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Re: autoconf 2.61: AC_DEFINE variable with parenthesis

From: Steven G. Johnson
Subject: Re: autoconf 2.61: AC_DEFINE variable with parenthesis
Date: Mon, 25 Dec 2006 20:55:32 -0500
User-agent: Thunderbird (Macintosh/20061207)

Paul Eggert wrote:
Andrey Simonenko <address@hidden> writes:

AC_DEFINE([DEF(x)], [somevalue])

Ouch!  That's not supported, and I'm surprised you got it to work as
well as it did.

It's not really so surprising. Until you yourself rewrote it ten days ago (on Dec. 15), _AC_FC_WRAPPERS depended upon this capability, which means that it has worked in autoconf for over six years now. (In fact, I believe I'm the one who originally patched autoconf to support macro arguments in AC_DEFINE.)

And _AC_FC_WRAPPERS is a perfect example of why AC_DEFINE should continue to support macros with arguments: your rewritten version requires 24 times as much config.h code as the previous version. Some tasks are simply much easier with macro arguments, and since it produces a #define it is somewhat unnatural *not* to support arguments in AC_DEFINE.

My vote would be to keep this support, document it officially if necessary, and revert AC_FC_WRAPPERS to the previous 2-line config.h code.


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