From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 13847 invoked by alias); 31 May 2007 19:01:16 -0000 Received: (qmail 13835 invoked by uid 22791); 31 May 2007 19:01:11 -0000 X-Spam-Check-By: sourceware.org Received: from mail.cipher.com (HELO cipher.com) (198.107.56.73) by sourceware.org (qpsmtpd/0.31) with ESMTP; Thu, 31 May 2007 19:01:02 +0000 Received: from [10.0.0.98] ([10.0.0.98]) by cipher.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 31 May 2007 12:01:00 -0700 Message-ID: <465F1B6E.4090007@cipher.com> Date: Thu, 31 May 2007 19:43:00 -0000 From: Jim Seymour User-Agent: Thunderbird 2.0.0.0 (Windows/20070326) MIME-Version: 1.0 To: ecos-discuss@ecos.sourceware.org References: <465DBB45.3070802@cipher.com> <20070530181445.GE32489@lunn.ch> In-Reply-To: <20070530181445.GE32489@lunn.ch> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Mailing-List: contact ecos-discuss-help@ecos.sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: ecos-discuss-owner@ecos.sourceware.org Subject: Re: [ECOS] CDL define_proc: Unable to put "extern" in an include files X-SW-Source: 2007-05/txt/msg00220.txt.bz2 Andrew Lunn wrote: > On Wed, May 30, 2007 at 10:58:29AM -0700, Jim Seymour wrote: >> I have a desire to inject an "extern" statement into an include file >> generated by one of our CDL files - so I added a "define_proc" block. >> >> Worked like a champ - until the build got to the rule to create >> "heapgeninc.tcl" out of heapgen.cpp. >> >> This file is run through the preprocessor and the output is then fed to >> Tcl. My "extern" statement is passed through the preprocessor intact, >> so when it gets to Tcl, I get this error: >> >> invalid command name "extern" >> >> The same problem exists when the target.ld file is built. My "extern" >> statement gets stuffed into that file, so ld fails with a "parse error". >> >> I fixed both problems with a horrible kludge: adding a #define to >> heapgen.cpp and then bracketing my extern with a #ifndef. > > Could you turn this around. I think cpp is used to generate the linker > file, heapgeninc.tcl and it is used when compiling C and C++ > code. However each invocation is for different languages. > > Take a look at the output of: > > gcc -v -E -dD empty.c > gcc -v -E -dD empty.cpp > > and see if there is something defined when compiling real code which > is not defined when using CPP for building the .ld file etc. Then use > #ifdef so that the extern is only present for real code generation > compilation. If I'm understanding you here, it sounds like I want some way for the preprocessor to detect the presence of the -E option. I'm not seeing any way to do this, though. As far as I can see, the -E option behaves exactly like a normal compile - it just stops after the preprocessor. I suppose a slightly less kludgy solution to my problem might be to add something like -DPREPROCESSOR_ONLY to the the "heapgeninc.tcl" and "target.ld" rules. -- Jim Seymour, Cipher Systems, Inc., 503-617-7447, http://www.cipher.com -- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss