libstdc++-v3: enable std::thread for zephyr via posix

configure

@@ -2877,6 +2877,14 @@ else
   is_cross_compiler=yes
 fi
 
+# required for gthr-posix.h support in Zephyr
+case "${target}" in
+  *zephyr*)
+    CFLAGS="$CFLAGS -include `realpath $srcdir/libgcc/zephyr-bits.h`"
+    CXXFLAGS="$CXXFLAGS -include `realpath $srcdir/libgcc/zephyr-bits.h`"
+    ;;
+esac
+
 # Find the build and target subdir names.
 
 # post-stage1 host modules use a different CC_FOR_BUILD so, in order to

configure.ac

@@ -211,6 +211,14 @@ else
   is_cross_compiler=yes
 fi	
 
+# required for gthr-posix.h support in Zephyr
+case "${target}" in
+  *zephyr*)
+    CFLAGS="$CFLAGS -include `realpath $srcdir/libgcc/zephyr-bits.h`"
+    CXXFLAGS="$CXXFLAGS -include `realpath $srcdir/libgcc/zephyr-bits.h`"
+    ;;
+esac
+
 # Find the build and target subdir names.
 GCC_TOPLEV_SUBDIRS
 # Be sure to cover against remnants of an in-tree build.

libgcc/zephyr-bits.h

@@ -0,0 +1,13 @@
+#ifndef LIBGCC_ZEPHYR_BITS_H_
+#define LIBGCC_ZEPHYR_BITS_H_
+
+#define _POSIX_THREADS 200809L
+#define _POSIX_TIMERS 200809L
+#define _POSIX_MONOTONIC_CLOCK 200809L
+#define _UNIX98_THREAD_MUTEX_ATTRIBUTES 1
+
+#define _PTHREAD_MUTEX_INITIALIZER (-1)
+#define _PTHREAD_COND_INITIALIZER (-1)
+#define _PTHREAD_ONCE_INIT {1,0}
+
+#endif /* LIBGCC_ZEPHYR_BITS_H_ */

libstdc++-v3/acinclude.m4

@@ -1345,6 +1345,8 @@ AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_TIME], [
   ac_has_clock_realtime=no
   ac_has_nanosleep=no
   ac_has_sched_yield=no
+  ac_has_sleep=no
+  ac_has_usleep=no
 
   if test x"$enable_libstdcxx_time" = x"auto"; then
 
@@ -1396,6 +1398,17 @@ AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_TIME], [
         ac_has_sched_yield=yes
     esac
 
+    case "${target}" in
+      *zephyr*)
+        ac_has_clock_monotonic=yes
+        ac_has_clock_realtime=yes
+        ac_has_nanosleep=yes
+        ac_has_sched_yield=yes
+        ac_has_sleep=yes
+        ac_has_usleep=yes
+        ;;
+    esac
+
   elif test x"$enable_libstdcxx_time" != x"no"; then
 
     if test x"$enable_libstdcxx_time" = x"rt"; then
@@ -1589,21 +1602,38 @@ AC_DEFUN([GLIBCXX_CHECK_GETTIMEOFDAY], [
 
   AC_MSG_CHECKING([for gettimeofday])
 
+  runtests=yes
+  ac_has_gettimeofday=no
+  ac_has_sys_time_h=no
+
+  case "${target}" in
+    *zephyr*)
+      runtests=no
+      ac_has_gettimeofday=yes
+      ac_has_sys_time_h=yes
+      ;;
+  esac
+
   AC_LANG_SAVE
   AC_LANG_CPLUSPLUS
   ac_save_CXXFLAGS="$CXXFLAGS"
   CXXFLAGS="$CXXFLAGS -fno-exceptions"
 
-  ac_has_gettimeofday=no;
+  if test x"$runtests" = x"yes"; then
   AC_CHECK_HEADERS(sys/time.h, ac_has_sys_time_h=yes, ac_has_sys_time_h=no)
+  fi
+
   if test x"$ac_has_sys_time_h" = x"yes"; then
     AC_MSG_CHECKING([for gettimeofday])
+    if test x"$runtests" = x"yes"; then
     GCC_TRY_COMPILE_OR_LINK([#include <sys/time.h>],
       [timeval tv; gettimeofday(&tv, 0);],
       [ac_has_gettimeofday=yes], [ac_has_gettimeofday=no])
+    fi
 
     AC_MSG_RESULT($ac_has_gettimeofday)
   fi
+  fi
 
   if test x"$ac_has_gettimeofday" = x"yes"; then
     AC_DEFINE(_GLIBCXX_USE_GETTIMEOFDAY, 1,
@@ -3964,6 +3994,24 @@ dnl
 AC_DEFUN([GLIBCXX_CHECK_GTHREADS], [
   GLIBCXX_ENABLE(libstdcxx-threads,auto,,[enable C++11 threads support])
 
