[STDCXX-1068] HP/UX's aCC alignment problems misalign everyone else

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 4.2.1, 4.2.x, 4.3.x
• Fix Version/s: 4.2.x, 4.3.x
• Component/s: 21. Strings

Environment

Any compiler besides HP/UX's aCC.

• Patch Info: Patch Available
• Severity: Incorrect Behavior
• Assignee: Unassigned
• Reporter: Stefan Teleman
• Created: 20/Sep/12 19:22
• Updated: 27/Sep/12 14:02
• Resolved: 27/Sep/12 14:02

Description

The following code in include/rw/_strref.h at line 245:

_strref.h

    union {
        size_type _C_size;    // Number of actual data values stored
        _CharT    _C_dummy;   // force the alignment of the first char
    } _C_size;                // named to work around an HP aCC 3.30 bug

causes misaligned reads/writes with SunPro 12.1, 12.2, 12.3 on Solaris (SPARC and Intel) and Linux (Intel), GCC 4.5.2 and 4.7.1 (Linux Intel) and Intel 2003 (Linux Intel).

The following patch fixes the problem:

_strref.h

     union {
         size_type _C_size;    // Number of actual data values stored
+#if defined(__HP_aCC)
         _CharT    _C_dummy;   // force the alignment of the first char
-    } _C_size;                // named to work around an HP aCC 3.30 bug
+#endif                        // named to work around an HP aCC 3.30 bug
+    } _C_size;
 };