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May I should also try GCC 4.4.3 instead of 4.4.7

Oki, r12391 with GCC 4.4.3 compiled and the cdimono1 driver work on WinXP 32-bit.
So I guess, the last official u2 Windows 32-bit build was compiled with GCC 4.4.7

and no, I will not change my OS

Regarding cdimono1.. as far as I have been able to determine it is indeed an issue with 4.4.7 (official tools) and related somehow the 68000 cpu emulation core. It's causing the following sets in mess to drop out very soon after starting. Another irritating issue is that if you make a debug build, there is no such crashing. I haven't tried to isolate what optimization flag is causing the corruptions, but I'm sure that's the issue.

All I get with symbols or stack is:
Stack crawl:
00000000: 77C3554A (abnormal_termination+0x0033)

Sets in MESS that are crashing:
3b1 - unixpc.c
cdimono1 - cdi.c
cgc7900 - cgc7900.c
jaguarcd - jaguar.c
megast_sg - atarist.c
megaste_es - atarist.c
megaste_it - atarist.c
nexttrb - next.c
palmm505 - palm.c
st_sg - atarist.c
visor - palm.c

I've been able to find a particular set which crashes very quickly to the point where you can open a regular build with a debugger and hit ENTER a set many times to trigger a crash. Hopefully someone with 68000/debugger knowledge might be able to use that information.

Start "visor" with -debug. Hit ENTER and step 33 times. On the 34th time, the game will always crash.

For what it's worth, there are a couple dozen mame sets which do the same thing. I can share that list with someone who is willing to look into this issue.

i'm still using the old tools, on xp 32bit, winui standard build, and none of those games crash - but only the cdimono1 looks like it might work.

3b1: 4 LEDs at the bottom, nothing more
cdimono1: appears to work but i have no software
cgc7900, jaguarcd: black screen
megast_sg, st_sg: row of bombs across a white screen, slowly flashing
megaste_es, megaste_it: a few small dots
nexttrb: stripes of random characters down the screen
palmm505, visor: greenish spew-coloured screen

Yes, none of the listed drivers ever actually worked aside from cdimono1

Did this happen with the toolchain switch (in which case Tafoid's about a year late bitching about it) or more recently? (e.g. cothreads, or OG and my changes to m68k)?

If you use the official 0.143 builds, how about that ?

cdimono1 runs fine with the official 32 and 64 bit 0.143u2 Windows binaries (OS Win7 Pro x64).

Yip that's what AnnaWu said

It must be something in the 4.4.7 toolchain on WinXP. Since I and Anna use the same OS and toolchain, and it crash. If you use 4.4.3 it doesn't. But anything above 4.4.7 gives you this error:

If you use the -verbose switch, you should see a few lines that say

<missing dependencies; rescheduling>

for me, cdimono1 says it 4 times, visor 3 times, 3b1 once.

Does that show for you?

Yes, I get 4 when running the cdimono1 driver. it then crash with: