Setup upb installation with cmake.

This installs a upb's static library, headers, and three protoc plugin binaries (upb, upbdefs, upb_minitable).  These will now be enabled by default, but can be disabled by setting protobuf_BUILD_LIBUPB=OFF.

To qualify this, we hook into our existing install test infrastructure which attempts to build and run our tests without any of the installation artifacts available from the source tree.  Public headers are deleted, and builds of exported libraries/binaries are disabled.

PiperOrigin-RevId: 617376961

.github/workflows/test_cpp.yml

@@ -108,7 +108,9 @@ jobs:
           command: >
             -c "set -ex;
             sccache -z;
-            cmake . -DWITH_PROTOC=/workspace/${{ steps.cross-compile.outputs.protoc }} -Dprotobuf_BUILD_CONFORMANCE=ON -DCMAKE_CXX_STANDARD=14 -Dprotobuf_WITH_ZLIB=OFF ${{ env.SCCACHE_CMAKE_FLAGS }};
+            cmake . -DWITH_PROTOC=/workspace/${{ steps.cross-compile.outputs.protoc }}
+            -Dprotobuf_BUILD_LIBUPB=OFF -Dprotobuf_BUILD_CONFORMANCE=ON -DCMAKE_CXX_STANDARD=14
+            -Dprotobuf_WITH_ZLIB=OFF ${{ env.SCCACHE_CMAKE_FLAGS }};
             cmake --build . --parallel 20;
             ctest --parallel 20;
             sccache -s"
@@ -151,7 +153,7 @@ jobs:
           command: >-
             /test.sh ${{ matrix.flags}} ${{ env.SCCACHE_CMAKE_FLAGS }}
             -Dprotobuf_BUILD_TESTS=ON -Dprotobuf_USE_EXTERNAL_GTEST=ON
-            -Dprotobuf_ABSL_PROVIDER=package -Dprotobuf_BUILD_LIBUPB=ON
+            -Dprotobuf_ABSL_PROVIDER=package
 
   linux-cmake-install:
     name: Linux CMake Install
@@ -175,7 +177,9 @@ jobs:
           image: us-docker.pkg.dev/protobuf-build/containers/test/linux/cmake:3.13.3-63dd26c0c7a808d92673a3e52e848189d4ab0f17
           credentials: ${{ secrets.GAR_SERVICE_ACCOUNT }}
           command: >-
-            /install.sh -DCMAKE_CXX_STANDARD=14 ${{ env.SCCACHE_CMAKE_FLAGS }} -Dprotobuf_USE_EXTERNAL_GTEST=ON -Dprotobuf_ABSL_PROVIDER=package -Dprotobuf_BUILD_SHARED_LIBS=ON \&\&
+            /install.sh -DCMAKE_CXX_STANDARD=14 ${{ env.SCCACHE_CMAKE_FLAGS }}
+            -Dprotobuf_USE_EXTERNAL_GTEST=ON -Dprotobuf_ABSL_PROVIDER=package
+            -Dprotobuf_BUILD_SHARED_LIBS=ON \&\&
             /test.sh
             ${{ env.SCCACHE_CMAKE_FLAGS }}
             -Dprotobuf_REMOVE_INSTALLED_HEADERS=ON
@@ -250,7 +254,7 @@ jobs:
               -c 'set -ex;
               cd /workspace;
               sccache -z;
-              cmake . -Dprotobuf_BUILD_LIBUPB=ON ${{ matrix.flags }} ${{ env.SCCACHE_CMAKE_FLAGS }};
+              cmake . ${{ matrix.flags }} ${{ env.SCCACHE_CMAKE_FLAGS }};
               cmake --build . --parallel 20;
               ctest --verbose --parallel 20;
               sccache -s'
@@ -278,7 +282,7 @@ jobs:
           credentials: ${{ secrets.GAR_SERVICE_ACCOUNT }}
           command: >-
             /test.sh ${{ env.SCCACHE_CMAKE_FLAGS }}
-            -Dprotobuf_BUILD_CONFORMANCE=ON -Dprotobuf_BUILD_EXAMPLES=ON -DCMAKE_CXX_STANDARD=14 -Dprotobuf_BUILD_LIBUPB=ON
+            -Dprotobuf_BUILD_CONFORMANCE=ON -Dprotobuf_BUILD_EXAMPLES=ON -DCMAKE_CXX_STANDARD=14
 
