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RE: AM_CONDITIONAL and += macros

From: Francis Michel
Subject: RE: AM_CONDITIONAL and += macros
Date: Thu, 14 Feb 2002 13:47:38 -0500

Why does the latest version of autoconf (2.52.5) and automake (1.5b-1) de
not require the same
macro that declares the file where AC_OUTPUT define C preprocessor macros.

The autoconf manual describes AC_CONFIG_HEADER macro and the automake manual
describes that
automake requires AM_CONFIG_HEADER. I remember that previous versions of the
scripts were OK
with that process.

Defining AM_CONFIG_HEADER will result in a problem at the configure process
since the macro
won't be found by autoconf. Defining AC_CONFIG_HEADER result in problems
with automake when 
generating the final makefile.

Can anyone help me out here with a workaround?

Thanks a lot

Francis Michel
-----Original Message-----
From: Jean-Bernard Delva [mailto:address@hidden
Sent: 4 février, 2002 16:12
To: address@hidden
Cc: address@hidden; address@hidden
Subject: AM_CONDITIONAL and += macros

Why is it that using '+=' inside an 'if' with automake causes errors?

Here is an example illustrating the offending behavior:


DUMMY += b

This prompts automake to produce the following error: DUMMY was already defined in condition TRUE, which implies 

   DUMMY (User, where = 1) +=
     TRUE => a

Since 'DUMMY' is previously unconditionally defined, I don't see a way that 
it could cause an error later. Automake should allow the definition.

I know that Automake likes to collect all definitions of a particular macro 
into a single definition. Couldn't Automake make an exception with '+=' in 

Can anyone point to me what I am doing wrong or provide a workaround?

Thank you,

Jean-Bernard Delva

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