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To:	cygwin AT cygwin DOT com
From:	Thomas Wolff <towo AT towo DOT net>
Subject:	gcc 11 weird bug
Message-ID:	<248361fa-f16d-cebb-eefe-be78e09f4c10@towo.net>
Date:	Wed, 27 Oct 2021 11:19:00 +0200
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--------------30D4158897F42C92C2A22C2F
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I noticed that mintty did not compile anymore after upgrade to gcc 11, 
but only on cygwin 32-bit.
I tried to minimize the test case as much as possible without having the 
bug vanish, to the attached standalone file.
Compile this with
cc -O2 -Wall -Werror m0.c
and it gives a false positive warning about possible uninitialized data 
usage.
While data flow analysis is not perfect, it is weird that this used to 
happen on 32 bit but not on 64 bit.
Meanwhile, after updating some other packages (not sure which), but 
still the same gcc version, the report on the test case also happens on 
64 bit, while the original, unstripped file, as part of mintty, still 
works without error on 64 bit, which is even weirder.
I have not yet had the opportunity to test this on Linux, sorry, so I'm 
reporting it here.
Thomas

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