Build: Update m4/ax_pthread.m4 from Autoconf Archive (again).
This commit is contained in:
Lasse Collin
parent
7812002dd3
commit
a3148c0446
227
m4/ax_pthread.m4
227
m4/ax_pthread.m4
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@ -55,6 +55,7 @@
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#
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# Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
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# Copyright (c) 2011 Daniel Richard G. <skunk@iSKUNK.ORG>
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# Copyright (c) 2019 Marc Stevens <marc.stevens@cwi.nl>
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#
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# This program is free software: you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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@ -82,7 +83,7 @@
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# modified version of the Autoconf Macro, you may extend this special
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# exception to the GPL to apply to your modified version as well.
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#serial 26
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#serial 27
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AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD])
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AC_DEFUN([AX_PTHREAD], [
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@ -123,10 +124,12 @@ fi
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# (e.g. DEC) have both -lpthread and -lpthreads, where one of the
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# libraries is broken (non-POSIX).
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# Create a list of thread flags to try. Items starting with a "-" are
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# C compiler flags, and other items are library names, except for "none"
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# which indicates that we try without any flags at all, and "pthread-config"
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# which is a program returning the flags for the Pth emulation library.
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# Create a list of thread flags to try. Items with a "," contain both
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# C compiler flags (before ",") and linker flags (after ","). Other items
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# starting with a "-" are C compiler flags, and remaining items are
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# library names, except for "none" which indicates that we try without
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# any flags at all, and "pthread-config" which is a program returning
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# the flags for the Pth emulation library.
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ax_pthread_flags="pthreads none -Kthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
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@ -194,14 +197,47 @@ case $host_os in
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# that too in a future libc.) So we'll check first for the
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# standard Solaris way of linking pthreads (-mt -lpthread).
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ax_pthread_flags="-mt,pthread pthread $ax_pthread_flags"
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ax_pthread_flags="-mt,-lpthread pthread $ax_pthread_flags"
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;;
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esac
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# Are we compiling with Clang?
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AC_CACHE_CHECK([whether $CC is Clang],
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[ax_cv_PTHREAD_CLANG],
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[ax_cv_PTHREAD_CLANG=no
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# Note that Autoconf sets GCC=yes for Clang as well as GCC
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if test "x$GCC" = "xyes"; then
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AC_EGREP_CPP([AX_PTHREAD_CC_IS_CLANG],
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[/* Note: Clang 2.7 lacks __clang_[a-z]+__ */
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# if defined(__clang__) && defined(__llvm__)
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AX_PTHREAD_CC_IS_CLANG
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# endif
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],
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[ax_cv_PTHREAD_CLANG=yes])
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fi
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])
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ax_pthread_clang="$ax_cv_PTHREAD_CLANG"
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# GCC generally uses -pthread, or -pthreads on some platforms (e.g. SPARC)
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# Note that for GCC and Clang -pthread generally implies -lpthread,
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# except when -nostdlib is passed.
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# This is problematic using libtool to build C++ shared libraries with pthread:
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# [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=25460
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# [2] https://bugzilla.redhat.com/show_bug.cgi?id=661333
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# [3] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=468555
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# To solve this, first try -pthread together with -lpthread for GCC
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AS_IF([test "x$GCC" = "xyes"],
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[ax_pthread_flags="-pthread -pthreads $ax_pthread_flags"])
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[ax_pthread_flags="-pthread,-lpthread -pthread -pthreads $ax_pthread_flags"])
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# Clang takes -pthread (never supported any other flag), but we'll try with -lpthread first
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AS_IF([test "x$ax_pthread_clang" = "xyes"],
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[ax_pthread_flags="-pthread,-lpthread -pthread"])
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# The presence of a feature test macro requesting re-entrant function
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# definitions is, on some systems, a strong hint that pthreads support is
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@ -224,101 +260,6 @@ AS_IF([test "x$ax_pthread_check_macro" = "x--"],
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[ax_pthread_check_cond=0],
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[ax_pthread_check_cond="!defined($ax_pthread_check_macro)"])
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# Are we compiling with Clang?
