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[libmicrohttpd] branch master updated: updated m4/ax_*.m4 macros
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From: |
gnunet |
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Subject: |
[libmicrohttpd] branch master updated: updated m4/ax_*.m4 macros |
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Date: |
Wed, 23 Dec 2020 20:58:38 +0100 |
This is an automated email from the git hooks/post-receive script.
karlson2k pushed a commit to branch master
in repository libmicrohttpd.
The following commit(s) were added to refs/heads/master by this push:
new e8ee7c64 updated m4/ax_*.m4 macros
e8ee7c64 is described below
commit e8ee7c64bd2ecde31014df24141fa0e0b2ad554a
Author: Evgeny Grin (Karlson2k) <k2k@narod.ru>
AuthorDate: Wed Dec 23 22:57:55 2020 +0300
updated m4/ax_*.m4 macros
---
m4/ax_append_compile_flags.m4 | 31 +-----
m4/ax_append_flag.m4 | 31 +-----
m4/ax_append_link_flags.m4 | 31 +-----
m4/ax_check_compile_flag.m4 | 31 +-----
m4/ax_check_link_flag.m4 | 31 +-----
m4/ax_have_epoll.m4 | 12 +--
m4/ax_pthread.m4 | 219 ++++++++++++++++++++++--------------------
7 files changed, 148 insertions(+), 238 deletions(-)
diff --git a/m4/ax_append_compile_flags.m4 b/m4/ax_append_compile_flags.m4
index 5b6f1af5..9c856356 100644
--- a/m4/ax_append_compile_flags.m4
+++ b/m4/ax_append_compile_flags.m4
@@ -30,33 +30,12 @@
#
# Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
#
-# 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
-# Free Software Foundation, either version 3 of the License, or (at your
-# option) any later version.
-#
-# This program is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
-# Public License for more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program. If not, see <https://www.gnu.org/licenses/>.
-#
-# As a special exception, the respective Autoconf Macro's copyright owner
-# gives unlimited permission to copy, distribute and modify the configure
-# scripts that are the output of Autoconf when processing the Macro. You
-# need not follow the terms of the GNU General Public License when using
-# or distributing such scripts, even though portions of the text of the
-# Macro appear in them. The GNU General Public License (GPL) does govern
-# all other use of the material that constitutes the Autoconf Macro.
-#
-# This special exception to the GPL applies to versions of the Autoconf
-# Macro released by the Autoconf Archive. When you make and distribute a
-# modified version of the Autoconf Macro, you may extend this special
-# exception to the GPL to apply to your modified version as well.
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice
+# and this notice are preserved. This file is offered as-is, without any
+# warranty.
-#serial 6
+#serial 7
AC_DEFUN([AX_APPEND_COMPILE_FLAGS],
[AX_REQUIRE_DEFINED([AX_CHECK_COMPILE_FLAG])
diff --git a/m4/ax_append_flag.m4 b/m4/ax_append_flag.m4
index e8c5312a..dd6d8b61 100644
--- a/m4/ax_append_flag.m4
+++ b/m4/ax_append_flag.m4
@@ -23,33 +23,12 @@
# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
# Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
#
-# 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
-# Free Software Foundation, either version 3 of the License, or (at your
-# option) any later version.
-#
-# This program is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
-# Public License for more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program. If not, see <https://www.gnu.org/licenses/>.
-#
-# As a special exception, the respective Autoconf Macro's copyright owner
-# gives unlimited permission to copy, distribute and modify the configure
-# scripts that are the output of Autoconf when processing the Macro. You
-# need not follow the terms of the GNU General Public License when using
-# or distributing such scripts, even though portions of the text of the
-# Macro appear in them. The GNU General Public License (GPL) does govern
-# all other use of the material that constitutes the Autoconf Macro.
-#
-# This special exception to the GPL applies to versions of the Autoconf
-# Macro released by the Autoconf Archive. When you make and distribute a
-# modified version of the Autoconf Macro, you may extend this special
-# exception to the GPL to apply to your modified version as well.
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice
+# and this notice are preserved. This file is offered as-is, without any
+# warranty.
-#serial 7
+#serial 8
AC_DEFUN([AX_APPEND_FLAG],
[dnl
diff --git a/m4/ax_append_link_flags.m4 b/m4/ax_append_link_flags.m4
index 6f7f1745..99b9fa5b 100644
--- a/m4/ax_append_link_flags.m4
+++ b/m4/ax_append_link_flags.m4
@@ -28,33 +28,12 @@
#
# Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
#
-# 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
-# Free Software Foundation, either version 3 of the License, or (at your
-# option) any later version.
-#
-# This program is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
-# Public License for more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program. If not, see <https://www.gnu.org/licenses/>.
-#
-# As a special exception, the respective Autoconf Macro's copyright owner
-# gives unlimited permission to copy, distribute and modify the configure
-# scripts that are the output of Autoconf when processing the Macro. You
-# need not follow the terms of the GNU General Public License when using
-# or distributing such scripts, even though portions of the text of the
-# Macro appear in them. The GNU General Public License (GPL) does govern
-# all other use of the material that constitutes the Autoconf Macro.
-#
-# This special exception to the GPL applies to versions of the Autoconf
-# Macro released by the Autoconf Archive. When you make and distribute a
-# modified version of the Autoconf Macro, you may extend this special
-# exception to the GPL to apply to your modified version as well.
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice
+# and this notice are preserved. This file is offered as-is, without any
+# warranty.
