Re: [Mingw-users] Cross-compiler, and dw2 or sjlj EH

[Michael G. <mg...@te...>]

> I've build a cross-compiler with the notes from the wiki here:
> http://www.mingw.org/MinGWiki/index.php/build%20a%20Win32%20x-compiler%20=
for%20Linux

That's exactly what I'm doing myself.

> I compiled QT on windows, using mingw's win32 compiler (fresh install,=20
> using candidate packages), and I cross-compiled an application that=20
> links to the generated qt library.

Again that's exactly what me and a couple of other developers
in my company are doing regularly.

> Now I see strange errors such as:
> /opt/qt-3.3.4-win32/lib/libqtmain.a(qtmain_win.o):qtmain_win.cpp:(.text+0=
x148):=20
> undefined reference to `___gxx_personality_sj0'
> /opt/qt-3.3.4-win32/lib/libqtmain.a(qtmain_win.o):qtmain_win.cpp:(.text+0=
x161):=20
> undefined reference to `__Unwind_SjLj_Register'
> /opt/qt-3.3.4-win32/lib/libqtmain.a(qtmain_win.o):qtmain_win.cpp:(.text+0=
x24f):=20
> undefined reference to `__Unwind_SjLj_Unregister'
> /opt/qt-3.3.4-win32/lib/libqtmain.a(qtmain_win.o):qtmain_win.cpp:(.text+0=
x295):=20
> undefined reference to `__Unwind_SjLj_Resume'

Never seen them.

Some guesses:
Have you enabled any "non-default" options when building Qt ?
Which are your (c++) options when crosscompiling the application ?

> I guess its got something to do with Michael Gerdau's attempts to use=20
> DW2 EH instead of the slower (but reliable) SJLJ EH...

Shouldn't DW2 EH work with the recent toolchain ?

> What exactly does this script attempt to build?

A Linux based crosscompiler for Win32, i.e. you run under Linux
and by means of this crosscompiler you generate *.dll/*.exe that
run under Linux.

My company does this for a few years now with basically the
procedure outlined in the provided script.

> Is it compatible with the win32 mingw?

I thought it is...

Actually I was able to create the win32 version of mingw under
linux using a slightly modified version of "this script".

> I've attempted to do everything from scratch so I don't screw anything=20
> up, but obviously something is still not right.  Is it the linux=20
> crosscompiler i built?  Ideas?

You could try to tweak the configure switches of the compiler
in the script. Mail me privately and I'm happy to help sorting
that out.

Best,
Michael
=2D-=20
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 Michael Gerdau       email: mg...@te...
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