From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from lists.gentoo.org (pigeon.gentoo.org [208.92.234.80]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by finch.gentoo.org (Postfix) with ESMTPS id 24E68158042 for ; Sat, 9 Nov 2024 23:28:22 +0000 (UTC) Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 0A2B1E09C3; Sat, 9 Nov 2024 23:28:17 +0000 (UTC) Received: from smtp.gentoo.org (woodpecker.gentoo.org [140.211.166.183]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by pigeon.gentoo.org (Postfix) with ESMTPS id B4F4BE09BF for ; Sat, 9 Nov 2024 23:28:16 +0000 (UTC) Message-ID: <60cfeed31956ac629faaca329ea2b94003ccfe78.camel@gentoo.org> Subject: Re: [gentoo-dev] [RFC] Dealing with default upstream Rust flags (?) From: James Le Cuirot To: gentoo-dev@lists.gentoo.org Date: Sat, 09 Nov 2024 23:28:10 +0000 In-Reply-To: <70781f1308cd370f762732053220083c8f734431.camel@gentoo.org> References: <70781f1308cd370f762732053220083c8f734431.camel@gentoo.org> Autocrypt: addr=chewi@gentoo.org; prefer-encrypt=mutual; keydata=mQINBFPBLZQBEACkc6lcPvLMWaFupeWreFCnJebwLjiQgYlizl/nUzIcXXmj4gostejm/ k8ulAjTSrqFnHtcJs+TkriJfQtFZUyGTmdH2GQeZKcjx6ugwsjGiPksigRHcwrDdIrtempsNjXGaZ 0cZyrO6BHfUZ3irSUT3X4agSFQxsGnTfK1zLZCdMychY1vUlg9WynxSlnW+P7MsHM9ZtFquuPp2BD 45AdPjSFyxlwIaaEqApWNXE96mewv3jX6C5voGLVTk1XD52gm8DVeVKcUFOhbu0tQO2nk/v88XTrN kEWEVRfHa1/zkue/YG1JGu21gfVIC/0wdZCu90AY9lo/4qaAy/HgtKQZdzJcS8341Tc27j4cRTak1 NJH+T1xGANdtkXKmkNdmDKZqmuKSiuqnIMzW8QXbBfuoXCaRH80av+GIvGKP+sKetlj2B5hSlZq0e 8PqbdnkfzSVQfKHr4N0czAdtUezIVOL5d07zt+RVn61jmXKUfM3pgzFQBJ8TKO3QgN3iyaEl0p7eC LshZG06uNITs2xOr1QKct4qcWesXL0/szr3AkCVy/yPaEmvvQrZJd8+cK2ZNlEY4bh09f1v/wKlqY 4ITJczOKoRmvI4TJho1Degapom/vGSJ7z+/89V3pXTWBbB4ZImSh4s9qEMnTu5sAV7k8yzTDGp8vm GEHefmMyw0LwQARAQABtClKYW1lcyBMZSBDdWlyb3QgPGNoZXdpQGF1cmEtb25saW5lLmNvLnVrPo kCVwQTAQgAQQIbAwULCQgHAwUVCgkICwUWAwIBAAIeAQIXgAIZARYhBFKN5r2GkaQ5H9ou1CHGMhK cbX3kBQJmNl3tBQkWXDidAAoJECHGMhKcbX3kPv8P/jILiUprANxFIwhs8qKDvaRRYVti9UXBgdGc fqKZBtLcoDF+DFDV+Kegc8ODCKKGQiFsmaroFpzoGPYf3KHT1py1iJbq0uRYKYhepUjK79/Wk4upj tNzgCx8ZANkLObvP2Vj6sM0rJZbOywBRfTTl2cQFVYrr4zVqwzWiYPT8ibTFpI2X2lo78Beb/AL1C 2MPAu2qiOGNDNOJZzMswQEr7tzUnDkOhJP0oCJ94LWgUeQF5qCjc0Q5zmAM8xeunoORW4eoVz5YA2 gEVzz7hjwzOv4IOF3/DaJ/ET7E6WmNekzsdNrPeI2bmK7btV3l5/4tUPrEv8K4PGmhe8iAwYBCDrI SMUhEsZuu/3gM2MN3rY298mfvwJ921TDhTuZzFSTpYg4FYsC/AKs5aYJIgyFnJRVRx9CuZTocish0 ig9fW6Lqte9X4fgmn2fvSTXm6PN18pyAKkCX0F71w2fXx1UNlJrB33EusOZIKohWIlSuN+Yxmw6aF RcVr6+o1m2uwio89zfoq6jid+QPIx1dByQflkFyG1cYEZ6n65lqDBv9Vz0Zchqu6Wa1M20C0rwOLG csb4GQuUzbqZeweD4FLkT2NxLd40yHBFRcYean+uAETPTEHTDHAttjurss6ciH7DCl7UcYVMjZj9i wGd1Ljo/CjSwAZ2L4qztvaJh6OvT1qOjtCJKYW1lcyBMZSBDdWlyb3QgPGNoZXdpQGdlbnRvby5vc