From nobody Fri Mar 14 20:20:04 2025 X-Original-To: dev-commits-src-main@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4ZDwhy0fZrz5qj0p; Fri, 14 Mar 2025 20:20:18 +0000 (UTC) (envelope-from carpeddiem@gmail.com) Received: from mail-il1-f181.google.com (mail-il1-f181.google.com [209.85.166.181]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "WR4" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4ZDwhx4zNYz3gss; Fri, 14 Mar 2025 20:20:17 +0000 (UTC) (envelope-from carpeddiem@gmail.com) Authentication-Results: mx1.freebsd.org; none Received: by mail-il1-f181.google.com with SMTP id e9e14a558f8ab-3ce868498d3so9948855ab.3; Fri, 14 Mar 2025 13:20:17 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1741983616; x=1742588416; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=OLQwqAhhUi/HM99f1NOruXYWyUrC11n2GCHRTZULE2A=; b=JyibPMbemQACjR8v7PHU3Xtga8vjS1ZiW9WMMRdy/YZC+TW2dprxHBJFkdlGItmoI7 Kl9mUQ/WW6KaCOklljc+D4PF66QlCc8ZV3meFerYBsyX9Zsrk2E7a+YxM03UKjNy9aOt vvNy97YvvLgm8dQRKF7t5GfUQe8mAE9Zl9ABs6OjLg47m8xW80wmCU3fLgWIjnpRSPJR pwG9/Iw3gHr5ojTjPC52zuWFxqw0FU5aXx5VXQfF6Bl2DpKavjD9bxRsKZsXr/9IiMbF XaxcG2toqxewb+pdZs3ZvAJPum52Vga4wP3iLUz+NG2Y/a3rKDJpGlYEAhliQlAKVqPX 2ytQ== X-Forwarded-Encrypted: i=1; AJvYcCUPwgyZyWhMf9S9p4fk+nlQFb1Hg03a1xVvqBWoNVkOrAkdMAe7zALUiQtCWhanSrwDO3BOHBC4KK3Fx3T/2VfNyrkk@freebsd.org, AJvYcCXDvcWEl4qi70OHXk8MKcirmtzcuCubg8rwhGtHxjqn7vC0dEdwIPjAZFLz/lqyrvyVsKe9AkTS7BhsgfPJelUwkUbTriI=@freebsd.org X-Gm-Message-State: AOJu0YwY4F5vYXVjiAT2ldZv4txbdTyBTDAWDXOTlURAFUjRubKAuDW9 kOkPA+/AnbR1uEe8wk9kw5Q7sfzZWQ6icFagoxeKgDkIqrvvYrniPBwhMbfy2bF/AsVnUUVLq6W 1AzJAzdW3l0OGLIATVnpCbxVgUA4bXQ== X-Gm-Gg: ASbGnctROwhlwBGBUvziZ8jCGx+8eH9vxxkKze39zJxSOs+a6X7FRMjjEvy061e3iUa sEsxOAk/bP6LaPwcVm+6X7NL5rLA6KGHZu9IUTrLDScO8XOifxsEaTdGtjSFEfQWZ1K0AXNU17n FTelkAwciOq5XG6LUTnLWjliC44UCM/+fxBJkecKK4xWgTJjSiEuP6Zu/aznSi X-Google-Smtp-Source: AGHT+IGhzfmyepR/SQJdpjURhRWINujdwx/udgOY+Q/yq2auGYEAMEZD+1euo1cHw8x5Dg3ZF0YNC6PjT9yg7crc554= X-Received: by 2002:a05:6e02:1fe4:b0:3d1:863e:5536 with SMTP id e9e14a558f8ab-3d483a6cea6mr46794875ab.18.1741983615662; Fri, 14 Mar 2025 13:20:15 -0700 (PDT) List-Id: Commit messages for the main branch of the src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-main List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: dev-commits-src-main@freebsd.org Sender: owner-dev-commits-src-main@FreeBSD.org MIME-Version: 1.0 References: <202503141729.52EHTYis008114@gitrepo.freebsd.org> In-Reply-To: From: Ed Maste Date: Fri, 14 Mar 2025 16:20:04 -0400 X-Gm-Features: AQ5f1JpE2WPSgKqOsjigXhVg1-rntR11Xr8Jqo1Dx0ybqOH3r6EuvipI26IJCYc Message-ID: Subject: Re: git: 1cae7121c667 - main - Enable LLVM_BINUTILS by default To: Nuno Teixeira Cc: src-committers@freebsd.org, dev-commits-src-all@freebsd.org, dev-commits-src-main@freebsd.org Content-Type: text/plain; charset="UTF-8" X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[]; ASN(0.00)[asn:15169, ipnet:209.85.128.0/17, country:US] X-Rspamd-Queue-Id: 4ZDwhx4zNYz3gss X-Spamd-Bar: ---- On Fri, 14 Mar 2025 at 14:05, Nuno Teixeira wrote: > > Hello Ed, > > I have a newbie question about building world/kernel with LTO. > I did not found too much info googling, but I found https://wiki.freebsd.org/LinkTimeOptimization and it says: > > Build and link a kernel with: > > WITHOUT_CTF=yes > WITHOUT_DTRACE=yes > sys/conf/kern.mk -flto=thin (for all clang invocations) > > Is this the correct way to test LTO atm? That page is pretty much completely out of date, unfortunately. Eventually we want to have user-facing knobs for this (for example, WITH_KERNEL_LTO in src.conf) but for experimentation you need to add -flto or -flto=thin to the compiler and linker invocations. This should be possible by setting CFLAGS and LDFLAGS on the command line or by editing kern.mk.