[PATCH] Fix c-c++-common/ubsan/overflow-negate-2.c

[Bernd Edlinger]

Hi,

this test case fails on ARM, because this target has by default unsigned char 
type.

Attached please find my proposed (almost obvious) fix for this,
by using signed char, instead of char alone.


Boot-Strapped and tested on X86_64 and ARM.


Thanks
Bernd.                                    

patch-overflow-negate-2.diff
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