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Message-ID: <41F086E7.6010007@byu.net>
Date: Thu, 20 Jan 2005 21:36:55 -0700
From: Eric Blake <ebb9 AT byu DOT net>
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To: cygwin AT cygwin DOT com, bug-coreutils AT gnu DOT org
Subject: bug in cygwin <sys/termios.h>?
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When compiling coreutils/src/stty.c, I got a warning from this segment:

/* ISC renamed swtch to susp for termios, but we'll accept either name.  */
#if defined(VSUSP) && !defined(VSWTCH)
# define VSWTCH VSUSP
# define CSWTCH CSUSP
#endif
#if defined(VSWTCH) && !defined(CSWTCH)
# define CSWTCH _POSIX_VDISABLE
#endif

stty.c:106:1: warning: "CSWTCH" redefined
In file included from /usr/include/termios.h:4,
                 from stty.c:40:
/usr/include/sys/termios.h:85:1: warning: this is the location of the
previous definition

Investigation of sys/termios.h shows that cygwin has "#define CSWTCH 0x1a"
(ctrl-z), "#define CSUSP CTRL('z')" (where CTRL is ((ch)&0x1f), "#define
VSUSP 14", "#define VSWTC 15", but no VSWTCH anywhere!  Is VSWTC a typo
for the intended VSWTCH?  And why are VSUSP and VSWTC distinct, when
CSWTCH and CSUSP are the same and coreutils was trying to use VSUSP as an
alias to VSWTCH?

Obviously, coreutils should probably add a check for "#if defined(CSUSP)
&& !defined(CSWTCH)" before defining CSWTCH.  But in this particular case,
the coreutils bug was harmless because the redefinition still ended up
with the same value for CSWTCH, even though it was a different spelling of it.

- --
Life is short - so eat dessert first!

Eric Blake             ebb9 AT byu DOT net
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