dev-lang/rust: add 1.79.0

Signed-off-by: Anna (navi) Figueiredo Gomes <navi@vlhl.dev>
Signed-off-by: Sam James <sam@gentoo.org>

2 files changed, 817 insertions, 0 deletions

diff --git a/dev-lang/rust/Manifest b/dev-lang/rust/Manifest
index 914386da90c8..9a6d48b57d73 100644
--- a/dev-lang/rust/Manifest
+++ b/dev-lang/rust/Manifest
@@ -200,6 +200,34 @@ DIST rust-1.77.0-x86_64-unknown-linux-gnu.tar.xz 158351120 BLAKE2B 454e8667ea889
 DIST rust-1.77.0-x86_64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 627ab5e55ae8095b2dfd1559c798376a5e6efe751f3c7e74540c9dc1ad8d889fe6c4c2190914506829e50f2fd7de022584b9d3bc3c2aab4e8bf3126dc4306c31 SHA512 24ee5edfb675f7598366edd9390d7a6044830c31ba7c9bc729e987a5c9bbc8cc7a6beddaef7cc9b1718d0ef4dc5f6568e0ca1504a23d82328536dd478dc391e6
 DIST rust-1.77.0-x86_64-unknown-linux-musl.tar.xz 235071684 BLAKE2B 556a5c8aff20b1314dfc6c767adc9b4ac1a70a5976b49e4550247082eadb76622dfdab253ec853d38807990d7c9f46503060675187a589da91ae2f093d5be4c5 SHA512 073c8b4c92f3d6444ea4fd599281c262fdac7fd4589aee0a0f0ec8bae2e6a315578b2fb3ac768579946cf4bfd77b0e440bceb0d3523598cbda7fdb2ac59c98e1
 DIST rust-1.77.0-x86_64-unknown-linux-musl.tar.xz.asc 801 BLAKE2B e049d7c7d25af1074420117b8a984ff585c85808e17b60285b4ae288216dc2ff3f6b08707157b5e9a7778abc312525e755b70fe38f1b0a23fbaeaa9a52305be4 SHA512 c9b54e5ee181dd217b36e258cc0e72c9acd17ccd4f99430ac4a473e898cb3a3cc16f79609e7233649bd8126119da1e2a99f6b7cbf8864dbae5b02746468ace06
+DIST rust-1.78.0-aarch64-unknown-linux-gnu.tar.xz 223523772 BLAKE2B 734416f447462f2778b74f12ffdda13374c95cc399e8728afbeb61b06c0db2e522e760a257d2ce26ce8190cb9c8292880bf02da52df04c3cf205841b95825767 SHA512 80adc842a56ac95d472dcd94aab199dbcfb3d3a5e7a8cb32b8334b038c58a66b8d4f3848ab62a3e799d7c35e6a32abb1f2738a784da8cfa3272ea299c528d5cd
+DIST rust-1.78.0-aarch64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B b6cf17229559a845cf63a22043b1ecb9d7e142b536d0fdb0b44f36f05fe1238096c48dd61becac58275d60401a4f0ce623fed9593290d1f659d31976bb0c42ab SHA512 d03a380d0481b4ec19cfd8026d262ed19b7f6f4f40287b0e23127460029b30c47336232a488dc8d19d22df98f356cbd62d7d44f4a3e1cabb6f575531be8916f7
+DIST rust-1.78.0-aarch64-unknown-linux-musl.tar.xz 204806408 BLAKE2B 08abcef8a38d2d1e463971613481806e897ad4aa48a6e3306c23cf7b906807c944809ec60647c5a80e80978cf8aa8bb1b8e990d69769f94f44022b0f764cead4 SHA512 4ec03b17e2f016fc5449431c4d81d113c12227e6e11553f9fb4fb61e4ba3ca4216aad776e7e3c1e88ac42b797c07f5daa23cac90c3eaebc6d360602f026f9dac
+DIST rust-1.78.0-aarch64-unknown-linux-musl.tar.xz.asc 801 BLAKE2B 1b51cb7337d71930d4d455d7d018a32de858b6627f0ca3cd636420bfdf0d608f550d41985a93b09575e5ac853361c3362a5c0b85366ff19712a4488b79b706c8 SHA512 a9e28326f91009ca248297ba1b099b718f577c030ae3c75daaeb4798cec4e4de585f1652f18ac170228c32e3784d38e328c3821d6735ea1c083bc4d5b80c426f
+DIST rust-1.78.0-arm-unknown-linux-gnueabi.tar.xz 188301776 BLAKE2B e227ecff233f42b9b8dd7b5807de8fbc972107e7099612986b275ba0391c8fc074344db0764d96d00c34a099380354ddc5e7beaad1d5444fc3300481f7504a2e SHA512 624eef628d9ac6e1eaa376677296cda0cecf4ff7efd4763e40735ec69788fcd34b4a4e05c34046e2b57b916285acdfa04f5b122142ed661032e9c0d713e8fd37
+DIST rust-1.78.0-arm-unknown-linux-gnueabi.tar.xz.asc 801 BLAKE2B 43df87950eb9a8a0d2410c861e08ccb90a28c815d50cffbc310fef063e5b6b8b3246f5dc96ad34343a7107b025e863a87021e6d59e0826386e4864b68e3d693a SHA512 85f8822c493a1499e6404400b4c9ac293266533c49c5b0b4fab470d2acaf93078aff4d0c3cc59b9117ae9dcd4c47291a1197de44b56214146fd06e708479a191
+DIST rust-1.78.0-arm-unknown-linux-gnueabihf.tar.xz 188746984 BLAKE2B 567ba5298d6b5a4734d126e0b9e5df24460f6204b32ecf3892b45a26689bafe7ccf15f4a6a098a6a6ec7c3f15cf80d314e682f2d8c784a60d9847056be1885e1 SHA512 f9b5b48042868e91d73e3466f7529e2bb2b72d2489b2d0ff1fc83ec1b1cb035c88e57d48b0ed7298d5f50db0cf9da2681e9a4862c185a2bd241356632516c93a
+DIST rust-1.78.0-arm-unknown-linux-gnueabihf.tar.xz.asc 801 BLAKE2B 4d4e6f113e18870a654bc175eba1ea8ae0129803503deba03d144be4f434b1b5651288e8e1cfaa51bf603f5bf51a959b584e2932c025c3474575dc282ec14d84 SHA512 6c682f710fc26e94f233ae27dab6be27fc132825c3604789671170c040b689bc1871d9a74436832fd07a0da50654d06f0c2b31dd8dd9787f1563e2085a51c14e
+DIST rust-1.78.0-armv7-unknown-linux-gnueabihf.tar.xz 194117584 BLAKE2B 5a62e628f06ba370b5ca2b11d8c657fe9c0885e4d36b14f49ab0b7759af0317f1c79ae92dbd5685c57de58c4f6c31fbe3f1c8b4e1721c91d67ed45232dbed5a8 SHA512 877c13fc97c5ed0785dd005c34e5d37763cee9b7c0b5c2217246d173d952301b1b6b590c3ca441269ec8d341a0cf5f2eb83db63517385bbecb0cf08167a3948e
+DIST rust-1.78.0-armv7-unknown-linux-gnueabihf.tar.xz.asc 801 BLAKE2B a3ba9914c74373835ea6900f97100f631d0d5133adf6f1f938734be0d58484c72372b933e9c42fa37856efc6ade7650d969b412d66edd854ffff4918e8aecfed SHA512 6df8b791841f7bac8539e2ba9fd8d22d516a5906152861baef8ac3256136ef72f8fdb7cc9f843127311a8eeeb7911d058fb377db52ef4fe9a3cdc21396495ea6
