Add workaround for non-unique errno values on AIX

	* src/c++11/system_error.cc
	(system_error_category::default_error_condition): Add workaround for
	ENOTEMPTY and EEXIST having the same value on AIX.
	* testsuite/19_diagnostics/error_category/system_category.cc: Add
	extra testcases for EDOM, EILSEQ, ERANGE, EEXIST and ENOTEMPTY.

From-SVN: r263289

libstdc++-v3/ChangeLog

+2018-08-03  Jonathan Wakely  <jwakely@redhat.com>
+
+	* src/c++11/system_error.cc
+	(system_error_category::default_error_condition): Add workaround for
+	ENOTEMPTY and EEXIST having the same value on AIX.
+	* testsuite/19_diagnostics/error_category/system_category.cc: Add
+	extra testcases for EDOM, EILSEQ, ERANGE, EEXIST and ENOTEMPTY.
+
 2018-08-01  Jonathan Wakely  <jwakely@redhat.com>
 
 	* configure: Regenerate.

libstdc++-v3/src/c++11/system_error.cc

@@ -241,7 +241,8 @@ namespace
 #ifdef ENOTDIR
       case ENOTDIR:
 #endif
-#ifdef ENOTEMPTY
+#if defined ENOTEMPTY && (!defined EEXIST || ENOTEMPTY != EEXIST)
+      // AIX sometimes uses the same value for EEXIST and ENOTEMPTY
       case ENOTEMPTY:
 #endif
 #ifdef ENOTRECOVERABLE

libstdc++-v3/testsuite/19_diagnostics/error_category/system_category.cc

@@ -34,6 +34,22 @@ test02()
   const std::error_category& cat = std::system_category();
   std::error_condition cond;
 
+  // As of 2011, ISO C only defines EDOM, EILSEQ and ERANGE:
+  cond = cat.default_error_condition(EDOM);
+  VERIFY( cond.value() == EDOM );
+  VERIFY( cond == std::errc::argument_out_of_domain );
+  VERIFY( cond.category() == std::generic_category() );
+  cond = cat.default_error_condition(EILSEQ);
+  VERIFY( cond.value() == EILSEQ );
+  VERIFY( cond == std::errc::illegal_byte_sequence );
+  VERIFY( cond.category() == std::generic_category() );
+  cond = cat.default_error_condition(ERANGE);
+  VERIFY( cond.value() == ERANGE );
+  VERIFY( cond == std::errc::result_out_of_range );
+  VERIFY( cond.category() == std::generic_category() );
+
+  // EBADF and EACCES are defined on all targets,
+  // according to config/os/*/error_constants.h
   cond = cat.default_error_condition(EBADF);
   VERIFY( cond.value() == EBADF );
   VERIFY( cond == std::errc::bad_file_descriptor );
@@ -52,8 +68,29 @@ test02()
   VERIFY( cond.category() == cat );
 
   // PR libstdc++/60555
+  VERIFY( std::error_code(EDOM, cat) == std::errc::argument_out_of_domain );
+  VERIFY( std::error_code(EILSEQ, cat) == std::errc::illegal_byte_sequence );
+  VERIFY( std::error_code(ERANGE, cat) == std::errc::result_out_of_range );
   VERIFY( std::error_code(EBADF, cat) == std::errc::bad_file_descriptor );
   VERIFY( std::error_code(EACCES, cat) == std::errc::permission_denied );
+
+  // As shown at https://gcc.gnu.org/ml/libstdc++/2018-08/msg00018.html
+  // these two error codes might have the same value on AIX, but we still
+  // expect both to be matched by system_category and so use generic_category:
+#ifdef EEXIST
+  cond = cat.default_error_condition(EEXIST);
+  VERIFY( cond.value() == EEXIST );
+  VERIFY( cond == std::errc::file_exists );
+  VERIFY( cond.category() == std::generic_category() );
+  VERIFY( std::error_code(EEXIST, cat) == std::errc::file_exists );
+#endif
+#ifdef ENOTEMPTY
+  cond = cat.default_error_condition(ENOTEMPTY);
+  VERIFY( cond.value() == ENOTEMPTY );
+  VERIFY( cond == std::errc::directory_not_empty );
+  VERIFY( cond.category() == std::generic_category() );
+  VERIFY( std::error_code(ENOTEMPTY, cat) == std::errc::directory_not_empty );
+#endif
 }
 
 void