This is intentional, more or less. The -D logfile is for the debug logs
enabled with -d, not for strace. I think if we wanted to support
redirecting strace output to a file we might need to have an extra
argument, to avoid breaking existing users.
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qemu-user option -strace -D <file> doesn't work
Status in QEMU:
I have been trying to access qemu -strace output from a script
The main problem was it was on stderr, the strace output was merged with my
program's stderr output.
Then I tried to use the -D option, to log the output to a file.
This didn't work even if the log file was created, but it was empty.
I have looked at the source code and found the print function was not
qemu_log with -strace but gemu_log (to be clear it was GEMU NOT QEMU)
I have then replaced all gemu_log by qemu_log removed declaration of gemu_log
and recompiled, it seems to works just fine right now.
removed declaration here and here:
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