+DIST rust-1.78.0-i686-unknown-linux-gnu.tar.xz 219666344 BLAKE2B 9302eae6c99af5598f9952255ca8bb3f0288a03b385f77b79323e725bbe398e722baf5ed2de7fd74caa452248800948aad33954a82cbdab97d1935785e6d4437 SHA512 15b6ab20665af6ac7df6e9c9078b9565b3f2e0d493c0b58cb06c682d9368917b2dbc509dfd23fac09dfddc9c60c5f89bdd8321dbada77958ca5a6261ec54d203
+DIST rust-1.78.0-i686-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 8c23ee14f8db7c4a776f4b5b986384c9e2c79e6449e019c67b526ec219e92e35be5c46a4a2d8187aee0ab958c7ba5f2e10ae40f4c7cd083cbef59bbfc96b0c13 SHA512 ea13084528d4b8d558309a0d5c392c734140a854d9543beb0c9b3c5bd2fb530ba154c608920ad125683e1e9888228422352c3b1c1fdfa9d70df1bd4728193944
+DIST rust-1.78.0-loongarch64-unknown-linux-gnu.tar.xz 170256096 BLAKE2B 07507d4517a9e421bcaa763cc93956d5c57d458f7b20f97f186f902702675b305e79c89142f5c9774b11e0842a82c8cb63247b71dacf1c362c0588b52dd86d3d SHA512 fc21d32b4ec72a3a5a353cbabb902df2676e3341a1f38ee45654eaf960bc677b0316af0474e5ce9d346d285a6f7f03ebeda7302b49650cd1ff8371c27166fd25
+DIST rust-1.78.0-loongarch64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B f99580babc5356c579b81fc0a4168dc1a57432d898e8e2422f00f9027477d704421cb217b5d56fa15a6fe9c01cbf8d4a727c6b01eedddbbcfe9d78e3cdfd24b5 SHA512 ab1ac741f6d71517a510a48fff1b903f325a35b83e35b7b73f4751c1f22e6944044d7a46f21e018659d7cf4ab5b430f6a4ff79971712af46a0d7705faf60e506
+DIST rust-1.78.0-powerpc-unknown-linux-gnu.tar.xz 183422544 BLAKE2B a37b4b4c3ba381e0456f46ac7d311ff6b11701026d568653f86d08e5170f9f21177e87efe329ea8fe259a6ab7991f096bb716af2bf3000569c9797db61a41c72 SHA512 eacce0850bbd9dd9a8a94177234d867dcf8d94c7c2e9f4260207b25364abffc8523e2b85e868b9dd9d4bd02ea4be06fb0c5fbcf5621ace2c0e93041a96cf7ad3
+DIST rust-1.78.0-powerpc-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B ad0201eb1760590381c0e7ee30f612a44157e10a634eb585f253788702653b3658c636c3f8c971a0c96de8944cb4c6960fd555f35dc1ee45fad18c7410ab4b7d SHA512 de5026257f1bd95146cb8057569d643a79ba440aab21efb4ea7df985a527654234c499f16cf75a29eb29cf9d7771893f0d4cfabc3483435ab73ce781aa573ebd
+DIST rust-1.78.0-powerpc64-unknown-linux-gnu.tar.xz 181366112 BLAKE2B c6edeeddc3934e6b93e65776a01c7f19c5e560716490eac2f52b56ba0ff58b974ee2be8e858265c4242d017106880a368244f5565e6f0438258b0cb0bfaa9a0e SHA512 7e0182680d216757d62627b07041d1e36eaae47ed341a548e29d6fe192f5e99a7f933461da025f4341d4c9b816ed3d8d3224bee12e29a0e7fc8bcd9a93c5069c
+DIST rust-1.78.0-powerpc64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B eb94775f878935e94b7a678d4588dd586de8ddd47120670326b6b9ed891edb009d637a2c99b0548e8d74d07960a02558f8421e0754d487e93b57bc2bfc19f052 SHA512 490b0ff842eafdf23adf754051c0f4abec2bfda438bc2e3f57cfe5232f1358318c31bcf6a9ea89284f26389f2f1212dc3ad467b14da465d655bbc6974981cd58
+DIST rust-1.78.0-powerpc64le-unknown-linux-gnu.tar.xz 192130524 BLAKE2B ca961dcd50d9071f0bf7b8f354aa0e78b4e3d4c9bd0b6c72f7a712bbe906833aa8982eb87d9065644c65e57e395ab09ed85bd24cf43477071e0c5cd8ed8590e7 SHA512 c890386b3a82ea36aca2f8753b0fc81a956ce3157b89ccd573403ec99b257299f84c976dc7972278371cca1b3945b21a50d276e10b4cd42647a9d26e0ebdd947
+DIST rust-1.78.0-powerpc64le-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 2bf8596c462d1231ad884a417c5b676447b8474023b5769343ec5a7788cb42c89b937987226db9bd526b3f4ff0a39648e4ee1136c3733d316e35b8ff7295b6ea SHA512 6bc9965d32420bd86422e4d5fefd82a46a169d5d80d298ccca08fb421858d5bc077f785a52f3404f29f394f2dc471a747fec208931d19358aebadab6d9952e0f
+DIST rust-1.78.0-riscv64gc-unknown-linux-gnu.tar.xz 194762504 BLAKE2B b3a802e4b6efcd6c0c3155258b57483c24731e0564d0077f65706ac46898828c4e4d612996c16b63f9dbd5770ac6ab05cad27a27f1083f431e13aeb68e1e77be SHA512 530e5409755dcef86a9d074a3d387dedb5966689d7f47706e43daa5a9a8c65249f4d2b42916363b14924c11e1a5f5d934e9a1d9b47b1ed7206e85496fee27604
+DIST rust-1.78.0-riscv64gc-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 6b8f4a535ae61cf04523254267c2f816e51e459a670b5c2aaa1a28d44092745d7c64baa399583a18cf84e03df2a910409cf99140e3337654a1a051e84d3865a1 SHA512 b226ead3b0dd067eea71d3b5088925f0cfa381aaab6f809e58dff83d00c17da4d99a9d241d49eb66e5db381cd9c63a21c2f5be3ab85658b0bf00b91e970c271a
+DIST rust-1.78.0-s390x-unknown-linux-gnu.tar.xz 207632244 BLAKE2B dd548d618a050991121afe1d8ec7d9fa5eab19d9fead94440f34627562bda9b5f544cbb03a06cd6e85eec4c8d5279b4237cd14c9754f95795e7a26f0b20036e6 SHA512 f17a472ba144efd41f791854931e1e2eb566f126037a1f234b0b54191941a77d8c340687c4c47e0bd4fbe306079cddb36637e998439845ec82206e4c567979af
+DIST rust-1.78.0-s390x-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 5ea16c70fbdcce4cc17c37e9c3b642fc6deae9e2033821d21d3598652b8ed2dbab58cf09dec4e5b2f913cb9fb25820ccf3511af5eb84441e9bee6ba702005def SHA512 8384b20c9f9b6654fd69e90a91aa8572d22b4abbf83ca3b349b7672a5d8db131053ad1b6f8a48881be0060d3db2eaef52075d3a9b15a3c9ef9bb366d592fbcf0
+DIST rust-1.78.0-x86_64-unknown-linux-gnu.tar.xz 163959816 BLAKE2B 1987a6a0ea169d67214bf403cb1e6ada022eed163be6ac72e6e46d1596eba6f282cf87e0581e9ac1b264dee4c59edececc9085b0d16cacabc79f9375da652a24 SHA512 6bb0481804a1de8ee9fde7d4793d45e80f071534f2c3756867d95e99bfc4766de2618b5fd6b1d5e8f4794e54c7056124538fd301c5ec20351f8dada54ef4c20b
