dev-lang/rust: add 1.59.0

Signed-off-by: Georgy Yakovlev <gyakovlev@gentoo.org>

2 files changed, 739 insertions, 0 deletions

diff --git a/dev-lang/rust/Manifest b/dev-lang/rust/Manifest
index c7463b7a0a1e..c7a5acf42919 100644
--- a/dev-lang/rust/Manifest
+++ b/dev-lang/rust/Manifest
@@ -30,5 +30,39 @@ DIST rust-1.57.0-x86_64-unknown-linux-gnu.tar.xz 151033748 BLAKE2B 61ecece6a8aa3
 DIST rust-1.57.0-x86_64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B ea41b27fd25cc75efac73203688ee0882767fc76a2fe09b5e424c42467d3e332463c5560cc58f3b20f6e4b44289a25cfb0d36e38a7a9a7b3950ef875a59dc9ae SHA512 8b955bfce6c130e4b95054b98646f7f9b89e621256759ee1ff533df5f777312dd7adbb192ee0076c9b9baa6883a74a9def50ef598ba8c707762290d465c9a8b7
 DIST rust-1.57.0-x86_64-unknown-linux-musl.tar.xz 260333980 BLAKE2B 75342ae8637355e714d5217d78604cfa6a601d3f9bc0ed4667ff0ca57c6521567b19b9bdb10f79761e2e5fd21ca10e12f3fae0c65791118fdb0c35f8f88349f4 SHA512 204ed493528757b8e3e8df13d062c9ae74c75c3e3adc1a2efc0dfc33d2525629168a558dd32653f44a4365191bf203a4415a77152276288a8e122e6bd587394a
 DIST rust-1.57.0-x86_64-unknown-linux-musl.tar.xz.asc 801 BLAKE2B 506400c3ea70469cbda0e492e85d41b7f94fba790ec19d1c3491bf4a00d283f97c8fb37319ad6c4a43b22a2195c21d1b9e3c16a5b2a9a82833ff61ad49bdc793 SHA512 793369dc7a854c48a72d81446a0c8eb9d83a071af77758e0bcbb8e4d518fb87c5a23c085202b9b427a02bdd772ad9c82724b34295b851f26f384c3e801bf9a04
+DIST rust-1.58.1-aarch64-unknown-linux-gnu.tar.xz 229585460 BLAKE2B 301b201cb40249005a1a8adf34ffdb0bacd22e1d919a24dec9bb8331c2243de1b7cc312c91a87fc9e11091cd9ad517347ff09143000d9de051b3c9a6e0780f9d SHA512 04e2cf2116e16fa293c7f2d29816012520b41df44b54657e289e7affbb91af5a5001d140a49aab1286451b93e93b0171edea77f61f01085136d1be1a3baac4a2
+DIST rust-1.58.1-aarch64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 6da55597fddd643350c73f28a15dcfa935529c0878a199819b9bad6f3ea2542f9021e24bc1a6c8724ff14d36007c00f8906dd1aeaff33b0a99ef6982e8f711b3 SHA512 57debe0afe52c3af3eb53e4efe70ba194ddad449d9952174f8a775531b83f8ab0d66462e7bdd06712547e8f675d330a151d20d183daefe1dda2f0e3805695714
+DIST rust-1.58.1-aarch64-unknown-linux-musl.tar.xz 226068748 BLAKE2B 7f9680b0ad3f9a8349f3032f63d23b6d96ab43245d3025d0e4307a29b4353fd2408e7de572a10a77b261634b8fd4e9e6054ba9955b2440b608fdad2c88c12bfa SHA512 6400221a8ae04aea91f9df0f8d82585bcd380f22e80fe813eaa1cadbf592c5207665ad008d938b399e34fc2cb0485b16f993f94d431c290a69a696a4faf89e05
+DIST rust-1.58.1-aarch64-unknown-linux-musl.tar.xz.asc 801 BLAKE2B fd22d8a3157a11df45e166b8c961a435bedb079254c1d7f0a738adc1065169a03c897a32bf8781802ca48bcb983c761e6985e532c0d76e90c3684752d8cff9d1 SHA512 54fffa8120fc6b86c57faffdc7857adb89e5fd217b0e753e76e6fadc54aa086243cb7ba3c2c49ec4f44ea8538223312469908d24add2d28203f41c16e9224204
