mirror of git://gcc.gnu.org/git/gcc.git
b48785e9ab
When -faligned-new (or Clang's -faligned-allocation) is used our
allocators try to support extended alignments, gated on the
__cpp_aligned_new macro. However, because they use alignof(_Tp) which is
not a keyword in C++98 mode, using -std=c++98 -faligned-new results in
errors from <memory> and other headers.
We could change them to use __alignof__ instead of alignof, but that
would potentially alter the result of the conditions, because e.g.
alignof(long long) != __alignof__(long long) on some targets. That's
probably not an issue for any types with extended alignment, so maybe it
would be a safe change.
For now, it seems acceptable to just disable the extended alignment
support in C++98 mode, so that -faligned-new enables std::align_val_t
and the corresponding operator new overloads, but doesn't affect
std::allocator, __gnu_cxx::__bitmap_allocator etc.
libstdc++-v3/ChangeLog:
PR libstdc++/104395
* include/bits/new_allocator.h: Disable extended alignment
support in C++98 mode.
* include/ext/bitmap_allocator.h: Likewise.
* include/ext/malloc_allocator.h: Likewise.
* include/ext/mt_allocator.h: Likewise.
* include/ext/pool_allocator.h: Likewise.
* testsuite/ext/104395.cc: New test.
(cherry picked from commit
|
||
|---|---|---|
| .. | ||
| pb_ds | ||
| algorithm | ||
| aligned_buffer.h | ||
| alloc_traits.h | ||
| atomicity.h | ||
| bitmap_allocator.h | ||
| cast.h | ||
| cmath | ||
| codecvt_specializations.h | ||
| concurrence.h | ||
| debug_allocator.h | ||
| enc_filebuf.h | ||
| extptr_allocator.h | ||
| functional | ||
| iterator | ||
| malloc_allocator.h | ||
| memory | ||
| mt_allocator.h | ||
| new_allocator.h | ||
| numeric | ||
| numeric_traits.h | ||
| pod_char_traits.h | ||
| pointer.h | ||
| pool_allocator.h | ||
| random | ||
| random.tcc | ||
| rb_tree | ||
| rc_string_base.h | ||
| rope | ||
| ropeimpl.h | ||
| slist | ||
| sso_string_base.h | ||
| stdio_filebuf.h | ||
| stdio_sync_filebuf.h | ||
| string_conversions.h | ||
| throw_allocator.h | ||
| type_traits.h | ||
| typelist.h | ||
| vstring.h | ||
| vstring.tcc | ||
| vstring_fwd.h | ||
| vstring_util.h | ||