+DIST rust-1.78.0-x86_64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 1b6b8e54c0eebbde2a803d14db3d75363c306c621845cad89c927a51a5df0ccb5d1406c8806a82d5d611d0a12c6d6c5ed0f113fe802e4b6a8e504e64562e168c SHA512 10072d0684b40a71176f36ad85b7161e1392b3f52c035bfd0c6bbf5889599234a7201d85a13f04de0269ef9d8e0c51d15a4e9a9151b3fa27cf9a6e8663203786
+DIST rust-1.78.0-x86_64-unknown-linux-musl.tar.xz 245914600 BLAKE2B 66cc40b70ca70eebee5c173eefb07758a8a7421cbf421329b3b405bdab1651334a5ff1202b450139c89039a4c3fd6ecf8b78ed218c62e81c983e6bb7353a335c SHA512 21190a0034aab2757cdcbc2e456fdacc972634f25f5c75daa089030a82b407037d3c7d3528c8d126d48d2a6840edf97526007bef41689a86ef1eec8f8c569f08
+DIST rust-1.78.0-x86_64-unknown-linux-musl.tar.xz.asc 801 BLAKE2B 2ebc83f961f3bb1681bfd2e3f08b2c394bd8701c68b873eb524a9f9a79f3d3858ae75f76c0e0bc452cbdde9466b1d1b2723d04a8d41f68902355150c86d41042 SHA512 a32e7706ab9483a464e3001aebda8975ced4ef66a64f534d67c0a0e2b508f8db0523cfef4a66bb2b264bad486566c7f684d01ba96055133eccf0e9da4abfa46e
 DIST rustc-1.71.0-src.tar.xz 151962928 BLAKE2B da8d83cd6621947816630ae487efe7d087266c1352949cedbbd441ba7c7f7c7beb13b9470e66e2f3359c37a050d0e44d22481c418532d3ebb339a456ab092648 SHA512 2c93bafdd248563765a285add48ca77c1e4bad4d5431675ae6a5cdee4cfe7a41e6bcc880a489ca1069a307fd9a005f2d5f8e230dfc95b4a69152b4f9ca49ac44
 DIST rustc-1.71.0-src.tar.xz.asc 801 BLAKE2B e5ddc4b18a6caeeb63c5aed5b5d15989d086f408787d2e603e50e7b8548dc078683062627280fd2a0393bec01c314eb1cc59f9b0e3146abf07b8365a0b44c640 SHA512 cb1b208c8b2bfccf02c73c4246fb238edb0dd10e292c1ef781920964e54e40add3089d988769982c0ce06b719014685b1c37daa2d08b513d86ad73808f4ce3ac
 DIST rustc-1.71.1-src.tar.xz 151983068 BLAKE2B 3dfdbc246feb84a79ae94c2de978c5585ee06cf6b683d2245869b62e28f7c79f89cc589f5431537713bf088236a0b824acefc1b68e418e9eb72e1eea98054e3f SHA512 fd0e5a16bdbeb539184513583089e55f681cb772810df357b6b1464853f7022ac02edab3dd155b2262ed0047e2a25dea3808dd078dcdfce9d399384465009db4
@@ -216,3 +244,5 @@ DIST rustc-1.77.1-src.tar.xz 162796048 BLAKE2B 18a9fd095808ba78bf50ec94f7fd4087a
 DIST rustc-1.77.1-src.tar.xz.asc 801 BLAKE2B 175a551abdb970295d37a0797cf262ac43055a3cb75b23845dbb8696d04b7705b7a2908b82fcbce7cd7dec2e05c382d06622013b9d4aa19fab7f651f7e00bb73 SHA512 eb24976ae97d2980d4c547bcf27d815f4b98b8aa45441a7201a849ee37e0ef15671732c9916d33964b8e802a87ede758daaadf84901bd569527c8b6c48efff23
 DIST rustc-1.78.0-src.tar.xz 159181212 BLAKE2B dedae58e413689de258f852c988a9a91d4cf14c9525f2619ca6155006ddc9b2262c8141ff995e4fc6ecceec383470e50d2fa0952d933db9b3957ce5c5b96f62e SHA512 d2fb9881e28849d871fda71b1b51652be3839b3283f0d32163f258c5c707a9fb7b589da8dc03bca2fefee1abdd2b44a5f17e85d8c6df7bea119d1e8d22371941
 DIST rustc-1.78.0-src.tar.xz.asc 801 BLAKE2B a40b0eab4e9263694e79f21d92652402579f4a0587fa48b4043211bc645d4303f9af7629e9c8361938748163e99fa7cd04108156780f23f9c8600361785e834b SHA512 ef16c9eed79f36576517e9dd77b56aa767ae9dc745f5df1839e24b76084ac791b27926f3d608b41695ae6022aa10cbdd3650cad163f35037c60d3bd0427b3cbd
+DIST rustc-1.79.0-src.tar.xz 162359512 BLAKE2B 753c0e9c537644d1a12b4d38024c22952a19513791c3da6f955690c544e58964bacbdb579f94cd05910697fc31f77ed6553e5ad3b111bbdfebeea8d2a4fa19f5 SHA512 99d7f276292e5c270648473ff73e9888413a3325ef3a4d7a45f8ce77a42ac87996905f1d875888ce084b621f642017bc9e31a00da1439108dbe19b85d0eab085
+DIST rustc-1.79.0-src.tar.xz.asc 801 BLAKE2B 860283021f513f5d4c81ea1f8d9567f0a052cc53a1d51d7fd9a804a39b855e24e06ea4c73db53176c1cf846910147de6bbc26da35755f3d0d4b296503e691e64 SHA512 51eec85d71817fe21073502c1d18e44ce694dc11b1c181e82462b529a24a610c8e215e6f2640e8b6d80f028207a360e43354cafa863f49a12c547b4c5f52d7e7
diff --git a/dev-lang/rust/rust-1.79.0.ebuild b/dev-lang/rust/rust-1.79.0.ebuild
new file mode 100644
index 000000000000..2cdde5c12fdc
--- /dev/null
+++ b/dev-lang/rust/rust-1.79.0.ebuild
@@ -0,0 +1,787 @@
+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{10..13} )
+
+inherit bash-completion-r1 check-reqs estack flag-o-matic llvm multiprocessing \
+	multilib multilib-build python-any-r1 rust-toolchain toolchain-funcs verify-sig
+
+if [[ ${PV} = *beta* ]]; then
+	betaver=${PV//*beta}
+	BETA_SNAPSHOT="${betaver:0:4}-${betaver:4:2}-${betaver:6:2}"
+	MY_P="rustc-beta"
+	SLOT="beta/${PV}"
+	SRC="${BETA_SNAPSHOT}/rustc-beta-src.tar.xz -> rustc-${PV}-src.tar.xz"
+else
+	ABI_VER="$(ver_cut 1-2)"
+	SLOT="stable/${ABI_VER}"
+	MY_P="rustc-${PV}"
+	SRC="${MY_P}-src.tar.xz"
+	KEYWORDS="~amd64 ~arm ~arm64 ~loong ~mips ~ppc ~ppc64 ~riscv ~sparc ~x86"
+fi
+
+RUST_STAGE0_VERSION="1.$(($(ver_cut 2) - 1)).0"
+
+DESCRIPTION="Systems programming language from Mozilla"
+HOMEPAGE="https://www.rust-lang.org/"
+
+SRC_URI="
+	https://static.rust-lang.org/dist/${SRC}
+	verify-sig? ( https://static.rust-lang.org/dist/${SRC}.asc )
+	!system-bootstrap? ( $(rust_all_arch_uris rust-${RUST_STAGE0_VERSION}) )
+"
+
+# keep in sync with llvm ebuild of the same version as bundled one.
