Debugging the VM under gdb on cygwin

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Debugging the VM under gdb on cygwin

Eliot Miranda-2
 
Hi All,

    I'm finding it very difficult to debug the 32-bit VM on 64-bit Windows using cygwin.  The default gdb for 64-bit cygwin simply doesn't work properly, finding set facts in programs that work out side of the debugger.  I've tried to build a 32-bit gdb from the 7.11 sources, configuring with ./configure --target=i686-w64-mingw32, but the resulting gdb doesn't find the 32-bit dlls in C:\Windows\SysWOW64', and complains "Don't know how to run.".

Does anyone else have a working gdb for 32-bit programs on 64-bit Windows?  How did you build it?


Does anyone else have a working gdb for 32-bit programs on 32-bit Windows?  How did you build it?  Do I need to create a 32-bit cygwin installation on 32-bit windows for this to work?

Does anyone have the cygwin gdb 7.8 sources or a pointer to them?  One poster claimed that 32-bit gdb on cygwin only works if compiled from the 7.8 sources.

Any other ideas?

AdvThanksance
_,,,^..^,,,_
best, Eliot
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Re: Debugging the VM under gdb on cygwin

Nicolas Cellier
 
Hi Eliot,
I've installed both a cygwin32 and cygwin64 for that reason...
Even if cross compilation works well, cross debugging does not.

2017-07-07 22:37 GMT+02:00 Eliot Miranda <[hidden email]>:
 
Hi All,

    I'm finding it very difficult to debug the 32-bit VM on 64-bit Windows using cygwin.  The default gdb for 64-bit cygwin simply doesn't work properly, finding set facts in programs that work out side of the debugger.  I've tried to build a 32-bit gdb from the 7.11 sources, configuring with ./configure --target=i686-w64-mingw32, but the resulting gdb doesn't find the 32-bit dlls in C:\Windows\SysWOW64', and complains "Don't know how to run.".

Does anyone else have a working gdb for 32-bit programs on 64-bit Windows?  How did you build it?


Does anyone else have a working gdb for 32-bit programs on 32-bit Windows?  How did you build it?  Do I need to create a 32-bit cygwin installation on 32-bit windows for this to work?

Does anyone have the cygwin gdb 7.8 sources or a pointer to them?  One poster claimed that 32-bit gdb on cygwin only works if compiled from the 7.8 sources.

Any other ideas?

AdvThanksance
_,,,^..^,,,_
best, Eliot


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Re: Debugging the VM under gdb on cygwin

Eliot Miranda-2
 


On Jul 7, 2017, at 1:47 PM, Nicolas Cellier <[hidden email]> wrote:

Hi Eliot,
I've installed both a cygwin32 and cygwin64 for that reason...
Even if cross compilation works well, cross debugging does not.

Thanks Nicolas!  I'll get a 32-bit Windows and install 32-bit Cygwin on it.  And I'll update the HowToBuild


2017-07-07 22:37 GMT+02:00 Eliot Miranda <[hidden email]>:
 
Hi All,

    I'm finding it very difficult to debug the 32-bit VM on 64-bit Windows using cygwin.  The default gdb for 64-bit cygwin simply doesn't work properly, finding set facts in programs that work out side of the debugger.  I've tried to build a 32-bit gdb from the 7.11 sources, configuring with ./configure --target=i686-w64-mingw32, but the resulting gdb doesn't find the 32-bit dlls in C:\Windows\SysWOW64', and complains "Don't know how to run.".

Does anyone else have a working gdb for 32-bit programs on 64-bit Windows?  How did you build it?


Does anyone else have a working gdb for 32-bit programs on 32-bit Windows?  How did you build it?  Do I need to create a 32-bit cygwin installation on 32-bit windows for this to work?

Does anyone have the cygwin gdb 7.8 sources or a pointer to them?  One poster claimed that 32-bit gdb on cygwin only works if compiled from the 7.8 sources.

Any other ideas?

AdvThanksance
_,,,^..^,,,_
best, Eliot


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