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Re: hexadecimal escape sequences

From: Bruno Haible
Subject: Re: hexadecimal escape sequences
Date: Sat, 1 Jan 2011 19:14:50 +0100
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Ben Pfaff wrote:
> Wow.  This is a gigantic bug that I don't see documented
> anywhere.

I can't reproduce it with the "cc" compilers I have access to right now.
But it was apparently seen on HP-UX 11: [1] mentions a warning
  cc: "quotearg.c", line 275: warning 30: Character constant contains undefined 
escape sequence.
and quotearg.c line 275 in findutils-4.1.5.tar.gz contains (after preprocessor
  case '\a': esc = 'a'; goto c_escape;
So that compiler did not understand '\a'. I believe the same holds for '\xNN'.

> "git ls-files | grep '\.c$' | xargs grep '\\x'" shows 
> that \x is used many places in the Gnulib tests directory.  Do we
> need to document this and avoid \x everywhere?

It looks like the problem has not been seen in the last 1-2 years, so
I'd say, let's consider it a problem of the past. If it reappears, we
may be able to recommend a different compiler.



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