Makefile fix: when determining whether the suffix `.exe` should be used, test...

Makefile fix: when determining whether the suffix `.exe` should be used, test whether the OS is Windows, not whether the compiler is MSVC.

CHANGES.md

 # Changes
 
+## 2017/09/26
+
+* `Makefile` fix: when determining whether the suffix `.exe` should be used,
+  one should test whether the OS is Windows,
+  not whether the compiler is MSVC.
+  (Suggested by Jonathan Protzenko.)
+
 ## 2017/07/12
 
 * Include the LaTeX sources of the manual in the official `.tar.gz` archive.

Makefile

@@ -57,19 +57,25 @@ MLYLIB          := src/standard.mly
 
 # A few settings differ on Windows versus Unix.
 
-# If the compiler is MSVC, then the name of the executable file ends in .exe,
-# and object file names end in .obj instead of .o.
+# If the compiler is MSVC, then object file names end in .obj instead of .o.
 
 ifneq (,$(shell ocamlc -config | grep -E "ccomp_type: msvc"))
-  MENHIREXE    := menhir.exe
   OBJ          := obj
 # LIBSUFFIX    := lib
 else
-  MENHIREXE    := menhir
   OBJ          := o
 # LIBSUFFIX    := a
 endif
 
+# If we are under Windows (regardless of whether we are using MSVC or mingw)
+# then the name of the executable file ends in .exe.
+
+ifeq ($(OS),Windows_NT)
+  MENHIREXE    := menhir.exe
+else
+  MENHIREXE    := menhir
+endif
+
 # The path $(installation_libdir), which is recorded in src/installation.ml (see
 # below), must sometimes be translated using cygpath.