Refactor libsnark CMake config

CMakeLists.txt

@@ -51,7 +51,7 @@ include(deps/boost.cmake)
 include(deps/jsoncpp.cmake)
 include(deps/jsonrpc.cmake)
 include(deps/cryptopp.cmake)
-include(deps/snark.cmake)
+include(ProjectSnark)
 
 configure_project(CPUID CURL EVMJIT FATDB MINIUPNPC ROCKSDB PARANOID TESTS VMTRACE)
 

cmake/ProjectSnark.cmake

@@ -0,0 +1,28 @@
+include(ExternalProject)
+
+ExternalProject_Add(snark
+    PREFIX deps
+    # This points to a February 2017 version.
+    DOWNLOAD_NAME snark-6b7e494c.tar.gz
+    URL https://github.com/scipr-lab/libsnark/archive/6b7e494c2407eb8e91ad78635788decb2d736596.tar.gz
+    URL_HASH SHA256=c40ee69a15c8a5baf3980d3686112ccbe8511071faa1cda3875d43e693fc90e4
+    DOWNLOAD_NO_PROGRESS TRUE
+    BUILD_IN_SOURCE 1
+    CONFIGURE_COMMAND ""
+    BUILD_COMMAND CXX=${CMAKE_CXX_COMPILER} CC=${CMAKE_C_COMPILER} make
+        NO_PROCPS=1 STATIC=1 NO_SUPERCOP=1 NO_GTEST=1 NO_DOCS=1 CURVE=ALT_BN128
+        FEATUREFLAGS="-DBINARY_OUTPUT=1 -DMONTGOMERY_OUTPUT=1 -DNO_PT_COMPRESSION=1"
+        lib PREFIX=<INSTALL_DIR> install
+    INSTALL_COMMAND ""
+)
+
+# Create snark imported library
+ExternalProject_Get_Property(snark INSTALL_DIR)
+add_library(Snark STATIC IMPORTED)
+set(SNARK_LIBRARY ${INSTALL_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}snark${CMAKE_STATIC_LIBRARY_SUFFIX})
+file(MAKE_DIRECTORY ${INSTALL_DIR}/include/libsnark)  # Must exist.
+set(SNARK_INCLUDE_DIRS ${INSTALL_DIR}/include ${INSTALL_DIR}/include/libsnark)
+set_property(TARGET Snark PROPERTY IMPORTED_LOCATION ${SNARK_LIBRARY})
+set_property(TARGET Snark PROPERTY INTERFACE_INCLUDE_DIRECTORIES ${SNARK_INCLUDE_DIRS})
+add_dependencies(Snark snark)
+unset(INSTALL_DIR)

libdevcrypto/CMakeLists.txt

@@ -10,7 +10,7 @@ find_package(Utils)
 
 target_include_directories(devcrypto PRIVATE ..)
 target_include_directories(devcrypto PRIVATE ../utils)
-target_link_libraries(devcrypto cryptopp snark ${Utils_SCRYPT_LIBRARIES} devcore)
+target_link_libraries(devcrypto cryptopp Snark ${Utils_SCRYPT_LIBRARIES} devcore)
 
 if (NOT EMSCRIPTEN)
 	target_link_libraries(devcrypto ${Utils_SECP256K1_LIBRARIES})