RE: arm-wince-pe global constructors/ Qt (was Re: arm-wince-pe)

Hi again,

<warning>
long email.
</warning>

Citando "Keuchel, Rainer" <keuchel-ypdxL0zNX99Wk0Htik3J/[email protected]>:

> I think for making ctors in dlls work one has to add special
> init sections in the binary by modifying binutils, 
> but the order in which static ctors are called when
> using multiple dlls is kind of undefined, so they must not
> depend on each other.
 
Qt already builds as a dll on Mingw perfectly out of the box,
so I hope that most of the work should be done.

> When you could provide some sample for reproducing your
> problems I might take a look.
 
Here is a minimum test case for the uncalled global constructors with
arm-wince-pe from Mamaich's website case. I really don't know if this is solved
in more recent versions of gcc. I've heard that gcc from mainline is quite
broken for wince target, so I have not tried it yet.

---------------------

case 1:
arm-wince-pe-g++ glob_cons_test.cpp -o test_ccs.exe
fire gdb on it, type run.

case 2:
arm-wince-pe-g++ glob_cons_test.cpp -o test_ccs.exe -staticlibs

<cut here>

#include <windows.h>

struct test_ccs
{
	test_ccs() : a(20) {}
	int a;
};

// test data
static test_ccs glob_static;
test_ccs glob_extern;
int int_data = 20;
int int_bss;  // should print out zero if bss is being correcly initialized to zero

extern "C" void __gccmain();

void my_out_var(const WCHAR* pre, int num)
{
	WCHAR buf[300];
	wsprintf(buf, L"%s = %d (0x%x)\n", pre, num, num);
	OutputDebugStringW(buf);
}

#define OUT_VAR(X) my_out_var(TEXT(#X), X)

int WINAPI WinMain(HINSTANCE instance, HINSTANCE prevInstance, LPWSTR
/*wCmdParam*/, int cmdShow)
{
	// uncomment this to make global constructor work without -staticlibs
//	__gccmain();

	OutputDebugStringW(L"HELLO\n");

	static test_ccs func_static;

	OUT_VAR(int_data);
	OUT_VAR(int_bss);
	OUT_VAR(glob_extern.a);
	OUT_VAR(glob_static.a);
	OUT_VAR(func_static.a);

    return 0;
}


</cut here>

--------------------

case 1 results:

$ gdb test_ccs.exe
GNU gdb 5.2.1
Copyright 2002 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "--host=i686-pc-cygwin --target=arm-wince-pe"...
(no debugging symbols found)...
(gdb) run
Starting program: /cygdrive/d/Qt/4.0.0-mingw/examples/qpe/test_ccs.exe
Starting on device: "\gdb\wince-stub.exe \gdb\wince-stub.exe"
Waiting for connection...
d81000:libc.dll
3081000:iphlpapi.dll
3061000:ws2.dll
3071000:winsock.dll
7ffe1000:coredll.dll.0409.mui
1f61000:coredll.dll
warning: HELLO
warning: int_data = 20 (0x14)
warning: int_bss = 0 (0x0)
warning: glob_extern.a = 0 (0x0)
warning: glob_static.a = 0 (0x0)
warning: func_static.a = 20 (0x14)

Program exited normally.
(gdb)


case 2 results:

$ gdb test_ccs.exe
GNU gdb 5.2.1
Copyright 2002 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "--host=i686-pc-cygwin --target=arm-wince-pe"...
(no debugging symbols found)...
(gdb) run
Starting program: /cygdrive/d/Qt/4.0.0-mingw/examples/qpe/test_ccs.exe
Starting on device: "\gdb\wince-stub.exe \gdb\wince-stub.exe"
Waiting for connection...
3061000:ws2.dll
3071000:winsock.dll
7ffe1000:coredll.dll.0409.mui
1f61000:coredll.dll
warning: HELLO
warning: int_data = 20 (0x14)
warning: int_bss = 0 (0x0)
warning: glob_extern.a = 20 (0x14)
warning: glob_static.a = 20 (0x14)
warning: func_static.a = 20 (0x14)

Program exited normally.


-----------

on both cases, we can see that both bss and data are correctly initialized, and
also function statics contructors are being called.

on the first case however, glob_extern.a and glob_static.a print 0.
this means global constructors are not being called.

I've postponed this problem until latter. 
For the interested, I have ported minesweeper from qtopia to Qt4 wince, and it
works almost glitchless! I must say I am really excited about this!
I am now trying to set window styles correctly, and wondering what should I do
with the sip and the menubar.

Pedro Alves

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