1 Workaround for buglet in std::vector etc. when compiling
2 with gcc-4.0.1 -Wall -O -fno-exceptions
5 .../include/c++/4.0.0/bits/vector.tcc: In member function 'void std::vector<_Tp,
6 _Alloc>::reserve(size_t) [with _Tp = int, _Alloc = std::allocator<int>]':
7 .../include/c++/4.0.0/bits/vector.tcc:78: warning: control may reach end of
8 non-void function 'typename _Alloc::pointer std::vector<_Tp,
9 _Alloc>::_M_allocate_and_copy(size_t, _ForwardIterator, _ForwardIterator) [with
10 _ForwardIterator = int*, _Tp = int, _Alloc = std::allocator<int>]' being inlined
12 See http://gcc.gnu.org/PR21951
14 To: gcc-patches at gcc dot gnu dot org
15 Subject: [4.0.x] may reach end warning in system headers
16 Message-Id: <20050701183024.E138714C16A9@geoffk5.apple.com>
17 Date: Fri, 1 Jul 2005 11:30:24 -0700 (PDT)
18 From: gkeating at apple dot com (Geoffrey Keating)
21 One of our users was getting
23 /usr/include/gcc/darwin/4.0/c++/bits/stl_uninitialized.h:113: warning:
24 control may reach end of non-void function '_ForwardIterator
25 std::__uninitialized_copy_aux(_InputIterator, _InputIterator,
26 _ForwardIterator, __false_type) [with _InputIterator =
27 __gnu_cxx::__normal_iterator<TPoolAllocator::tAllocState*,
28 std::vector<TPoolAllocator::tAllocState,
29 std::allocator<TPoolAllocator::tAllocState> > >, _ForwardIterator =
30 __gnu_cxx::__normal_iterator<TPoolAllocator::tAllocState*,
31 std::vector<TPoolAllocator::tAllocState,
32 std::allocator<TPoolAllocator::tAllocState> > >]' being inlined
34 which shouldn't be happening, he has no way to change a standard C++
35 header. The warning is bogus anyway, but it's fixed in 4.1 through
36 the CFG changes, which I don't really want to backport to the 4.0
37 branch, so instead I'll add this patch. Other warnings generated from
38 tree-inline.c check for DECL_SYSTEM_HEADER like this.
40 Bootstrapped & tested on powerpc-darwin8, I'll commit when the branch
44 - Geoffrey Keating <geoffk@apple.com>
46 ===File ~/patches/gcc-40-4121982.patch======================
48 2005-06-28 Geoffrey Keating <geoffk@apple.com>
50 * tree-inline.c (expand_call_inline): Prevent 'may reach end'
51 warning in system headers.
54 ===================================================================
55 RCS file: /cvs/gcc/gcc/gcc/tree-inline.c,v
56 retrieving revision 1.170.8.4
57 diff -u -p -u -p -r1.170.8.4 tree-inline.c
58 --- gcc-4.0.1/gcc/tree-inline.c.old 6 Jun 2005 19:20:32 -0000 1.170.8.4
59 +++ gcc-4.0.1/gcc/tree-inline.c 1 Jul 2005 18:27:26 -0000
60 @@ -1693,7 +1693,8 @@ expand_call_inline (tree *tp, int *walk_
61 && !TREE_NO_WARNING (fn)
62 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (fn)))
63 && return_slot_addr == NULL_TREE
64 - && block_may_fallthru (copy))
65 + && block_may_fallthru (copy)
66 + && !DECL_IN_SYSTEM_HEADER (fn))
68 warning ("control may reach end of non-void function %qD being inlined",
70 ============================================================