+ALL_LLVM_TARGETS=( AArch64 AMDGPU ARC ARM AVR BPF CSKY DirectX Hexagon Lanai
+	LoongArch M68k Mips MSP430 NVPTX PowerPC RISCV Sparc SPIRV SystemZ VE
+	WebAssembly X86 XCore Xtensa )
+ALL_LLVM_TARGETS=( "${ALL_LLVM_TARGETS[@]/#/llvm_targets_}" )
+LLVM_TARGET_USEDEPS=${ALL_LLVM_TARGETS[@]/%/(-)?}
+
+LICENSE="|| ( MIT Apache-2.0 ) BSD BSD-1 BSD-2 BSD-4"
+
+IUSE="big-endian clippy cpu_flags_x86_sse2 debug dist doc llvm-libunwind lto miri nightly parallel-compiler profiler rustfmt rust-analyzer rust-src system-bootstrap system-llvm test wasm ${ALL_LLVM_TARGETS[*]}"
+
+# Please keep the LLVM dependency block separate. Since LLVM is slotted,
+# we need to *really* make sure we're not pulling more than one slot
+# simultaneously.
+
+# How to use it:
+# List all the working slots in LLVM_VALID_SLOTS, newest first.
+LLVM_VALID_SLOTS=( 18 )
+LLVM_MAX_SLOT="${LLVM_VALID_SLOTS[0]}"
+
+# splitting usedeps needed to avoid CI/pkgcheck's UncheckableDep limitation
+# (-) usedep needed because we may build with older llvm without that target
+LLVM_DEPEND="|| ( "
+for _s in ${LLVM_VALID_SLOTS[@]}; do
+	LLVM_DEPEND+=" ( "
+	for _x in ${ALL_LLVM_TARGETS[@]}; do
+		LLVM_DEPEND+="
+			${_x}? ( sys-devel/llvm:${_s}[${_x}(-)] )
+			wasm? ( sys-devel/lld:${_s} )"
+	done
+	LLVM_DEPEND+=" )"
+done
+unset _s _x
+LLVM_DEPEND+=" )
+	<sys-devel/llvm-$(( LLVM_MAX_SLOT + 1 )):=
+"
+
+# to bootstrap we need at least exactly previous version, or same.
+# most of the time previous versions fail to bootstrap with newer
+# for example 1.47.x, requires at least 1.46.x, 1.47.x is ok,
+# but it fails to bootstrap with 1.48.x
+# https://github.com/rust-lang/rust/blob/${PV}/src/stage0.json
+RUST_DEP_PREV="$(ver_cut 1).$(($(ver_cut 2) - 1))*"
+RUST_DEP_CURR="$(ver_cut 1).$(ver_cut 2)*"
+BOOTSTRAP_DEPEND="||
+	(
+		=dev-lang/rust-"${RUST_DEP_PREV}"
+		=dev-lang/rust-bin-"${RUST_DEP_PREV}"
+		=dev-lang/rust-"${RUST_DEP_CURR}"
+		=dev-lang/rust-bin-"${RUST_DEP_CURR}"
+	)
+"
+
+BDEPEND="${PYTHON_DEPS}
+	app-eselect/eselect-rust
+	|| (
+		>=sys-devel/gcc-4.7
+		>=sys-devel/clang-3.5
+	)
+	system-bootstrap? ( ${BOOTSTRAP_DEPEND} )
+	!system-llvm? (
+		>=dev-build/cmake-3.13.4
+		app-alternatives/ninja
+	)
+	test? ( dev-debug/gdb )
+	verify-sig? ( sec-keys/openpgp-keys-rust )
+"
+
+DEPEND="
+	>=app-arch/xz-utils-5.2
+	net-misc/curl:=[http2,ssl]
+	sys-libs/zlib:=
+	dev-libs/openssl:0=
+	system-llvm? (
+		${LLVM_DEPEND}
+		llvm-libunwind? ( sys-libs/llvm-libunwind:= )
+	)
+	!system-llvm? (
+		!llvm-libunwind? (
+			elibc_musl? ( sys-libs/libunwind:= )
+		)
+	)
+"
+
+RDEPEND="${DEPEND}
+	app-eselect/eselect-rust
+	sys-apps/lsb-release
+"
+
+REQUIRED_USE="|| ( ${ALL_LLVM_TARGETS[*]} )
+	miri? ( nightly )
+	parallel-compiler? ( nightly )
+	rust-analyzer? ( rust-src )
+	test? ( ${ALL_LLVM_TARGETS[*]} )
+	wasm? ( llvm_targets_WebAssembly )
+	x86? ( cpu_flags_x86_sse2 )
+"
+
+# we don't use cmake.eclass, but can get a warning
+CMAKE_WARN_UNUSED_CLI=no
+
+QA_FLAGS_IGNORED="
+	usr/lib/${PN}/${PV}/bin/.*
+	usr/lib/${PN}/${PV}/libexec/.*
+	usr/lib/${PN}/${PV}/lib/lib.*.so
+	usr/lib/${PN}/${PV}/lib/rustlib/.*/bin/.*
+	usr/lib/${PN}/${PV}/lib/rustlib/.*/lib/lib.*.so
+"
+
+QA_SONAME="
+	usr/lib/${PN}/${PV}/lib/lib.*.so.*
+	usr/lib/${PN}/${PV}/lib/rustlib/.*/lib/lib.*.so
+"
+
+QA_PRESTRIPPED="
+	usr/lib/${PN}/${PV}/lib/rustlib/.*/bin/rust-llvm-dwp
+	usr/lib/${PN}/${PV}/lib/rustlib/.*/lib/self-contained/crtn.o
+"
+
+# An rmeta file is custom binary format that contains the metadata for the crate.
+# rmeta files do not support linking, since they do not contain compiled object files.
+# so we can safely silence the warning for this QA check.
