feat: Make main target installable.

This allows to run `cmake --install .` to install the project to a
system such that it can be consumed with `find_package()`. This required
the following changes:

* Include all targets in the `install(TARGETS ...)` command.
* Export these targets to an export set.
* `install(EXPORT ...)` that export set.
* Provide install-time paths for several `target_include_directories()`,
  some of which are empty because the headers are not installed.

src/substrait/CMakeLists.txt

@@ -18,9 +18,9 @@ set(CMAKE_RUNTIME_OUTPUT_DIRECTORY
 set(ADDITIONAL_CLEAN_FILES
  "${CMAKE_ARCHIVE_OUTPUT_DIRECTORY};${CMAKE_RUNTIME_OUTPUT_DIRECTORY}")
 
-add_subdirectory(common)
 add_subdirectory(type)
 add_subdirectory(expression)
 add_subdirectory(function)
 add_subdirectory(proto)
 add_subdirectory(textplan)
+add_subdirectory(common)

src/substrait/common/CMakeLists.txt

@@ -24,9 +24,23 @@ if(${SUBSTRAIT_CPP_BUILD_TESTING})
  add_subdirectory(tests)
 endif()
 
-install(TARGETS substrait_io LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})
+install(
+ TARGETS substrait_io
+ substrait_common
+ substrait_proto
+ substrait_textplan_converter
+ substrait_textplan_loader
+ substrait_base_proto_visitor
+ symbol_table
+ error_listener
+ substrait_type
+ substrait_expression
+ textplan_grammar
+ DESTINATION ${CMAKE_INSTALL_LIBDIR}
+ EXPORT SubstraitTargets)
 install(FILES ../../../include/substrait/common/Io.h
  DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/substrait/common")
+install(EXPORT SubstraitTargets DESTINATION lib/cmake/Substrait)
 
 add_executable(plantransformer PlanTransformerTool.cpp)
 

src/substrait/proto/CMakeLists.txt

@@ -86,5 +86,7 @@ target_link_libraries(substrait_proto protobuf::libprotobuf)
 # Make sure we can see our own generated include files.
 target_include_directories(
  substrait_proto
- PUBLIC "${PROTO_OUTPUT_TOPLEVEL_DIR}/src"
- PUBLIC "${protobuf_SOURCE_DIR}/src")
+ PUBLIC $<BUILD_INTERFACE:${PROTO_OUTPUT_TOPLEVEL_DIR}/src>
+ $<INSTALL_INTERFACE:include>
+ PUBLIC $<BUILD_INTERFACE:${protobuf_SOURCE_DIR}/src>
+ $<INSTALL_INTERFACE:include>)

src/substrait/textplan/CMakeLists.txt

@@ -36,8 +36,8 @@ target_link_libraries(
  date::date)
 
 # Provide access to the generated protobuffer headers hierarchy.
-target_include_directories(symbol_table
-  PUBLIC "${CMAKE_CURRENT_BINARY_DIR}/../..")
+target_include_directories(
+ symbol_table PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/../..>)
 
 if(${SUBSTRAIT_CPP_BUILD_TESTING})
  add_subdirectory(tests)

src/substrait/textplan/parser/grammar/CMakeLists.txt

@@ -55,7 +55,8 @@ add_library(textplan_grammar ${ANTLR_SubstraitPlanLexer_CXX_OUTPUTS}
 
 message(STATUS "generated dir: ${GRAMMAR_DIR}/antlr4cpp_generated_src")
 
-target_include_directories(textplan_grammar
- PUBLIC "${GRAMMAR_DIR}/antlr4cpp_generated_src")
+target_include_directories(
+ textplan_grammar
+ PUBLIC $<BUILD_INTERFACE:${GRAMMAR_DIR}/antlr4cpp_generated_src>)
 
 target_link_libraries(textplan_grammar antlr4_static)