trying to make m68k-amigaos-gdb on windows

[jotd]

Following step from https://franke.ms/amiga/gdb8.wiki I'm successfully using the cross compiler already, and installed the amiga side gdb server successfully.


But now I have a windows-side issue:
m68k-amigaos-gdb cannot find "libpython27.dll".


So I installed python for cygwin (because this library is in the python package for cygwin)


But now one entrypoint (__chk_fail) is missing in my libpython27.dll version (from python 2.7.16).


Anyone with a working gdb/python dll setup to share?

[bebbo]

Originally Posted by jotd

Following step from https://franke.ms/amiga/gdb8.wiki I'm successfully using the cross compiler already, and installed the amiga side gdb server successfully.


But now I have a windows-side issue:
m68k-amigaos-gdb cannot find "libpython27.dll".


So I installed python for cygwin (because this library is in the python package for cygwin)


But now one entrypoint (__chk_fail) is missing in my libpython27.dll version (from python 2.7.16).


Anyone with a working gdb/python dll setup to share?

python and python-devel are both on the list of prerequisites.


=> Install all the listed packages rinse and repeat.

[jotd]

Thanks for replying in person (and also for your work, this is great for the amiga)

I didn't need cygwin to compile with the Amiga cross compiler until gdb asks for this cygwin only DLL.

I've updated to the new gcc exe setup from your page and gdb runs from cygwin at least. I think it's possible to make it run natively from windows too

sorry, the old 6.4 version I was stuck on wasn't working.

Excellent work.

[pipper]

The other option is to compile gdb without python support in first place. I don’t know offhand what flag to pass, maybe Bebbo can help out.

[jotd]

thanks, I'd like to avoid compiling gdb on windows. I have edited my post after you replied. New version works from cygwin so that's a start

I wasn't aware that amiga gcc setup was built daily!

Reminding the link which is lost in the 50 pages of the amiga gcc thread

http://eab.abime.net/showthread.php?t=85474&page=52

[bebbo]

Originally Posted by jotd

thanks, I'd like to avoid compiling gdb on windows. I have edited my post after you replied. New version works from cygwin so that's a start

I wasn't aware that amiga gcc setup was built daily!

Reminding the link which is lost in the 50 pages of the amiga gcc thread

http://eab.abime.net/showthread.php?t=85474&page=52

Just a side note: https://franke.ms/download/setup-amiga-gcc.exe is not compiled using cygwin - it uses msys2...

[jotd]

yeah, it's very good that it uses msys2 because i can integrate it in my native toolchains & cmds. After another test, now I don't need cygwin anymore (debugger works without it too so good work)

Today I could connect the debugger to WinUAE with success. Only problem is that the debugger reports that no symbols are found. But there ARE symbols. I've used -g -O0 options and nm reports that there are symbols...

Did I miss something?

C:\DATA\jff\data\C++\games\Bagman>m68k-amigaos-nm bagman | more
000012ec D _DOSBase
00005264 D _GfxBase
0000526c D _IntuitionBase
000012f4 D _MathIeeeDoubBasBase
00005274 D _MathIeeeDoubTransBase
0000527c D _MathIeeeSingBasBase
000574de T _SDL_AddTimer
00056efe T _SDL_CreateRGBSurface
000572dc T _SDL_Delay
000571ee T _SDL_DisplayFormat
00057058 T _SDL_FillRect
...

gdb failing to load symbols:

C:\DATA\jff\data\C++\games\Bagman>m68k-amigaos-gdb bagman
GNU gdb (GDB) 8.3.50.191012-223043-git
Copyright (C) 2019 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "--host=x86_64-pc-msys --target=m68k-amigaos".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from bagman...
(No debugging symbols found in bagman)
(gdb)

[bebbo]

Originally Posted by jotd

yeah, it's very good that it uses msys2 because i can integrate it in my native toolchains & cmds. After another test, now I don't need cygwin anymore (debugger works without it too so good work)

Today I could connect the debugger to WinUAE with success. Only problem is that the debugger reports that no symbols are found. But there ARE symbols. I've used -g -O0 options and nm reports that there are symbols...

