From 4134240b42ff8fe91d898c3748f3bb6f22ea866a Mon Sep 17 00:00:00 2001
From: Araq <rumpf_a@web.de>
Date: Thu, 29 Dec 2016 19:20:23 +0100
Subject: [PATCH] finish tool: Check for installations in 'program files' et al

---
 tools/finish.nim | 25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

diff --git a/tools/finish.nim b/tools/finish.nim
index cac001d796..afb3d9fc10 100644
--- a/tools/finish.nim
+++ b/tools/finish.nim
@@ -85,14 +85,33 @@ when defined(windows):
         let arch = execProcess(gccExe, ["-dumpmachine"], nil, {poStdErrToStdOut,
                                                                poUsePath})
         when hostCPU == "i386":
-          result = arch.startsWith("i686-")
+          result = arch.contains("i686-")
         elif hostCPU == "amd64":
-          result = arch.startsWith("x86_64-")
+          result = arch.contains("x86_64-")
         else:
           {.error: "Unknown CPU for Windows.".}
       except OSError, IOError:
         result = false
 
+  proc defaultMingwLocations(): seq[string] =
+    proc probeDir(dir: string; result: var seq[string]) =
+      for k, x in walkDir(dir, relative=true):
+        if k in {pcDir, pcLinkToDir}:
+          if x.contains("mingw") or x.contains("posix"):
+            let dest = dir / x
+            probeDir(dest, result)
+            result.add(dest)
+
+    result = @["dist/mingw", "../mingw", r"C:\mingw"]
+    let pfx86 = getEnv("programfiles(x86)")
+    let pf = getEnv("programfiles")
+    when hostCPU == "i386":
+      probeDir(pfx86, result)
+      probeDir(pf, result)
+    else:
+      probeDir(pf, result)
+      probeDir(pfx86, result)
+
   proc tryDirs(incompat: var seq[string]; dirs: varargs[string]): string =
     let bits = $(sizeof(pointer)*8)
     for d in dirs:
@@ -132,7 +151,7 @@ proc main() =
         addToPathEnv(desiredPath)
     if mingWchoices.len == 0:
       # No mingw in path, so try a few locations:
-      let alternative = tryDirs(incompat, "dist/mingw", "../mingw", r"C:\mingw")
+      let alternative = tryDirs(incompat, defaultMingwLocations())
       if alternative.len == 0:
         if incompat.len > 0:
           echo "The following *incompatible* MingW installations exist"