[libstdc++][testsuite] XFAIL tests relying on long double-to-string conversions on broken newlib

    * lib/target-supports.exp
    (check_effective_target_newlib_broken_long_double_io): New check.
    (check_effective_target_frexpl): Likewise.

    * testsuite/21_strings/basic_string/numeric_conversions/char/stod.cc:
    XFAIL run if newlib_broken_long_double_io.
    * testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stod.cc:
    Likewise.
    * testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stold.cc:
    Likewise.
    * testsuite/27_io/basic_ostream/inserters_arithmetic/char/hexfloat.cc:
    Likewise.

From-SVN: r243558

gcc/testsuite/ChangeLog

+2016-12-12  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
+	* lib/target-supports.exp
+	(check_effective_target_newlib_broken_long_double_io): New check.
+	(check_effective_target_frexpl): Likewise.
+
 2016-12-12  Marek Polacek  <polacek@redhat.com>
 
 	PR middle-end/78716

gcc/testsuite/lib/target-supports.exp

@@ -6765,6 +6765,17 @@ proc check_effective_target_newlib {} {
     }]
 }
 
+# Some newlib versions don't provide a frexpl and instead depend
+# on frexp to implement long double conversions in their printf-like
+# functions.  This leads to broken results.  Detect such versions here.
+
+proc check_effective_target_newlib_broken_long_double_io {} {
+  if { [is-effective-target newlib] && ![is-effective-target frexpl] } {
+	return 1
+  }
+  return 0
+}
+
 # Return true if this is NOT a Bionic target.
 
 proc check_effective_target_non_bionic {} {
@@ -7380,6 +7391,21 @@ proc check_effective_target_pow10 { } {
     } "-lm" ]
 }
 
+# Return 1 if frexpl function exists.
+
+proc check_effective_target_frexpl { } {
+    return [check_runtime frexpl {
+	#include <math.h>
+	int main () {
+	long double x;
+	int y;
+	x = frexpl (5.0, &y);
+	return 0;
+	}
+    } "-lm" ]
+}
+
+
 # Return 1 if issignaling function exists.
 proc check_effective_target_issignaling {} {
     return [check_runtime issignaling {

libstdc++-v3/ChangeLog

+2016-12-12  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
+	* testsuite/21_strings/basic_string/numeric_conversions/char/stod.cc:
+	XFAIL run if newlib_broken_long_double_io.
+	* testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stod.cc:
+	Likewise.
+	* testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stold.cc:
+	Likewise.
+	* testsuite/27_io/basic_ostream/inserters_arithmetic/char/hexfloat.cc:
+	Likewise.
+
 2016-12-12  Jonathan Wakely  <jwakely@redhat.com>
 
 	* testsuite/experimental/filesystem/operations/is_empty.cc:

libstdc++-v3/testsuite/21_strings/basic_string/numeric_conversions/char/stod.cc

 // { dg-do run { target c++11 } }
 // { dg-require-string-conversions "" }
+// { dg-xfail-run-if "broken long double IO" { newlib_broken_long_double_io  }  "*" "" }
 
 // 2008-06-15  Paolo Carlini  <paolo.carlini@oracle.com>
 

libstdc++-v3/testsuite/21_strings/basic_string/numeric_conversions/char/stold.cc

 // { dg-do run { target c++11 } }
 // { dg-require-string-conversions "" }
+// { dg-xfail-run-if "broken long double IO" { newlib_broken_long_double_io  }  "*" "" }
 
 // 2008-06-15  Paolo Carlini  <paolo.carlini@oracle.com>
 

libstdc++-v3/testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stod.cc

 // { dg-do run { target c++11 } }
 // { dg-require-string-conversions "" }
+// { dg-xfail-run-if "broken long double IO" { newlib_broken_long_double_io  }  "*" "" }
+
 // 2008-06-15  Paolo Carlini  <paolo.carlini@oracle.com>
 
 // Copyright (C) 2008-2016 Free Software Foundation, Inc.

libstdc++-v3/testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stold.cc

 // { dg-do run { target c++11 } }
 // { dg-require-string-conversions "" }
+// { dg-xfail-run-if "broken long double IO" { newlib_broken_long_double_io  }  "*" "" }
+
 // 2008-06-15  Paolo Carlini  <paolo.carlini@oracle.com>
 
 // Copyright (C) 2008-2016 Free Software Foundation, Inc.

libstdc++-v3/testsuite/27_io/basic_ostream/inserters_arithmetic/char/hexfloat.cc

 // { dg-do run { target c++11 } }
 // { dg-require-string-conversions "" }
 // { dg-xfail-run-if "PR libstdc++/64054" { *-*-solaris* } }
+// { dg-xfail-run-if "broken long double IO" { newlib_broken_long_double_io  }  "*" "" }
 
 // 2014-03-27 Rüdiger Sonderfeld
 // test the hexadecimal floating point inserters (facet num_put)