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

Add zephyr-specific hints for GLIBCXX_ENABLE_LIBSTDCXX_TIME().

Signed-off-by: Chris Friedt <[email protected]>

libstdc++-v3/acinclude.m4

@@ -1394,6 +1394,14 @@ AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_TIME], [
       uclinux*)
         ac_has_nanosleep=yes
         ac_has_sched_yield=yes
+      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
@@ -1589,12 +1597,21 @@ AC_DEFUN([GLIBCXX_CHECK_GETTIMEOFDAY], [
 
   AC_MSG_CHECKING([for gettimeofday])
 
+  case "${target_os}" in
+    zephyr*)
+      ac_has_gettimeofday=yes
+      ;;
+    *)
+      ac_has_gettimeofday=no
+      ;;
+  esac
+
+  if test x"$ac_has_gettimeofday" != x"yes"; then
   AC_LANG_SAVE
   AC_LANG_CPLUSPLUS
   ac_save_CXXFLAGS="$CXXFLAGS"
   CXXFLAGS="$CXXFLAGS -fno-exceptions"
 
-  ac_has_gettimeofday=no;
   AC_CHECK_HEADERS(sys/time.h, ac_has_sys_time_h=yes, ac_has_sys_time_h=no)
   if test x"$ac_has_sys_time_h" = x"yes"; then
     AC_MSG_CHECKING([for gettimeofday])
@@ -1604,6 +1621,7 @@ AC_DEFUN([GLIBCXX_CHECK_GETTIMEOFDAY], [
 
     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 +3982,17 @@ dnl
 AC_DEFUN([GLIBCXX_CHECK_GTHREADS], [
   GLIBCXX_ENABLE(libstdcxx-threads,auto,,[enable C++11 threads support])
 
+  case "${target_os}" in
+  zephyr*)
+    # do not attempt to run compile or link tests
+    notest=yes
+    ac_gthread_use_mutex_timedlock=yes
+    ac_has_gthreads=yes
+    ac_gthread_use_pthreads=yes
+    ac_have_posix_semaphore=yes
+    ;;
+  esac
+
   if test x$enable_libstdcxx_threads = xauto ||
      test x$enable_libstdcxx_threads = xyes; then
 
@@ -3982,6 +4011,7 @@ AC_DEFUN([GLIBCXX_CHECK_GTHREADS], [
 
   AC_MSG_CHECKING([whether it can be safely assumed that mutex_timedlock is available])
 
+  if test x"$notest" != x"yes"; then
   AC_TRY_COMPILE([#include <unistd.h>],
     [
       // In case of POSIX threads check _POSIX_TIMEOUTS.
@@ -3990,6 +4020,7 @@ 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 +4031,7 @@ AC_DEFUN([GLIBCXX_CHECK_GTHREADS], [
 
   AC_MSG_CHECKING([for gthreads library])
 
+  if test x"$notest" != x"yes"; then
   AC_TRY_COMPILE([#include "gthr.h"],
     [
       #ifndef __GTHREADS_CXX0X
@@ -4009,6 +4041,7 @@ AC_DEFUN([GLIBCXX_CHECK_GTHREADS], [
   else
     ac_has_gthreads=no
   fi
+  fi
 
   AC_MSG_RESULT([$ac_has_gthreads])
 
@@ -4021,6 +4054,7 @@ 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 test x"$notest" != x"yes"; then
     AC_TRY_COMPILE([#include "gthr.h"],
     [
       #if (!defined(_PTHREADS))
@@ -4034,8 +4068,14 @@ AC_DEFUN([GLIBCXX_CHECK_GTHREADS], [
              [],
              [#include "gthr.h"])
     fi
+    else
+    if test x"$ac_gthread_use_pthreads" = x"yes"; then
+             AC_DEFINE([_GLIBCXX_USE_PTHREAD_RWLOCK_T], 1,
+             [Define if POSIX read/write locks are available in <gthr.h>.])
+    fi
   fi
 
+  if test x"$notest" != x"yes"; then
   AC_CHECK_HEADER(semaphore.h, [
     AC_MSG_CHECKING([for POSIX Semaphores and sem_timedwait])
     AC_TRY_COMPILE([
@@ -4065,6 +4105,7 @@ 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,