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[CMake] Support inter-proto dependencies in generate_protos.

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Differential Revision: https://reviews.llvm.org/D90215
This commit is contained in:
Sam McCall 2020-10-27 10:58:34 +01:00
parent 37ac86abe6
commit f5391ec5cb
1 changed files with 22 additions and 1 deletions
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23
cmake/modules/FindGRPC.cmake
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@ -84,8 +84,10 @@ endif()
# Proto headers are generated in ${CMAKE_CURRENT_BINARY_DIR}.
# Libraries that use these headers should adjust the include path.
# If the "GRPC" argument is given, services are also generated.
# The DEPENDS list should name *.proto source files that are imported.
# They may be relative to the source dir or absolute (for generated protos).
function(generate_protos LibraryName ProtoFile)
cmake_parse_arguments(PARSE_ARGV 2 PROTO "GRPC" "" "")
cmake_parse_arguments(PARSE_ARGV 2 PROTO "GRPC" "" "DEPENDS")
get_filename_component(ProtoSourceAbsolutePath "${CMAKE_CURRENT_SOURCE_DIR}/${ProtoFile}" ABSOLUTE)
get_filename_component(ProtoSourcePath ${ProtoSourceAbsolutePath} PATH)
get_filename_component(Basename ${ProtoSourceAbsolutePath} NAME_WLE)
@ -111,4 +113,23 @@ function(generate_protos LibraryName ProtoFile)
add_clang_library(${LibraryName} ${GeneratedProtoSource}
PARTIAL_SOURCES_INTENDED
LINK_LIBS grpc++ protobuf)
# Ensure dependency headers are generated before dependent protos are built.
# DEPENDS arg is a list of "Foo.proto". While they're logically relative to
# the source dir, the generated headers we need are in the binary dir.
foreach(ImportedProto IN LISTS PROTO_DEPENDS)
# Foo.proto -> Foo.pb.h
STRING(REGEX REPLACE "\\.proto$" ".pb.h" ImportedHeader "${ImportedProto}")
# Foo.pb.h -> ${CMAKE_CURRENT_BINARY_DIR}/Foo.pb.h
get_filename_component(ImportedHeader "${ImportedHeader}"
ABSOLUTE
BASE_DIR "${CMAKE_CURRENT_BINARY_DIR}")
# Compilation of each generated source depends on ${BINARY}/Foo.pb.h.
foreach(Generated IN LISTS GeneratedProtoSource)
# FIXME: CMake docs suggest OBJECT_DEPENDS isn't needed, but I can't get
# the recommended add_dependencies() approach to work.
set_source_files_properties("${Generated}"
PROPERTIES OBJECT_DEPENDS "${ImportedHeader}")
endforeach(Generated)
endforeach(ImportedProto)
endfunction()