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gcc/libstdc++-v3
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Jonathan Wakely e1008cd1d8 libstdc++: Make std::copy_n work with negative and non-integral sizes 
Since it was added in C++11, std::copy_n and std::ranges::copy_n should
do nothing given a negative size, but for random access iterators we add
the size to the iterator, possibly resulting in undefined behaviour.

Also, C++20 clarified that std::copy_n requires the Size type to be
convertible to an integral type. We previously assumed that it could be
directly used in arithmetic expressions, without conversion to an
integral type.

This also fixes a bug in the random_access_iterator_wrapper helper adds
some convenience aliases for using the iterator wrappers.

libstdc++-v3/ChangeLog:

	* include/bits/ranges_algobase.h (__copy_n_fn): Only call
	ranges::copy for positive values.
	* include/bits/stl_algo.h (copy_n): Convert Size argument to an
	integral type and only call __copy_n for positive values.
	* testsuite/util/testsuite_iterators.h
	(random_access_iterator_wrapper::operator+=): Fix range check for
	negative values.
	(output_container, input_container, forward_container)
	(bidirectional_container, random_access_container): New alias
	templates.
	* testsuite/25_algorithms/copy_n/5.cc: New test.
2020-06-04 14:21:34 +01:00
..
config Update the baseline symbols for SPARC64/Linux 2020-05-07 10:56:51 +02:00
doc libstdc++: Document API changes in GCC 10 2020-06-01 16:50:53 +01:00
include libstdc++: Make std::copy_n work with negative and non-integral sizes 2020-06-04 14:21:34 +01:00
libsupc++ libstdc++: Fix the return type of __cxa_finalize 2020-05-04 23:07:19 +01:00
po Add `--with-toolexeclibdir=' configuration option 2020-01-24 11:24:25 +00:00
python libstdc++: Fix regression in libstdc++-prettyprinters/cxx20.cc 2020-02-17 13:20:57 +00:00
scripts Update copyright years. 2020-01-01 12:51:42 +01:00
src libstdc++: Refactor filesystem::path string conversions 2020-05-23 09:40:16 +01:00
testsuite libstdc++: Make std::copy_n work with negative and non-integral sizes 2020-06-04 14:21:34 +01:00
acinclude.m4 libstdc++: Replace glibc-specific check for clock_gettime (PR 93325) 2020-01-28 13:24:09 +00:00
aclocal.m4 Add `--with-toolexeclibdir=' configuration option 2020-01-24 11:24:25 +00:00
ChangeLog Daily bump. 2020-06-03 00:16:34 +00:00
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ChangeLog-2019 libstdc++: Fix whitespace in ChangeLog-2019 2020-01-09 21:31:35 +00:00
config.h.in libstdc++: Add full steady_clock support to shared_timed_mutex 2019-12-02 16:23:10 +00:00
configure Check for more missing math decls on vxworks. 2020-05-31 14:32:27 -07:00
configure.ac libstdc++: Add full steady_clock support to shared_timed_mutex 2019-12-02 16:23:10 +00:00
configure.host [ARM/FDPIC v6 24/24] [ARM] FDPIC: Handle arm*-*-uclinuxfdpiceabi in libstdc++ configure scripts 2019-09-10 10:13:20 +02:00
crossconfig.m4 Check for more missing math decls on vxworks. 2020-05-31 14:32:27 -07:00
fragment.am
linkage.m4
Makefile.am Update copyright years. 2020-01-01 12:51:42 +01:00
Makefile.in Add `--with-toolexeclibdir=' configuration option 2020-01-24 11:24:25 +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.