Add tentative support for XC32.

This hasn't been tested all the way to a device, but it at least
gets as far as invoking the compiler successfully.

Modules/MicrochipPathSearch.cmake

@@ -13,7 +13,7 @@
 
 function(MICROCHIP_PATH_SEARCH outvar target)
     set(options)
-    list(APPEND oneValueArgs "CACHE")
+    list(APPEND oneValueArgs CACHE STORE_VERSION)
     set(multiValueArgs BAD_VERSIONS)
     cmake_parse_arguments(SEARCH
         "${options}" "${oneValueArgs}" "${multiValueArgs}"
@@ -87,8 +87,10 @@ function(MICROCHIP_PATH_SEARCH outvar target)
 
     if(best_good_path)
         set(result "${best_good_path}")
+        set(result_version "${best_good_version}")
     elseif(best_bad_path)
         set(result "${best_bad_path}")
+        set(result_version "${best_good_version}")
 
         message(WARNING
             "Version ${best_bad_version} of ${target} is known"
@@ -97,6 +99,7 @@ function(MICROCHIP_PATH_SEARCH outvar target)
         )
     else()
         set(result "${outvar}-NOTFOUND")
+        set(result_version "${SEARCH_STORE_VERSION}-NOTFOUND")
     endif()
 
     string(APPEND msg
@@ -115,4 +118,8 @@ function(MICROCHIP_PATH_SEARCH outvar target)
         )
     endif()
     set(${outvar} "${result}" PARENT_SCOPE)
+
+    if(SEARCH_STORE_VERSION)
+        set(${SEARCH_STORE_VERSION} "${result_version}" PARENT_SCOPE)
+    endif()
 endfunction()

Modules/Platform/MicrochipMCU-C-XC32.cmake

@@ -0,0 +1,41 @@
+#=============================================================================
+# Copyright 2016 Sam Hanes
+#
+# Distributed under the OSI-approved BSD License (the "License");
+# see accompanying file COPYING.txt for details.
+#
+# This software is distributed WITHOUT ANY WARRANTY; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the License for more information.
+#=============================================================================
+# (To distribute this file outside of CMake-Microchip,
+#  substitute the full License text for the above reference.)
+
+# this module is called by `Platform/MicrochipMCU-C`
+# to provide information specific to the XC32 compiler
+
+include(MicrochipPathSearch)
+MICROCHIP_PATH_SEARCH(MICROCHIP_XC32_PATH xc32
+    CACHE "the path to a Microchip XC32 installation"
+    STORE_VERSION MICROCHIP_C_COMPILER_VERSION
+)
+
+if(NOT MICROCHIP_XC32_PATH)
+    message(FATAL_ERROR
+        "No Microchip XC32 compiler was found. Please provide the path"
+        " to an XC32 installation on the command line, for example:\n"
+        "cmake -DMICROCHIP_XC32_PATH=/opt/microchip/xc32/v1.42 ."
+    )
+endif()
+
+set(CMAKE_FIND_ROOT_PATH ${MICROCHIP_XC32_PATH})
+
+set(CMAKE_C_COMPILER xc32-gcc)
+set(MICROCHIP_C_COMPILER_ID XC32)
+
+add_compile_options(
+    "-mprocessor=${MICROCHIP_MCU_MODEL}"
+)
+string(APPEND CMAKE_C_LINK_FLAGS
+    " -mprocessor=${MICROCHIP_MCU_MODEL}"
+)

Modules/Platform/MicrochipMCU-C.cmake

@@ -16,6 +16,8 @@
 
 if(CMAKE_SYSTEM_PROCESSOR STREQUAL "PIC_16")
     include(Platform/MicrochipMCU-C-XC16)
+elseif(CMAKE_SYSTEM_PROCESSOR STREQUAL "PIC_32")
+    include(Platform/MicrochipMCU-C-XC32)
 else()
     message(FATAL_ERROR
         "No C compiler for '${CMAKE_SYSTEM_PROCESSOR}'"