+QA_EXECSTACK="usr/lib/${PN}/${PV}/lib/rustlib/*/lib*.rlib:lib.rmeta"
+
+S="${WORKDIR}/${MY_P}-src"
+
+# causes double bootstrap
+RESTRICT="test"
+
+VERIFY_SIG_OPENPGP_KEY_PATH=/usr/share/openpgp-keys/rust.asc
+
+PATCHES=(
+	"${FILESDIR}"/1.78.0-musl-dynamic-linking.patch
+	"${FILESDIR}"/1.74.1-cross-compile-libz.patch
+	#"${FILESDIR}"/1.72.0-bump-libc-deps-to-0.2.146.patch  # pending refresh
+	"${FILESDIR}"/1.78.0-ignore-broken-and-non-applicable-tests.patch
+	"${FILESDIR}"/1.67.0-doc-wasm.patch
+)
+
+clear_vendor_checksums() {
+	sed -i 's/\("files":{\)[^}]*/\1/' "vendor/${1}/.cargo-checksum.json" || die
+}
+
+toml_usex() {
+	usex "${1}" true false
+}
+
+bootstrap_rust_version_check() {
+	# never call from pkg_pretend. eselect-rust may be not installed yet.
+	[[ ${MERGE_TYPE} == binary ]] && return
+	local rustc_wanted="$(ver_cut 1).$(($(ver_cut 2) - 1))"
+	local rustc_toonew="$(ver_cut 1).$(($(ver_cut 2) + 1))"
+	local rustc_version=( $(eselect --brief --root="${BROOT}" rust show 2>/dev/null) )
+	rustc_version=${rustc_version[0]#rust-bin-}
+	rustc_version=${rustc_version#rust-}
+
+	[[ -z "${rustc_version}" ]] && die "Failed to determine rust version, check 'eselect rust' output"
+
+	if ver_test "${rustc_version}" -lt "${rustc_wanted}" ; then
+		eerror "Rust >=${rustc_wanted} is required"
+		eerror "please run 'eselect rust' and set correct rust version"
+		die "selected rust version is too old"
+	elif ver_test "${rustc_version}" -ge "${rustc_toonew}" ; then
+		eerror "Rust <${rustc_toonew} is required"
+		eerror "please run 'eselect rust' and set correct rust version"
+		die "selected rust version is too new"
+	else
+		einfo "Using rust ${rustc_version} to build"
+	fi
+}
+
+pre_build_checks() {
+	local M=8192
+	# multiply requirements by 1.3 if we are doing x86-multilib
+	if use amd64; then
+		M=$(( $(usex abi_x86_32 13 10) * ${M} / 10 ))
+	fi
+	M=$(( $(usex clippy 128 0) + ${M} ))
+	M=$(( $(usex miri 128 0) + ${M} ))
+	M=$(( $(usex rustfmt 256 0) + ${M} ))
+	# add 2G if we compile llvm and 256M per llvm_target
+	if ! use system-llvm; then
+		M=$(( 2048 + ${M} ))
+		local ltarget
+		for ltarget in ${ALL_LLVM_TARGETS[@]}; do
+			M=$(( $(usex ${ltarget} 256 0) + ${M} ))
+		done
+	fi
+	M=$(( $(usex wasm 256 0) + ${M} ))
+	M=$(( $(usex debug 2 1) * ${M} ))
+	eshopts_push -s extglob
+	if is-flagq '-g?(gdb)?([1-9])'; then
+		M=$(( 15 * ${M} / 10 ))
+	fi
+	eshopts_pop
+	M=$(( $(usex system-bootstrap 0 1024) + ${M} ))
+	M=$(( $(usex doc 256 0) + ${M} ))
+	CHECKREQS_DISK_BUILD=${M}M check-reqs_pkg_${EBUILD_PHASE}
+}
+
+llvm_check_deps() {
+	has_version -r "sys-devel/llvm:${LLVM_SLOT}[${LLVM_TARGET_USEDEPS// /,}]"
+}
+
+# Is LLVM being linked against libc++?
+is_libcxx_linked() {
+	local code='#include <ciso646>
+#if defined(_LIBCPP_VERSION)
+	HAVE_LIBCXX
+#endif
+'
+	local out=$($(tc-getCXX) ${CXXFLAGS} ${CPPFLAGS} -x c++ -E -P - <<<"${code}") || return 1
+	[[ ${out} == *HAVE_LIBCXX* ]]
+}
+
+pkg_pretend() {
+	pre_build_checks
+}
+
+pkg_setup() {
+	pre_build_checks
+	python-any-r1_pkg_setup
+
+	export LIBGIT2_NO_PKG_CONFIG=1 #749381
+	if tc-is-cross-compiler; then
+		export PKG_CONFIG_ALLOW_CROSS=1
+		export PKG_CONFIG_PATH="${ROOT}/usr/$(get_libdir)/pkgconfig"
+		export OPENSSL_INCLUDE_DIR="${ROOT}/usr/include"
+		export OPENSSL_LIB_DIR="${ROOT}/usr/$(get_libdir)"
+
+		use system-bootstrap || die "USE=system-bootstrap is required when cross-compiling"
+		use system-llvm && die "USE=system-llvm not allowed when cross-compiling"
+		local cross_llvm_target="$(llvm_tuple_to_target "${CBUILD}")"
+		use "llvm_targets_${cross_llvm_target}" || \
+			die "Must enable LLVM_TARGETS=${cross_llvm_target} matching CBUILD=${CBUILD} when cross-compiling"
+	fi
+
+	use system-bootstrap && bootstrap_rust_version_check
+
+	if use system-llvm; then
+		llvm_pkg_setup
+
+		local llvm_config="$(get_llvm_prefix "${LLVM_MAX_SLOT}")/bin/llvm-config"
+		export LLVM_LINK_SHARED=1
+		export RUSTFLAGS="${RUSTFLAGS} -Lnative=$("${llvm_config}" --libdir)"
+	fi
+}
+
+esetup_unwind_hack() {
+	# https://bugs.gentoo.org/870280
+	# this is a hack needed to bootstrap with libgcc_s linked tarball on llvm-libunwind system.
+	# it should trigger for internal bootstrap or system-bootstrap with rust-bin.
+	# the whole idea is for stage0 to bootstrap with fake libgcc_s.
+	# final stage will receive -L${T}/lib but not -lgcc_s args, producing clean compiler.
+	local fakelib="${T}/fakelib"
+	mkdir -p "${fakelib}" || die
+	# we need both symlinks, one for cargo runtime, other for linker.
+	ln -s "${ESYSROOT}/usr/lib/libunwind.so" "${fakelib}/libgcc_s.so.1" || die
+	ln -s "${ESYSROOT}/usr/lib/libunwind.so" "${fakelib}/libgcc_s.so" || die
+	export LD_LIBRARY_PATH="${fakelib}"
+	export RUSTFLAGS+=" -L${fakelib}"
+	# this is a literally magic variable that gets through cargo cache, without it some
+	# crates ignore RUSTFLAGS.
+	# this variable can not contain leading space.
+	export MAGIC_EXTRA_RUSTFLAGS+="${MAGIC_EXTRA_RUSTFLAGS:+ }-L${fakelib}"
+}
+
+src_prepare() {
+	# Clear vendor checksums for crates that we patched to bump libc.
+	# NOTE: refresh this on each bump.
