From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 109928 invoked by alias); 19 Aug 2015 01:27:50 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org Received: (qmail 109908 invoked by uid 48); 19 Aug 2015 01:27:47 -0000 From: "pinskia at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug preprocessor/67266] Use of "cpp -P ..." collapses multiple blank lines Date: Wed, 19 Aug 2015 01:27:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: preprocessor X-Bugzilla-Version: 5.1.1 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: pinskia at gcc dot gnu.org X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2015-08/txt/msg01294.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67266 --- Comment #1 from Andrew Pinski --- From https://gcc.gnu.org/onlinedocs/gcc-5.2.0/cpp/Preprocessor-Output.html#Preprocessor-Output : The output from the C preprocessor looks much like the input, except that all preprocessing directive lines have been replaced with blank lines and all comments with spaces. Long runs of blank lines are discarded. -P does not change that. You might want to look into using -tranditional-cpp also because if you are using preprocessor for other than C, # might be treated not like what you want it to be treated