error invoking commands preceded by '\' from bash shell

[csw <csw at well dot com>]

When running bash under cygwin on Vista 64bit, I get different behavior if I
precede a command with a '\'.

For example, this works fine ($ is the bash prompt),

$ 'C:\cygwin\bin/gcc.exe' -help
Usage: gcc [options] file...
Options:...

However, this fails.

$ 'C:\cygwin\bin\gcc.exe' --help
bash: C:\cygwin\bin\gcc.exe: command not found


The particular command does not seem to matter.  I used gcc here because it
was the command I discovered this problem with.  

Does anyone know why it makes a difference if the last character before the
command is a '/' or a '\'?

Thanks,

-csw

Runnning on Vista 64-bit

$ cygcheck -v gcc
Found: C:\cygwin\bin\gcc.exe
Found: C:\cygwin\bin\gcc.exe
 -> C:\cygwin\etc\alternatives\gcc
 -> C:\cygwin\bin\gcc-3.exe
C:\cygwin\bin\gcc-3.exe - os=4.0 img=1.0 sys=4.0
  C:\cygwin\bin\cygwin1.dll - os=4.0 img=1.0 sys=4.0
    "cygwin1.dll" v0.0 ts=2009/12/7 2:48
    C:\Windows\system32\ADVAPI32.DLL - os=6.0 img=6.0 sys=6.0
      "ADVAPI32.dll" v0.0 ts=2009/4/10 22:08
      C:\Windows\system32\ntdll.dll - os=6.0 img=6.0 sys=6.0
        "ntdll.dll" v0.0 ts=2009/4/10 21:13
      C:\Windows\system32\KERNEL32.dll - os=6.0 img=6.0 sys=6.0
        "KERNEL32.dll" v0.0 ts=2009/4/10 21:16
        C:\Windows\system32\ntdll.dll (already done)
      C:\Windows\system32\RPCRT4.dll - os=6.0 img=6.0 sys=6.0
        "RPCRT4.dll" v0.0 ts=2009/4/23 3:16
        C:\Windows\system32\KERNEL32.dll (already done)
        C:\Windows\system32\ntdll.dll (already done)
        C:\Windows\system32\ADVAPI32.dll (recursive)
        C:\Windows\system32\Secur32.dll - os=6.0 img=6.0 sys=6.0
          "Secur32.dll" v0.0 ts=2009/6/15 5:48
          C:\Windows\system32\ntdll.dll (already done)
          C:\Windows\system32\KERNEL32.dll (already done)
          C:\Windows\system32\ADVAPI32.dll (recursive)
    C:\Windows\system32\KERNEL32.dll (already done)
    C:\Windows\system32\ntdll.dll (already done)
  C:\cygwin\bin\cygintl-8.dll - os=4.0 img=1.0 sys=4.0
    "cygintl-8.dll" v0.0 ts=2009/4/2 18:15
    C:\cygwin\bin\cygwin1.dll (already done)
    C:\cygwin\bin\cygiconv-2.dll - os=4.0 img=1.0 sys=4.0
      "cygiconv-2.dll" v0.0 ts=2009/12/23 5:25
      C:\cygwin\bin\cygwin1.dll (already done)
      C:\cygwin\bin\cyggcc_s-1.dll - os=4.0 img=1.0 sys=4.0
        "cyggcc_s-1.dll" v0.0 ts=2009/12/7 16:30
        C:\cygwin\bin\cygwin1.dll (already done)
        C:\Windows\system32\KERNEL32.dll (already done)
      C:\Windows\system32\KERNEL32.dll (already done)
    C:\Windows\system32\KERNEL32.dll (already done)
  C:\Windows\system32\KERNEL32.dll (already done)

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