+DIST rust-1.58.1-arm-unknown-linux-gnueabi.tar.xz 206480968 BLAKE2B 32ab78a1567d31bb1b5ca36fcb14fd1b002675baab0f688f931cef6524ffcee4257e00fa25a848f73f25656ae0b58beb0e862f1a36d4d5fad016316af3d1ab2a SHA512 94e7cf238235e845761e53fb5802ef0ce3a02c4675001cf67d05bc565403ec1d54293557d73dce7396147381c331ebfb0313e473289c05b65541f836dd8b4e6b
+DIST rust-1.58.1-arm-unknown-linux-gnueabi.tar.xz.asc 801 BLAKE2B db3275db531d78d728b33678be3869738009b65985aa3ad4f38aaa853cc1b84a1d2a89f98e203f697c457425547b80ad5826e7c820d49c767b5cd1df2db93bdd SHA512 fcca26b6b0dd2e7529efc93d1c4fdfcdf55c85f40bc247b3af9741403a085bc6808cd304ba535786dd2debbf4952c9d9fab62eaa61f1d3d8e59ce78bda992eb0
+DIST rust-1.58.1-arm-unknown-linux-gnueabihf.tar.xz 206545444 BLAKE2B 203a562ac448e7efc4fd519d98937f2deeb70c931611a6f0efc87947f5c48cf0c0cb85358fb9ce1dce49bdcde015fd2d5fd5f3b149d7370c05649579522d228c SHA512 5c0404d878300c1a47597bdadff7fe93c3b0a115320dbf5299dfb4fd06ad322217f4b630429a9db3a5ef54c56706c1ebdf512fcd663f379f1c2df0cf3612459e
+DIST rust-1.58.1-arm-unknown-linux-gnueabihf.tar.xz.asc 801 BLAKE2B bf26f6540d96d124bb503b6e38acd87dc16ad16c5214559edd26f4f4f94f1f06a7059a09a7ee504721130576d6ddc5c7b2550f7bc0edffcef37bae3c0abb618c SHA512 1fa1e533adb1e355411cfb706b7c47712454547966bdf07687d9b563cf5dba9b4419d646227719a9362eb923c597f8461c194e56efcbed699610faa209985df2
+DIST rust-1.58.1-armv7-unknown-linux-gnueabihf.tar.xz 212381428 BLAKE2B 0cbc4ace0b7693de1898f160d5e76c7ff993aa8e8135a094b23dff736326ff7616471068f02a064d2b88c816fbf6f943fdaf82629dcda0e0e07b6a4a3941fcef SHA512 c1dabf7281c754d3c89044b1277618b0e928efbecde47ed98133d3f8664722d5b3dfb5fbf485cfb4c98c53d3101b192070c5c41e4395cd8563b0e8415abdf2a1
+DIST rust-1.58.1-armv7-unknown-linux-gnueabihf.tar.xz.asc 801 BLAKE2B 85f3892a41dd381250219cb0c0c8e70b3902e5356ad34066a6db319193dd580e609975e38356097b7ca0907d62d188459c5a72783c95e77f1d08a50ae8673458 SHA512 70a2269b8326ed8b5e53dbd6698237c4d843086a139c4f4ddd6e04625f0defbcaff46149981e5a1502d56da1393b01bc0c6f74fa8e6ff407f6eb45cc5638ed41
+DIST rust-1.58.1-i686-unknown-linux-gnu.tar.xz 224773372 BLAKE2B d90db8b20611f6430759399bbccd0359f2b64ba9b9aa50312ce51dd4a43728897ab5c31d3c6bbee892db8e6e500a19184eb325a312231458cf99bad7c6f04b58 SHA512 0cfccc77cf62002ad99751744ae5a910d48c142d596eb88e187fc061c4b3a8cc1d99634802bc06b0302c41bb3462a17453af1beab6ca694a1535a1b20e10fa47
+DIST rust-1.58.1-i686-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 1fc809defcfeb240f756b3e7158d3e747b2e21ea81f3029618c58c4070070a2068603a4e93f7928a9ec3d120d7b2c7cd944d1ae03ebff1b9d5baea823dba54b7 SHA512 aba1f533227794755ca81c2bd8a3bd35fd9ad4affe5bd39430e0329310fe6c6f813fa7d95790958c61c6b22a4e4fea3488e406f05fa30c27eb6871f71e2e6e5d
