Simplify IntelVSImplicitPath detection project

Use the ENV{LIB} variable directly instead of parsing the output of the
whole environment from "set".  Store the output in a .cmake script and
include it from CMakeDetermineCompilerABI instead of using file(READ).

Modules/CMakeDetermineCompilerABI.cmake

@@ -98,13 +98,10 @@ FUNCTION(CMAKE_DETERMINE_COMPILER_ABI lang src)
           CMAKE_FLAGS
           "-DCMAKE_Fortran_FLAGS:STRING=${CMAKE_Fortran_FLAGS}"
           OUTPUT_VARIABLE _output)
-        FILE(READ
-          ${CMAKE_BINARY_DIR}/CMakeFiles/IntelVSImplicitPath/implict_link.txt
-          dir)
-        LIST(APPEND implicit_dirs "${dir}")
         FILE(WRITE
           "${CMAKE_BINARY_DIR}/CMakeFiles/IntelVSImplicitPath/output.txt"
           "${_output}")
+        INCLUDE(${CMAKE_BINARY_DIR}/CMakeFiles/IntelVSImplicitPath/output.cmake OPTIONAL)
         SET(_desc "Determine Intel Fortran Compiler Implicit Link Path -- done")
         MESSAGE(STATUS "${_desc}")
       ENDIF()

Modules/IntelVSImplicitPath/CMakeLists.txt

@@ -1,11 +1,7 @@
 cmake_minimum_required (VERSION 2.8)
 project(IntelFortranImplicit Fortran)
-add_custom_command(OUTPUT ${IntelFortranImplicit_BINARY_DIR}/env.txt
-  COMMAND set > ${IntelFortranImplicit_BINARY_DIR}/env.txt)
-add_library(FortranLib hello.f
-  ${IntelFortranImplicit_BINARY_DIR}/env.txt)
-add_custom_target(ExtractLibPath ALL
-  COMMAND ${CMAKE_COMMAND} -P ${IntelFortranImplicit_SOURCE_DIR}/extract.cmake
-  WORKING_DIRECTORY ${IntelFortranImplicit_BINARY_DIR}
-)
-add_dependencies(ExtractLibPath FortranLib)
+add_custom_command(
+  OUTPUT output.cmake
+  COMMAND ${CMAKE_COMMAND} -P ${IntelFortranImplicit_SOURCE_DIR}/detect.cmake
+  )
+add_library(FortranLib hello.f output.cmake)

Modules/IntelVSImplicitPath/detect.cmake

@@ -0,0 +1,9 @@
+# look at each path and try to find ifconsol.lib
+set(LIB "$ENV{LIB}")
+foreach(dir ${LIB})
+  file(TO_CMAKE_PATH "${dir}" dir)
+  if(EXISTS "${dir}/ifconsol.lib")
+    file(WRITE output.cmake "list(APPEND implicit_dirs \"${dir}\")\n")
+    break()
+  endif()
+endforeach()

Modules/IntelVSImplicitPath/extract.cmake

@@ -1,12 +0,0 @@
-file(STRINGS env.txt LIB REGEX "^LIB=.*$")
-string(REPLACE "LIB=" "" LIB "${LIB}" )
-# change LIB from a string to a ; separated list of paths
-set(LIB ${LIB})
-# look at each path and try to find ifconsol.lib
-foreach( dir ${LIB})
-  file(TO_CMAKE_PATH "${dir}" dir)
-  if(EXISTS "${dir}/ifconsol.lib")
-    file(WRITE implict_link.txt ${dir})
-    return()
-  endif()
-endforeach()