mc+iQJUBBMBCAA+AhsDBQsJCAcDBRUKCQgLBRYDAgEAAh4BAheAFiEEUo3mvYaRpDkf2i7UIcYyEp xtfeQFAmY2XfMFCRZcOJ0ACgkQIcYyEpxtfeRWVw/+Kc5kTg5mHNWntP+xK0+n101NcgqxyWCefCb ftJ3jW/Rvr3YgJaRadmKPmu+Y/QRz/5nzkgsukZFmlkPlLSb+NWx2uPhbdknH/3596XPNru6Qg+dW U+4MgXwDI6Rg1S3Txd2O7cL7BLGBNW4o0NnDJQLIxJNuGSHPv1W6UPF1sppxDPkYGpSaHEExrS+rJ h/s4WVaOwDPd6jOAFpPmdCDi/WhuVJG3BGgAg/u1DlYxLgoFfCZ2SR6WAO8lU+a7sjnRwgwvre2T6 tRSSiP9k3xp1XpsUoxGxtCxTPlRYgQ+oH4Azj+w3kw5zKjO99YcBcUJiSgeW2axjjwDePwdwMKs5v SMDxfhsl+XXk+Lb1gAFlUncAgtpA+2sb0oq8Gzz8lW8C+aAdKunukHSUdE1FcKesootEhDbjcps82 VqYYdign7E2iWZI10qmbURStlIDwWfAYWuecAXlfuuWF3u9Ck6SdrPcq0tZVWd/abKMuN6oK1Ygpk f7nAFEq8zB57zGMpWBcdVoQvpHtn9IpRI1OF0doZrKWt6XW08U6QfuCTUCB5fc0v7+ePxVsGJKTAx mCq1gUKXMEmmAT7k96gl3R29bpGhmYvI7YSwocs829cIQUFf4k2liHy9S6WgA9ruu2WY/bn2wXLM0 BFv3PCCKcvpFNfDsaJdWd8SvuRIgy+QK0L0phbWVzIExlIEN1aXJvdCA8amFtZXMubGVjdWlyb3RA bWV0YXN3aXRjaC5jb20+iQJXBBMBCABBAhsDBQsJCAcCAiICBhUKCQgLAgQWAgMBAh4HAheAFiEEU o3mvYaRpDkf2i7UIcYyEpxtfeQFAmY2XfMFCRZcOJ0ACgkQIcYyEpxtfeTxKhAAh7ZaCZvO5FE/Xd 15fL4F5jokUPSUAQ79HhDzjs2tWtXgn5fqmGvqSan8wXuaeSIEe6Ub4o3buKWJESHMwT4dSizEn+z Ft/szQx6/ZaJUhkaIloHVxl7hqPsqBkkVVkVEcZglLCL/wyidNXTwMfsNIFDnq+H59WdjCUXAT1TS 4c1g7CYxA8chvtk2URkpPJYi5ixzhfzX9QjCaxaWSwKPkUj0+hW9sUMcbFL1kXAyEJwPwC1XkqOip g4HcssNlBcHVvQ6yWnn6d7Qn9BHjTSklu15k+x0pcNX36oDwPCy+IY3l69NnkZKs+R3p/e/fy51FC pHoQrAI85Jxh6pkkI3OzR3VPFwbAyLgNcL2U+isQYslPT2GkEum580k5+hAnwXbnK/rWIlXLIMA7+ LsqucCPuCSPFeynuXug+Tve56ieBXwScpJQzPKxq3llm3tUgtO5ssJx9HFl0tZDNqH1ebaQ46T48f t9t5LmRIQBjelZ+IeczSAjLfEn9TW00vPH7ZEnYMfKqBlBtfIflo9vmaWcLwnyRvsEJJ1euqpiQwr ruQch223Y5BL2V66qFsnsWjycvLRj2jQG0mQmBSLRJURxyBOPxAP2rhqlalkDXAhCmgkaUSStQS4B 1xphrx3gyusxrDUpRnNYUOWWZYUxppUq8wnqXuFFZYztxqXQsxL5S0KUphbWVzIExlIEN1aXJvdCA 8amxlY3Vpcm90QG1pY3Jvc29mdC5jb20+iQJXBBMBCABBAhsDBQsJCAcCAiICBhUKCQgLAgQWAgMB Ah4HAheAFiEEUo3mvYaRpDkf2i7UIcYyEpxtfeQFAmY2XfMFCRZcOJ0ACgkQIcYyEpxtfeRZEg//e EGV5TKC+BiqJgJ9JbdtSXqAD9ugm+htoWFz/6SKhqP+H7a+TrRyWGfIAa3xBzmS4vmgi3c34jeW2a n2U02BwkusaOTzZ4raRn084ZtDKhH3GntKB9aG9Peg8yFMzziZEUqnFUwzKHOwKtMHSNRDKNfMrH1 KipEzL1Rf5K7y/SFdt3gLnwNFTuPpFz2p+vBjqX2QH23EM8xBxXWFU/PmOTn69dEh/3NaRVP3442t UgU2P7gLqFVou1oWHLsg0/lmz1LatA5BqBQMcXIJldcg8XhHw5uaNJ6casUT2udWHqWjYxs8KU4CS 1RKHa8If5PbImy9aapcHgI4ng60sw4rhqgJB1ogTx7+VbF1qZHe41IMoLdI+jvAkCUPDZJh2/C8WX mT/L8+tq6spdSGTN/p/zDLbBiwKMoAxs3xVPbnee0RzPouJ1Hmjcf1lgslqa2r1+wivdFXR/HJ/Lr ozCNwKOF4S5qBy2ptBe7SfWHtd4poly4Eq3J63zwE5YhU4shUstNudybXc/JdIbhVTql/U6wtW6MW RcbKGu+9p+gzb+MLk26JQwbr8noRkpv2f+4oGKcLSc7GdYoOHz4CpFL7hlEFQbLXyT5rI1A0sTJYV 6oAIqDyLoO0Mfk7JxVlYjPLWu/0Dvdt539Pmh6MDcB6Jj052LlQXO5ijqgwrZ4dT6I= Content-Type: multipart/signed; micalg="pgp-sha256"; protocol="application/pgp-signature"; boundary="=-IRCjuC7OsLvSYe/gSRpm" User-Agent: Evolution 