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LFSC now lives outside of the CVC4 repository and is not part of the CVC4 distribution
anymore. As a consequence, we
+ Add --with-lfsc and --with-lfsc-directory as configure options.
In the case where CVC4 has not been built with integrated LFSC, all code that interacts with
LFSC is disabled.
+ Disable proof checking if CVC4_USE_LFSC is not defined.
Configuring the build with --check-proofs but without --with-lfsc results in an error.
+ Do not call LFSC's cleanup function (but we should in the future).
LFSC checker segfaults during cleanup on regression testcase regress0/bv/core/bitvec7.smt.
Disabled call to lfscc_cleanup until the problem in lfscc is fixed.
+ Disable building with LFSC for the distcheck travis build since it is not part of the distribution
anymore. Further, make distcheck with LFSC would require to call contrib/get-lfsc-checker
before calling make check on the temp build (the build of the unpacked distribution tar ball).
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The nightly competition build has been failing due to a remaining use of
hash_set in approx_simplex.cpp. This commit changes the remaining uses
of hash_set to unordered_set.
The remaining uses of hash_set were in LFSC. Switching to C++11 for LFSC
required changing the configure.ac for LFSC to require C++11 support to
make sure that it can be compiled independently from the rest of CVC4 (some
of our Travis tests do that as well). To have the macros for these additional
checks available, the commit adds a symlink to the files in config that contain
the macros). I did not find a way to add macros from a parent's folder that
did not break `make distcheck
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For certain proofs, the performance was drastically different on
different OSes. The cause for this difference was a pointer comparison
in the deduplication in `Expr::defeq()`. Depending on how the OS
allocated the memory, an expression `a` would get replaced with an
equivalent expression `b` or vice versa, which in turn affected
performance of `Expr::free_in()` dramatically (sub-second vs. >5 min
running times). This commit makes the process more deterministic by
using a heuristic that favors symbolic expressions and greedily tries to
make small refcounts smaller when replacing, and changes
`Expr::free_in()` to not repeatedly explore the same subexpressions.
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irrelevant quantifiers based on irrelevant functions. Fix rewriter for prefix merges. Minor optimizations for LFSC. Work on --literal-matching. Updates to inst propagate, move instantiation filtering within qe. Enable sygus for string inputs.
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