[STDCXX-832] [HP aCC 6.16] warning #4232 in <string>: conversion from "wchar_t *" to a more strictly aligned type

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 4.2.0
• Fix Version/s: 4.2.1
• Component/s: 21. Strings

Environment

aCC: HP C/aC++ B3910B A.06.16 [Nov 26 2007]

• Severity: Compiler Warning
• Assignee: Martin Sebor
• Reporter: Martin Sebor
• Created: 07/Apr/08 22:40
• Updated: 25/Apr/08 05:02
• Resolved: 07/Apr/08 23:38

Description

Nightly builds with HP aCC 6.16 produce many warnings like the following:

aCC -c    -mt -I$(TOPDIR)/include -I$(BUILDDIR)/include  -AA  +O2  +DD64 +w \
    +W392,655,684,818,819,849 \
    +W2193,2236,2261,2340,2401,2487 \
    +W4227,4229,4231,4235,4237,4249 \
    +W4255,4272,4284,4285,4286,4296,4297 +W3348    \
    $(TOPDIR)/src/ti_wnum_put.cpp
"$(TOPDIR)/include/string", line 842: warning #4232-D: conversion from "wchar_t *" to a more strictly aligned type "__rw::__string_ref<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t>> *" may cause misaligned access
          return _RWSTD_REINTERPRET_CAST (_C_string_ref_type*, _C_data) - 1; 
                 ^
          detected during:
            instantiation of "__rw::__string_ref<_Traits::char_type, _Traits, _Allocator> *std::basic_string<_CharT, _Traits, _Allocator>::_C_pref() const [with _CharT=wchar_t, _Traits=std::char_traits<wchar_t>, _Allocator=std::allocator<wchar_t>]" at line 899
            instantiation of "void std::basic_string<_CharT, _Traits, _Allocator>::_C_unlink(_Allocator::pointer) [with _CharT=wchar_t, _Traits=std::char_traits<wchar_t>, _Allocator=std::allocator<wchar_t>]" at line 198
            instantiation of "std::basic_string<_CharT, _Traits, _Allocator>::~basic_string() [with _CharT=wchar_t, _Traits=std::char_traits<wchar_t>, _Allocator=std::allocator<wchar_t>]" at line 99 of "$(TOPDIR)/include/loc/_num_put.cc"
            instantiation of "_OutputIter std::num_put<_CharT, _OutputIter>::_C_put(_OutputIter, std::ios_base &, _CharT, int, const void *) const [with _CharT=wchar_t, _OutputIter=std::ostreambuf_iterator<wchar_t, std::char_traits<wchar_t>>]" at line 183 of "$(TOPDIR)/include/loc/_num_put.h"

Here's the count from a recent build:

$ gunzip -c hpux-11.31-ia64-acc-6.16-12S-645002-log.gz | grep "include/string\", .*: warning #4232" | wc -l
87