diff --git a/llvm/lib/Analysis/TargetLibraryInfo.cpp b/llvm/lib/Analysis/TargetLibraryInfo.cpp
--- a/llvm/lib/Analysis/TargetLibraryInfo.cpp
+++ b/llvm/lib/Analysis/TargetLibraryInfo.cpp
@@ -352,59 +352,63 @@
     // Win32 does not support these functions, but
     // they are generally available on POSIX-compliant systems.
     TLI.setUnavailable(LibFunc_access);
+    TLI.setUnavailable(LibFunc_chmod);
+    TLI.setUnavailable(LibFunc_closedir);
+    TLI.setUnavailable(LibFunc_fdopen);
+    TLI.setUnavailable(LibFunc_fileno);
+    TLI.setUnavailable(LibFunc_fseeko);
+    TLI.setUnavailable(LibFunc_fstat);
+    TLI.setUnavailable(LibFunc_ftello);
+    TLI.setUnavailable(LibFunc_gettimeofday);
+    TLI.setUnavailable(LibFunc_memccpy);
+    TLI.setUnavailable(LibFunc_mkdir);
+    TLI.setUnavailable(LibFunc_open);
+    TLI.setUnavailable(LibFunc_opendir);
+    TLI.setUnavailable(LibFunc_pclose);
+    TLI.setUnavailable(LibFunc_popen);
+    TLI.setUnavailable(LibFunc_read);
+    TLI.setUnavailable(LibFunc_rmdir);
+    TLI.setUnavailable(LibFunc_stat);
+    TLI.setUnavailable(LibFunc_strcasecmp);
+    TLI.setUnavailable(LibFunc_strncasecmp);
+    TLI.setUnavailable(LibFunc_unlink);
+    TLI.setUnavailable(LibFunc_utime);
+    TLI.setUnavailable(LibFunc_write);
+  }
+
+  if (T.isOSWindows() && !T.isWindowsCygwinEnvironment()) {
+    // These functions aren't available in either MSVC or MinGW environments.
     TLI.setUnavailable(LibFunc_bcmp);
     TLI.setUnavailable(LibFunc_bcopy);
     TLI.setUnavailable(LibFunc_bzero);
-    TLI.setUnavailable(LibFunc_chmod);
     TLI.setUnavailable(LibFunc_chown);
-    TLI.setUnavailable(LibFunc_closedir);
     TLI.setUnavailable(LibFunc_ctermid);
-    TLI.setUnavailable(LibFunc_fdopen);
     TLI.setUnavailable(LibFunc_ffs);
-    TLI.setUnavailable(LibFunc_fileno);
     TLI.setUnavailable(LibFunc_flockfile);
-    TLI.setUnavailable(LibFunc_fseeko);
-    TLI.setUnavailable(LibFunc_fstat);
     TLI.setUnavailable(LibFunc_fstatvfs);
-    TLI.setUnavailable(LibFunc_ftello);
     TLI.setUnavailable(LibFunc_ftrylockfile);
     TLI.setUnavailable(LibFunc_funlockfile);
     TLI.setUnavailable(LibFunc_getitimer);
     TLI.setUnavailable(LibFunc_getlogin_r);
     TLI.setUnavailable(LibFunc_getpwnam);
-    TLI.setUnavailable(LibFunc_gettimeofday);
     TLI.setUnavailable(LibFunc_htonl);
     TLI.setUnavailable(LibFunc_htons);
     TLI.setUnavailable(LibFunc_lchown);
     TLI.setUnavailable(LibFunc_lstat);
-    TLI.setUnavailable(LibFunc_memccpy);
-    TLI.setUnavailable(LibFunc_mkdir);
     TLI.setUnavailable(LibFunc_ntohl);
     TLI.setUnavailable(LibFunc_ntohs);
-    TLI.setUnavailable(LibFunc_open);
-    TLI.setUnavailable(LibFunc_opendir);
-    TLI.setUnavailable(LibFunc_pclose);
-    TLI.setUnavailable(LibFunc_popen);
     TLI.setUnavailable(LibFunc_pread);
     TLI.setUnavailable(LibFunc_pwrite);
-    TLI.setUnavailable(LibFunc_read);
     TLI.setUnavailable(LibFunc_readlink);
     TLI.setUnavailable(LibFunc_realpath);
-    TLI.setUnavailable(LibFunc_rmdir);
     TLI.setUnavailable(LibFunc_setitimer);
-    TLI.setUnavailable(LibFunc_stat);
     TLI.setUnavailable(LibFunc_statvfs);
     TLI.setUnavailable(LibFunc_stpcpy);
     TLI.setUnavailable(LibFunc_stpncpy);
-    TLI.setUnavailable(LibFunc_strcasecmp);
-    TLI.setUnavailable(LibFunc_strncasecmp);
     TLI.setUnavailable(LibFunc_times);
     TLI.setUnavailable(LibFunc_uname);
-    TLI.setUnavailable(LibFunc_unlink);
     TLI.setUnavailable(LibFunc_unsetenv);
-    TLI.setUnavailable(LibFunc_utime);
     TLI.setUnavailable(LibFunc_utimes);
-    TLI.setUnavailable(LibFunc_write);
   }
 
   switch (T.getOS()) {
diff --git a/llvm/test/Transforms/InstCombine/sprintf-1.ll b/llvm/test/Transforms/InstCombine/sprintf-1.ll
--- a/llvm/test/Transforms/InstCombine/sprintf-1.ll
+++ b/llvm/test/Transforms/InstCombine/sprintf-1.ll
@@ -4,6 +4,7 @@
 ; RUN: opt < %s -instcombine -S | FileCheck %s
 ; RUN: opt < %s -mtriple xcore-xmos-elf -instcombine -S | FileCheck %s -check-prefixes=CHECK,CHECK-IPRINTF
 ; RUN: opt < %s -mtriple=i386-pc-windows-msvc -instcombine -S | FileCheck %s --check-prefixes=CHECK,WIN
+; RUN: opt < %s -mtriple=i386-mingw32 -instcombine -S | FileCheck %s --check-prefixes=CHECK,WIN
 
 target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"