From 0d204c1c1dabba2dc87957e9ce6bcd32aab70dae Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Thu, 18 Jun 2015 11:28:36 -0400
Subject: CMakeDetermineCompilerId: Try matching compiler output to detect id

Some compilers can only be distinguished by their compilation output
rather than preprocessor symbols or special flags.  Add infrastructure
to determine the compiler id by matching output.
---
 Modules/CMakeDetermineCompilerId.cmake | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/Modules/CMakeDetermineCompilerId.cmake b/Modules/CMakeDetermineCompilerId.cmake
index 3c715e9..68f2194 100644
--- a/Modules/CMakeDetermineCompilerId.cmake
+++ b/Modules/CMakeDetermineCompilerId.cmake
@@ -38,6 +38,10 @@ function(CMAKE_DETERMINE_COMPILER_ID lang flagvar src)
                 ""
                 ${CMAKE_${lang}_COMPILER_ID_TEST_FLAGS})
     CMAKE_DETERMINE_COMPILER_ID_BUILD("${lang}" "${flags}" "${src}")
+    CMAKE_DETERMINE_COMPILER_ID_MATCH_VENDOR("${lang}" "${COMPILER_${lang}_PRODUCED_OUTPUT}")
+    if(CMAKE_${lang}_COMPILER_ID)
+      break()
+    endif()
     foreach(file ${COMPILER_${lang}_PRODUCED_FILES})
       CMAKE_DETERMINE_COMPILER_ID_CHECK("${lang}" "${CMAKE_${lang}_COMPILER_ID_DIR}/${file}" "${src}")
     endforeach()
@@ -358,6 +362,7 @@ ${CMAKE_${lang}_COMPILER_ID_OUTPUT}
 
     # No output files should be inspected.
     set(COMPILER_${lang}_PRODUCED_FILES)
+    set(COMPILER_${lang}_PRODUCED_OUTPUT)
   else()
     # Compilation succeeded.
     file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
@@ -398,10 +403,24 @@ ${CMAKE_${lang}_COMPILER_ID_OUTPUT}
         "${src}\" did not produce an executable in \""
         "${CMAKE_${lang}_COMPILER_ID_DIR}\".\n\n")
     endif()
+
+    set(COMPILER_${lang}_PRODUCED_OUTPUT "${CMAKE_${lang}_COMPILER_ID_OUTPUT}")
   endif()
 
   # Return the files produced by the compilation.
   set(COMPILER_${lang}_PRODUCED_FILES "${COMPILER_${lang}_PRODUCED_FILES}" PARENT_SCOPE)
+  set(COMPILER_${lang}_PRODUCED_OUTPUT "${COMPILER_${lang}_PRODUCED_OUTPUT}" PARENT_SCOPE)
+endfunction()
+
+#-----------------------------------------------------------------------------
+# Function to extract the compiler id from compiler output.
+function(CMAKE_DETERMINE_COMPILER_ID_MATCH_VENDOR lang output)
+  foreach(vendor ${CMAKE_${lang}_COMPILER_ID_MATCH_VENDORS})
+    if(output MATCHES "${CMAKE_${lang}_COMPILER_ID_MATCH_VENDOR_REGEX_${vendor}}")
+      set(CMAKE_${lang}_COMPILER_ID "${vendor}")
+    endif()
+  endforeach()
+  set(CMAKE_${lang}_COMPILER_ID "${CMAKE_${lang}_COMPILER_ID}" PARENT_SCOPE)
 endfunction()
 
 #-----------------------------------------------------------------------------
-- 
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