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AC_CACHE_CHECK([whether $CC is Clang],
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[ax_cv_PTHREAD_CLANG],
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[ax_cv_PTHREAD_CLANG=no
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# Note that Autoconf sets GCC=yes for Clang as well as GCC
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if test "x$GCC" = "xyes"; then
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AC_EGREP_CPP([AX_PTHREAD_CC_IS_CLANG],
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[/* Note: Clang 2.7 lacks __clang_[a-z]+__ */
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# if defined(__clang__) && defined(__llvm__)
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AX_PTHREAD_CC_IS_CLANG
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# endif
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],
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[ax_cv_PTHREAD_CLANG=yes])
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fi
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])
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ax_pthread_clang="$ax_cv_PTHREAD_CLANG"
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ax_pthread_clang_warning=no
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# Clang needs special handling, because older versions handle the -pthread
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# option in a rather... idiosyncratic way
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if test "x$ax_pthread_clang" = "xyes"; then
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# Clang takes -pthread; it has never supported any other flag
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# (Note 1: This will need to be revisited if a system that Clang
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# supports has POSIX threads in a separate library. This tends not
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# to be the way of modern systems, but it's conceivable.)
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# (Note 2: On some systems, notably Darwin, -pthread is not needed
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# to get POSIX threads support; the API is always present and
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# active. We could reasonably leave PTHREAD_CFLAGS empty. But
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# -pthread does define _REENTRANT, and while the Darwin headers
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# ignore this macro, third-party headers might not.)
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PTHREAD_CFLAGS="-pthread"
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PTHREAD_LIBS=
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ax_pthread_ok=yes
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# However, older versions of Clang make a point of warning the user
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# that, in an invocation where only linking and no compilation is
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# taking place, the -pthread option has no effect ("argument unused
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# during compilation"). They expect -pthread to be passed in only
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# when source code is being compiled.
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#
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# Problem is, this is at odds with the way Automake and most other
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# C build frameworks function, which is that the same flags used in
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# compilation (CFLAGS) are also used in linking. Many systems
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# supported by AX_PTHREAD require exactly this for POSIX threads
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# support, and in fact it is often not straightforward to specify a
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# flag that is used only in the compilation phase and not in
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# linking. Such a scenario is extremely rare in practice.
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#
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# Even though use of the -pthread flag in linking would only print
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# a warning, this can be a nuisance for well-run software projects
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# that build with -Werror. So if the active version of Clang has
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# this misfeature, we search for an option to squash it.
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AC_CACHE_CHECK([whether Clang needs flag to prevent "argument unused" warning when linking with -pthread],
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[ax_cv_PTHREAD_CLANG_NO_WARN_FLAG],
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[ax_cv_PTHREAD_CLANG_NO_WARN_FLAG=unknown
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# Create an alternate version of $ac_link that compiles and
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# links in two steps (.c -> .o, .o -> exe) instead of one
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# (.c -> exe), because the warning occurs only in the second
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# step
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ax_pthread_save_ac_link="$ac_link"
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ax_pthread_sed='s/conftest\.\$ac_ext/conftest.$ac_objext/g'
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ax_pthread_link_step=`$as_echo "$ac_link" | sed "$ax_pthread_sed"`
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ax_pthread_2step_ac_link="($ac_compile) && (echo ==== >&5) && ($ax_pthread_link_step)"
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ax_pthread_save_CFLAGS="$CFLAGS"
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for ax_pthread_try in '' -Qunused-arguments -Wno-unused-command-line-argument unknown; do
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AS_IF([test "x$ax_pthread_try" = "xunknown"], [break])
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CFLAGS="-Werror -Wunknown-warning-option $ax_pthread_try -pthread $ax_pthread_save_CFLAGS"
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ac_link="$ax_pthread_save_ac_link"
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AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
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[ac_link="$ax_pthread_2step_ac_link"
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AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
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[break])
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])
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done
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ac_link="$ax_pthread_save_ac_link"
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CFLAGS="$ax_pthread_save_CFLAGS"
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AS_IF([test "x$ax_pthread_try" = "x"], [ax_pthread_try=no])
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ax_cv_PTHREAD_CLANG_NO_WARN_FLAG="$ax_pthread_try"
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])
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case "$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG" in
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no | unknown) ;;
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*) PTHREAD_CFLAGS="$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG $PTHREAD_CFLAGS" ;;
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esac
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fi # $ax_pthread_clang = yes
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if test "x$ax_pthread_ok" = "xno"; then
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for ax_pthread_try_flag in $ax_pthread_flags; do
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@ -328,10 +269,10 @@ for ax_pthread_try_flag in $ax_pthread_flags; do
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AC_MSG_CHECKING([whether pthreads work without any flags])
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;;
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-mt,pthread)
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AC_MSG_CHECKING([whether pthreads work with -mt -lpthread])
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PTHREAD_CFLAGS="-mt"
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PTHREAD_LIBS="-lpthread"
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*,*)
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PTHREAD_CFLAGS=`echo $ax_pthread_try_flag | sed "s/^\(.*\),\(.*\)$/\1/"`
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PTHREAD_LIBS=`echo $ax_pthread_try_flag | sed "s/^\(.*\),\(.*\)$/\2/"`
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AC_MSG_CHECKING([whether pthreads work with "$PTHREAD_CFLAGS" and "$PTHREAD_LIBS"])
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;;
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-*)
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@ -399,6 +340,80 @@ for ax_pthread_try_flag in $ax_pthread_flags; do
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done
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fi
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# Clang needs special handling, because older versions handle the -pthread
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# option in a rather... idiosyncratic way
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if test "x$ax_pthread_clang" = "xyes"; then
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# Clang takes -pthread; it has never supported any other flag
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# (Note 1: This will need to be revisited if a system that Clang
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# supports has POSIX threads in a separate library. This tends not
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# to be the way of modern systems, but it's conceivable.)
