[Issue 17726] Older DMD versions segfault when building Druntime with GCC 7.1

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=17726

Vladimir Panteleev <dlang-bugzilla at thecybershadow.net> changed:

           What    |Removed                     |Added
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           See Also|                            |https://issues.dlang.org/sh
                   |                            |ow_bug.cgi?id=6215

--- Comment #8 from Vladimir Panteleev <dlang-bugzilla at thecybershadow.net> ---
elem* instances aren't 16-byte-aligned because of the following code in
tk/mem.c:

#if defined(__llvm__) && (defined(__GNUC__) || defined(__clang__))
    // LLVM-GCC and Clang assume some types, notably elem (see DMD issue 6215),
    // to be 16-byte aligned. Because we do not have any type information
    // available here, we have to 16 byte-align everything.
    numbytes = (numbytes + 0xF) & ~0xF;
#else
    if (sizeof(size_t) == 2)
        numbytes = (numbytes + 1) & ~1;         /* word align   */
    else
        numbytes = (numbytes + 3) & ~3;         /* dword align  */
#endif

Looks like the same restrictions which apply to LLVM now also apply to GCC 7.

Although I would expect that master would fail in the same way when built with
RELEASE=1, it doesn't seem to be the case.

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