   linux-cmake-32-bit:
     name: Linux CMake 32-bit
@@ -306,7 +310,7 @@ jobs:
               /bin/bash -cex '
               cd /workspace;
               sccache -z;
-              cmake . -DCMAKE_CXX_STANDARD=14 -Dprotobuf_BUILD_LIBUPB=ON ${{ env.SCCACHE_CMAKE_FLAGS }};
+              cmake . -DCMAKE_CXX_STANDARD=14 ${{ env.SCCACHE_CMAKE_FLAGS }};
               cmake --build . --parallel 20;
               ctest --verbose --parallel 20;
               sccache -s'
@@ -370,7 +374,7 @@ jobs:
             flags: >-
               -G Ninja -Dprotobuf_WITH_ZLIB=OFF -Dprotobuf_BUILD_CONFORMANCE=OFF
               -Dprotobuf_BUILD_SHARED_LIBS=OFF
-              -Dprotobuf_BUILD_EXAMPLES=ON -Dprotobuf_BUILD_LIBUPB=ON
+              -Dprotobuf_BUILD_EXAMPLES=ON
             vsversion: '2022'
             cache-prefix: windows-2022-cmake
           - name: Windows CMake 2019
@@ -378,7 +382,7 @@ jobs:
             flags: >-
               -G Ninja -Dprotobuf_WITH_ZLIB=OFF -Dprotobuf_BUILD_CONFORMANCE=OFF
               -Dprotobuf_BUILD_SHARED_LIBS=OFF
-              -Dprotobuf_BUILD_EXAMPLES=ON -Dprotobuf_BUILD_LIBUPB=ON
+              -Dprotobuf_BUILD_EXAMPLES=ON
             vsversion: '2019'
             cache-prefix: windows-2019-cmake
             # windows-2019 has python3.7 installed, which is incompatible with the latest gcloud
@@ -386,14 +390,14 @@ jobs:
           - name: Windows CMake 32-bit
             os: windows-2022
             flags: >-
-              -G Ninja -Dprotobuf_WITH_ZLIB=OFF -Dprotobuf_BUILD_CONFORMANCE=OFF -Dprotobuf_BUILD_LIBUPB=ON
+              -G Ninja -Dprotobuf_WITH_ZLIB=OFF -Dprotobuf_BUILD_CONFORMANCE=OFF
             vsversion: '2022'
             windows-arch: 'win32'
             cache-prefix: windows-2022-win32-cmake
           - name: Windows CMake Shared
             os: windows-2022
             flags: >-
-              -G Ninja -Dprotobuf_WITH_ZLIB=OFF -Dprotobuf_BUILD_CONFORMANCE=OFF -Dprotobuf_BUILD_LIBUPB=ON
+              -G Ninja -Dprotobuf_WITH_ZLIB=OFF -Dprotobuf_BUILD_CONFORMANCE=OFF
               -Dprotobuf_BUILD_SHARED_LIBS=ON
             vsversion: '2022'
             cache-prefix: windows-2022-cmake

CMakeLists.txt

@@ -31,7 +31,7 @@ option(protobuf_BUILD_EXAMPLES "Build examples" OFF)
 option(protobuf_BUILD_PROTOBUF_BINARIES "Build protobuf libraries and protoc compiler" ON)
 option(protobuf_BUILD_PROTOC_BINARIES "Build libprotoc and protoc compiler" ON)
 option(protobuf_BUILD_LIBPROTOC "Build libprotoc" OFF)
-option(protobuf_BUILD_LIBUPB "Build libupb" OFF)
+option(protobuf_BUILD_LIBUPB "Build libupb" ON)
 option(protobuf_DISABLE_RTTI "Remove runtime type information in the binaries" OFF)
 option(protobuf_TEST_XML_OUTDIR "Output directory for XML logs from tests." "")
 option(protobuf_ALLOW_CCACHE "Adjust build flags to allow for ccache support." OFF)
@@ -316,10 +316,10 @@ if (protobuf_BUILD_PROTOBUF_BINARIES)
   endif ()
   if (protobuf_BUILD_LIBUPB)
     include(${protobuf_SOURCE_DIR}/cmake/libupb.cmake)
-    include(${protobuf_SOURCE_DIR}/cmake/upb_generators.cmake)
     if (NOT DEFINED protobuf_LIB_UPB)
       set(protobuf_LIB_UPB libupb)
     endif ()
+    include(${protobuf_SOURCE_DIR}/cmake/upb_generators.cmake)
   endif ()
   if (protobuf_BUILD_PROTOC_BINARIES)
     include(${protobuf_SOURCE_DIR}/cmake/protoc.cmake)
@@ -334,6 +334,7 @@ else ()
     set(protobuf_LIB_PROTOC protobuf::libprotoc)
     set(protobuf_LIB_PROTOBUF protobuf::libprotobuf)
     set(protobuf_LIB_PROTOBUF_LITE protobuf::libprotobuf-lite)
+    set(protobuf_LIB_UPB protobuf::libupb)
     message(STATUS "CMake installation of Protobuf found.")
   endif ()
 endif ()

