Pass `-fopenmp` at compile-time to enable MULTICORE.

src/Makefile.am

@@ -416,7 +416,7 @@ libzcash_a_SOURCES = \
   zcash/prf.cpp \
   zcash/util.cpp
 
-libzcash_a_CPPFLAGS = -DMULTICORE -fPIC -DBINARY_OUTPUT -DCURVE_ALT_BN128 -DBOOST_SPIRIT_THREADSAFE -DHAVE_BUILD_INFO -D__STDC_FORMAT_MACROS $(HARDENED_CPPFLAGS) -pipe -O2 -O0 -g -Wstack-protector -fstack-protector-all -fPIE -fvisibility=hidden -DSTATIC $(BITCOIN_INCLUDES)
+libzcash_a_CPPFLAGS = -DMULTICORE -fopenmp -fPIC -DBINARY_OUTPUT -DCURVE_ALT_BN128 -DBOOST_SPIRIT_THREADSAFE -DHAVE_BUILD_INFO -D__STDC_FORMAT_MACROS $(HARDENED_CPPFLAGS) -pipe -O2 -O0 -g -Wstack-protector -fstack-protector-all -fPIE -fvisibility=hidden -DSTATIC $(BITCOIN_INCLUDES)
 
 # bitcoinconsensus library #
 if BUILD_BITCOIN_LIBS

src/Makefile.gtest.include

@@ -11,7 +11,7 @@ zcash_gtest_SOURCES = \
 	gtest/test_merkletree.cpp \
 	gtest/test_circuit.cpp
 
-zcash_gtest_CPPFLAGS = -DMULTICORE -DBINARY_OUTPUT -DCURVE_ALT_BN128 -DSTATIC
+zcash_gtest_CPPFLAGS = -DMULTICORE -fopenmp -DBINARY_OUTPUT -DCURVE_ALT_BN128 -DSTATIC
 
 zcash_gtest_LDADD = -lgtest $(LIBBITCOIN_SERVER) $(LIBBITCOIN_CLI) $(LIBBITCOIN_COMMON) $(LIBBITCOIN_UTIL) $(LIBBITCOIN_CRYPTO) $(LIBBITCOIN_UNIVALUE) $(LIBLEVELDB) $(LIBMEMENV) \
   $(BOOST_LIBS) $(BOOST_UNIT_TEST_FRAMEWORK_LIB) $(LIBSECP256K1)

src/Makefile.test.include

@@ -93,7 +93,7 @@ BITCOIN_TESTS += \
 endif
 
 test_test_bitcoin_SOURCES = $(BITCOIN_TESTS) $(JSON_TEST_FILES) $(RAW_TEST_FILES)
-test_test_bitcoin_CPPFLAGS = $(BITCOIN_INCLUDES) -I$(builddir)/test/ $(TESTDEFS)
+test_test_bitcoin_CPPFLAGS = -fopenmp $(BITCOIN_INCLUDES) -I$(builddir)/test/ $(TESTDEFS)
 test_test_bitcoin_LDADD = $(LIBBITCOIN_SERVER) $(LIBBITCOIN_CLI) $(LIBBITCOIN_COMMON) $(LIBBITCOIN_UTIL) $(LIBBITCOIN_CRYPTO) $(LIBBITCOIN_UNIVALUE) $(LIBLEVELDB) $(LIBMEMENV) \
   $(BOOST_LIBS) $(BOOST_UNIT_TEST_FRAMEWORK_LIB) $(LIBSECP256K1)
 if ENABLE_WALLET