Test -lrt for sched_yield

Apparently, this is needed in some Solaris versions.

Author: Oskari Saarenmaa

Author: alvherre

configure

@@ -8512,6 +8512,94 @@ if test "$ac_res" != no; then
 
 fi
 
+# Required for thread_test.c on Solaris
+{ $as_echo "$as_me:$LINENO: checking for library containing sched_yield" >&5
+$as_echo_n "checking for library containing sched_yield... " >&6; }
+if test "${ac_cv_search_sched_yield+set}" = set; then
+  $as_echo_n "(cached) " >&6
+else
+  ac_func_search_save_LIBS=$LIBS
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char sched_yield ();
+int
+main ()
+{
+return sched_yield ();
+  ;
+  return 0;
+}
+_ACEOF
+for ac_lib in '' rt; do
+  if test -z "$ac_lib"; then
+    ac_res="none required"
+  else
+    ac_res=-l$ac_lib
+    LIBS="-l$ac_lib  $ac_func_search_save_LIBS"
+  fi
+  rm -f conftest.$ac_objext conftest$ac_exeext
+if { (ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
+$as_echo "$ac_try_echo") >&5
+  (eval "$ac_link") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest$ac_exeext && {
+	 test "$cross_compiling" = yes ||
+	 $as_test_x conftest$ac_exeext
+       }; then
+  ac_cv_search_sched_yield=$ac_res
+else
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+
+fi
+
+rm -rf conftest.dSYM
+rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
+      conftest$ac_exeext
+  if test "${ac_cv_search_sched_yield+set}" = set; then
+  break
+fi
+done
+if test "${ac_cv_search_sched_yield+set}" = set; then
+  :
+else
+  ac_cv_search_sched_yield=no
+fi
+rm conftest.$ac_ext
+LIBS=$ac_func_search_save_LIBS
+fi
+{ $as_echo "$as_me:$LINENO: result: $ac_cv_search_sched_yield" >&5
+$as_echo "$ac_cv_search_sched_yield" >&6; }
+ac_res=$ac_cv_search_sched_yield
+if test "$ac_res" != no; then
+  test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
+
+fi
+
 # Required for thread_test.c on Solaris 2.5:
 # Other ports use it too (HP-UX) so test unconditionally
 { $as_echo "$as_me:$LINENO: checking for library containing gethostbyname_r" >&5

configure.in

@@ -892,6 +892,8 @@ AC_SEARCH_LIBS(getopt_long, [getopt gnugetopt])
 AC_SEARCH_LIBS(crypt, crypt)
 # Solaris:
 AC_SEARCH_LIBS(fdatasync, [rt posix4])
+# Required for thread_test.c on Solaris
+AC_SEARCH_LIBS(sched_yield, rt)
 # Required for thread_test.c on Solaris 2.5:
 # Other ports use it too (HP-UX) so test unconditionally
 AC_SEARCH_LIBS(gethostbyname_r, nsl)