Use CMAKE compiler to detect if linker script is supported.

UPC linker script support requires GNU ld with linker script
dump capability (--verbose option).  Note that GNU Gold linker is not
compatible with this requirement.

Author: Nenad Vukicevic

CMakeLists.txt

@@ -267,12 +267,13 @@ set(UPC_IR_RP_ADDRSPACE ${UPC_IR_RP_ADDRSPACE})
 
 # UPC link script enable/disable
 set(LIBUPC_ENABLE_LINK_SCRIPT TRUE CACHE BOOL "enable UPC's use of a custom linker script; this will define the UPC shared section as a no load section on targets where this feature is supported (requires GNU LD)")
-# Check for GNU linker
-execute_process(COMMAND ${CMAKE_C_COMPILER} -Wl,--version OUTPUT_VARIABLE LIBUPC_LD_VERSION ERROR_QUIET)
+set(LIBUPC_LINK_SCRIPT ${LIBUPC_ENABLE_LINK_SCRIPT})
+# Link sctipt option only works with GNU linker (not Gold, or others)
+string(REPLACE " " ";" CMAKE_C_FLAGS_LIST "${CMAKE_C_FLAGS} -Wl,--version")
+execute_process(COMMAND ${CMAKE_C_COMPILER} ${CMAKE_C_FLAGS_LIST} OUTPUT_VARIABLE LIBUPC_LD_VERSION ERROR_QUIET)
 if (NOT "${LIBUPC_LD_VERSION}" MATCHES "GNU ld")
-  set(LIBUPC_ENABLE_LINK_SCRIPT FALSE)
+  set(LIBUPC_LINK_SCRIPT FALSE)
 endif()
-set(LIBUPC_LINK_SCRIPT ${LIBUPC_ENABLE_LINK_SCRIPT})
 
 # Define an option controlling whether we should build for 32-bit on 64-bit
 # platforms, where supported.