Make test build optional in CMake

CMakeLists.txt

@@ -1,18 +1,24 @@
 cmake_minimum_required(VERSION 2.6)
 
 set(SOURCES aescrypt.c aeskey.c aes_modes.c aestab.c base58.c bignum.c bip32.c bip39.c ecdsa.c hmac.c pbkdf2.c rand.c ripemd160.c secp256k1.c sha2.c)
+
+# disable sequence point warnings where they are expected
+set_source_files_properties(aeskey.c PROPERTIES
+                            COMPILE_FLAGS -Wno-sequence-point)
+
 if(MSVC)
   set_source_files_properties(${SOURCES} PROPERTIES LANGUAGE CXX)
 endif(MSVC)
+
 add_library(TrezorCrypto STATIC ${SOURCES})
 
-# disable sequence point warning because of AES code
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-sequence-point")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-sequence-point")
-add_executable(tests tests.c)
-target_link_libraries(tests TrezorCrypto check rt pthread m crypto)
-add_test(NAME trezor-crypto COMMAND tests)
+# Build trezor-crypto tests (requires OpenSSL)
+if (TREZOR_CRYPTO_TESTS)
+    add_executable(tests tests.c)
+    target_link_libraries(tests TrezorCrypto check rt pthread m crypto)
+    add_test(NAME trezor-crypto COMMAND tests)
 
-add_executable(test-openssl test-openssl.c)
-target_link_libraries(test-openssl TrezorCrypto check rt pthread m crypto)
-add_test(NAME trezor-crypto-openssl COMMAND test-openssl 100)
+    add_executable(test-openssl test-openssl.c)
+    target_link_libraries(test-openssl TrezorCrypto check rt pthread m crypto)
+    add_test(NAME trezor-crypto-openssl COMMAND test-openssl 100)
+endif()