DO NOT MERGE -- ccache test

Will be undone.

Author: petr-bauch

.travis.yml

@@ -352,10 +352,10 @@ script:
   - if [ -e bin/gcc ] ; then export PATH=$PWD/bin:$PATH ; fi ;
   - env UBSAN_OPTIONS=print_stacktrace=1 make -C regression test-parallel "CXX=${COMPILER} ${EXTRA_CXXFLAGS}" -j2 JOBS=2
   - UBSAN_OPTIONS=print_stacktrace=1 make -C regression/cbmc test-paths-lifo
-  - env PATH=$PATH:`pwd`/src/solvers UBSAN_OPTIONS=print_stacktrace=1 make -C regression/cbmc test-cprover-smt2
+#  - env PATH=$PATH:`pwd`/src/solvers UBSAN_OPTIONS=print_stacktrace=1 make -C regression/cbmc test-cprover-smt2
   - make -C unit "CXX=${COMPILER} ${EXTRA_CXXFLAGS}" -j2
   - make -C unit test
-  - env UBSAN_OPTIONS=print_stacktrace=1 make -C jbmc/regression test-parallel "CXX=${COMPILER} ${EXTRA_CXXFLAGS}" -j2 JOBS=2
+#  - env UBSAN_OPTIONS=print_stacktrace=1 make -C jbmc/regression test-parallel "CXX=${COMPILER} ${EXTRA_CXXFLAGS}" -j2 JOBS=2
   - make -C jbmc/unit "CXX=${COMPILER} ${EXTRA_CXXFLAGS}" -j2
   - make -C jbmc/unit test