Make lbool explicitly signed
#650
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This avoids issues due to some platforms making `char` signed and others unsigned. In particular, on platforms where `char` is unsigned, https://github.com/lsils/mockturtle/blob/50ffa108484ba65b44eee4a713832b7ee821d6d8/lib/bill/bill/sat/interface/abc_bsat2.hpp#L156 promotes an `lbool` to `int` and compares to -1 ... but promoting `(unsigned char)-1` to `int` produces 255.`
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Verified correct behavior on experiments Thanks for catching the issue |
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This avoids issues due to some platforms making
charsigned and others unsigned. In particular, on platforms wherecharis unsigned,mockturtle/lib/bill/bill/sat/interface/abc_bsat2.hpp
Line 156 in 50ffa10
lbooltointand compares to -1 ... but promoting(unsigned char)-1tointproduces 255.