+	#for i in addr2line-0.20.0 bstr cranelift-jit crossbeam-channel elasticlunr-rs handlebars icu_locid libffi \
+	#	terminal_size tracing-tree; do
+	#	clear_vendor_checksums "${i}"
+	#done
+
+	if ! use system-bootstrap; then
+		has_version sys-devel/gcc || esetup_unwind_hack
+		local rust_stage0_root="${WORKDIR}"/rust-stage0
+		local rust_stage0="rust-${RUST_STAGE0_VERSION}-$(rust_abi "${CBUILD}")"
+
+		"${WORKDIR}/${rust_stage0}"/install.sh --disable-ldconfig \
+			--without=rust-docs-json-preview,rust-docs --destdir="${rust_stage0_root}" --prefix=/ || die
+	fi
+
+	default
+}
+
+src_configure() {
+	filter-lto # https://bugs.gentoo.org/862109 https://bugs.gentoo.org/866231
+
+	local rust_target="" rust_targets="" arch_cflags
+
+	# Collect rust target names to compile standard libs for all ABIs.
+	for v in $(multilib_get_enabled_abi_pairs); do
+		rust_targets+=",\"$(rust_abi $(get_abi_CHOST ${v##*.}))\""
+	done
+	if use wasm; then
+		rust_targets+=",\"wasm32-unknown-unknown\""
+		if use system-llvm; then
+			# un-hardcode rust-lld linker for this target
+			# https://bugs.gentoo.org/715348
+			sed -i '/linker:/ s/rust-lld/wasm-ld/' compiler/rustc_target/src/spec/base/wasm.rs || die
+		fi
+	fi
+	rust_targets="${rust_targets#,}"
+
+	# cargo and rustdoc are mandatory and should always be included
+	local tools='"cargo","rustdoc"'
+	use clippy && tools+=',"clippy"'
+	use miri && tools+=',"miri"'
+	use profiler && tools+=',"rust-demangler"'
+	use rustfmt && tools+=',"rustfmt"'
+	use rust-analyzer && tools+=',"rust-analyzer","rust-analyzer-proc-macro-srv"'
+	use rust-src && tools+=',"src"'
+
+	local rust_stage0_root
+	if use system-bootstrap; then
+		local printsysroot
+		printsysroot="$(rustc --print sysroot || die "Can't determine rust's sysroot")"
+		rust_stage0_root="${printsysroot}"
+	else
+		rust_stage0_root="${WORKDIR}"/rust-stage0
+	fi
+	# in case of prefix it will be already prefixed, as --print sysroot returns full path
+	[[ -d ${rust_stage0_root} ]] || die "${rust_stage0_root} is not a directory"
+
+	rust_target="$(rust_abi)"
+	rust_build="$(rust_abi "${CBUILD}")"
+	rust_host="$(rust_abi "${CHOST}")"
+
+	local cm_btype="$(usex debug DEBUG RELEASE)"
+	cat <<- _EOF_ > "${S}"/config.toml
+		[llvm]
+		download-ci-llvm = false
+		optimize = $(toml_usex !debug)
+		release-debuginfo = $(toml_usex debug)
+		assertions = $(toml_usex debug)
+		ninja = true
+		targets = "${LLVM_TARGETS// /;}"
+		experimental-targets = ""
+		link-shared = $(toml_usex system-llvm)
+		$(if is_libcxx_linked; then
+			# https://bugs.gentoo.org/732632
+			echo "use-libcxx = true"
+			echo "static-libstdcpp = false"
+		fi)
+		$(case "${rust_target}" in
+			i586-*-linux-*)
+				# https://github.com/rust-lang/rust/issues/93059
+				echo 'cflags = "-fcf-protection=none"'
+				echo 'cxxflags = "-fcf-protection=none"'
+				echo 'ldflags = "-fcf-protection=none"'
+				;;
+			*)
+				;;
+		esac)
+		enable-warnings = false
+		[llvm.build-config]
+		CMAKE_VERBOSE_MAKEFILE = "ON"
+		$(if ! tc-is-cross-compiler; then
+			# When cross-compiling, LLVM is compiled twice, once for host and
+			# once for target.  Unfortunately, this build configuration applies
+			# to both, which means any flags applicable to one target but not
+			# the other will break.  Conditionally disable respecting user
+			# flags when cross-compiling.
+			echo "CMAKE_C_FLAGS_${cm_btype} = \"${CFLAGS}\""
+			echo "CMAKE_CXX_FLAGS_${cm_btype} = \"${CXXFLAGS}\""
+			echo "CMAKE_EXE_LINKER_FLAGS_${cm_btype} = \"${LDFLAGS}\""
+			echo "CMAKE_MODULE_LINKER_FLAGS_${cm_btype} = \"${LDFLAGS}\""
+			echo "CMAKE_SHARED_LINKER_FLAGS_${cm_btype} = \"${LDFLAGS}\""
+			echo "CMAKE_STATIC_LINKER_FLAGS_${cm_btype} = \"${ARFLAGS}\""
+		fi)
+		[build]
+		build-stage = 2
+		test-stage = 2
+		build = "${rust_build}"
+		host = ["${rust_host}"]
+		target = [${rust_targets}]
+		cargo = "${rust_stage0_root}/bin/cargo"
+		rustc = "${rust_stage0_root}/bin/rustc"
+		rustfmt = "${rust_stage0_root}/bin/rustfmt"
+		docs = $(toml_usex doc)
+		compiler-docs = false
+		submodules = false
+		python = "${EPYTHON}"
+		locked-deps = true
+		vendor = true
+		extended = true
+		tools = [${tools}]
+		verbose = 2
+		sanitizers = false
+		profiler = $(toml_usex profiler)
+		cargo-native-static = false
+		[install]
+		prefix = "${EPREFIX}/usr/lib/${PN}/${PV}"
+		sysconfdir = "etc"
+		docdir = "share/doc/rust"
+		bindir = "bin"
+		libdir = "lib"
+		mandir = "share/man"
+		[rust]
+		# https://github.com/rust-lang/rust/issues/54872
+		codegen-units-std = 1
+		optimize = true
+		debug = $(toml_usex debug)
+		debug-assertions = $(toml_usex debug)
+		debug-assertions-std = $(toml_usex debug)
+		debuginfo-level = $(usex debug 2 0)
+		debuginfo-level-rustc = $(usex debug 2 0)
+		debuginfo-level-std = $(usex debug 2 0)
+		debuginfo-level-tools = $(usex debug 2 0)
+		debuginfo-level-tests = 0
+		backtrace = true
+		incremental = false
+		$(if ! tc-is-cross-compiler; then
+			echo "default-linker = \"$(tc-getCC)\""
+		fi)
+		parallel-compiler = $(toml_usex parallel-compiler)
+		channel = "$(usex nightly nightly stable)"
+		description = "gentoo"
+		rpath = false
+		verbose-tests = true
+		optimize-tests = $(toml_usex !debug)
+		codegen-tests = true
+		dist-src = false
+		remap-debuginfo = true
+		lld = $(usex system-llvm false $(toml_usex wasm))
+		# only deny warnings if doc+wasm are NOT requested, documenting stage0 wasm std fails without it
+		# https://github.com/rust-lang/rust/issues/74976
+		# https://github.com/rust-lang/rust/issues/76526
+		deny-warnings = $(usex wasm $(usex doc false true) true)
+		backtrace-on-ice = true
+		jemalloc = false
+		# See https://github.com/rust-lang/rust/issues/121124
+		lto = "$(usex lto thin off)"
