From: Paul Eggert <eggert@cs.ucla.edu>
To: Bruno Haible <bruno@clisp.org>
Cc: bug-gnulib@gnu.org
Subject: Re: fixes for Clang builtins when compiling Emacs on Fedora
Date: Mon, 17 Aug 2020 18:10:09 -0700 [thread overview]
Message-ID: <a594689a-a43b-339e-ab42-3ff41ad6f3bf@cs.ucla.edu> (raw)
In-Reply-To: <2538007.71trb2julv@omega>
On 8/17/20 4:37 PM, Bruno Haible wrote:
>> + Avoid Clang’s __builtin_assume, as clang 9.0.1 -Wassume can
>> + generate a bogus diagnostic "the argument to '__builtin_assume' has
>> + side effects that will be discarded" even when the argument has no
>> + side effects. */
> Do you have a test case, that we could check on clang 10 and on future
> clang versions?
Here's a short test that elicits the bogus warning for me now.
static int f (int x) { return x; }
int main (void) { __builtin_assume (f (1)); return 0; }
next prev parent reply other threads:[~2020-08-18 1:10 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-17 22:02 fixes for Clang builtins when compiling Emacs on Fedora Paul Eggert
2020-08-17 23:37 ` Bruno Haible
2020-08-18 1:10 ` Paul Eggert [this message]
2020-08-22 10:30 ` Clang __built_assume Bruno Haible
2020-08-22 17:32 ` Paul Eggert
2020-08-22 23:01 ` Clang __builtin_assume Bruno Haible
2020-08-23 13:46 ` clang's __diagnose_if__ and glibc fortify Bruno Haible
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
List information: https://lists.gnu.org/mailman/listinfo/bug-gnulib
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=a594689a-a43b-339e-ab42-3ff41ad6f3bf@cs.ucla.edu \
--to=eggert@cs.ucla.edu \
--cc=bruno@clisp.org \
--cc=bug-gnulib@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: link
Be 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).