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Re: C++ program produces no output (g++ 4.3.2, cygwin 1.7)
- From: Dave Korn <dave dot korn dot cygwin at googlemail dot com>
- To: cygwin at cygwin dot com
- Date: Fri, 24 Apr 2009 20:19:07 +0100
- Subject: Re: C++ program produces no output (g++ 4.3.2, cygwin 1.7)
- References: <gsqjs7$qsb$1@ger.gmane.org>
Eric Lilja wrote:
> The code was written september 2007 and then it ran and displayed its
> output just fine. It's a simple AVL Tree with a small test program.
> I'm using g++ 4.3.2. Something seems to be up with cygcheck too, because
> I have attached the wierd looking output it gave me (and it took a while
> for it to complete as well).
Something seems to be up with tar as well, unless you meant for all those
files to have no perms when unpacked?
$ tar xvf cpp-program.tar
AVL_Tree.h
AVL_Tree.cc
avl_tree-test.cc
Makefile
$ ls -lart
total 105
---------- 1 DKAdmin None 299 Sep 13 2007 Makefile
---------- 1 DKAdmin None 1584 Sep 13 2007 AVL_Tree.h
---------- 1 DKAdmin None 13774 Sep 13 2007 AVL_Tree.cc
---------- 1 DKAdmin None 5616 Apr 23 21:31 avl_tree-test.cc
drwxrwxrwt 1 DKAdmin None 73728 Apr 24 20:06 ..
drwxr-xr-x 1 DKAdmin None 4096 Apr 24 20:06 .
$
> Maybe someone could try the program I attached and see if they get the
> same problems as me?
$ make
g++ -Wall -Wextra -std=c++98 -pedantic -g -c avl_tree-test.cc
AVL_Tree.cc: In static member function 'static void
AVL_Tree_Node<Comparable>::insert(const Comparable&,
AVL_Tree_Node<Comparable>*&) [with Comparable = int]':
AVL_Tree.cc:481: instantiated from 'void AVL_Tree<Comparable>::insert(const
Comparable&) [with Comparable = int]'
avl_tree-test.cc:20: instantiated from here
AVL_Tree.cc:194: warning: null argument where non-null required (argument 1)
g++ avl_tree-test.o -o testavl.exe
$ ./testavl.exe ; echo $?
Entering main()
Performing LL-test.
Should perform single_rotate_with_left_child.
Inserting 50, 22, 75, 80, 43, 15, 9.
80
/
75
/
50
\
43
/
22
\
15
\
9
Removing 80.
Performing single_rotate_with_left_child
75
/
50
\
43
/
22
\
15
\
9
Performing LR-rest.
Should perform double_rotate_with_left_child.
Inserting 50, 22, 75, 80, 43, 15, 28.
80
/
75
/
50
\
43
\
28
/
22
\
15
Removing 80.
Peforming double_rotate_with_left_child
75
/
50
/
43
\
28
/
22
\
15
Performing RR-test.
Should perform single_rotate_with_right_child.
Inserting 50, 35, 75, 25, 65, 85, 95.
95
/
85
/
75
\
65
/
50
\
35
\
25
Removing 25.
Performing single_rotate_with_right_child.
95
/
85
/
75
\
65
/
50
\
35
Performing RL-test.
Should perform double_rotate_with_right_child.
Inserting 50, 25, 75, 15, 65, 80, 70.
80
/
75
\
70
/
65
/
50
\
25
\
15
Removing 15.
Performing double_rotate_with_right_child.
80
/
75
\
70
/
65
\
50
\
25
0
$
> I don't know how to use gdb, but I did try running my code under gdb,
> here's what I got:
> $ gdb testavl.exe
> Program exited with code 030000000005.
That's octal for 0xC0000005 aka STATUS_ACCESS_VIOLATION. Does adding
"-Wl,--enable-auto-import" to LDFLAGS help any?
cheers,
DaveK
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