From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from NAM11-CO1-obe.outbound.protection.outlook.com (mail-co1nam11on2094.outbound.protection.outlook.com [40.107.220.94]) by sourceware.org (Postfix) with ESMTPS id 1CD793856261 for ; Thu, 16 Jun 2022 21:06:31 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 1CD793856261 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=F5Ezxp2CpTsG4HzaBRitywPFXQCYTEOm5DJ5lXKpJoA4wXNbzlUSLDfphHbyEhFb/yQz66km5jeLLXP/X75Gwk0QLtzgDDrCV+1lXAK1r8cQAjB6WoCzJwUQd4VuAgn3QbzBMOSK7WvHrvQV8A/gJt1Qu3GypDxaz0vlTLSGzOop3yg7PRL0NnCrSSmvE3U6Vyy5cTYrCzTfjCKkUbJ6b3IhqzlZHY8v/Sbt16UrIQ4uEFll3KWv2iyEPwCe1oPbrHg/+RuFf+HI0o3P8scjyfyAX2qRHHPw/gxf0oe0A7tMeQc+zX1LLGCS7p4eDxaGcjb/5AO8tXZvKLyh5bUP3g== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=HNtwiAhs9w6wIklqsmSn0ll99MyUdcVKLe5PvcB+ePw=; b=JIS28OOf0Q6y+GF+Fx3HNRtg6Z2swfSjmzE/JbDtZSEEO4/zG8n+iBxRKV8CjESGNFG6XYuUa7u+LJQRIkjOto/ZkQeGekjS4n1zc1E5/nnKbdzCMPfZy3ZzX573Eq2TNNPbfoiNHng2IUm302JQHhWPePi7144yJKbgKgLcVIaDn53yGKtyBbSUIJdfUV5wxkaChGSo70Th4MKn3eg1XnUM4FcoacBeMUFn7DQYutkmW10LE4W69fYCWWEK8rNtQxX5IPq7FqZI01oBcd4QBfYF0Rc409uzNFLFavbc6bbETVVfGPA7Vn2KDYWg0Xv6fGIPOfAXXIon5dmPC4Fjrg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=amperecomputing.com; dmarc=pass action=none header.from=amperecomputing.com; dkim=pass header.d=amperecomputing.com; arc=none Received: from BYAPR01MB5464.prod.exchangelabs.com (2603:10b6:a03:129::28) by SN6PR01MB4270.prod.exchangelabs.com (2603:10b6:805:b1::28) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5353.13; Thu, 16 Jun 2022 21:06:27 +0000 Received: from BYAPR01MB5464.prod.exchangelabs.com ([fe80::9481:e220:fdbb:af7b]) by BYAPR01MB5464.prod.exchangelabs.com ([fe80::9481:e220:fdbb:af7b%7]) with mapi id 15.20.5353.014; Thu, 16 Jun 2022 21:06:27 +0000 From: Gary Oblock To: Gary Oblock via Gcc-help Subject: Re: Anybody ever got an ARM Thumb-2 cross compiler to work? Thread-Topic: Anybody ever got an ARM Thumb-2 cross compiler to work? 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.29 X-BeenThere: gcc-help@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-help mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 16 Jun 2022 21:06:33 -0000 Chistophe, That would work for me if it's GCC 12 based and built to support the LTO "p= luggin." Would you know if that's the case? Thanks, Gary ________________________________ From: Christophe Lyon Sent: Thursday, June 16, 2022 12:45 AM To: Gary Oblock Cc: Jonathan Wakely ; Gary Oblock via Gcc-help Subject: Re: Anybody ever got an ARM Thumb-2 cross compiler to work? [EXTERNAL EMAIL NOTICE: This email originated from an external sender. Plea= se be mindful of safe email handling and proprietary information protection= practices.] Hi Gary, Sorry, your request is not entirely clear to me either. IIUC what you want to achieve has been working for decades and is certainly= not obsolete :-) If you don't need to build such a toolchain, you can download pre-built bin= ary toolchains from Arm for instance: https://developer.arm.com/Tools%20and%20Software/GNU%20Toolchain#Technical-= Specifications If you want to build a cross toolchain, it's not straightforward but very w= ell supported. I think there are already plenty of documentation describing= how to do that. The important thing is to get the right target triplet when configuring you= r toolchain, you want something like arm-eabi or arm-linux-gnueabi, as oppo= sed to aarch64*. Once the build has completed, when using the compiler make sure to generate= code for an architecture/cpu that actually supports Thumb-2 (via -march=3D= XX/-mcpu=3DXXX), and use -mthumb, as it's generally not the default. Christophe On Thu, Jun 16, 2022 at 9:11 AM Gary Oblock via Gcc-help > wrote: Jonathan By off the shelf, I mean not creating a new target description file. Someth= ing which I'm not at all experienced in (optimizations are my thing so I'm an amateur at creating a cross-compiler.) I can't seem to figure out what the binutils or the gcc target is for Thumb= -2. If you know, please let me know. I suspect that is an obsolete target that no longer exists for the latest binutils and GCC 12. Thanks, Gary ________________________________ From: Jonathan Wakely > Sent: Wednesday, June 15, 2022 11:31 PM To: Gary Oblock > Cc: Gary Oblock via Gcc-help > Subject: Re: Anybody ever got an ARM Thumb-2 cross compiler to work? [EXTERNAL EMAIL NOTICE: This email originated from an external sender. Plea= se be mindful of safe email handling and proprietary information protection= practices.] On Thu, 16 Jun 2022, 00:18 Gary Oblock via Gcc-help, >> wrote: The subject line says it all... I'm beginning to think off the shelf gcc cross compilers are impossible to create because of binutils. Why? What do you mean by "off the shelf"? At other companies we for the most part created custom assemblers, loaders and libraries from scratch when we built a gcc cross compiler. Why can't you just build a cross binutils too?