Detect SGI MIPSpro compiler version with its id

Decode decimal digits from _SGI_COMPILER_VERSION or _COMPILER_VERSION to
compute version number components.  See documentation at:

  http://predef.sourceforge.net/precomp.html

Modules/CMakeCCompilerId.c.in

@@ -141,6 +141,17 @@
 
 #elif defined(_SGI_COMPILER_VERSION) || defined(_COMPILER_VERSION)
 # define COMPILER_ID "MIPSpro"
+# if defined(_SGI_COMPILER_VERSION)
+  /* _SGI_COMPILER_VERSION = VRP */
+#  define COMPILER_VERSION_MAJOR DEC(_SGI_COMPILER_VERSION/100)
+#  define COMPILER_VERSION_MINOR DEC(_SGI_COMPILER_VERSION/10 % 10)
+#  define COMPILER_VERSION_PATCH DEC(_SGI_COMPILER_VERSION    % 10)
+# else
+  /* _COMPILER_VERSION = VRP */
+#  define COMPILER_VERSION_MAJOR DEC(_COMPILER_VERSION/100)
+#  define COMPILER_VERSION_MINOR DEC(_COMPILER_VERSION/10 % 10)
+#  define COMPILER_VERSION_PATCH DEC(_COMPILER_VERSION    % 10)
+# endif
 
 /* This compiler is either not known or is too old to define an
    identification macro.  Try to identify the platform and guess that

Modules/CMakeCXXCompilerId.cpp.in

@@ -132,6 +132,17 @@
 
 #elif defined(_SGI_COMPILER_VERSION) || defined(_COMPILER_VERSION)
 # define COMPILER_ID "MIPSpro"
+# if defined(_SGI_COMPILER_VERSION)
+  /* _SGI_COMPILER_VERSION = VRP */
+#  define COMPILER_VERSION_MAJOR DEC(_SGI_COMPILER_VERSION/100)
+#  define COMPILER_VERSION_MINOR DEC(_SGI_COMPILER_VERSION/10 % 10)
+#  define COMPILER_VERSION_PATCH DEC(_SGI_COMPILER_VERSION    % 10)
+# else
+  /* _COMPILER_VERSION = VRP */
+#  define COMPILER_VERSION_MAJOR DEC(_COMPILER_VERSION/100)
+#  define COMPILER_VERSION_MINOR DEC(_COMPILER_VERSION/10 % 10)
+#  define COMPILER_VERSION_PATCH DEC(_COMPILER_VERSION    % 10)
+# endif
 
 /* This compiler is either not known or is too old to define an
    identification macro.  Try to identify the platform and guess that