+DIST rust-1.58.1-mips-unknown-linux-gnu.tar.xz 164572088 BLAKE2B 117dcc6483652c3f18436e185b44d605e64b9b31634484ead2d86c1caf6ec47a53eeded5dd766e2410ce59dfcd3f7e71ccf924afab0f34988e00e4c9324a5f13 SHA512 08df5ca03f786aae814b7a22a7d05e18107a1f185338880ea1b58df23d6b1d5c9f2359650ad38c30058a2d2d6f8ae32dffc3926ff47fd3342049c2251eb48463
+DIST rust-1.58.1-mips-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 275a43c158a444c3ab27f1e45a9de294a059c21edf7280482303b83f6b0eb65d309021a82c49410b5b24828b88f65888529e95b01886ad20f2f4c187f595b788 SHA512 c70800d0629f92e4640a64a276575b5d6c1e92c2f1b6c7ca025c98a93a2665cbd7192d2fb697c421adc34fe397297c4cb78e21b38f27fa4261483cbf423f933d
+DIST rust-1.58.1-mips64-unknown-linux-gnuabi64.tar.xz 170025876 BLAKE2B 05cac890ccb9e37faeb3d995555b6f7f52281619101f033038ef056e7ee75b0c5eb2bd14357c1f8b0f5e96b9e2877514ee870bd75be1b28dce4906be95e6e3b9 SHA512 7d2fc1f0787f828fed72b1681f2668bce7cf25a87a01a818dfec18eda0fb63fb4a5e4aad8115e93dc4c8398641db4a476dfcaea07e6826fdcea727118c64e286
+DIST rust-1.58.1-mips64-unknown-linux-gnuabi64.tar.xz.asc 801 BLAKE2B fc25396963178a21a5b0a999e8dd3c9520b3056483ddde1f8a284747a078db0dfb0e808f2292704680e37c5cb2db990ad8311efdc0b32e2a65fd93d389c2a09c SHA512 32ab00c666c33ab53a975e9abffb7645d2101e8f508ea67d2e63b1ec01b4785e384bfe2966ca237b5494e34c2abd15e509835fa161709ddbe1c69845f26a6f43
+DIST rust-1.58.1-mipsel-unknown-linux-gnu.tar.xz 169136184 BLAKE2B ae698d08e2592b32b5a0927536e1c2a506c2782f9449fe20242d2ebbc5cbccb2d3a53874b973d88898157b233a88ed80987e2e83a316c05c0d478b1021c49c41 SHA512 ccb13dbb41c92956a437d0879fe9d3ad0a2aac88fa1b761e3b68a6536e389ed4997d1682730b2078fe01e68df0ef64bbe43dd2d64595dbb4ed388fe59e1d6dec
+DIST rust-1.58.1-mipsel-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 6b14cb176bb33207aed7a01de755390df0f71163940fa8121b51dccefb018cb4dd1cfe9efc359f6bb941104b8b08db0cb5a94c3af880058e59904884c5dff3e4 SHA512 1e30495303f9c6289223a2970d419a70885a866468717254b3efa5124e21cb06830692cfadca33ced94a383d1b9af43b70c08235e935ee491a1de50eafba96b1
+DIST rust-1.58.1-powerpc-unknown-linux-gnu.tar.xz 183853716 BLAKE2B a2b98d2c55b5bda8647301536bc8e95b72f98f41018f9b7574f85756d2cd2980fc3a3e995bdd0ed5226b7f18357c5aa3c2f8a05b1679d3dceeae6dfac7484f15 SHA512 5b9010bc3685889411fab6a06727a320123029c037a01cbd5b69f037a87ed595362b698264954b2d3dc2adbaf422fd54d7b56d81512b62147c1922aae77afa22
+DIST rust-1.58.1-powerpc-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B c428bb51fdc740ea9499a1a853f4be93a53c23e59d5142d33bf103ac46e32716505eea3e45174ac3b88ffa12caa4dc010dc2d02093f397ce45b4af27f5c4191a SHA512 b3ac66cc88c75f77f7f9632c2104f45a6a730a83b75bd7b531dab833e8e5b512ef06bfea433111302f64321b688f0817b95c5eac9fddd8ff44bb49934a616eea
+DIST rust-1.58.1-powerpc64-unknown-linux-gnu.tar.xz 194177236 BLAKE2B bb0c23288014207123345deb06e40a45221d0149e8563c374810892b68cc2b5838b5c3f8c630522723daa633c5fbf72aed16e977313a6d1ce27697c22552681e SHA512 8a089c44d2f50d4677a6aa82e6308d47451ca588243e0df3fbbfd13768002f0caaabeca0d6a7f113b8f63477565296e5cb89f27760621a327cf9cb5b4999eeb5
