libstdc++: Fix bootstrap with -fno-rtti [PR 99077]

When libstdc++ is built without RTTI the __ios_failure type is just an
alias for std::ios_failure, so trying to construct it from an int won't
compile. This changes the RTTI-enabled __ios_failure type to have the
same constructor parameters as std::ios_failure, so that the constructor
takes the same arguments whether RTTI is enabled or not.

The __throw_ios_failure function now constructs the error_code, instead
of the __ios_failure constructor. As a drive-by fix that error_code is
constructed with std::generic_category() not std::system_category(),
because the int comes from errno which corresponds to the generic
category.

libstdc++-v3/ChangeLog:

	PR libstdc++/99077
	* src/c++11/cxx11-ios_failure.cc (__ios_failure(const char*, int)):
	Change int parameter to error_code, to match std::ios_failure.
	(__throw_ios_failure(const char*, int)): Construct error_code
	from int parameter.

diff --git a/libstdc++-v3/src/c++11/cxx11-ios_failure.cc b/libstdc++-v3/src/c++11/cxx11-ios_failure.cc
index e82c1aaf63b8bab53dee6ada4a4c4a535f496c1a..a918ab21015f58f454c3027a6ea81419309b9982 100644 (file)
--- a/libstdc++-v3/src/c++11/cxx11-ios_failure.cc
+++ b/libstdc++-v3/src/c++11/cxx11-ios_failure.cc
@@ -114,7 +114,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     __ios_failure(const char* s) : failure(s)
     { __construct_ios_failure(buf, runtime_error::what()); }
 
-    __ios_failure(const char* s, int e) : failure(s, to_error_code(e))
+    __ios_failure(const char* s, const error_code& e) : failure(s, e)
     { __construct_ios_failure(buf, runtime_error::what()); }
 
     ~__ios_failure()
@@ -125,10 +125,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     // There are assertions in src/c++98/ios_failure.cc to ensure the size
     // and alignment assumptions are valid.
     alignas(runtime_error) unsigned char buf[sizeof(runtime_error)];
-
-    static error_code
-    to_error_code(int e)
-    { return e ? error_code(e, system_category()) : io_errc::stream; }
   };
 
   // Custom type info for __ios_failure.
@@ -171,7 +167,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   void
   __throw_ios_failure(const char* str __attribute__((unused)),
                      int err __attribute__((unused)))
-  { _GLIBCXX_THROW_OR_ABORT(__ios_failure(_(str), err)); }
+  {
+    _GLIBCXX_THROW_OR_ABORT(__ios_failure(_(str),
+         err ? error_code(err, generic_category()) : io_errc::stream));
+  }
 
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace