PR c++/81852 define feature-test macro for -fthreadsafe-statics

gcc/c-family:

	PR c++/81852
	* c-cppbuiltin.c (c_cpp_builtins): Define __cpp_threadsafe_static_init.

gcc/testsuite:

	PR c++/81852
	* g++.dg/cpp1y/feat-cxx11.C: Check __cpp_threadsafe_static_init.
	* g++.dg/cpp1y/feat-cxx14.C: Likewise.
	* g++.dg/cpp1y/feat-cxx98.C: Likewise.
	* g++.dg/cpp1y/feat-neg.C: Likewise.
	* g++.dg/cpp1z/feat-cxx1z.C: Likewise.

From-SVN: r251939

gcc/c-family/ChangeLog

+2017-09-09  Jonathan Wakely  <jwakely@redhat.com>
+
+	PR c++/81852
+	* c-cppbuiltin.c (c_cpp_builtins): Define __cpp_threadsafe_static_init.
+
 2017-09-04  Marek Polacek  <polacek@redhat.com>
 
 	PR c/81783

gcc/c-family/c-cppbuiltin.c

@@ -987,6 +987,8 @@ c_cpp_builtins (cpp_reader *pfile)
 	}
       if (flag_new_ttp)
 	cpp_define (pfile, "__cpp_template_template_args=201611");
+      if (flag_threadsafe_statics)
+	cpp_define (pfile, "__cpp_threadsafe_static_init=200806");
     }
   /* Note that we define this for C as well, so that we know if
      __attribute__((cleanup)) will interface with EH.  */

gcc/testsuite/ChangeLog

+2017-09-09  Jonathan Wakely  <jwakely@redhat.com>
+
+	PR c++/81852
+	* g++.dg/cpp1y/feat-cxx11.C: Check __cpp_threadsafe_static_init.
+	* g++.dg/cpp1y/feat-cxx14.C: Likewise.
+	* g++.dg/cpp1y/feat-cxx98.C: Likewise.
+	* g++.dg/cpp1y/feat-neg.C: Likewise.
+	* g++.dg/cpp1z/feat-cxx1z.C: Likewise.
+
 2017-09-09  Pierre-Marie de Rodat  <derodat@adacore.com>
 
 	* gnat.dg/debug14.adb: New test.

gcc/testsuite/g++.dg/cpp1y/feat-cxx11.C

@@ -125,6 +125,12 @@
 #  error "__cpp_alias_templates != 200704"
 #endif
 
+#ifndef __cpp_threadsafe_static_init
+#  error "__cpp_threadsafe_static_init"
+#elif __cpp_threadsafe_static_init != 200806
+#  error "__cpp_threadsafe_static_init != 200806"
+#endif
+
 //  C++14 features allowed in C++11 in non-ANSI modes:
 
 #ifndef __cpp_binary_literals

gcc/testsuite/g++.dg/cpp1y/feat-cxx14.C

@@ -118,6 +118,12 @@
 #  error "__cpp_alias_templates != 200704"
 #endif
 
+#ifndef __cpp_threadsafe_static_init
+#  error "__cpp_threadsafe_static_init"
+#elif __cpp_threadsafe_static_init != 200806
+#  error "__cpp_threadsafe_static_init != 200806"
+#endif
+
 //  C++14 features:
 
 #ifndef __cpp_binary_literals

gcc/testsuite/g++.dg/cpp1y/feat-cxx98.C

@@ -15,6 +15,14 @@
 #  error "__cpp_exceptions != 199711"
 #endif
 
+//  C++11 features allowed in C++98:
+
+#ifndef __cpp_threadsafe_static_init
+#  error "__cpp_threadsafe_static_init"
+#elif __cpp_threadsafe_static_init != 200806
+#  error "__cpp_threadsafe_static_init != 200806"
+#endif
+
 //  C++14 features allowed in C++98 in non-ANSI modes:
 
 #ifndef __cpp_binary_literals

gcc/testsuite/g++.dg/cpp1y/feat-neg.C

 // { dg-do compile }
-// { dg-options "-fno-rtti -fno-exceptions" }
+// { dg-options "-fno-rtti -fno-exceptions -fno-threadsafe-statics" }
 
 //  C++98 features with explicit opt-out:
 
@@ -10,3 +10,9 @@
 #ifndef __cpp_exceptions
 #  error "__cpp_exceptions" // { dg-error "error" }
 #endif
+
+//  C++11 features with explicit opt-out:
+
+#ifndef __cpp_threadsafe_static_init
+#  error "__cpp_threadsafe_static_init" // { dg-error "error" }
+#endif

gcc/testsuite/g++.dg/cpp1z/feat-cxx1z.C

@@ -106,6 +106,12 @@
 #  error "__cpp_alias_templates != 200704"
 #endif
 
+#ifndef __cpp_threadsafe_static_init
+#  error "__cpp_threadsafe_static_init"
+#elif __cpp_threadsafe_static_init != 200806
+#  error "__cpp_threadsafe_static_init != 200806"
+#endif
+
 //  C++14 features:
 
 #ifndef __cpp_binary_literals