Sent from my iPhone
On Mar 11, 2010, at 3:24 AM, "eric dot niebler at gmail dot com" <gcc-bugzi...@gcc.gnu.org
> wrote:
According to the C++0x status page
(http://gcc.gnu.org/gcc-4.5/cxx0x_status.html), "Standard Layout
Types"
(http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2342.htm)
have been
implemented in gcc-4.5. A quick test shows that trivial types are
not being
statically initialized, as the paper requires. The following struct
S is
trivial and the non-local constant s should be statically
initialized, IIUC:
struct S
{
S() {}
};
The above is not a trivial type though. It has a non trivial default
constructor. If you want a trivial constructor use either "= default"
or delete it all together.
S const s{};
However, when compiled with -O2 -std=c++0x -S using the latest 4.5
snapshot, I
see the following assembly:
.file "main.cpp"
.text
.p2align 4,,15
.def __GLOBAL__I_main.cpp; .scl 3; .type
32; .endef
__GLOBAL__I_main.cpp:
pushl %ebp
movl %esp, %ebp
popl %ebp
ret
.section .ctors,"w"
.align 4
.long __GLOBAL__I_main.cpp
Unless I'm mistaken, the global s is still being dynamically
initialized.
Apologies in advance if I'm reading this wrong.
--
Summary: trivial types are not being statically initialized
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: eric dot niebler at gmail dot com
GCC build triplet: gcc-4.5-20100304
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43330
