pthread_ok=yes
# The presence of a feature test macro requesting re-entrant function
# definitions is, on some systems, a strong hint that pthreads support is
# correctly enabled
# However, older versions of Clang make a point of warning the user
# that, in an invocation where only linking and no compilation is
# taking place, the -pthread option has no effect ("argument unused
# during compilation"). They expect -pthread to be passed in only
# when source code is being compiled.
#
# Problem is, this is at odds with the way Automake and most other
# C build frameworks function, which is that the same flags used in
# compilation (CFLAGS) are also used in linking. Many systems
# supported by AX_PTHREAD require exactly this for POSIX threads
# support, and in fact it is often not straightforward to specify a
# flag that is used only in the compilation phase and not in
# linking. Such a scenario is extremely rare in practice.
#
# Even though use of the -pthread flag in linking would only print
# a warning, this can be a nuisance for well-run software projects
# that build with -Werror. So if the active version of Clang has
# this misfeature, we search for an option to squash it.
case $target_os in
darwin* | hpux* | linux* | osf* | solaris*)
ax_pthread_check_macro="_REENTRANT"
;;
AC_CACHE_CHECK([whether Clang needs flag to prevent "argument unused" warning when linking with -pthread],
[ax_cv_PTHREAD_CLANG_NO_WARN_FLAG],
[ax_cv_PTHREAD_CLANG_NO_WARN_FLAG=unknown
# Create an alternate version of $ac_link that compiles and
# links in two steps (.c -> .o, .o -> exe) instead of one
# (.c -> exe), because the warning occurs only in the second
# step
ax_pthread_save_ac_link="$ac_link"
ax_pthread_sed='s/conftest\.\$ac_ext/conftest.$ac_objext/g'
ax_pthread_link_step=`$as_echo "$ac_link" | sed "$ax_pthread_sed"`
ax_pthread_2step_ac_link="($ac_compile) && (echo ==== >&5) && ($ax_pthread_link_step)"
ax_pthread_save_CFLAGS="$CFLAGS"
for ax_pthread_try in '' -Qunused-arguments -Wno-unused-command-line-argument unknown; do
AS_IF([test "x$ax_pthread_try" = "xunknown"], [break])
CFLAGS="-Werror -Wunknown-warning-option $ax_pthread_try -pthread $ax_pthread_save_CFLAGS"
ac_link="$ax_pthread_save_ac_link"
AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
[ac_link="$ax_pthread_2step_ac_link"
AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
[break])
])
done
ac_link="$ax_pthread_save_ac_link"
CFLAGS="$ax_pthread_save_CFLAGS"
AS_IF([test "x$ax_pthread_try" = "x"], [ax_pthread_try=no])
ax_cv_PTHREAD_CLANG_NO_WARN_FLAG="$ax_pthread_try"
])
aix*)
ax_pthread_check_macro="_THREAD_SAFE"
;;
case "$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG" in
no | unknown) ;;
*) PTHREAD_CFLAGS="$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG $PTHREAD_CFLAGS" ;;
esac
*)
ax_pthread_check_macro="--"
;;
esac
AS_IF([test "x$ax_pthread_check_macro" = "x--"],
[ax_pthread_check_cond=0],
[ax_pthread_check_cond="!defined($ax_pthread_check_macro)"])
fi # $ax_pthread_clang = yes
if test "x$ax_pthread_ok" = "xno"; then
for ax_pthread_try_flag in $ax_pthread_flags; do
@@ -328,10 +274,10 @@ for ax_pthread_try_flag in $ax_pthread_flags; do
AC_MSG_CHECKING([whether pthreads work without any flags])
;;
-mt,pthread)
AC_MSG_CHECKING([whether pthreads work with -mt -lpthread])
PTHREAD_CFLAGS="-mt"
PTHREAD_LIBS="-lpthread"
*,*)
PTHREAD_CFLAGS=`echo $ax_pthread_try_flag | sed "s/^\(.*\),\(.*\)$/\1/"`
PTHREAD_LIBS=`echo $ax_pthread_try_flag | sed "s/^\(.*\),\(.*\)$/\2/"`
AC_MSG_CHECKING([whether pthreads work with "$PTHREAD_CFLAGS" and "$PTHREAD_LIBS"])
;;
-*)
@@ -371,7 +317,13 @@ for ax_pthread_try_flag in $ax_pthread_flags; do
# if $ax_pthread_check_cond
# error "$ax_pthread_check_macro must be defined"
# endif
static void routine(void *a) { a = 0; }
static void *some_global = NULL;
static void routine(void *a)
{
/* To avoid any unused-parameter or
unused-but-set-parameter warning. */
some_global = a;
}
static void *start_routine(void *a) { return a; }],
[pthread_t th; pthread_attr_t attr;
pthread_create(&th, 0, start_routine, 0);
