Runttimes: always build the runtime as PIC

When building the runtime, we do not know how it will be loaded even if
it is static. Default to building in PIC mode for non-Windows targets
(Windows is always implicit PIC).

Author: compnerd

Runtimes/Core/CMakeLists.txt

@@ -35,6 +35,8 @@ set(CMAKE_C_VISIBILITY_PRESET "hidden")
 set(CMAKE_CXX_VISIBILITY_PRESET "hidden")
 set(CMAKE_VISIBILITY_INLINES_HIDDEN YES)
 
+set(CMAKE_POSITION_INDEPENDENT_CODE YES)
+
 set(SwiftCore_CMAKE_MODULES_DIR "${CMAKE_SOURCE_DIR}/cmake/modules")
 list(APPEND CMAKE_MODULE_PATH ${SwiftCore_CMAKE_MODULES_DIR})