Allow creation of shared library for libTink

This commit enable to cross compile the libTink by creating a shared library. Signed-off-by: Muhammad Usama <[email protected]>
tink-crypto · May 26, 2023 · 709d5f8 · 709d5f8
1 parent 005f36b
commit 709d5f8
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Showing 3 changed files with 90 additions and 19 deletions.
diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -1,13 +1,20 @@
 cmake_minimum_required(VERSION 3.13)
-project(Tink VERSION 2.0.0 LANGUAGES CXX)
+project(tink VERSION 2.0.0 LANGUAGES CXX)
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 
 option(TINK_BUILD_TESTS "Build Tink tests" OFF)
 option(TINK_USE_SYSTEM_OPENSSL "Build Tink linking to OpenSSL installed in the system" OFF)
 option(TINK_USE_INSTALLED_ABSEIL "Build Tink linking to Abseil installed in the system" OFF)
 option(TINK_USE_INSTALLED_GOOGLETEST "Build Tink linking to GTest installed in the system" OFF)
+option(TINK_USE_INSTALLED_PROTOBUF "Build Tink linking to Protobuf installed in the system" OFF)
+option(TINK_USE_INSTALLED_RAPIDJSON "Build Tink linking to Rapidjson installed in the system" OFF)
 option(USE_ONLY_FIPS "Enables the FIPS only mode in Tink" OFF)
+option(TINK_BUILD_SHARED_LIB "Build libtink bundle it with the headers" OFF)
+
+if (TINK_BUILD_SHARED_LIB)
+  set(CMAKE_POSITION_INDEPENDENT_CODE ON CACHE BOOL "libtink override" FORCE)
+endif()
 
 set(CPACK_GENERATOR TGZ)
 set(CPACK_PACKAGE_VERSION ${PROJECT_VERSION})
@@ -34,3 +41,25 @@ list(APPEND TINK_INCLUDE_DIRS "${TINK_INCLUDE_ALIAS_DIR}")
 
 add_subdirectory(tink)
 add_subdirectory(proto)
+
+if (TINK_BUILD_SHARED_LIB)
+  install(
+    DIRECTORY
+      "${CMAKE_CURRENT_SOURCE_DIR}/tink/"
+      "${TINK_GENFILE_DIR}/tink/"
+    DESTINATION "include/tink"
+    FILES_MATCHING PATTERN "*.h"
+  )
+
+  install(
+    DIRECTORY
+      "${TINK_GENFILE_DIR}/proto"
+    DESTINATION "include"
+    FILES_MATCHING PATTERN "*.h"
+  )
+
+  export(EXPORT Tink FILE tinkConfig.cmake)
+  install(FILES "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
+    DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}"
+  )
+endif()
diff --git a/cmake/TinkWorkspace.cmake b/cmake/TinkWorkspace.cmake
@@ -110,7 +110,7 @@ if (NOT TARGET crypto)
       "$<BUILD_INTERFACE:${boringssl_SOURCE_DIR}/src/include>")
   else()
     # Support for ED25519 was added from 1.1.1.
-    find_package(OpenSSL 1.1.1 REQUIRED)
+    find_package(OpenSSL REQUIRED)
     _create_interface_target(crypto OpenSSL::Crypto)
   endif()
 else()
@@ -123,21 +123,28 @@ set(RAPIDJSON_BUILD_DOC OFF CACHE BOOL "Tink dependency override" FORCE)
 set(RAPIDJSON_BUILD_EXAMPLES OFF CACHE BOOL "Tink dependency override" FORCE)
 set(RAPIDJSON_BUILD_TESTS OFF CACHE BOOL "Tink dependency override" FORCE)
 
