From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-3.3 required=5.0 tests=MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED,RCVD_IN_MSPIKE_H3,RCVD_IN_MSPIKE_WL, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 6497 invoked from network); 16 Feb 2022 14:57:53 -0000 Received: from mother.openwall.net (195.42.179.200) by inbox.vuxu.org with ESMTPUTF8; 16 Feb 2022 14:57:53 -0000 Received: (qmail 30134 invoked by uid 550); 16 Feb 2022 14:57:51 -0000 Mailing-List: contact musl-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Reply-To: musl@lists.openwall.com Received: (qmail 30100 invoked from network); 16 Feb 2022 14:57:50 -0000 Date: Wed, 16 Feb 2022 09:57:37 -0500 From: Rich Felker To: SIMONE MIONE <205212@studenti.unimore.it> Cc: noloader@gmail.com, musl@lists.openwall.com Message-ID: <20220216145736.GN7074@brightrain.aerifal.cx> References: <20220216112924.GG1320090@port70.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Subject: Re: [musl] musl how to use hard float with aarch64-none-elf-gcc On Wed, Feb 16, 2022 at 12:59:13PM +0100, SIMONE MIONE wrote: > Thank you all for your reply. > I meant when I add musl's lib*.a into my makefile, the compiler complains > about "undefined reference to __addtf3" (and others). Isn't that > soft-float? Or emulation float? It's the implementation of long double which is IEEE quad in the aarch64 ABI. > My supervisor told me "we already have float implementation so we don't > need those functions". So I was wondering if I need to disable it in some > way. No, you need them because there is no fpu implementation of quad. > Il giorno mer 16 feb 2022 alle ore 12:32 Jeffrey Walton > ha scritto: > > > On Wed, Feb 16, 2022 at 6:29 AM Szabolcs Nagy wrote: > > > > > > * Jeffrey Walton [2022-02-16 05:24:48 -0500]: > > > > On Wed, Feb 16, 2022 at 4:51 AM SIMONE MIONE < > > 205212@studenti.unimore.it> wrote: > > > > > > > > > > I am trying to integrate musl in a baremetal environment. I already > > have float support but I can't manage to disable soft-float by musl. > > > > > > > > > > I configure with: > > > > > ./configure --target=aarch64-none-elf --enable-debug --disable-shared > > > > > And simple compile with: > > > > > make > > > > > > > > > > Does anyone know how to use hardfloat instead of soft float? Is > > there any option or flag? Thank you > > > > > > > > The GCC options for hard-floats are -mfpu=neon -mfloat-abi=hard. In > > > > later versions of GCC, you can also use -mfpu=auto (sometimes). > > > > > > that's for 32bit arm > > > > > > there is no soft float abi for aarch64, so i'm not sure what's going on. > > > > Oh, you're right My bad. I did not notice it was Aarch64. > > > > Jeff > >