mirror of git://gcc.gnu.org/git/gcc.git
d72888d340
The explicit instantiation declarations for std::basic_string are disabled for C++17 (and later) so that basic_string symbols get implicitly instantiated in every translation unit that needs them. On targets that don't support STB_GNU_UNIQUE this leads to multiple copies of the empty rep symbol for COW strings. In order to detect whether a COW string needs to deallocate its storage it compares the address with the empty rep. When there are multiple copies of the empty rep object the address is not unique, and so string destructors try to delete the empty rep, which crashes. In order to guarantee uniqueness of the _S_empty_rep_storage symbol this patch adds an explicit instantiation declaration for just that symbol. This means the other symbols are still implicitly instantiated in C++17 code, but for the empty rep the definition in the library gets used. Separately, there is no need for C++17 code to implicitly instantiate the I/O functions for strings, so this also restores the explicit instantiation declarations for those functions. PR libstdc++/86138 * include/bits/basic_string.tcc: [__cplusplus > 201402 && !_GLIBCXX_USE_CXX11_ABI] (basic_string<char>::_Rep::_S_empty_rep_storage) (basic_string<wchar_t>::_Rep::_S_empty_rep_storage): Add explicit instantiation declarations. [__cplusplus > 201402] (operator>>, operator<<, getline): Re-enable explicit instantiation declarations. * testsuite/21_strings/basic_string/cons/char/86138.cc: New. * testsuite/21_strings/basic_string/cons/wchar_t/86138.cc: New. From-SVN: r261873 |
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| config | ||
| contrib | ||
| fixincludes | ||
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| include | ||
| intl | ||
| libada | ||
| libatomic | ||
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| libiberty | ||
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| libquadmath | ||
| libsanitizer | ||
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| zlib | ||
| .dir-locals.el | ||
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| .gitignore | ||
| ABOUT-NLS | ||
| COPYING | ||
| COPYING.LIB | ||
| COPYING.RUNTIME | ||
| COPYING3 | ||
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| MAINTAINERS | ||
| Makefile.def | ||
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| compile | ||
| config-ml.in | ||
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| configure | ||
| configure.ac | ||
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| libtool-ldflags | ||
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| missing | ||
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README
This directory contains the GNU Compiler Collection (GCC). The GNU Compiler Collection is free software. See the files whose names start with COPYING for copying permission. The manuals, and some of the runtime libraries, are under different terms; see the individual source files for details. The directory INSTALL contains copies of the installation information as HTML and plain text. The source of this information is gcc/doc/install.texi. The installation information includes details of what is included in the GCC sources and what files GCC installs. See the file gcc/doc/gcc.texi (together with other files that it includes) for usage and porting information. An online readable version of the manual is in the files gcc/doc/gcc.info*. See http://gcc.gnu.org/bugs/ for how to report bugs usefully. Copyright years on GCC source files may be listed using range notation, e.g., 1987-2012, indicating that every year in the range, inclusive, is a copyrightable year that could otherwise be listed individually.