+  runtests=yes
+  ac_gthread_use_mutex_timedlock=no
+  ac_has_gthreads=no
+  ac_gthread_use_pthreads=no
+  ac_have_posix_semaphore=no
+  ac_gthread_use_pthreads_rwlock_t=no
+
+  case "${target}" in
+  *zephyr*)
+    runtests=no
+    ac_gthread_use_mutex_timedlock=yes
+    ac_has_gthreads=yes
+    ac_gthread_use_pthreads=yes
+    ac_have_posix_semaphore=yes
+    ac_gthread_use_pthreads_rwlock_t=yes
+    ;;
+  esac
+
   if test x$enable_libstdcxx_threads = xauto ||
      test x$enable_libstdcxx_threads = xyes; then
 
@@ -3982,6 +4030,7 @@ AC_DEFUN([GLIBCXX_CHECK_GTHREADS], [
 
   AC_MSG_CHECKING([whether it can be safely assumed that mutex_timedlock is available])
 
+  if x"$runtests" = x"yes"; then
   AC_TRY_COMPILE([#include <unistd.h>],
     [
       // In case of POSIX threads check _POSIX_TIMEOUTS.
@@ -3990,6 +4039,7 @@ AC_DEFUN([GLIBCXX_CHECK_GTHREADS], [
       #error
       #endif
     ], [ac_gthread_use_mutex_timedlock=1], [ac_gthread_use_mutex_timedlock=0])
+  fi
 
   AC_DEFINE_UNQUOTED(_GTHREAD_USE_MUTEX_TIMEDLOCK, $ac_gthread_use_mutex_timedlock,
 		     [Define to 1 if mutex_timedlock is available.])
@@ -4000,6 +4050,7 @@ AC_DEFUN([GLIBCXX_CHECK_GTHREADS], [
 
   AC_MSG_CHECKING([for gthreads library])
 
+  if x"$runtests" = x"yes"; then
   AC_TRY_COMPILE([#include "gthr.h"],
     [
       #ifndef __GTHREADS_CXX0X
@@ -4009,6 +4060,7 @@ AC_DEFUN([GLIBCXX_CHECK_GTHREADS], [
   else
     ac_has_gthreads=no
   fi
+  fi
 
   AC_MSG_RESULT([$ac_has_gthreads])
 
@@ -4021,21 +4073,31 @@ AC_DEFUN([GLIBCXX_CHECK_GTHREADS], [
     # On VxWorks for example, pthread_rwlock_t is defined in sys/types.h
     # but the pthread library is not there by default and the gthread library
     # does not use it.
+    if x"$runtests" = x"yes"; then
     AC_TRY_COMPILE([#include "gthr.h"],
     [
       #if (!defined(_PTHREADS))
       #error
       #endif
     ], [ac_gthread_use_pthreads=yes], [ac_gthread_use_pthreads=no])
+    fi
     if test x"$ac_gthread_use_pthreads" = x"yes"; then
+      if x"$runtests" = x"yes"; then
       AC_CHECK_TYPE([pthread_rwlock_t],
              [AC_DEFINE([_GLIBCXX_USE_PTHREAD_RWLOCK_T], 1,
              [Define if POSIX read/write locks are available in <gthr.h>.])],
              [],
              [#include "gthr.h"])
+      else
+        if x"$ac_gthread_use_pthreads_rwlock_t" = x"yes"; then
+          AC_DEFINE([_GLIBCXX_USE_PTHREAD_RWLOCK_T], 1,
+            [Define if POSIX read/write locks are available in <gthr.h>.])
+        fi
+      fi
     fi
   fi
 
+  if x"$runtests" = x"yes"; then
   AC_CHECK_HEADER(semaphore.h, [
     AC_MSG_CHECKING([for POSIX Semaphores and sem_timedwait])
     AC_TRY_COMPILE([
@@ -4065,6 +4127,7 @@ AC_DEFUN([GLIBCXX_CHECK_GTHREADS], [
       [ac_have_posix_semaphore=yes],
       [ac_have_posix_semaphore=no])],
       [ac_have_posix_semaphore=no])
+  fi
 
   if test $ac_have_posix_semaphore = yes ; then
     AC_DEFINE(HAVE_POSIX_SEMAPHORE,

libstdc++-v3/configure

@@ -20396,6 +20396,17 @@ fi
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for gettimeofday" >&5
 $as_echo_n "checking for gettimeofday... " >&6; }
 
+  runtests=yes
+  ac_has_gettimeofday=no
+  ac_has_sys_time_h=no
+
+  case "${target}" in
+    *zephyr*)
+      runtests=no
+      ac_has_gettimeofday=yes
+      ac_has_sys_time_h=yes
+      ;;
+  esac
 
   ac_ext=cpp
 ac_cpp='$CXXCPP $CPPFLAGS'
@@ -20406,7 +20417,7 @@ ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
   ac_save_CXXFLAGS="$CXXFLAGS"
   CXXFLAGS="$CXXFLAGS -fno-exceptions"
 
