[SOLVED] The mysterious __cxa_throw_bad_array_new_length

pan64 · 12-10-2020, 01:24 AM

no, I do not want it for myself, but you can use ldd to check the used libraries and find the reason.
you can use ldd on *.so files too.
and you can use nm -D <file> | grep symbol to check a symbol (U means it is required, but undefined).

vmelkon · 12-10-2020, 01:52 PM

Code:

nm -D libstdc++.so.6.0.25 | grep __cxa_throw_bad_array_new_length
0000000000091ad0 T __cxa_throw_bad_array_new_length

I compiled the backups of my project and tested them one by one. Previous versions run fine. I think it is when I introduced a resource file into Qt Creator that things broke down.
I'm not sure since I did not do extensive testing.
It is time to stop and try something new.

As for GTK+ or gtkmm, is it possible to have resource files and to have image files in the EXE?
I need an API that can read the resource file and make it the app icon, just like we do in MFC.
I also need to place images on buttons, images on other things.

~~~~vmelkon

vmelkon · 12-30-2020, 03:22 PM

After many tests and recompiles, etc. It looks like the problem comes from one of my free functions that has the form.

Code:

int MyFunction(sint *thing)
{
char **ppp;
ppp=new char*[*thing];
return 1;
}

But my code has been working fine for ages when I compile with VC++6, on Windows.
If I change it to
ppp=new char*[100];

it works fine when I try to run the EXE on a fresh install of Kubuntu.

~~~~vmelkon

NevemTeve · 12-31-2020, 01:13 AM

You seem to have a g++/libstdc++ incompatibility. Those two should come from the same source.

pan64 · 12-31-2020, 03:37 AM

what is sint ?
Whould be nice to post a full example (which can be compiled and tested by anyone).

vmelkon · 12-31-2020, 09:01 AM

Quote:

Originally Posted by pan64

what is sint ?
Whould be nice to post a full example (which can be compiled and tested by anyone).

Sorry, I tried to clean it up for you guys but I missed that one.
sint is my own int.
I also have uchar which is really unsigned char.
.....and so on. That stuff is defined in my
global.h file.

The problem functions are in file
MemoryTracker.h
MemoryTracker.cpp

It is odd.
These 2 functions don't cause any problems.
schar* newschar(sint amount, schar *(&mypointer), const schar *description);
uchar* newuchar(sint amount, uchar *(&mypointer), const schar *description);

as soon as I add one of these
tbool* newtbool(sint amount, tbool *(&mypointer), const schar *description);
sshort* newsshort(sint amount, sshort *(&mypointer), const schar *description);
ushort* newushort(sint amount, ushort *(&mypointer), const schar *description);
and maybe the others, BOOM.

The project page is at
https://sourceforge.net/projects/chemicala

Download the file
ChemicalADlg-v1.7.2_Linux_64_bit_testversion06.zip
Open it with your QT Creator and just compile
or open
folder Lin64 and the EXE is there.

Note: I will soon try to fix the problem. It will take a while since I am tired right now.
I don't even know if I will succeed in fixing the problem

pan64 · 12-31-2020, 12:32 PM

please try to create/prepare a minimal [but working] example, which will fit into a single cpp. Looks like it is no Qt related at all.

vmelkon · 12-31-2020, 02:01 PM

Quote:

Originally Posted by pan64

please try to create/prepare a minimal [but working] example, which will fit into a single cpp. Looks like it is no Qt related at all.

It might be related to QT Creator. I don't know.
Anyway, I made this project.
The main file is just
and the same problem is present.

Code:

#include <iostream>
#include "MemoryTracker.h"



using namespace std;

int main(int argc, char **argv)
{
	cout << "Hello world.\n\n";
	return 0;
}

https://sourceforge.net/projects/chemicala
Download cmdline.zip

~~~~vmelkon

NevemTeve · 01-01-2021, 01:21 AM

Code:

./ChemicalADlg: relocation error: ./ChemicalADlg: 
   symbol __cxa_throw_bad_array_new_length version Qt_5
   not defined in file libQt5Gui.so.5 with link time reference

Well, I still think this symbol should come from libstdc++.so:

Code:

$ nm --with-symbol-versions -D /usr/local/lib64/libstdc++.so |
grep __cxa_throw_bad_array_new_length
0000000000099163 T __cxa_throw_bad_array_new_length@@CXXABI_1.3.8@@CXXABI_1.3.8

But maybe this libQt5Gui.so somehow also exports this __cxa_throw_bad_array_new_length symbol (in some version).

SoftSprocket · 01-01-2021, 09:08 AM

This "version Qt_5 not defined in file libQt5Gui.so.5" certainly makes it sound like a QT5 version issue. The fact that yuor test program with include gives you the same error and it very much seems that is the issue.

vmelkon · 01-01-2021, 09:17 AM

Quote:

Originally Posted by SoftSprocket

This "version Qt_5 not defined in file libQt5Gui.so.5" certainly makes it sound like a QT5 version issue. The fact that your test program with include gives you the same error and it very much seems that is the issue.

If that were true, then no other Qt based application would run. For example, VLC uses Qt.
The Qt .so files comes with your OS.

Quote:

Originally Posted by SoftSprocket

But maybe this libQt5Gui.so somehow also exports this __cxa_throw_bad_array_new_length symbol (in some version).

Possibly. I don't know. I'm a noob and all this looks like magic to me.
All I know is how to compile and get a EXE file. Then, I give the EXE to my buddies and everything is suppose to work.

~~~~vmelkon

SoftSprocket · 01-01-2021, 09:21 AM

Quote:

Originally Posted by vmelkon

If that were true, then no other Qt based application would run. For example, VLC uses Qt.
The Qt .so files comes with your OS.

~~~~vmelkon

???? What on earth makes you think that? Did you compile VLC on your machine using the version of QT you compiled against and then move it to the machine in question?

Try compiling your application on a machine where you get the error and see if the error goes away.

vmelkon · 01-01-2021, 01:43 PM

Quote:

Originally Posted by SoftSprocket

???? What on earth makes you think that? Did you compile VLC on your machine using the version of QT you compiled against and then move it to the machine in question?

No but the VLC page says that they use Qt4
https://www.videolan.org/developers/vlc.html

Quote:

Originally Posted by SoftSprocket

Try compiling your application on a machine where you get the error and see if the error goes away.

Why?

~~~~vmelkon

SoftSprocket · 01-02-2021, 08:17 AM

Yes, well, if you had built against the version of QT used by VLC you would then know you would find there is a good chance you could install on any machine where it was installed (though the possibility still exists you might find a issue), but why confuse your self with reality when willful ignorance seems to be working so well for you?

If you want a download to work on other machines you either use a package system, a static build or have your end users build it following a recipe you provide. What ever magic bullet you are looking for probably doesn't exist. If you continue to conflate your ignorance with others you will find Linux a difficult system to use. It would seem it requires you to learn some things you have not yet learned.

NevemTeve · 01-02-2021, 09:30 AM

ToDo's

1. find this libQt5Gui.so.5

2. check is it exports this symbol:

Code:

nm --with-symbol-versions -D libQt5Gui.so.5 |
grep __cxa_throw_bad_array_new_length

3. if it does export it, find out if it accidental or intentional. (This will be the hard part.)