Use env variables instead of hardcoded paths for ms-mpi search (#327)

src/tools/mpi.jam

@@ -246,35 +246,60 @@ rule init ( mpicxx ? : options * : mpirun-with-options * )
   if ! $(mpicxx) && [ os.on-windows ]
   {
     # Paths for Microsoft MPI
-    local ms_mpi_path_native = "C:\\Program Files\\Microsoft MPI" ;
-    local ms_mpi_sdk_path_native = "C:\\Program Files (x86)\\Microsoft SDKs\\MPI" ;
+    # Treat them explicitly as native OS path references
+    local ms_mpi_bin_native = [ os.environ MSMPI_BIN ] ;
+    if $(ms_mpi_bin_native)
+    {
+      ms_mpi_bin_native = [ path.make $(ms_mpi_bin_native) ] ;
+      ms_mpi_bin_native = [ path.native $(ms_mpi_bin_native) ] ;
+    }
+
+    local ms_mpi_inc_native = [ os.environ MSMPI_INC ] ;
+    if $(ms_mpi_inc_native)
+    {
+      ms_mpi_inc_native = [ path.make $(ms_mpi_inc_native) ] ;
+      ms_mpi_inc_native = [ path.native $(ms_mpi_inc_native) ] ;
+    }
 
     # Path for Microsoft Compute Cluster Pack
     local cluster_pack_path_native = "C:\\Program Files\\Microsoft Compute Cluster Pack" ;
 
     # Try to auto-configure Microsoft MPI
-    if [ GLOB $(ms_mpi_path_native)\\Bin : mpiexec.exe ] &&
-        [ GLOB $(ms_mpi_sdk_path_native)\\Include : mpi.h ]
+    if $(ms_mpi_bin_native) &&
+        $(ms_mpi_inc_native) &&
+        [ GLOB $(ms_mpi_bin_native) : mpiexec.exe ] &&
+        [ GLOB $(ms_mpi_inc_native) : mpi.h ]
     {
       if $(.debug-configuration)
       {
-        ECHO "Found Microsoft MPI: $(ms_mpi_path_native)" ;
-        ECHO "Found Microsoft MPI SDK: $(ms_mpi_sdk_path_native)" ;
+        ECHO "Found Microsoft MPI and Microsoft MPI SDK" ;
+      }
+
+      local ms_mpi_lib32 = [ os.environ MSMPI_LIB32 ] ;
+      if $(ms_mpi_lib32)
+      {
+        ms_mpi_lib32 = [ path.make $(ms_mpi_lib32) ] ;
+      }
+
+      local ms_mpi_lib64 = [ os.environ MSMPI_LIB64 ] ;
+      if $(ms_mpi_lib64)
+      {
+        ms_mpi_lib64 = [ path.make $(ms_mpi_lib64) ] ;
       }
 
-      local ms_mpi_sdk_path = [ path.make $(ms_mpi_sdk_path_native) ] ;
+      local ms_mpi_inc = [ path.make $(ms_mpi_inc_native) ] ;
 
       # Pick up either the 32-bit or 64-bit library, depending on which address
       # model the user has selected. Default to 32-bit.
-      options = <include>$(ms_mpi_sdk_path)/Include
-                <address-model>64:<library-path>$(ms_mpi_sdk_path)/Lib/x64
-                <library-path>$(ms_mpi_sdk_path)/Lib/x86
+      options = <include>$(ms_mpi_inc)
+                <address-model>64:<library-path>$(ms_mpi_lib64)
+                <library-path>$(ms_mpi_lib32)
                 <find-static-library>msmpi
                 <toolset>msvc:<define>_SECURE_SCL=0
               ;
 
       # Setup the "mpirun" equivalent (mpiexec)
-      .mpirun = "\"$(ms_mpi_path_native)\\Bin\\mpiexec.exe"\" ;
+      .mpirun = "\"$(ms_mpi_bin_native)\\mpiexec.exe"\" ;
       .mpirun_flags = -n ;
     }
     # Try to auto-configure to the Microsoft Compute Cluster Pack
@@ -302,8 +327,7 @@ rule init ( mpicxx ? : options * : mpirun-with-options * )
     }
     else if $(.debug-configuration)
     {
-      ECHO "Did not find Microsoft MPI in $(ms_mpi_path_native)" ;
-      ECHO "      and/or Microsoft MPI SDK in $(ms_mpi_sdk_path_native)." ;
+      ECHO "Did not find Microsoft MPI and/or Microsoft MPI SDK" ;
       ECHO "Did not find Microsoft Compute Cluster Pack in $(cluster_pack_path_native)." ;
     }
   }