-#serial 6
+#serial 7
AC_DEFUN([AX_APPEND_LINK_FLAGS],
[AX_REQUIRE_DEFINED([AX_CHECK_LINK_FLAG])
diff --git a/m4/ax_check_compile_flag.m4 b/m4/ax_check_compile_flag.m4
index dcabb92a..bd753b34 100644
--- a/m4/ax_check_compile_flag.m4
+++ b/m4/ax_check_compile_flag.m4
@@ -29,33 +29,12 @@
# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
# Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
#
-# 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
-# Free Software Foundation, either version 3 of the License, or (at your
-# option) any later version.
-#
-# This program is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
-# Public License for more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program. If not, see <https://www.gnu.org/licenses/>.
-#
-# As a special exception, the respective Autoconf Macro's copyright owner
-# gives unlimited permission to copy, distribute and modify the configure
-# scripts that are the output of Autoconf when processing the Macro. You
-# need not follow the terms of the GNU General Public License when using
-# or distributing such scripts, even though portions of the text of the
-# Macro appear in them. The GNU General Public License (GPL) does govern
-# all other use of the material that constitutes the Autoconf Macro.
-#
-# This special exception to the GPL applies to versions of the Autoconf
-# Macro released by the Autoconf Archive. When you make and distribute a
-# modified version of the Autoconf Macro, you may extend this special
-# exception to the GPL to apply to your modified version as well.
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice
+# and this notice are preserved. This file is offered as-is, without any
+# warranty.
-#serial 5
+#serial 6
AC_DEFUN([AX_CHECK_COMPILE_FLAG],
[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
diff --git a/m4/ax_check_link_flag.m4 b/m4/ax_check_link_flag.m4
index 819409a2..03a30ce4 100644
--- a/m4/ax_check_link_flag.m4
+++ b/m4/ax_check_link_flag.m4
@@ -29,33 +29,12 @@
# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
# Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
#
-# 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
-# Free Software Foundation, either version 3 of the License, or (at your
-# option) any later version.
-#
-# This program is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
-# Public License for more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program. If not, see <https://www.gnu.org/licenses/>.
-#
-# As a special exception, the respective Autoconf Macro's copyright owner
-# gives unlimited permission to copy, distribute and modify the configure
-# scripts that are the output of Autoconf when processing the Macro. You
-# need not follow the terms of the GNU General Public License when using
-# or distributing such scripts, even though portions of the text of the
-# Macro appear in them. The GNU General Public License (GPL) does govern
-# all other use of the material that constitutes the Autoconf Macro.
-#
-# This special exception to the GPL applies to versions of the Autoconf
-# Macro released by the Autoconf Archive. When you make and distribute a
-# modified version of the Autoconf Macro, you may extend this special
-# exception to the GPL to apply to your modified version as well.
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice
+# and this notice are preserved. This file is offered as-is, without any
+# warranty.
-#serial 5
+#serial 6
AC_DEFUN([AX_CHECK_LINK_FLAG],
[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
diff --git a/m4/ax_have_epoll.m4 b/m4/ax_have_epoll.m4
index 9d9bc873..8b23e1aa 100644
--- a/m4/ax_have_epoll.m4
+++ b/m4/ax_have_epoll.m4
@@ -42,7 +42,7 @@
# and this notice are preserved. This file is offered as-is, without any
# warranty.
-#serial 11
+#serial 12
AC_DEFUN([AX_HAVE_EPOLL], [dnl
ax_have_epoll_cppflags="${CPPFLAGS}"
@@ -59,10 +59,10 @@ AC_DEFUN([AX_HAVE_EPOLL], [dnl
# endif
#endif
], [dnl
-int fd, rc;
+int fd;
struct epoll_event ev;
fd = epoll_create(128);
-rc = epoll_wait(fd, &ev, 1, 0);])],
+epoll_wait(fd, &ev, 1, 0);])],
[ax_cv_have_epoll=yes],
[ax_cv_have_epoll=no])])
CPPFLAGS="${ax_have_epoll_cppflags}"
@@ -89,11 +89,11 @@ AC_DEFUN([AX_HAVE_EPOLL_PWAIT], [dnl
#include <sys/epoll.h>
#include <signal.h>
], [dnl
-int fd, rc;
+int fd;
struct epoll_event ev;
fd = epoll_create(128);
-rc = epoll_wait(fd, &ev, 1, 0);
-rc = epoll_pwait(fd, &ev, 1, 0, (sigset_t const *)(0));])],
+epoll_wait(fd, &ev, 1, 0);
+epoll_pwait(fd, &ev, 1, 0, (sigset_t const *)(0));])],
[ax_cv_have_epoll_pwait=yes],
[ax_cv_have_epoll_pwait=no])])
CPPFLAGS="${ax_have_epoll_cppflags}"
diff --git a/m4/ax_pthread.m4 b/m4/ax_pthread.m4
index 0300e4ed..1598d077 100644
--- a/m4/ax_pthread.m4
+++ b/m4/ax_pthread.m4
@@ -55,6 +55,7 @@
#
# 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
@@ -82,7 +83,7 @@
# modified version of the Autoconf Macro, you may extend this special
# exception to the GPL to apply to your modified version as well.
-#serial 26
+#serial 27
AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD])
AC_DEFUN([AX_PTHREAD], [
@@ -123,10 +124,12 @@ 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"
@@ -194,36 +197,10 @@ 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 +219,47 @@ 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 $host_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 +269,10 @@ 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"])
;;
-*)
@@ -399,6 +340,80 @@ 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"
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