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Jonathan Wakely 8edb614205 libstdc++: Make __gnu_cxx::sequence_buffer move-aware [PR101542] 
The PR explains that Clang trunk now selects a different constructor
when a non-const sequence_buffer is returned in a context where it
qualifies as an implicitly-movable entity. Because lookup is first
performed using an rvalue, the sequence_buffer(const sequence_buffer&)
constructor gets chosen, which makes a copy instead of a "pseudo-move"
via the sequence_buffer(sequence_buffer&) constructor. The problem isn't
seen with GCC because as noted in the r11-2412 commit log, GCC actually
implements a slightly modified rule that avoids breaking exactly this
type of code.

This patch adds a move constructor to sequence_buffer, so that implicit
or explicit moves will have the same effect, calling the
sequence_buffer(sequence_buffer&) constructor. A move assignment
operator is also added to make move assignment work similarly.

Signed-off-by: Jonathan Wakely <jwakely@redhat.com>

libstdc++-v3/ChangeLog:

	PR libstdc++/101542
	* include/ext/rope (sequence_buffer): Add move constructor and
	move assignment operator.
	* testsuite/ext/rope/101542.cc: New test.
2021-07-21 17:20:37 +01:00
..
config ctype support for libstdc++ on VxWorks 2021-05-04 21:49:43 -03:00
doc libstdc++: Improvements to Doxygen markup 2021-07-01 18:45:48 +01:00
include libstdc++: Make __gnu_cxx::sequence_buffer move-aware [PR101542] 2021-07-21 17:20:37 +01:00
libsupc++ libstdc++: Improvements to Doxygen markup 2021-07-01 18:45:48 +01:00
po Update copyright years. 2021-01-04 10:26:59 +01:00
python libstdc++: Fix installation of python hooks [PR 99453] 2021-06-01 13:29:34 +01:00
scripts libstdc++: Allow lualatex to be used for Doxygen PDF 2021-05-17 12:13:41 +01:00
src libstdc++: Fix create_directories to resolve symlinks [PR101510] 2021-07-20 20:34:47 +01:00
testsuite libstdc++: Make __gnu_cxx::sequence_buffer move-aware [PR101542] 2021-07-21 17:20:37 +01:00
acinclude.m4 ctype support for libstdc++ on VxWorks 2021-05-04 21:49:43 -03:00
aclocal.m4
ChangeLog Daily bump. 2021-07-21 00:16:54 +00:00
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ChangeLog-2020 libstdc++: Fix typo in ChangeLog-2020 2021-01-13 11:02:13 +00:00
config.h.in libstdc++: Remove _GLIBCXX_USE_INT128 autoconf macro 2021-05-04 12:07:09 +01:00
configure ctype support for libstdc++ on VxWorks 2021-05-04 21:49:43 -03:00
configure.ac libstdc++: Remove _GLIBCXX_USE_INT128 autoconf macro 2021-05-04 12:07:09 +01:00
configure.host Scope libstdc++ configuration for vxworks to all versions 2020-10-22 16:40:57 +00:00
crossconfig.m4 Scope libstdc++ configuration for vxworks to all versions 2020-10-22 16:40:57 +00:00
fragment.am libstdc++: Add C++ runtime support for new 128-bit long double format 2020-12-16 23:25:01 +00:00
linkage.m4
Makefile.am Update copyright years. 2021-01-04 10:26:59 +01:00
Makefile.in libstdc++: Add C++ runtime support for new 128-bit long double format 2020-12-16 23:25:01 +00:00
README

README 

file: libstdc++-v3/README

New users may wish to point their web browsers to the file
index.html in the 'doc/html' subdirectory.  It contains brief
building instructions and notes on how to configure the library in
interesting ways.