The behaviour of C++ with declspec sequences on pointer declarations has
changed:
Compiling:
/* declspec.c */
int i = 1;
int __attribute__((aligned(16))) * foo = &i;
int * __attribute__((aligned(16))) bar = &i;
as gcc -xc -W -S declspec.c, I get:
<snip>
.section .drectve
.ascii " -export:bar,data"
.ascii " -export:foo,data"
Compiling above as gcc -xc++ -W -S declspec.c, I get:
<snip>
.section .drectve
.ascii " -export:foo,data"
The attribute is silently ignored for bar.
In gcc-3.3.3 and 3.4.4 , the dllexport attribute was applied
to both declarations in C++, as in C.
In old gcc-2.95.2, the behaviour was the same as in 4.0.0
A similar difference between C and C++ is observed if I
substitute aligned(16) for dllexport, ie, foo is 16-byte
aligned, bar is 4-btye aligned in C++, while both are 16-
byte aligned in C.
Is this a bug, or are declspec sequence rules being followed
more strictly now in C++? If the latter, should there be
some kind of warning at least with -Wextra?
Danny
--
Summary: Declspec sequences on pointer declarations: C++ vs C
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: dannysmith at users dot sourceforge dot net
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: i686-pc-mingw32
GCC host triplet: i686-pc-mingw32
GCC target triplet: i686-pc-mingw32
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20221
