libstdc++-v3 Skip tests on Darwin8-10.

These earlier Darwin versions have “FP_≈” inside a
comment in architecture/{ppc,i386}/math.h, which is
included by math.h which causes the tests to fail.

The intent of the tests (i.e. to ensure that the
library itself does not emit non-ascii) is covered
by other platforms, including later Darwin editions.

2019-04-21  Iain Sandoe  <iain@sandoe.co.uk>

	* testsuite/17_intro/headers/c++1998/charset.cc: Skip for Darwin8
	to Darwin10.
	* testsuite/17_intro/headers/c++2011/charset.cc: Likewise.
	* testsuite/17_intro/headers/c++2014/charset.cc: Likewise.
	* testsuite/17_intro/headers/c++2017/charset.cc: Likewise.
	* testsuite/17_intro/headers/c++2020/charset.cc: Likewise.

From-SVN: r270479

libstdc++-v3/ChangeLog

+2019-04-21  Iain Sandoe  <iain@sandoe.co.uk>
+
+	* testsuite/17_intro/headers/c++1998/charset.cc: Skip for Darwin8
+	to Darwin10.
+	* testsuite/17_intro/headers/c++2011/charset.cc: Likewise.
+	* testsuite/17_intro/headers/c++2014/charset.cc: Likewise.
+	* testsuite/17_intro/headers/c++2017/charset.cc: Likewise.
+	* testsuite/17_intro/headers/c++2020/charset.cc: Likewise.
+
 2019-04-20  Thomas Rodgers <trodgers@redhat.com>
 
 	Delegate PSTL configuration to pstl/pstl_config.h

libstdc++-v3/testsuite/17_intro/headers/c++1998/charset.cc

 // { dg-options "-finput-charset=ascii" }
 // { dg-do compile }
+// { dg-skip-if "non-ascii in system headers" { *-*-darwin10*  *-*-darwin[89]* } }
 
 #include <bits/extc++.h>

libstdc++-v3/testsuite/17_intro/headers/c++2011/charset.cc

 // { dg-options "-finput-charset=ascii" }
 // { dg-do compile }
+// { dg-skip-if "non-ascii in system headers" { *-*-darwin10*  *-*-darwin[89]* } }
 
 #include <bits/extc++.h>

libstdc++-v3/testsuite/17_intro/headers/c++2014/charset.cc

 // { dg-options "-finput-charset=ascii" }
 // { dg-do compile }
+// { dg-skip-if "non-ascii in system headers" { *-*-darwin10*  *-*-darwin[89]* } }
 
 #include <bits/extc++.h>

libstdc++-v3/testsuite/17_intro/headers/c++2017/charset.cc

 // { dg-options "-finput-charset=ascii" }
 // { dg-do compile }
+// { dg-skip-if "non-ascii in system headers" { *-*-darwin10*  *-*-darwin[89]* } }
 
 #include <bits/extc++.h>

libstdc++-v3/testsuite/17_intro/headers/c++2020/charset.cc

 // { dg-options "-finput-charset=ascii" }
 // { dg-do compile }
+// { dg-skip-if "non-ascii in system headers" { *-*-darwin10*  *-*-darwin[89]* } }
 
 #include <bits/extc++.h>