Did I miss something?

C:\DATA\jff\data\C++\games\Bagman>m68k-amigaos-nm bagman | more
000012ec D _DOSBase
00005264 D _GfxBase
0000526c D _IntuitionBase
000012f4 D _MathIeeeDoubBasBase
00005274 D _MathIeeeDoubTransBase
0000527c D _MathIeeeSingBasBase
000574de T _SDL_AddTimer
00056efe T _SDL_CreateRGBSurface
000572dc T _SDL_Delay
000571ee T _SDL_DisplayFormat
00057058 T _SDL_FillRect
...

gdb failing to load symbols:

C:\DATA\jff\data\C++\games\Bagman>m68k-amigaos-gdb bagman
GNU gdb (GDB) 8.3.50.191012-223043-git
Copyright (C) 2019 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "--host=x86_64-pc-msys --target=m68k-amigaos".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from bagman...
(No debugging symbols found in bagman)
(gdb)

there are symbols: function names
and symbols: debug information


despite the use of symbol for both it's different kind of information.


So it seems you are creating object files containing debug infos, do you also link properly?


That's either m68k-amigaos-gcc -g *.o -o exefile
or m68k-amigaos-ld -amiga-debug-hunk ... -o exefile





And a hint here: instead of copying the file to the Amiga use m68k-amigaos-strip exefile -o path/to/amiga/exefile since there is no use of loading the debug info into the Amiga's ram.

[jotd]

no I didn't use -amiga-debug-hunk. nor -g to link. Adding -amiga-debug-hunk fixes the issue. I've started the program and stopped in main. Well done & thanks for the quick answer.

[shoestring]

Bumping an old thread

I've been trying to get gdb to work for a few days now to no avail.

It seems to crash when I try listing the symbols, any ideas ?

I used the package containing pre-compiled binaries for CentOS. I also tried recompiling from scratch and get the same fault in CentOS and Ubuntu. All the other binaries work fine except for gdb

For reference here's a simple c program and error right at the end.



#include <stdio.h>

int main(int argc, char** argv)
{
for(int i=0;i<argc;i++)
printf("Arg #%d -> "%s"\n",i,argv[i]);
return 0;
}

[shoestring@amigadev ~]$ /home/shoestring/opt/amiga/bin/m68k-amigaos-gcc -g main.cpp -o main

[shoestring@amigadev ~]$ /home/shoestring/opt/amiga/bin/m68k-amigaos-gdb main
GNU gdb (GDB) 10.0.50.201222-135122-git
Copyright (C) 2020 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "--host=x86_64-pc-linux-gnu --target=m68k-amigaos".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from main...
(gdb) list
Aborted (core dumped)

[bebbo]

Originally Posted by shoestring

... [read above]


Aborted (core dumped)

1. your example does not compile
fixed version is

#include <stdio.h>

int main(int argc, char** argv)
{
for(int i=0;i<argc;i++)
printf("Arg #%d -> %s\n",i,argv[i]);
return 0;
}

2. use -noixemul (unless you are forced to use something different)


3. why .cpp for a C-source? never mind...

... ahhh - maybe that's the crash's cause!?


for .c it's working



I'll look into it, if I have time

[bebbo]

fix for this specific issue is queued - should be live soon

(gdb) list
1       #include <stdio.h>
2
3       int main(int argc, char** argv)
4       {
5       for(int i=0;i<argc;i++)
6       printf("Arg #%d -> %s\n",i,argv[i]);
7       return 0;
8       }
9
(gdb)

[shoestring]

Originally Posted by bebbo

[/code]


3. why .cpp for a C-source? never mind...

... ahhh - maybe that's the crash's cause!?


for .c it's working



I'll look into it, if I have time

Woops, bad habits re using gcc to compile .cpp files. I didn't catch that.

That was quick. Downloaded, cloned the source and built it this morning.

I really appreciate your help.