David Edelsohn fb39c4fe44 aix: make ctype_inline.h thread-safe and avoid _OBJ_DATA char subscript. ... g++.dg/warn/Wstringop-overflow-6.C tests for a bogus overflow warning in system headers. This testcase was generating a -Wchar-subscript warning on AIX because ctype_inline.h was subscripting AIX _OBJ_DATA using a char. The _M_table case cast the subscript to unsigned char, but the _OBJ_DATA case did not. The investigation also exposed that AIX has added a thread-safe variant of access to __lc_type that had not been applied to the libstdc++ implementation. This patch casts the subscript to unsigned char and adds the THREAD_SAFE variant. libstdc++ always is compiled with pthreads, but it is good to make the situation explicit and to document the appropriate usage. Bootstrapped on powerpc-ibm-aix7.2.3.0. libstdc++-v3/ChangeLog: * config/os/aix/ctype_inline.h (bool ctype<char>:: is): Cast _OBJ_DATA subscript to unsigned char. Add _THREAD_SAFE access to __lc_type. (const char* ctype<char>:: is): Same.		2021-01-20 17:42:02 -05:00
..
abi	Update copyright years.	2021-01-04 10:26:59 +01:00
allocator	Update copyright years.	2021-01-04 10:26:59 +01:00
cpu	Update copyright years.	2021-01-04 10:26:59 +01:00
io	Update copyright years.	2021-01-04 10:26:59 +01:00
locale	Update copyright years.	2021-01-04 10:26:59 +01:00
os	aix: make ctype_inline.h thread-safe and avoid _OBJ_DATA char subscript.	2021-01-20 17:42:02 -05:00