Add Linux PC and Arm environments

Adds build system config and toolchain options to enable building for
x86 and Arm AArch64 Linux environments.

Change-Id: Id1cf40842fcdc9648a4e06b5ac82e5385f6b2fa4
Signed-off-by: Julian Hall <julian.hall@arm.com>
diff --git a/tools/cmake/compiler/shared_lib_toolchain_file.cmake b/tools/cmake/compiler/shared_lib_toolchain_file.cmake
new file mode 100644
index 0000000..2151ffc
--- /dev/null
+++ b/tools/cmake/compiler/shared_lib_toolchain_file.cmake
@@ -0,0 +1,11 @@
+#-------------------------------------------------------------------------------
+# Copyright (c) 2020, Arm Limited and Contributors. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+#-------------------------------------------------------------------------------
+include($ENV{TS_BASE_TOOLCHAIN_FILE} REQUIRED)
+
+set(CMAKE_POSITION_INDEPENDENT_CODE True)
+set(CMAKE_C_VISIBILITY_PRESET hidden)
+set(CMAKE_CXX_VISIBILITY_PRESET hidden)