RE: rfc: new libgcc build mechanism

[Donn Terry <donnte at microsoft dot com>]

Oops... pressed the wrong reply button (I miss mh!).

The idea of $(BACKQUOTE) would allow it to also be null,
so substitution marks would only be present when needed.
(That wasn't clear... sorry.)  (It would also help with
the plethora of \\\\\\\\\\ sequences in configure.)
That does have nested `` in it (without eval), but it
broke with Jason's addition of the new pipeline step.

Yeah... a script would work, but introduce the maintenance
hassle of maintaining it (or synthesizing it in the Makefile
or configure).  Maintenace in this area is already very hard.

Donn

P.S.  2d reply (on Solaris) coming.

 %% Donn Terry <donnte@microsoft.com> writes:

This only went to me?

  dt> That's close, except that @cc_set_by_configure@ or
  dt> @quoted_cc_set_by_configure@ already contains the `` pair, but
  dt> *only sometimes*.  Sometimes it's simply (in effect) a literal,
  dt> and sometimes it needs substitution.  Given that @...@ are used
  dt> elsewhere in the script, and that it's only sometimes needed,
  dt> using a single enclosing `` pair in the Makefile doesn't work.

Ugh.

  dt> (It also occurs to me that we could do something truly awful such as
  dt> BACKQUOTE=`
  dt>    $(BACKQUOTE)<stuff>$(BACKQUOTE)
  dt> when a substitution was needed.  I haven't tried this... it's too
  dt> close after lunch :-) .  Anyone else care to comment?)

I don't see how this would do anything?  You're just hiding the ` from
make, but make doesn't expand ` anyway.  It would just substitute in the
` and invoke the shell with nested ``.

Anyway, you always have the option of writing a small shell script and
encapsulating the case, etc. statements in there and invoking that,
instead of doing it inline.

And, I believe you _can_ get nested `` but you need to use eval and it's
a huge PITA to get the quoting right.

-- 
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 Paul D. Smith <psmith@baynetworks.com>         Network Management
Development
 "Please remain calm...I may be mad, but I am a professional." --Mad
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