PR libstdc++/86447
* src/c++11/cow-stdexcept.cc [_GLIBCXX_FULLY_DYNAMIC_STRING]
(logic_error::logic_error(logic_error&&))
(logic_error::operator=(logic_error&&))
(runtime_error::runtime_error(runtime_error&&))
(runtime_error::operator=(runtime_error&&)): Copy strings instead of
moving, to avoid allocating empty reps for moved-from strings.
Tested x86_64-linux, committed to trunk.
commit b06d2a88c3ea36c41c370cf95730d54f764b9f47
Author: Jonathan Wakely <jwak...@redhat.com>
Date: Thu Aug 16 15:31:40 2018 +0100
Fix bootstrap with --enable-fully-dynamic-string
PR libstdc++/86447
* src/c++11/cow-stdexcept.cc [_GLIBCXX_FULLY_DYNAMIC_STRING]
(logic_error::logic_error(logic_error&&))
(logic_error::operator=(logic_error&&))
(runtime_error::runtime_error(runtime_error&&))
(runtime_error::operator=(runtime_error&&)): Copy strings instead of
moving, to avoid allocating empty reps for moved-from strings.
diff --git a/libstdc++-v3/src/c++11/cow-stdexcept.cc
b/libstdc++-v3/src/c++11/cow-stdexcept.cc
index 54859d58820..d271be529a6 100644
--- a/libstdc++-v3/src/c++11/cow-stdexcept.cc
+++ b/libstdc++-v3/src/c++11/cow-stdexcept.cc
@@ -57,6 +57,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// These operations are noexcept even though copying a COW string is not,
// but we know that the string member in an exception has not been "leaked"
// so copying is a simple reference count increment.
+ // For the fully dynamic string moves are not noexcept (due to needing to
+ // allocate an empty string) so we just define the moves as copies here.
logic_error::logic_error(const logic_error& e) noexcept
: exception(e), _M_msg(e._M_msg) { }
@@ -64,10 +66,19 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
logic_error& logic_error::operator=(const logic_error& e) noexcept
{ _M_msg = e._M_msg; return *this; }
+#if _GLIBCXX_FULLY_DYNAMIC_STRING == 0
logic_error::logic_error(logic_error&& e) noexcept = default;
logic_error&
logic_error::operator=(logic_error&& e) noexcept = default;
+#else
+ logic_error::logic_error(logic_error&& e) noexcept
+ : exception(e), _M_msg(e._M_msg) { }
+
+ logic_error&
+ logic_error::operator=(logic_error&& e) noexcept
+ { _M_msg = e._M_msg; return *this; }
+#endif
runtime_error::runtime_error(const runtime_error& e) noexcept
: exception(e), _M_msg(e._M_msg) { }
@@ -76,10 +87,19 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
runtime_error::operator=(const runtime_error& e) noexcept
{ _M_msg = e._M_msg; return *this; }
+#if _GLIBCXX_FULLY_DYNAMIC_STRING == 0
runtime_error::runtime_error(runtime_error&& e) noexcept = default;
runtime_error&
runtime_error::operator=(runtime_error&& e) noexcept = default;
+#else
+ runtime_error::runtime_error(runtime_error&& e) noexcept
+ : exception(e), _M_msg(e._M_msg) { }
+
+ runtime_error&
+ runtime_error::operator=(runtime_error&& e) noexcept
+ { _M_msg = e._M_msg; return *this; }
+#endif
// New C++11 constructors:
