The win32 version of GNU make v3.79 can mangle paths that contain a trailing slash.

[duncan . harvey]

The bug is on line 344 of dir.c

   # ifdef WINDOWS32
         /* Remove any trailing '\'.  Windows32 stat fails even on valid
            directories if they end in '\'. */
         if (p[-1] == '\\')
           p[-1] = '\0';
   # endif

It modifies the argument that is passed into find_directory().  This is bad.

Specifically I've had it smash the PATH environment variable so that
sub-shells have an incomplete PATH.  Depending on circumstances and system
setup this can randomly cause commands to fail (because Windows cannot locate
them).

To reproduce:
   1) Add a trailing slash to any (but the final) path in your PATH
   environment variable;
   2) Run the attached makefile;
   3) If Windows could find the shell (at all!), examine the environment.

Alternatively change the first path in PATH, run any makefile and watch it
fail.

============= Makefile ============
all:
     cmd
===================================

--
Duncan Harvey