Fix Solaris build of ubsan.

[eugenis]

Summary

Broken in D78325.

[ro]

This exactly what I'd been successfully been testing myself on both amd64-pc-solaris2.11 and sparcv9-sun-solaris2.11. Thanks.

compiler-rt/lib/ubsan/CMakeLists.txt

if (FUCHSIA OR UNIX)
 
       foreach(arch ${UBSAN_SUPPORTED_ARCH})
         add_sanitizer_rt_version_list(clang_rt.ubsan_standalone-dynamic-${arch}
                                       LIBS clang_rt.ubsan_standalone-${arch}
                                            clang_rt.ubsan_standalone_cxx-${arch}
                                       EXTRA ubsan.syms.extra)
         set(VERSION_SCRIPT_FLAG
             -Wl,--version-script,${CMAKE_CURRENT_BINARY_DIR}/clang_rt.ubsan_standalone-dynamic-${arch}.vers)
+        # The Solaris 11.4 linker supports a subset of GNU ld version scripts,
+        # but requires a special option to enable it.
+        if (OS_NAME MATCHES "SunOS")
+            list(APPEND VERSION_SCRIPT_FLAG -Wl,-z,gnu-version-script-compat)
+        endif()
         set_property(SOURCE
           ${CMAKE_CURRENT_BINARY_DIR}/dummy.cpp
           APPEND PROPERTY
           OBJECT_DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/clang_rt.ubsan_standalone-dynamic-${arch}.vers)
 
         add_compiler_rt_runtime(clang_rt.ubsan_standalone
           SHARED
           ARCHS ${arch}