cmake/install.cmake

@@ -29,12 +29,11 @@ set(_protobuf_libraries libprotobuf-lite libprotobuf)
 if (protobuf_BUILD_LIBPROTOC)
     list(APPEND _protobuf_libraries libprotoc)
 endif (protobuf_BUILD_LIBPROTOC)
+if (protobuf_BUILD_LIBUPB)
+  list(APPEND _protobuf_libraries libupb)
+endif ()
 
 foreach(_library ${_protobuf_libraries})
-  set_property(TARGET ${_library}
-    PROPERTY INTERFACE_INCLUDE_DIRECTORIES
-    $<BUILD_INTERFACE:${protobuf_SOURCE_DIR}/src>
-    $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
   if (UNIX AND NOT APPLE)
     set_property(TARGET ${_library}
       PROPERTY INSTALL_RPATH "$ORIGIN")
@@ -49,16 +48,27 @@ foreach(_library ${_protobuf_libraries})
 endforeach()
 
 if (protobuf_BUILD_PROTOC_BINARIES)
+  set(_protobuf_binaries protoc)
   install(TARGETS protoc EXPORT protobuf-targets
     RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT protoc
     BUNDLE DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT protoc)
-  if (UNIX AND NOT APPLE)
-    set_property(TARGET protoc
-      PROPERTY INSTALL_RPATH "$ORIGIN/../${CMAKE_INSTALL_LIBDIR}")
-  elseif (APPLE)
-    set_property(TARGET protoc
-      PROPERTY INSTALL_RPATH "@loader_path/../lib")
-  endif()
+  if (protobuf_BUILD_LIBUPB)
+    foreach (generator upb upbdefs upb_minitable)
+      list(APPEND _protobuf_binaries protoc-gen-${generator})
+      install(TARGETS protoc-gen-${generator} EXPORT protobuf-targets
+        RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT upb-generators
+        BUNDLE DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT upb-generators)
+    endforeach ()
+  endif ()
+  foreach (binary IN LISTS _protobuf_binaries)
+    if (UNIX AND NOT APPLE)
+      set_property(TARGET ${binary}
+        PROPERTY INSTALL_RPATH "$ORIGIN/../${CMAKE_INSTALL_LIBDIR}")
+    elseif (APPLE)
+      set_property(TARGET ${binary}
+        PROPERTY INSTALL_RPATH "@loader_path/../lib")
+    endif ()
+  endforeach ()
 endif (protobuf_BUILD_PROTOC_BINARIES)
 
 install(FILES ${CMAKE_CURRENT_BINARY_DIR}/protobuf.pc ${CMAKE_CURRENT_BINARY_DIR}/protobuf-lite.pc DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
@@ -73,6 +83,17 @@ set(protobuf_HEADERS
   ${plugin_proto_proto_srcs}
   ${java_features_proto_proto_srcs}
 )
+if (protobuf_BUILD_LIBUPB)
+  list(APPEND protobuf_HEADERS ${libupb_hdrs})
+  # Manually install the bootstrap headers
+  install(
+    FILES
+      ${protobuf_SOURCE_DIR}/upb/reflection/cmake/google/protobuf/descriptor.upb.h
+      ${protobuf_SOURCE_DIR}/upb/reflection/cmake/google/protobuf/descriptor.upb_minitable.h
+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/google/protobuf
+    COMPONENT protobuf-headers
+  )
+endif ()
 foreach(_header ${protobuf_HEADERS})
   string(FIND ${_header} "${protobuf_SOURCE_DIR}/src" _find_src)
   string(FIND ${_header} "${protobuf_SOURCE_DIR}" _find_nosrc)

cmake/libprotobuf-lite.cmake

@@ -23,7 +23,10 @@ endif()
 if(${CMAKE_SYSTEM_NAME} STREQUAL "Android")
   target_link_libraries(libprotobuf-lite PRIVATE log)
 endif()
-target_include_directories(libprotobuf-lite PUBLIC ${protobuf_SOURCE_DIR}/src)
+target_include_directories(libprotobuf-lite PUBLIC
+  $<BUILD_INTERFACE:${protobuf_SOURCE_DIR}/src>
+  $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+)
 target_link_libraries(libprotobuf-lite PUBLIC ${protobuf_ABSL_USED_TARGETS})
 protobuf_configure_target(libprotobuf-lite)
 if(protobuf_BUILD_SHARED_LIBS)

