From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <tkacvins@gmail.com>
Received: from mail-ej1-x633.google.com (mail-ej1-x633.google.com [IPv6:2a00:1450:4864:20::633])
	by sourceware.org (Postfix) with ESMTPS id 1700E384B128
	for <gcc-help@gcc.gnu.org>; Thu, 27 Oct 2022 20:22:25 +0000 (GMT)
DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 1700E384B128
Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=gmail.com
Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=gmail.com
Received: by mail-ej1-x633.google.com with SMTP id y14so7907932ejd.9
        for <gcc-help@gcc.gnu.org>; Thu, 27 Oct 2022 13:22:25 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20210112;
        h=to:subject:message-id:date:from:mime-version:from:to:cc:subject
         :date:message-id:reply-to;
        bh=PQE+MVqyNgDUPdONk3wIzIJb5JLvarIEQotAmIw1T/o=;
        b=Je8J6x5pivg4/hVHxiD3YhzFGVN/Ziw6RpRxBfLEwuejBIyrsGLjQMPRzAFDoJld7N
         BMgeT9IqDgKC+H17qsq9ZJIPB3eY7BoVmGfURC3/J7579YqFrxpukcgqHNn/U7tiZF7P
         Gt3wubkP2jGltDxC60q0MdgwB4TlyMq6UX83lsUyQpCvEPchIzc2FQ5zy+WG8WF4wRYp
         aAK7M4FEg7pBeSkTKYc1dxrppIvqzkAEamZJOWYJRgFTY6USFAoTUbvXdbB4epBZuSeE
         nTxCdiukOjoXhRvJleyoEALC+hbp3KYH9gyWvpv4Wl94EfdyBpENG4znoORj5l4QY5TL
         WWoQ==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=1e100.net; s=20210112;
        h=to:subject:message-id:date:from:mime-version:x-gm-message-state
         :from:to:cc:subject:date:message-id:reply-to;
        bh=PQE+MVqyNgDUPdONk3wIzIJb5JLvarIEQotAmIw1T/o=;
        b=h8H8jtYLLe3ovc9xfXmMjDKfGesHHqsCXn0hI+nhBlmhOGe+0XyqKk7wmuok8edFI3
         Jw3RbOg5aK26s+SypwgNl2SDOC5y2ghGvnABVe3Irh8eMuFSdOCkJ9ofdYyspmV8r4Vx
         tUlNfp1syq0NFVgljwRB1uSn0wULLOxfQkl83bF0I0OihIXs0AKKbVofGoGj76SUtmlE
         tZPo0Zqi0BOHz2B8g5eoRa19I4YCEVzw9S+1v0NIDxVZjvacjsOvPA3jHJEcrxMzQauU
         hVqiHNlwUAMCXZOL55sCOOPYsN2frZsOn09LdmPOsg2hU+kRtW/XvAOCevGUjd2ihf0G
         dkCA==
X-Gm-Message-State: ACrzQf0oKjh6wg0MuLaccpiJij1ihwCw8oLHXthtGX0JDa52vrg9LJZ6
	fix0X1s0ZY/1YCmOu6hVNLikPeNfh9CrTNPq/drGphATJyQ=
X-Google-Smtp-Source: AMsMyM7BsljiCpElTmRc6j2eaNVzhoIJhQJSZljk3GwRZqsXuZVbk0NIsDM6ThPHHXA5jUQXWdRGXFdt/o6g0y8eq28=
X-Received: by 2002:a17:907:7250:b0:791:9093:47f7 with SMTP id
 ds16-20020a170907725000b00791909347f7mr44121567ejc.278.1666902143028; Thu, 27
 Oct 2022 13:22:23 -0700 (PDT)
MIME-Version: 1.0
From: Tom Kacvinsky <tkacvins@gmail.com>
Date: Thu, 27 Oct 2022 16:22:11 -0400
Message-ID: <CAG_eJLcR7d1WRi9bwngK8njFEf8TwBnKvSTJmEUCN6ntoPNpxg@mail.gmail.com>
Subject: Difference in -E output
To: gcc-help <gcc-help@gcc.gnu.org>
Content-Type: multipart/alternative; boundary="0000000000001c558105ec09e6fc"
X-Spam-Status: No, score=-0.7 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM,HTML_MESSAGE,KAM_SHORT,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,TXREP autolearn=ham autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org
List-Id: <gcc-help.gcc.gnu.org>

--0000000000001c558105ec09e6fc
Content-Type: text/plain; charset="UTF-8"

I am working on an issue that involves our tool depending on the
preprocessed output from gcc -E.

This simple test program exhibits the problem

#include <stdlib.h>
int main() {
  return EXIT_SUCCESS;
}

With some elision, this preprocesses to:

# 3 "test.c"

int main() {

  return

# 4 "test.c" 3 4

        0

# 4 "test.c"

                    ;

}


Notice how when the macro EXIT_SUCCESS is expanded, we get several lines
around the 0?


This is happening for us with GCC 8.3.  But using something as early as
4.8.5 (yeah, I know,

bad idea), we get this:


int main() {

  return 0;

}


I am pretty sure this is an intentional change.  What I'd like to know is
if there is a way of

reverting back to the former behavior?  I looked at


https://gcc.gnu.org/onlinedocs/gcc/Preprocessor-Options.html#Preprocessor-Options


But didn't see anything that jumped out at me and said "this is how you can
work around it"


I did a modicum of bi-secting to see that this change was introduced
somewhere between gcc
4.9.3 and 5.4.0.  I can go deeper to figure out which version actually
broke it if you would find

it helpful.


If anyone has some ideas on this, I'd appreciate hearing them.


Thanks,


Tom

--0000000000001c558105ec09e6fc--