public inbox for gcc-prs@sourceware.org help / color / mirror / Atom feed
From: michael@moria.de To: gcc-gnats@gcc.gnu.org Subject: preprocessor/9203: preprocessor Date: Mon, 06 Jan 2003 22:36:00 -0000 [thread overview] Message-ID: <20030106222603.459.qmail@palantir.moria.de> (raw) >Number: 9203 >Category: preprocessor >Synopsis: preprocessor >Confidential: no >Severity: non-critical >Priority: low >Responsible: unassigned >State: open >Class: change-request >Submitter-Id: net >Arrival-Date: Mon Jan 06 14:36:00 PST 2003 >Closed-Date: >Last-Modified: >Originator: Michael Haardt >Release: 3.2 >Organization: >Environment: System: Linux palantir 2.4.20-rc1 #8 Wed Nov 6 23:26:07 CET 2002 i686 unknown Architecture: i686 host: i686-pc-linux-gnu build: i686-pc-linux-gnu target: i686-pc-linux-gnu configured with: ../gcc-3.2/configure --prefix=/usr >Description: The preprocessor allows to compare numbers with identifiers. I am not sure if it's a bug or required by the standard, but even if it is legal, a warning just would have saved me some time. According to the ANSI C grammar (K&R, 2nd edition), the syntax allows the comparison. I can't find a reference concerning semantics. >How-To-Repeat: michael@elrond; cat a.c #if 123<ABC number less than identifier #else number greater than identifier #endif michael@elrond; gcc -E -Wall -ansi -pedantic a.c # 1 "a.c" # 1 "<built-in>" # 1 "<command line>" # 1 "a.c" number greater than identifier >Fix: Even if it is legal, which I doubt but can not tell, -Wall should issue a warning. Otherwise of course an error would be nice. The above happened in a comparison of #define constants, of which one was spelled wrong, so it was not substituted. That can easily happen and I would appreciate gcc telling me so. Michael >Release-Note: >Audit-Trail: >Unformatted:
next reply other threads:[~2003-01-06 22:36 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2003-01-06 22:36 michael [this message] 2003-01-06 23:12 neil
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20030106222603.459.qmail@palantir.moria.de \ --to=michael@moria.de \ --cc=gcc-gnats@gcc.gnu.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).