cmake/libprotobuf.cmake

@@ -26,7 +26,10 @@ endif()
 if(${CMAKE_SYSTEM_NAME} STREQUAL "Android")
   target_link_libraries(libprotobuf PRIVATE log)
 endif()
-target_include_directories(libprotobuf PUBLIC ${protobuf_SOURCE_DIR}/src)
+target_include_directories(libprotobuf PUBLIC
+  $<BUILD_INTERFACE:${protobuf_SOURCE_DIR}/src>
+  $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+)
 target_link_libraries(libprotobuf PUBLIC ${protobuf_ABSL_USED_TARGETS})
 protobuf_configure_target(libprotobuf)
 if(protobuf_BUILD_SHARED_LIBS)

cmake/libupb.cmake

@@ -20,7 +20,10 @@ add_library(libupb STATIC
   ${protobuf_version_rc_file}
 )
 
-target_include_directories(libupb PUBLIC ${bootstrap_cmake_dir})
+target_include_directories(libupb PUBLIC
+  $<BUILD_INTERFACE:${bootstrap_cmake_dir}>
+  $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+)
 
 protobuf_configure_target(libupb)
 

cmake/tests.cmake

@@ -206,8 +206,8 @@ if (protobuf_BUILD_LIBUPB)
         OUT_VAR pb_generated_files
         IMPORT_DIRS ${protobuf_SOURCE_DIR}/src
         IMPORT_DIRS ${protobuf_SOURCE_DIR}
-        PLUGIN protoc-gen-${generator}=$<TARGET_FILE:protoc-gen-${generator}>
-        DEPENDENCIES $<TARGET_FILE:protoc-gen-${generator}>
+        PLUGIN protoc-gen-${generator}=$<TARGET_FILE:protobuf::protoc-gen-${generator}>
+        DEPENDENCIES $<TARGET_FILE:protobuf::protoc-gen-${generator}>
       )
       set(upb_test_proto_genfiles ${upb_test_proto_genfiles} ${pb_generated_files})
     endforeach()
@@ -219,8 +219,8 @@ if (protobuf_BUILD_LIBUPB)
     ${upb_test_util_files})
 
   target_link_libraries(upb-test
-    libprotobuf
-    libupb
+    ${protobuf_LIB_PROTOBUF}
+    ${protobuf_LIB_UPB}
     ${protobuf_ABSL_USED_TARGETS}
     ${protobuf_ABSL_USED_TEST_TARGETS}
     GTest::gmock_main)
@@ -239,7 +239,9 @@ add_custom_target(restore-installed-headers)
 
 file(GLOB_RECURSE _local_hdrs
   "${PROJECT_SOURCE_DIR}/src/*.h"
-  "${PROJECT_SOURCE_DIR}/src/*.inc")
+  "${PROJECT_SOURCE_DIR}/src/*.inc"
+  "${PROJECT_SOURCE_DIR}/upb/*.h"
+)
 
 # Exclude the bootstrapping that are directly used by tests.
 set(_exclude_hdrs
@@ -250,7 +252,7 @@ set(_exclude_hdrs
 
 # Exclude test library headers.
 list(APPEND _exclude_hdrs ${test_util_hdrs} ${lite_test_util_hdrs} ${common_test_hdrs}
-  ${compiler_test_utils_hdrs})
+  ${compiler_test_utils_hdrs} ${upb_test_util_files})
 foreach(_hdr ${_exclude_hdrs})
   list(REMOVE_ITEM _local_hdrs ${_hdr})
 endforeach()

cmake/upb_generators.cmake

@@ -14,11 +14,12 @@ foreach(generator upb upbdefs upb_minitable)
     ${bootstrap_sources}
     ${protobuf_version_rc_file}
   )
-  target_include_directories(protoc-gen-${generator} PUBLIC ${bootstrap_cmake_dir})
+  target_include_directories(protoc-gen-${generator} PRIVATE ${bootstrap_cmake_dir})
   target_link_libraries(protoc-gen-${generator}
-    libprotobuf
-    libupb
+    ${protobuf_LIB_PROTOBUF}
+    ${protobuf_LIB_UPB}
     ${protobuf_ABSL_USED_TARGETS}
   )
   set_target_properties(protoc-gen-${generator} PROPERTIES VERSION ${protobuf_VERSION})
+  add_executable(protobuf::protoc-gen-${generator} ALIAS protoc-gen-${generator})
 endforeach()

pkg/BUILD.bazel

@@ -208,6 +208,7 @@ cc_dist_library(
     name = "upb",
     tags = ["manual"],
     deps = [
+        "//upb:generated_code_support__only_for_generated_code_do_not_use__i_give_permission_to_break_me",
         "//upb/json",
         "//upb/message:compare",
         "//upb/message:copy",