Enable build-ids for FoundationICU. (#55)

Author: rjmansfield

CMakeLists.txt

@@ -22,6 +22,9 @@ option(BUILD_SHARED_LIBS "build shared libraries" ON)
 set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
+include(CheckLinkerFlag)
+check_linker_flag(CXX "LINKER:--build-id=sha1" LINKER_SUPPORTS_BUILD_ID)
+
 include(GNUInstallDirs)
 
 list(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake/modules)

icuSources/CMakeLists.txt

@@ -31,6 +31,10 @@ endif()
 set_target_properties(_FoundationICU PROPERTIES
     INSTALL_RPATH "$ORIGIN")
 
+if(LINKER_SUPPORTS_BUILD_ID)
+  target_link_options(_FoundationICU PRIVATE "LINKER:--build-id=sha1")
+endif()
+
 # Copy Headers to known directory for direct client (XCTest) test builds
 file(COPY
         include/