Make CMake always build test protos into a static library

When building with `-Dprotobuf_BUILD_SHARED_LIBS=ON`, we currently put all test
protos into their own shared library. PR #15887 seems to be pushing us over a
limit on the number of exported symbols so that this library no longer links
successfully, though.

This change fixes that problem by always building the test protos into a static
library. This should be fine since it's purely for testing and not meant to be
installed. The only things that depend on it are executables, so we don't need
to worry about ODR violations.

PiperOrigin-RevId: 617929396

cmake/conformance.cmake

@@ -12,11 +12,6 @@ elseif(protobuf_JSONCPP_PROVIDER STREQUAL "package")
   find_package(jsoncpp REQUIRED)
 endif()
 
-set(protoc_cpp_args)
-if (protobuf_BUILD_SHARED_LIBS)
-  set(protoc_cpp_args "dllexport_decl=PROTOBUF_TEST_EXPORTS:")
-endif ()
-
 file(MAKE_DIRECTORY ${protobuf_BINARY_DIR}/conformance)
 
 add_custom_command(
@@ -26,7 +21,7 @@ add_custom_command(
   DEPENDS ${protobuf_PROTOC_EXE} ${protobuf_SOURCE_DIR}/conformance/conformance.proto
   COMMAND ${protobuf_PROTOC_EXE} ${protobuf_SOURCE_DIR}/conformance/conformance.proto
       --proto_path=${protobuf_SOURCE_DIR}/conformance
-      --cpp_out=${protoc_cpp_args}${protobuf_BINARY_DIR}/conformance
+      --cpp_out=${protobuf_BINARY_DIR}/conformance
 )
 
 file(MAKE_DIRECTORY ${protobuf_BINARY_DIR}/src)
@@ -52,10 +47,10 @@ add_custom_command(
               ${protobuf_SOURCE_DIR}/src/google/protobuf/editions/golden/test_messages_proto3_editions.proto
               ${protobuf_SOURCE_DIR}/src/google/protobuf/editions/golden/test_messages_proto2_editions.proto
             --proto_path=${protobuf_SOURCE_DIR}/src
-            --cpp_out=${protoc_cpp_args}${protobuf_BINARY_DIR}/src
+            --cpp_out=${protobuf_BINARY_DIR}/src
 )
 
-add_library(libconformance_common ${protobuf_SHARED_OR_STATIC}
+add_library(libconformance_common STATIC
   ${protobuf_BINARY_DIR}/conformance/conformance.pb.h
   ${protobuf_BINARY_DIR}/conformance/conformance.pb.cc
   ${protobuf_BINARY_DIR}/src/google/protobuf/test_messages_proto2.pb.h
@@ -71,11 +66,6 @@ target_link_libraries(libconformance_common
   ${protobuf_LIB_PROTOBUF}
   ${protobuf_ABSL_USED_TARGETS}
 )
-if(protobuf_BUILD_SHARED_LIBS)
-  target_compile_definitions(libconformance_common
-    PUBLIC  PROTOBUF_USE_DLLS
-    PRIVATE LIBPROTOBUF_TEST_EXPORTS)
-endif()
 
 add_executable(conformance_test_runner
   ${protobuf_SOURCE_DIR}/conformance/binary_json_conformance_suite.cc

cmake/tests.cmake

@@ -18,11 +18,6 @@ set(tests_protos
   ${util_test_protos_files}
 )
 
-set(protoc_cpp_args)
-if (protobuf_BUILD_SHARED_LIBS)
-  set(protoc_cpp_args "dllexport_decl=PROTOBUF_TEST_EXPORTS")
-endif ()
-
 file(MAKE_DIRECTORY ${protobuf_BINARY_DIR}/src)
 
 set(lite_test_proto_files)
@@ -32,23 +27,17 @@ foreach(proto_file ${lite_test_protos})
     LANGUAGE cpp
     OUT_VAR pb_generated_files
     IMPORT_DIRS ${protobuf_SOURCE_DIR}/src
-    PLUGIN_OPTIONS ${protoc_cpp_args}
   )
   set(lite_test_proto_files ${lite_test_proto_files} ${pb_generated_files})
 endforeach(proto_file)
 
 set(tests_proto_files)
 foreach(proto_file ${tests_protos})
-  if (MSVC AND protobuf_BUILD_SHARED_LIBS AND ${proto_file} MATCHES ".*enormous.*")
-    # Our enormous protos are too big for windows DLLs.
-    continue()
-  endif ()
   protobuf_generate(
     PROTOS ${proto_file}
     LANGUAGE cpp
     OUT_VAR pb_generated_files
     IMPORT_DIRS ${protobuf_SOURCE_DIR}/src
-    PLUGIN_OPTIONS ${protoc_cpp_args}
   )
   set(tests_proto_files ${tests_proto_files} ${pb_generated_files})
 endforeach(proto_file)
@@ -96,7 +85,7 @@ else()
   set(protobuf_GTEST_ARGS)
 endif()
 
-add_library(libtest_common ${protobuf_SHARED_OR_STATIC}
+add_library(libtest_common STATIC
   ${tests_proto_files}
 )
 target_link_libraries(libtest_common
@@ -109,11 +98,6 @@ target_link_libraries(libtest_common
 if (MSVC)
   target_compile_options(libtest_common PRIVATE /bigobj)
 endif ()
-if(protobuf_BUILD_SHARED_LIBS)
-  target_compile_definitions(libtest_common
-    PUBLIC  PROTOBUF_USE_DLLS
-    PRIVATE LIBPROTOBUF_TEST_EXPORTS)
-endif()
 
 add_executable(tests ${tests_files} ${common_test_files})
 if (MSVC)
@@ -155,7 +139,7 @@ target_link_libraries(test_plugin
   GTest::gmock
 )
 
-add_library(libtest_common_lite ${protobuf_SHARED_OR_STATIC}
+add_library(libtest_common_lite STATIC
   ${lite_test_proto_files}
 )
 target_link_libraries(libtest_common_lite
@@ -163,11 +147,6 @@ target_link_libraries(libtest_common_lite
   ${protobuf_ABSL_USED_TARGETS}
   GTest::gmock
 )
-if(protobuf_BUILD_SHARED_LIBS)
-  target_compile_definitions(libtest_common_lite
-    PUBLIC  PROTOBUF_USE_DLLS
-    PRIVATE LIBPROTOBUF_TEST_EXPORTS)
-endif()
 
 add_executable(lite-test
   ${protobuf_lite_test_files}

src/google/protobuf/port_def.inc

@@ -367,18 +367,6 @@ static_assert(PROTOBUF_ABSL_MIN(20230125, 3),
 # define PROTOC_EXPORT
 #endif
 
-#if defined(PROTOBUF_USE_DLLS) && defined(_MSC_VER)
-# if defined(LIBPROTOBUF_TEST_EXPORTS)
-#  define PROTOBUF_TEST_EXPORTS __declspec(dllexport)
-# else
-#  define PROTOBUF_TEST_EXPORTS __declspec(dllimport)
-# endif  // defined(LIBPROTOBUF_TEST_EXPORTS)
-#elif defined(PROTOBUF_USE_DLLS) && defined(LIBPROTOBUF_TEST_EXPORTS)
-# define PROTOBUF_TEST_EXPORTS __attribute__((visibility("default")))
-#else
-# define PROTOBUF_TEST_EXPORTS
-#endif
-
 #if defined(PROTOBUF_PREDICT_TRUE) || defined(PROTOBUF_PREDICT_FALSE)
 #error PROTOBUF_PREDICT_(TRUE|FALSE) was previously defined
 #endif