don't include exception.hpp if CYBOZU_DONT_USE_EXCEPTION is defined

Makefile

@@ -335,7 +335,7 @@ ecdsa-wasm:
 bin/emu:
 	$(CXX) -g -o $@ src/fp.cpp src/bn_c256.cpp test/bn_c256_test.cpp -DMCL_DONT_USE_XBYAK -DMCL_DONT_USE_OPENSSL -DMCL_USE_VINT -DMCL_SIZEOF_UNIT=8 -DMCL_VINT_64BIT_PORTABLE -DMCL_VINT_FIXED_BUFFER -DMCL_MAX_BIT_SIZE=256 -I./include
 bin/pairing_c_min.exe: sample/pairing_c.c include/mcl/vint.hpp src/fp.cpp include/mcl/bn.hpp
-	$(CXX) -o $@ sample/pairing_c.c src/fp.cpp src/bn_c256.cpp -Og -g -I./include -fno-threadsafe-statics -DMCL_DONT_USE_XBYAK -DMCL_DONT_USE_OPENSSL -DMCL_USE_VINT -DMCL_SIZEOF_UNIT=8 -DMCL_VINT_FIXED_BUFFER -DMCL_MAX_BIT_SIZE=256 -DMCL_VINT_64BIT_PORTABLE #-DNDEBUG -DMCL_DONT_USE_CSPRNG
+	$(CXX) -o $@ sample/pairing_c.c src/fp.cpp src/bn_c256.cpp -O3 -g -I./include -fno-threadsafe-statics -DMCL_DONT_USE_XBYAK -DMCL_DONT_USE_OPENSSL -DMCL_USE_VINT -DMCL_SIZEOF_UNIT=8 -DMCL_VINT_FIXED_BUFFER -DMCL_MAX_BIT_SIZE=256 -DMCL_VINT_64BIT_PORTABLE -DCYBOZU_DONT_USE_STRING -DCYBOZU_DONT_USE_EXCEPTION -DNDEBUG # -DMCL_DONT_USE_CSPRNG
 
 make_tbl:
 	$(MAKE) ../bls/src/qcoeff-bn254.hpp

include/mcl/vint.hpp

@@ -2,7 +2,9 @@
 /**
 	emulate mpz_class
 */
+#ifndef CYBOZU_DONT_USE_EXCEPTION
 #include <cybozu/exception.hpp>
+#endif
 #include <cybozu/bit_operation.hpp>
 #include <cybozu/xorshift.hpp>
 #include <assert.h>