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From: A L <al20878 AT gmail DOT com>
Date: Fri, 27 Feb 2015 00:03:12 -0500
Message-ID: <CAKVG1_qOJ2W4f8F_Sz7xh_Ee0uqo3odWr=iSmTzOg+R_Pi5t-A@mail.gmail.com>
Subject: Re: Why does CYGWIN double the backslash in execvp()?
To: cygwin AT cygwin DOT com
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Thank you for your response.  It may sound plausible but:

> you tell Cygwin that you want posix semantics

I can't remember seeing that posix semantics require a C library call
to modify arguments in the way the shell does;  since when cygwin a
shell?

> split arg 2 into two args: "DIR" and "C:\\"

and why does it make a difference, all of a sudden?  (posix rules no
longer apply to more than 2 arguments?)  also, if "\\" is followed by
an additional space, "DIR C:\\ ", then it begins to work as well.

> Cygwin cannot make exceptions for individual applications

right!  because cygwin does already know a lot about cmd.exe and
command.com and treats them very specially in case of a "/c" switch
followed by exactly one argument!  take a look at spawn.cc.

btw, on linux, strace for execl() shows no substitution of a lone
backslash passed in an argument... not posix complying, too?

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