-  ac_has_gettimeofday=no;
+  if test x"$runtests" = x"yes"; then
   for ac_header in sys/time.h
 do :
   ac_fn_cxx_check_header_mongrel "$LINENO" "sys/time.h" "ac_cv_header_sys_time_h" "$ac_includes_default"
@@ -20420,10 +20431,12 @@ else
 fi
 
 done
+fi
 
   if test x"$ac_has_sys_time_h" = x"yes"; then
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking for gettimeofday" >&5
 $as_echo_n "checking for gettimeofday... " >&6; }
+    if test x"$runtests" = x"yes"; then
     if test x$gcc_no_link = xyes; then
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
@@ -20464,11 +20477,12 @@ else
 fi
 rm -f core conftest.err conftest.$ac_objext \
     conftest$ac_exeext conftest.$ac_ext
+fi
+fi
 fi
 
     { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_has_gettimeofday" >&5
 $as_echo "$ac_has_gettimeofday" >&6; }
-  fi
 
   if test x"$ac_has_gettimeofday" = x"yes"; then
 
@@ -20517,6 +20531,8 @@ ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
   ac_has_clock_realtime=no
   ac_has_nanosleep=no
   ac_has_sched_yield=no
+  ac_has_sleep=no
+  ac_has_usleep=no
 
   if test x"$enable_libstdcxx_time" = x"auto"; then
 
@@ -20626,6 +20642,17 @@ fi
         ac_has_sched_yield=yes
     esac
 
+    case "${target}" in
+      *zephyr*)
+        ac_has_clock_monotonic=yes
+        ac_has_clock_realtime=yes
+        ac_has_nanosleep=yes
+        ac_has_sched_yield=yes
+        ac_has_sleep=yes
+        ac_has_usleep=yes
+        ;;
+    esac
+
   elif test x"$enable_libstdcxx_time" != x"no"; then
 
     if test x"$enable_libstdcxx_time" = x"rt"; then
@@ -76041,6 +76068,23 @@ else
 fi
 
 
+  runtests=yes
+  ac_gthread_use_mutex_timedlock=no
+  ac_has_gthreads=no
+  ac_gthread_use_pthreads=no
+  ac_have_posix_semaphore=no
+  ac_gthread_use_pthreads_rwlock_t=no
+
+  case "${target}" in
+  *zephyr*)
+    runtests=no
+    ac_gthread_use_mutex_timedlock=yes
+    ac_has_gthreads=yes
+    ac_gthread_use_pthreads=yes
+    ac_have_posix_semaphore=yes
+    ac_gthread_use_pthreads_rwlock_t=yes
+    ;;
+  esac
 
   if test x$enable_libstdcxx_threads = xauto ||
      test x$enable_libstdcxx_threads = xyes; then
@@ -76066,6 +76110,7 @@ ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether it can be safely assumed that mutex_timedlock is available" >&5
 $as_echo_n "checking whether it can be safely assumed that mutex_timedlock is available... " >&6; }
 
+  if x"$runtests" = x"yes"; then
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #include <unistd.h>
@@ -76089,6 +76134,7 @@ else
   ac_gthread_use_mutex_timedlock=0
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
 
 
 cat >>confdefs.h <<_ACEOF
@@ -76104,6 +76150,7 @@ $as_echo "$res_mutex_timedlock" >&6; }
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for gthreads library" >&5
 $as_echo_n "checking for gthreads library... " >&6; }
 
+  if x"$runtests" = x"yes"; then
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #include "gthr.h"
@@ -76128,6 +76175,7 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
   else
     ac_has_gthreads=no
   fi
+  fi
 
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_has_gthreads" >&5
 $as_echo "$ac_has_gthreads" >&6; }
@@ -76142,6 +76190,7 @@ $as_echo "#define _GLIBCXX_HAS_GTHREADS 1" >>confdefs.h
     # On VxWorks for example, pthread_rwlock_t is defined in sys/types.h
     # but the pthread library is not there by default and the gthread library
     # does not use it.
+    if x"$runtests" = x"yes"; then
     cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #include "gthr.h"
@@ -76163,18 +76212,27 @@ else
   ac_gthread_use_pthreads=no
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+    fi
     if test x"$ac_gthread_use_pthreads" = x"yes"; then
+      if x"$runtests" = x"yes"; then
       ac_fn_cxx_check_type "$LINENO" "pthread_rwlock_t" "ac_cv_type_pthread_rwlock_t" "#include \"gthr.h\"
 "
 if test "x$ac_cv_type_pthread_rwlock_t" = xyes; then :
 
 $as_echo "#define _GLIBCXX_USE_PTHREAD_RWLOCK_T 1" >>confdefs.h
 
 fi
+      else
+if test "x$ac_cv_type_pthread_rwlock_t" = xyes; then :
+
+$as_echo "#define _GLIBCXX_USE_PTHREAD_RWLOCK_T 1" >>confdefs.h
 
+fi
+      fi
     fi
   fi
 
+  if x"$runtests" = x"yes"; then
   ac_fn_cxx_check_header_mongrel "$LINENO" "semaphore.h" "ac_cv_header_semaphore_h" "$ac_includes_default"
 if test "x$ac_cv_header_semaphore_h" = xyes; then :
 
@@ -76222,6 +76280,7 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 else
   ac_have_posix_semaphore=no
 fi
+fi