+		[dist]
+		src-tarball = false
+		compression-formats = ["xz"]
+		compression-profile = "balanced"
+	_EOF_
+
+	for v in $(multilib_get_enabled_abi_pairs); do
+		rust_target=$(rust_abi $(get_abi_CHOST ${v##*.}))
+		arch_cflags="$(get_abi_CFLAGS ${v##*.})"
+
+		export CFLAGS_${rust_target//-/_}="${arch_cflags}"
+
+		cat <<- _EOF_ >> "${S}"/config.toml
+			[target.${rust_target}]
+			ar = "$(tc-getAR)"
+			cc = "$(tc-getCC)"
+			cxx = "$(tc-getCXX)"
+			linker = "$(tc-getCC)"
+			ranlib = "$(tc-getRANLIB)"
+			llvm-libunwind = "$(usex llvm-libunwind $(usex system-llvm system in-tree) no)"
+		_EOF_
+		if use system-llvm; then
+			cat <<- _EOF_ >> "${S}"/config.toml
+				llvm-config = "$(get_llvm_prefix "${LLVM_MAX_SLOT}")/bin/llvm-config"
+			_EOF_
+		fi
+		# by default librustc_target/spec/linux_musl_base.rs sets base.crt_static_default = true;
+		# but we patch it and set to false here as well
+		if use elibc_musl; then
+			cat <<- _EOF_ >> "${S}"/config.toml
+				crt-static = false
+			_EOF_
+		fi
+	done
+	if use wasm; then
+		wasm_target="wasm32-unknown-unknown"
+		export CFLAGS_${wasm_target//-/_}="$(filter-flags '-mcpu*' '-march*' '-mtune*'; echo "$CFLAGS")"
+		cat <<- _EOF_ >> "${S}"/config.toml
+			[target.wasm32-unknown-unknown]
+			linker = "$(usex system-llvm lld rust-lld)"
+			# wasm target does not have profiler_builtins https://bugs.gentoo.org/848483
+			profiler = false
+		_EOF_
+	fi
+
+	if [[ -n ${I_KNOW_WHAT_I_AM_DOING_CROSS} ]]; then # whitespace intentionally shifted below
+	# experimental cross support
+	# discussion: https://bugs.gentoo.org/679878
+	# TODO: c*flags, clang, system-llvm, cargo.eclass target support
+	# it would be much better if we could split out stdlib
+	# complilation to separate ebuild and abuse CATEGORY to
+	# just install to /usr/lib/rustlib/<target>
+
+	# extra targets defined as a bash array
+	# spec format:  <LLVM target>:<rust-target>:<CTARGET>
+	# best place would be /etc/portage/env/dev-lang/rust
+	# Example:
+	# RUST_CROSS_TARGETS=(
+	#	"AArch64:aarch64-unknown-linux-gnu:aarch64-unknown-linux-gnu"
+	# )
+	# no extra hand holding is done, no target transformations, all
+	# values are passed as-is with just basic checks, so it's up to user to supply correct values
+	# valid rust targets can be obtained with
+	# 	rustc --print target-list
+	# matching cross toolchain has to be installed
+	# matching LLVM_TARGET has to be enabled for both rust and llvm (if using system one)
+	# only gcc toolchains installed with crossdev are checked for now.
+
+	# BUG: we can't pass host flags to cross compiler, so just filter for now
+	# BUG: this should be more fine-grained.
+	filter-flags '-mcpu=*' '-march=*' '-mtune=*'
+
+	local cross_target_spec
+	for cross_target_spec in "${RUST_CROSS_TARGETS[@]}";do
+		# extracts first element form <LLVM target>:<rust-target>:<CTARGET>
+		local cross_llvm_target="${cross_target_spec%%:*}"
+		# extracts toolchain triples, <rust-target>:<CTARGET>
+		local cross_triples="${cross_target_spec#*:}"
+		# extracts first element after before : separator
+		local cross_rust_target="${cross_triples%%:*}"
+		# extracts last element after : separator
+		local cross_toolchain="${cross_triples##*:}"
+		use llvm_targets_${cross_llvm_target} || die "need llvm_targets_${cross_llvm_target} target enabled"
+		command -v ${cross_toolchain}-gcc > /dev/null 2>&1 || die "need ${cross_toolchain} cross toolchain"
+
+		cat <<- _EOF_ >> "${S}"/config.toml
+			[target.${cross_rust_target}]
+			ar = "${cross_toolchain}-ar"
+			cc = "${cross_toolchain}-gcc"
+			cxx = "${cross_toolchain}-g++"
+			linker = "${cross_toolchain}-gcc"
+			ranlib = "${cross_toolchain}-ranlib"
+		_EOF_
+		if use system-llvm; then
+			cat <<- _EOF_ >> "${S}"/config.toml
+				llvm-config = "$(get_llvm_prefix "${LLVM_MAX_SLOT}")/bin/llvm-config"
+			_EOF_
+		fi
+		if [[ "${cross_toolchain}" == *-musl* ]]; then
+			cat <<- _EOF_ >> "${S}"/config.toml
+				musl-root = "$(${cross_toolchain}-gcc -print-sysroot)/usr"
+			_EOF_
+		fi
+
+		# append cross target to "normal" target list
+		# example 'target = ["powerpc64le-unknown-linux-gnu"]'
+		# becomes 'target = ["powerpc64le-unknown-linux-gnu","aarch64-unknown-linux-gnu"]'
+
+		rust_targets="${rust_targets},\"${cross_rust_target}\""
+		sed -i "/^target = \[/ s#\[.*\]#\[${rust_targets}\]#" config.toml || die
+
+		ewarn
+		ewarn "Enabled ${cross_rust_target} rust target"
+		ewarn "Using ${cross_toolchain} cross toolchain"
+		ewarn
+		if ! has_version -b 'sys-devel/binutils[multitarget]' ; then
+			ewarn "'sys-devel/binutils[multitarget]' is not installed"
+			ewarn "'strip' will be unable to strip cross libraries"
+			ewarn "cross targets will be installed with full debug information"
+			ewarn "enable 'multitarget' USE flag for binutils to be able to strip object files"
+			ewarn
+			ewarn "Alternatively llvm-strip can be used, it supports stripping any target"
+			ewarn "define STRIP=\"llvm-strip\" to use it (experimental)"
+			ewarn
+		fi
+	done
+	fi # I_KNOW_WHAT_I_AM_DOING_CROSS
+
+	einfo "Rust configured with the following flags:"
+	echo
+	echo RUSTFLAGS="\"${RUSTFLAGS}\""
+	echo RUSTFLAGS_BOOTSTRAP="\"${RUSTFLAGS_BOOTSTRAP}\""
+	echo RUSTFLAGS_NOT_BOOTSTRAP="\"${RUSTFLAGS_NOT_BOOTSTRAP}\""
+	echo MAGIC_EXTRA_RUSTFLAGS="\"${MAGIC_EXTRA_RUSTFLAGS}\""
+	env | grep "CARGO_TARGET_.*_RUSTFLAGS="
+	env | grep "CFLAGS_.*"
+	echo
+	einfo "config.toml contents:"
+	cat "${S}"/config.toml || die
+	echo
+}
+
+src_compile() {
+	RUST_BACKTRACE=1 "${EPYTHON}" ./x.py build -vvv --config="${S}"/config.toml -j$(makeopts_jobs) || die
+}
+
+src_test() {
+	# https://rustc-dev-guide.rust-lang.org/tests/intro.html
+
+	# those are basic and codegen tests.
