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Re: ylwrap should be included for any Yacc compilations.


From: Derek Price
Subject: Re: ylwrap should be included for any Yacc compilations.
Date: Mon, 04 Apr 2005 17:17:32 -0400
User-agent: Mozilla Thunderbird 1.0 (Windows/20041206)

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Alexandre Duret-Lutz wrote:

|>>> "Derek" == Derek Price <address@hidden> writes:
|
|
| Derek> ylwrap appears to take care of the problem that Yacc
| compilers like to Derek> generate #line directives in generated C
| sources with complete paths Derek> to source files.
|
| So does the inline rule.  Can you provide instructions to reproduce
| the problem ?


Alexandre,

Glancing at the inline rule which was being used:

~    sed '/^#/ s|y\.tab\.c|$@|' y.tab.c >address@hidden && mv address@hidden $@

Only the filename portion of the path is being replaced here.  The
ylwrap script actually replaces an absolute path in the #line
directive with just the filename:

...

~   # Quote $INPUT_DIR so we can use it in a regexp.
~   # FIXME: really we should care about more than `.' and `\'.
~   input_rx=`echo "$input_dir" | sed 's,\\\\,\\\\\\\\,g;s,\\.,\\\\.,g'`

...

~   sed "/^#/{s,$input_rx,,;s,$from,$2,;s,$FROM,$TO,;}" "$from" >"$target"

...

It's the absolute path which some yacc compilers leave behind that we
need removed to avoid this problem.  I'd be just as happy if it
happened in the inline version, but I thought it would be simpler to
just use ylwrap since it already exists and does what is needed.  Even
if it does a little extra work at least the compatibility cruft would
only need to be maintained in a single location.

Cheers,

Derek
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