+DIST rust-1.58.1-powerpc64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B b94fe36ab1896bfee3d7e7f2b17dad05d33c672407955fe45758d167bb1fb4df4d33040e6d18dfa966d33133e181ef9a0e7dd04784ed80e30b38175a901859e5 SHA512 6edd981ded134e0c2e6198014ff37868d7e71d0d2185284c28a35450ab226ffd460faeb29e8aea6d5e75a2fa94874e01c9987f1f1470efe061859d06f3d3e605
+DIST rust-1.58.1-powerpc64le-unknown-linux-gnu.tar.xz 203175404 BLAKE2B 53ebdad5859fa7a5e2cd79ea31595aef65a8cc54e11d887f04385500aeac6dd886273f7736271aeb71c70e0d512fd986f09b54ed1a9c744432688eb71c74edb0 SHA512 abaa2b749987b4a1dbc20cc3dfdccc694bce0d1e126d8e9c03dfdcaf85c5be2a2d28f9877ccdaec847c499d7044f955a70f454dafb24dc59ecb5854807eb2289
+DIST rust-1.58.1-powerpc64le-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B d5cdf7cfca4d881931a08bf67ca1c08fafda621746b01b8e12e41cd88f5ba8107c1bc86b70f84eed4e6137f6d92ae712740b57505705c7bfd3454d8ca1131eb7 SHA512 39a9649ac0645ea6df93cef59baa6d197b9cfdf88f0c1b3846e52369c8e3e293ecf9327cfa6b5457be65896380c13445ad05c3a0cc213da0ed9bba3c12ae9b8a
+DIST rust-1.58.1-riscv64gc-unknown-linux-gnu.tar.xz 196828436 BLAKE2B 9b38c585146f0832d9bc1bebbdab086f351bc88c27817e44ff251c1566b80ee5e573b59764a22802d246023ade332f861096f2e68504c7b64400754ed2676695 SHA512 d268e5a45542f7684d52b694baf5c9b504837fa43d2f5a298e3fb4e335bc6789cdb868651614fbcc1d55c13ded1b2134d57103f46b098d0a8d4a7fd58fb10b03
+DIST rust-1.58.1-riscv64gc-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 7b234a9fe76cf39177ebc6ad54799bce80fef97151c257b58ae08321c5fe427dd5b5a70627b5a4011e32560f63f6f7b6fddb42e58728004406aec6a9e7597eed SHA512 ee4a1c52cc623dd1858ce8d363f0aaccd58b8bed27a0838f399f1b5cc51f0c123d98056147a266f45724b6a25b09b11c7224c4bc01f208ff7d77e906c850aebf
+DIST rust-1.58.1-s390x-unknown-linux-gnu.tar.xz 198204996 BLAKE2B f6f325a10aa9c16510b77b7729410d08d09b83dadff3b8ef7e06642d8c6a50a153eb17cef338fe3e3b7efa3a48ae0e318414aea794f2f488d6f59852310bbbf0 SHA512 31ce8b53c50063c9409191beab28f67ab804549b5eb4d6bfaf42a3342ccb2f4dc039e3afffe22d87664917481e943018c0d1239e7dd0a62af34c44a975f69303
+DIST rust-1.58.1-s390x-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 995a6ce146b758bcad983fc8d7a8613b0da172c7e62a0b73d206cfd461e1046d024a8431ac287b5c267b215128542bf20d796b072ab1aed348787f50013a1118 SHA512 d7af25ef9bb92952949e7f91a13d5e910f32134b962e6432bd10ed885be451eb99c518213d9dd4c425c40ea43fa2722d6ea7c357ab0ec63b8ca4f7d020412979
+DIST rust-1.58.1-x86_64-unknown-linux-gnu.tar.xz 150229600 BLAKE2B 056e5a646d6758ac88e2b2b9309dbe0e9d23a285be31ba009eed936c82923ad9615874b8689ef926b14335d6c5255df41b5879794e6f0982b90553273487853d SHA512 7a61ecc8ff49769847ed4021c57279c16f261aa21469da426023fadab3820d0d962edc0fb04861ae23c8dcf821fc3ab99c2d469ba827dad30c1acc995732605c