+	local tests=(
+		codegen
+		codegen-units
+		compile-fail
+		incremental
+		mir-opt
+		pretty
+		run-make
+	)
+
+	# fails if llvm is not built with ALL targets.
+	# and known to fail with system llvm sometimes.
+	use system-llvm || tests+=( assembly )
+
+	# fragile/expensive/less important tests
+	# or tests that require extra builds
+	# TODO: instead of skipping, just make some nonfatal.
+	if [[ ${ERUST_RUN_EXTRA_TESTS:-no} != no ]]; then
+		tests+=(
+			rustdoc
+			rustdoc-js
+			rustdoc-js-std
+			rustdoc-ui
+			run-make-fulldeps
+			ui
+			ui-fulldeps
+		)
+	fi
+
+	local i failed=()
+	einfo "rust_src_test: enabled tests ${tests[@]/#/src/test/}"
+	for i in "${tests[@]}"; do
+		local t="src/test/${i}"
+		einfo "rust_src_test: running ${t}"
+		if ! RUST_BACKTRACE=1 "${EPYTHON}" ./x.py test -vv --config="${S}"/config.toml \
+				-j$(makeopts_jobs) --no-doc --no-fail-fast "${t}"
+		then
+				failed+=( "${t}" )
+				eerror "rust_src_test: ${t} failed"
+		fi
+	done
+
+	if [[ ${#failed[@]} -ne 0 ]]; then
+		eerror "rust_src_test: failure summary: ${failed[@]}"
+		die "aborting due to test failures"
+	fi
+}
+
+src_install() {
+	DESTDIR="${D}" "${EPYTHON}" ./x.py install -vv --config="${S}"/config.toml -j$(makeopts_jobs) || die
+
+	# bug #689562, #689160
+	rm -v "${ED}/usr/lib/${PN}/${PV}/etc/bash_completion.d/cargo" || die
+	rmdir -v "${ED}/usr/lib/${PN}/${PV}"/etc{/bash_completion.d,} || die
+	newbashcomp src/tools/cargo/src/etc/cargo.bashcomp.sh cargo
+
+	local symlinks=(
+		cargo
+		rustc
+		rustdoc
+		rust-gdb
+		rust-gdbgui
+		rust-lldb
+	)
+
+	use clippy && symlinks+=( clippy-driver cargo-clippy )
+	use miri && symlinks+=( miri cargo-miri )
+	use profiler && symlinks+=( rust-demangler )
+	use rustfmt && symlinks+=( rustfmt cargo-fmt )
+	use rust-analyzer && symlinks+=( rust-analyzer )
+
+	einfo "installing eselect-rust symlinks and paths: ${symlinks[@]}"
+	local i
+	for i in "${symlinks[@]}"; do
+		# we need realpath on /usr/bin/* symlink return version-appended binary path.
+		# so /usr/bin/rustc should point to /usr/lib/rust/<ver>/bin/rustc-<ver>
+		# need to fix eselect-rust to remove this hack.
+		local ver_i="${i}-${PV}"
+		if [[ -f "${ED}/usr/lib/${PN}/${PV}/bin/${i}" ]]; then
+			einfo "Installing ${i} symlink"
+			ln -v "${ED}/usr/lib/${PN}/${PV}/bin/${i}" "${ED}/usr/lib/${PN}/${PV}/bin/${ver_i}" || die
+		else
+			ewarn "${i} symlink requested, but source file not found"
+			ewarn "please report this"
+		fi
+		dosym "../lib/${PN}/${PV}/bin/${ver_i}" "/usr/bin/${ver_i}"
+	done
+
+	# symlinks to switch components to active rust in eselect
+	dosym "${PV}/lib" "/usr/lib/${PN}/lib-${PV}"
+	dosym "${PV}/libexec" "/usr/lib/${PN}/libexec-${PV}"
+	dosym "${PV}/share/man" "/usr/lib/${PN}/man-${PV}"
+	dosym "rust/${PV}/lib/rustlib" "/usr/lib/rustlib-${PV}"
+	dosym "../../lib/${PN}/${PV}/share/doc/rust" "/usr/share/doc/${P}"
+
+	newenvd - "50${P}" <<-_EOF_
+		LDPATH="${EPREFIX}/usr/lib/rust/lib"
+		MANPATH="${EPREFIX}/usr/lib/rust/man"
+	_EOF_
+
+	rm -rf "${ED}/usr/lib/${PN}/${PV}"/*.old || die
+	rm -rf "${ED}/usr/lib/${PN}/${PV}/bin"/*.old || die
+	rm -rf "${ED}/usr/lib/${PN}/${PV}/doc"/*.old || die
+
+	# note: eselect-rust adds EROOT to all paths below
+	cat <<-_EOF_ > "${T}/provider-${P}"
+		/usr/bin/cargo
+		/usr/bin/rustdoc
+		/usr/bin/rust-gdb
+		/usr/bin/rust-gdbgui
+		/usr/bin/rust-lldb
+		/usr/lib/rustlib
+		/usr/lib/rust/lib
+		/usr/lib/rust/libexec
+		/usr/lib/rust/man
+		/usr/share/doc/rust
+	_EOF_
+
+	if use clippy; then
+		echo /usr/bin/clippy-driver >> "${T}/provider-${P}"
+		echo /usr/bin/cargo-clippy >> "${T}/provider-${P}"
+	fi
+	if use miri; then
+		echo /usr/bin/miri >> "${T}/provider-${P}"
+		echo /usr/bin/cargo-miri >> "${T}/provider-${P}"
+	fi
+	if use profiler; then
+		echo /usr/bin/rust-demangler >> "${T}/provider-${P}"
+	fi
+	if use rustfmt; then
+		echo /usr/bin/rustfmt >> "${T}/provider-${P}"
+		echo /usr/bin/cargo-fmt >> "${T}/provider-${P}"
+	fi
+	if use rust-analyzer; then
+		echo /usr/bin/rust-analyzer >> "${T}/provider-${P}"
+	fi
+
+	insinto /etc/env.d/rust
+	doins "${T}/provider-${P}"
+
+	if use dist; then
+		"${EPYTHON}" ./x.py dist -vv --config="${S}"/config.toml -j$(makeopts_jobs) || die
+		insinto "/usr/lib/${PN}/${PV}/dist"
+		doins -r "${S}/build/dist/."
+	fi
+}
+
+pkg_postinst() {
+	eselect rust update
+
+	if has_version dev-debug/gdb || has_version dev-debug/lldb; then
+		elog "Rust installs a helper script for calling GDB and LLDB,"
+		elog "for your convenience it is installed under /usr/bin/rust-{gdb,lldb}-${PV}."
+	fi
+
+	if has_version app-editors/emacs; then
+		elog "install app-emacs/rust-mode to get emacs support for rust."
+	fi
+
+	if has_version app-editors/gvim || has_version app-editors/vim; then
+		elog "install app-vim/rust-vim to get vim support for rust."
+	fi
+}
+
+pkg_postrm() {
+	eselect rust cleanup
+}