3.52.4 Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-dev@lists.gentoo.org Reply-to: gentoo-dev@lists.gentoo.org X-Auto-Response-Suppress: DR, RN, NRN, OOF, AutoReply MIME-Version: 1.0 X-Archives-Salt: 97a09f97-e162-4bf3-8aa5-f74f1c717d2e X-Archives-Hash: a7f933e3f30847adf468955cab013775 --=-IRCjuC7OsLvSYe/gSRpm Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Sat, 2024-11-09 at 17:45 +0100, Micha=C5=82 G=C3=B3rny wrote: > Hi, >=20 > Long story short, a lot of Rust upstreams are ricing in their > Cargo.toml: enabling LTO, adjusting LTO jobs to exactly 1, and even > weirder stuff. With C, we generally have clear policies to override > this and respect user flags. With Rust, things aren't that clear. >=20 > Say, let's look at fractal: >=20 > [profile.release] > debug =3D true > lto =3D "thin" > codegen-units =3D 1 >=20 > Upstream is enabling LTO with 1 job (i.e. single threaded) to squeeze > as much as they can from it. Also, they are enabling debug symbols for > some reason. As a result, the build takes 45 minutes, if it doesn't OOM > first. >=20 > How much of that stuff should we respect? Or should we perhaps override > it all? Should we do some special magic via eclass, or perhaps expect > users to set specific RUSTFLAGS for that? Perhaps set default RUSTFLAGS > in the profiles? This stuff is unbelievably messy. Read the comments in cargo.eclass regardi= ng RUSTFLAGS. As things stand, user RUSTFLAGS are respected, as are some project-specific flags but not all. When I worked on this, I didn't look into these profile-related settings. D= o these actually have anything to do with RUSTFLAGS? I'm not sure. gyakovlev experimented with a "gentoo" (as opposed to "release") profile a while back= , but that effort stalled. --=-IRCjuC7OsLvSYe/gSRpm Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- iQJFBAABCAAvFiEEPxcZ3tkwcedKm2a8EiZBXQDdMTcFAmcv8AoRHGNoZXdpQGdl bnRvby5vcmcACgkQEiZBXQDdMTctvhAAj3u5DbD+4BZNsFP/oCCXkoHCzVTHyzAP S8xgesY1MmsDgHsHa/5xKOAaQ78sRINQwPUCOAAaZsyAGRMG0JrKq8odOQ7V3O7W GjZxEsmQ5bECVhxeQyXZRrgVJb2kv8tlvW5MZEQUrojyP/HJ929FKhsOEeCVet4G b8cUUO+Hd0yVrR9rhor9KM26iVh3X6ZwZYuQpOXHJ/M77jfmrxokNSfiHJTl7U1b xYhGkocJRV2s4RKxRgUpS6Oc7EuBRdQZHyvpWWKR5nTJVe63Nnnl54hrq6AqSzNI IbDeXhAZPoT4Nls5MGlv34Z/6emGWcWVMg6qGRMMQw9skBMspZd/HP7uj84cVPvV EvaJfaDeW80igAOjuUsNZAmQsHMijvMFft8AqvOP7Tgu1Utr7zqPfMQNpIsIwyaT esOASIf6kW3Vqbt7g5f0JGqT8+VMNWHtOW0TxemdQm8Lv6o42g6ZTpU6HdV7f+Cf Tzt2NgwzfGJzHuWgSu2gaVOntxRYyBPCjZPafvaBheArufJRnVyOqpwVr3NWGr8G +pSiu9UPow55Fev1jPaGR23Tdf7W5Syu7/lVqJzVXZlxZ1Hzg2LDkKG9AXSC5YNe E2laGR5/VKv5O3qVjB44dbB8fcJAPVxCdn1JM5PP+gdMZQhQtH2Yd85kJFIOV6YG VUPF0jcwGBY= =aKvj -----END PGP SIGNATURE----- --=-IRCjuC7OsLvSYe/gSRpm--