-http_archive(
-  NAME rapidjson
-  URL https://github.com/Tencent/rapidjson/archive/v1.1.0.tar.gz
-  SHA256 bf7ced29704a1e696fbccf2a2b4ea068e7774fa37f6d7dd4039d0787f8bed98e
-)
+if(NOT TINK_USE_INSTALLED_RAPIDJSON)
+  http_archive(
+    NAME rapidjson
+    URL https://github.com/Tencent/rapidjson/archive/v1.1.0.tar.gz
+    SHA256 bf7ced29704a1e696fbccf2a2b4ea068e7774fa37f6d7dd4039d0787f8bed98e
+  )
+endif()
 # Rapidjson is a header-only library with no explicit target. Here we create one.
 add_library(rapidjson INTERFACE)
 target_include_directories(rapidjson INTERFACE "${rapidjson_SOURCE_DIR}")
 
 set(protobuf_BUILD_TESTS OFF CACHE BOOL "Tink dependency override" FORCE)
 set(protobuf_BUILD_EXAMPLES OFF CACHE BOOL "Tink dependency override" FORCE)
-## Use protobuf X.21.9.
-http_archive(
-  NAME com_google_protobuf
-  URL https://github.com/protocolbuffers/protobuf/archive/v21.9.zip
-  SHA256 5babb8571f1cceafe0c18e13ddb3be556e87e12ceea3463d6b0d0064e6cc1ac3
-  CMAKE_SUBDIR cmake
-)
+
+if(NOT TINK_USE_INSTALLED_PROTOBUF)
+  ## Use protobuf X.21.9.
+  http_archive(
+    NAME com_google_protobuf
+    URL https://github.com/protocolbuffers/protobuf/archive/v21.9.zip
+    SHA256 5babb8571f1cceafe0c18e13ddb3be556e87e12ceea3463d6b0d0064e6cc1ac3
+    CMAKE_SUBDIR cmake
+  )
+else()
+  find_package(Protobuf REQUIRED)
+endif()
diff --git a/tink/CMakeLists.txt b/tink/CMakeLists.txt
@@ -24,9 +24,7 @@ endif()
 
 set(TINK_VERSION_H "${TINK_GENFILE_DIR}/tink/version.h")
 
-tink_cc_library(
-  NAME cc
-  SRCS
+set(TINK_PUBLIC_APIS
     aead.h
     aead_config.h
     aead_factory.h
@@ -73,7 +71,9 @@ tink_cc_library(
     streaming_mac.h
     tink_config.h
     "${TINK_VERSION_H}"
-  DEPS
+)
+
+set(TINK_PUBLIC_API_DEPS
     tink::core::aead
     tink::core::binary_keyset_reader
     tink::core::binary_keyset_writer
@@ -138,7 +138,15 @@ tink_cc_library(
     tink::util::validation
     tink::proto::config_cc_proto
     tink::proto::tink_cc_proto
-  PUBLIC
+)
+
+tink_cc_library(
+  NAME cc
+  SRCS
+    ${TINK_PUBLIC_APIS}
+  DEPS
+    ${TINK_PUBLIC_API_DEPS}
+    PUBLIC
 )
 
 add_library(tink::static ALIAS tink_core_cc)
@@ -1051,6 +1059,33 @@ tink_cc_test(
     tink::util::test_matchers
 )
 
+
+if (TINK_BUILD_SHARED_LIB)
+  add_library(tink SHARED
+    ${TINK_PUBLIC_APIS}
+    version_script.lds
+    exported_symbols.lds
+  )
+  target_link_libraries(tink
+	  PRIVATE
+    -fuse-ld=gold  # GNU ld does not support ICF.
+    -Wl,--version-script="${CMAKE_CURRENT_SOURCE_DIR}/version_script.lds"
+    -Wl,--gc-sections
+    -Wl,--icf=all
+    -Wl,--strip-all
+  )
+  target_include_directories(tink PUBLIC ${TINK_INCLUDE_DIRS})
+  target_link_libraries(tink
+	  PRIVATE
+      -Wl,--whole-archive
+      ${TINK_PUBLIC_API_DEPS}
+      -Wl,--no-whole-archive
+  )
+  set_target_properties(tink PROPERTIES SOVERSION ${TINK_CC_VERSION_LABEL})
+
+  install(TARGETS tink EXPORT Tink LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})
+endif()
+
 tink_cc_library(
   NAME configuration
   SRCS