jvanstraten commented on a change in pull request #12457:
URL: https://github.com/apache/arrow/pull/12457#discussion_r814317387
##########
File path: cpp/cmake_modules/ThirdpartyToolchain.cmake
##########
@@ -1605,6 +1623,87 @@ if(ARROW_WITH_PROTOBUF)
message(STATUS "Found protobuf headers: ${PROTOBUF_INCLUDE_DIR}")
endif()
+# ----------------------------------------------------------------------
+# Substrait (required by compute engine)
+
+macro(build_substrait)
+ message("Building Substrait from source")
+
+ set(SUBSTRAIT_PROTOS
+ capabilities
+ expression
+ extensions/extensions
+ function
+ parameterized_types
+ plan
+ relations
+ type
+ type_expressions)
+
+ externalproject_add(substrait_ep
+ CONFIGURE_COMMAND ""
+ BUILD_COMMAND ""
+ INSTALL_COMMAND ""
+ URL ${SUBSTRAIT_SOURCE_URL}
+ URL_HASH
"SHA256=${ARROW_SUBSTRAIT_BUILD_SHA256_CHECKSUM}")
+
+ externalproject_get_property(substrait_ep SOURCE_DIR)
+ set(SUBSTRAIT_LOCAL_DIR ${SOURCE_DIR})
+
+ set(SUBSTRAIT_CPP_DIR "${CMAKE_CURRENT_BINARY_DIR}/substrait_ep-generated")
+
+ set(SUBSTRAIT_SUPPRESSED_WARNINGS)
+ if(MSVC)
+ # Protobuf generated files trigger some spurious warnings on MSVC.
+
+ # Implicit conversion from uint64_t to uint32_t:
+ list(APPEND SUBSTRAIT_SUPPRESSED_WARNINGS "/wd4244")
+
+ # Missing dll-interface:
+ list(APPEND SUBSTRAIT_SUPPRESSED_WARNINGS "/wd4251")
+ endif()
+
+ set(SUBSTRAIT_SOURCES)
+ set(SUBSTRAIT_PROTO_GEN_ALL)
+ foreach(SUBSTRAIT_PROTO ${SUBSTRAIT_PROTOS})
+ set(SUBSTRAIT_PROTO_GEN
"${SUBSTRAIT_CPP_DIR}/substrait/${SUBSTRAIT_PROTO}.pb")
+
+ foreach(EXT h cc)
+ set_source_files_properties("${SUBSTRAIT_PROTO_GEN}.${EXT}"
+ PROPERTIES COMPILE_OPTIONS
+ "${SUBSTRAIT_SUPPRESSED_WARNINGS}"
+ GENERATED TRUE
+ SKIP_UNITY_BUILD_INCLUSION TRUE)
+ add_custom_command(OUTPUT "${SUBSTRAIT_PROTO_GEN}.${EXT}"
+ COMMAND ${ARROW_PROTOBUF_PROTOC}
"-I${SUBSTRAIT_LOCAL_DIR}/proto"
+ "--cpp_out=${SUBSTRAIT_CPP_DIR}"
+
"${SUBSTRAIT_LOCAL_DIR}/proto/substrait/${SUBSTRAIT_PROTO}.proto"
+ DEPENDS ${PROTO_DEPENDS} substrait_ep)
Review comment:
No, probably not. I noticed it too when I inherited this code, but
incorrectly assumed it was written like that because `add_custom_command` only
supported a single output file. 7ad2e1f
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