@@ -393,6 +345,80 @@ for ax_pthread_try_flag in $ax_pthread_flags; do
done
fi
# Clang needs special handling, because older versions handle the -pthread
# option in a rather... idiosyncratic way
if test "x$ax_pthread_clang" = "xyes"; then
# Clang takes -pthread; it has never supported any other flag
# (Note 1: This will need to be revisited if a system that Clang
# supports has POSIX threads in a separate library. This tends not
# to be the way of modern systems, but it's conceivable.)
# (Note 2: On some systems, notably Darwin, -pthread is not needed
# to get POSIX threads support; the API is always present and
# active. We could reasonably leave PTHREAD_CFLAGS empty. But
# -pthread does define _REENTRANT, and while the Darwin headers
# ignore this macro, third-party headers might not.)
# However, older versions of Clang make a point of warning the user
# that, in an invocation where only linking and no compilation is
# taking place, the -pthread option has no effect ("argument unused
# during compilation"). They expect -pthread to be passed in only
# when source code is being compiled.
#
# Problem is, this is at odds with the way Automake and most other
# C build frameworks function, which is that the same flags used in
# compilation (CFLAGS) are also used in linking. Many systems
# supported by AX_PTHREAD require exactly this for POSIX threads
# support, and in fact it is often not straightforward to specify a
# flag that is used only in the compilation phase and not in
# linking. Such a scenario is extremely rare in practice.
#
# Even though use of the -pthread flag in linking would only print
# a warning, this can be a nuisance for well-run software projects
# that build with -Werror. So if the active version of Clang has
# this misfeature, we search for an option to squash it.
AC_CACHE_CHECK([whether Clang needs flag to prevent "argument unused" warning when linking with -pthread],
[ax_cv_PTHREAD_CLANG_NO_WARN_FLAG],
[ax_cv_PTHREAD_CLANG_NO_WARN_FLAG=unknown
# Create an alternate version of $ac_link that compiles and
# links in two steps (.c -> .o, .o -> exe) instead of one
# (.c -> exe), because the warning occurs only in the second
# step
ax_pthread_save_ac_link="$ac_link"
ax_pthread_sed='s/conftest\.\$ac_ext/conftest.$ac_objext/g'
ax_pthread_link_step=`AS_ECHO(["$ac_link"]) | sed "$ax_pthread_sed"`
ax_pthread_2step_ac_link="($ac_compile) && (echo ==== >&5) && ($ax_pthread_link_step)"
ax_pthread_save_CFLAGS="$CFLAGS"
for ax_pthread_try in '' -Qunused-arguments -Wno-unused-command-line-argument unknown; do
AS_IF([test "x$ax_pthread_try" = "xunknown"], [break])
CFLAGS="-Werror -Wunknown-warning-option $ax_pthread_try -pthread $ax_pthread_save_CFLAGS"
ac_link="$ax_pthread_save_ac_link"
AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
[ac_link="$ax_pthread_2step_ac_link"
AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
[break])
])
done
ac_link="$ax_pthread_save_ac_link"
CFLAGS="$ax_pthread_save_CFLAGS"
AS_IF([test "x$ax_pthread_try" = "x"], [ax_pthread_try=no])
ax_cv_PTHREAD_CLANG_NO_WARN_FLAG="$ax_pthread_try"
])
case "$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG" in
no | unknown) ;;
*) PTHREAD_CFLAGS="$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG $PTHREAD_CFLAGS" ;;
esac
fi # $ax_pthread_clang = yes
# Various other checks:
if test "x$ax_pthread_ok" = "xyes"; then
ax_pthread_save_CFLAGS="$CFLAGS"
@@ -424,7 +450,7 @@ if test "x$ax_pthread_ok" = "xyes"; then
AC_CACHE_CHECK([whether more special flags are required for pthreads],
[ax_cv_PTHREAD_SPECIAL_FLAGS],
[ax_cv_PTHREAD_SPECIAL_FLAGS=no
case $host_os in
case $target_os in
solaris*)
ax_cv_PTHREAD_SPECIAL_FLAGS="-D_POSIX_PTHREAD_SEMANTICS"
;;
@@ -438,7 +464,8 @@ if test "x$ax_pthread_ok" = "xyes"; then
AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT],
[ax_cv_PTHREAD_PRIO_INHERIT],
[AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>]],
[[int i = PTHREAD_PRIO_INHERIT;]])],
[[int i = PTHREAD_PRIO_INHERIT;
return i;]])],
[ax_cv_PTHREAD_PRIO_INHERIT=yes],
[ax_cv_PTHREAD_PRIO_INHERIT=no])
])
@@ -453,25 +480,35 @@ if test "x$ax_pthread_ok" = "xyes"; then
# More AIX lossage: compile with *_r variant
if test "x$GCC" != "xyes"; then
case $host_os in
case $target_os in
aix*)
AS_CASE(["x/$CC"],
[x*/c89|x*/c89_128|x*/c99|x*/c99_128|x*/cc|x*/cc128|x*/xlc|x*/xlc_v6|x*/xlc128|x*/xlc128_v6],
[#handle absolute path differently from PATH based program lookup
AS_CASE(["x$CC"],
[x/*],
[AS_IF([AS_EXECUTABLE_P([${CC}_r])],[PTHREAD_CC="${CC}_r"])],
[AC_CHECK_PROGS([PTHREAD_CC],[${CC}_r],[$CC])])])
[
AS_IF([AS_EXECUTABLE_P([${CC}_r])],[PTHREAD_CC="${CC}_r"])
AS_IF([test "x${CXX}" != "x"], [AS_IF([AS_EXECUTABLE_P([${CXX}_r])],[PTHREAD_CXX="${CXX}_r"])])
],
[
AC_CHECK_PROGS([PTHREAD_CC],[${CC}_r],[$CC])
AS_IF([test "x${CXX}" != "x"], [AC_CHECK_PROGS([PTHREAD_CXX],[${CXX}_r],[$CXX])])
]
)
])
;;
esac
fi
fi
test -n "$PTHREAD_CC" || PTHREAD_CC="$CC"
test -n "$PTHREAD_CXX" || PTHREAD_CXX="$CXX"
AC_SUBST([PTHREAD_LIBS])
AC_SUBST([PTHREAD_CFLAGS])
AC_SUBST([PTHREAD_CC])
AC_SUBST([PTHREAD_CXX])
# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
if test "x$ax_pthread_ok" = "xyes"; then