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# (Note 2: On some systems, notably Darwin, -pthread is not needed
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# to get POSIX threads support; the API is always present and
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# active. We could reasonably leave PTHREAD_CFLAGS empty. But
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# -pthread does define _REENTRANT, and while the Darwin headers
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# ignore this macro, third-party headers might not.)
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# However, older versions of Clang make a point of warning the user
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# that, in an invocation where only linking and no compilation is
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# taking place, the -pthread option has no effect ("argument unused
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# during compilation"). They expect -pthread to be passed in only
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# when source code is being compiled.
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#
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# Problem is, this is at odds with the way Automake and most other
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# C build frameworks function, which is that the same flags used in
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# compilation (CFLAGS) are also used in linking. Many systems
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# supported by AX_PTHREAD require exactly this for POSIX threads
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# support, and in fact it is often not straightforward to specify a
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# flag that is used only in the compilation phase and not in
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# linking. Such a scenario is extremely rare in practice.
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#
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# Even though use of the -pthread flag in linking would only print
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# a warning, this can be a nuisance for well-run software projects
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# that build with -Werror. So if the active version of Clang has
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# this misfeature, we search for an option to squash it.
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AC_CACHE_CHECK([whether Clang needs flag to prevent "argument unused" warning when linking with -pthread],
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[ax_cv_PTHREAD_CLANG_NO_WARN_FLAG],
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[ax_cv_PTHREAD_CLANG_NO_WARN_FLAG=unknown
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# Create an alternate version of $ac_link that compiles and
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# links in two steps (.c -> .o, .o -> exe) instead of one
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# (.c -> exe), because the warning occurs only in the second
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# step
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ax_pthread_save_ac_link="$ac_link"
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ax_pthread_sed='s/conftest\.\$ac_ext/conftest.$ac_objext/g'
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ax_pthread_link_step=`$as_echo "$ac_link" | sed "$ax_pthread_sed"`
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ax_pthread_2step_ac_link="($ac_compile) && (echo ==== >&5) && ($ax_pthread_link_step)"
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ax_pthread_save_CFLAGS="$CFLAGS"
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for ax_pthread_try in '' -Qunused-arguments -Wno-unused-command-line-argument unknown; do
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AS_IF([test "x$ax_pthread_try" = "xunknown"], [break])
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CFLAGS="-Werror -Wunknown-warning-option $ax_pthread_try -pthread $ax_pthread_save_CFLAGS"
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ac_link="$ax_pthread_save_ac_link"
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AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
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[ac_link="$ax_pthread_2step_ac_link"
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AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
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[break])
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])
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done
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ac_link="$ax_pthread_save_ac_link"
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CFLAGS="$ax_pthread_save_CFLAGS"
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AS_IF([test "x$ax_pthread_try" = "x"], [ax_pthread_try=no])
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ax_cv_PTHREAD_CLANG_NO_WARN_FLAG="$ax_pthread_try"
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])
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case "$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG" in
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no | unknown) ;;
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*) PTHREAD_CFLAGS="$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG $PTHREAD_CFLAGS" ;;
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esac
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fi # $ax_pthread_clang = yes
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# Various other checks:
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if test "x$ax_pthread_ok" = "xyes"; then
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ax_pthread_save_CFLAGS="$CFLAGS"
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