+DIST rust-1.58.1-x86_64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B b86d3d2cbf27594dfe55fe2ff52523a9dff08d08ddd30526172f9e07760c2f854698eb8153cb9894588d75759a3d0bb7887756d005a2c69aa9cfeec8e7dee678 SHA512 82dcb22efb94bb19f2338e9cb46e3f6da3d189fe6bff12bf1ec870197d395c2ad58bd15705aa7f3cde38e5ec0266e20eb2e45761e0f55b13261d3e6b14dce60f
+DIST rust-1.58.1-x86_64-unknown-linux-musl.tar.xz 262511608 BLAKE2B f2ca664fe1ab0614f13ce9d7764eed935b107b393830ad14b64d8b05e032feeec57dd04cdc963ad3eea2cb23558beeb1975722be93412d4ff8fd3a75d2bbb896 SHA512 d064464333a64f91b8a30f267ecfe2b4dc5be6d639bc9f064efa86a54478c8de7156166236b7ff8d96bf8fc8cbbeebf7ac17d8b5dabf24d72e189dbbd8ae0819
+DIST rust-1.58.1-x86_64-unknown-linux-musl.tar.xz.asc 801 BLAKE2B 9c58a08b4e5d609230b5aae52fe7eec2dd6a0cc0eb8c257068ac2585918aba6cbe3263a6480860d34a117d3e2ee835fc8d8b1702296369c3a4e0f660f46bd62e SHA512 6c294cbbbf22940e36278e92d5095dbfee0df741694188ef1e6df7740bbe770ffb5b2467bab12825045ebf7d6fb12eebb1ce7edbb32d0afcb114c57e814fe5d7
 DIST rustc-1.58.1-src.tar.xz 124353160 BLAKE2B 686c7272db544ad46f7fb01b4e05f24f4e08ff959a000cadfaef5d8fc413b93f5ed839077bc9715defc7a0a179af091f65c7a5d7104b0b3153f0654c237c094b SHA512 eff3279d2e519343cea542a9ae2daab592e44f35af344e33ff43ed55fc7c824511790d1991dd36a603d12465de8c3688e7194c2b9557f288c587ffa04738c2ce
 DIST rustc-1.58.1-src.tar.xz.asc 801 BLAKE2B f0b600a503b0ca777dd5d690dca7252ecc6d7d49ca4a9cc8edc0647038f727e9052a861f9868292f837d78d6b02efe9ed5efa85843262c44cf6f73254cc7c9b0 SHA512 983c1ffdc4febf8bce6efc123c76b13f233772bc0a152ffaeb7ebf8f1f7b82a6b5d653407a4d293953d6fbf62c0df4ff4d398a1133061b53ae0f85317a14380b
+DIST rustc-1.59.0-src.tar.xz 128942756 BLAKE2B b28114f14c9a0fec7db56fde79a985360fd8438c3b14eede49ed12e540c2636be960d0fd800c569af193886ac76fe8bf604d5dae59214ae08cb0cc6cc0ca404e SHA512 acace866871d13a55d365f65d7e15c192c3cd33096862571df6317e066b7474d668b95ae281e0244967778c05f1e33966c3c55616218bd25d3770a2b2d4f0365
+DIST rustc-1.59.0-src.tar.xz.asc 801 BLAKE2B 061701c4fdbde930798f9f938ca3642204ae4a2ad9396937ca7d604268813d6d68f4979f20d35abdbbfeec0bb389acd86c9d3d84256db85861f6b11e3dbef80e SHA512 1b90bc01f9d68ba1f70591c4ae707295d7727b790d170a0b757d654684e59d3c26c45b66a21f9ac762debb6867494660c73daaf10be9bd567a38be44c0009f72
diff --git a/dev-lang/rust/rust-1.59.0.ebuild b/dev-lang/rust/rust-1.59.0.ebuild
new file mode 100644
index 000000000000..3d97be4af509
--- /dev/null
+++ b/dev-lang/rust/rust-1.59.0.ebuild
@@ -0,0 +1,705 @@
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+PYTHON_COMPAT=( python3_{7..10} )
+
+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 ~ppc64 ~riscv ~x86"
+fi
+
+RUST_STAGE0_VERSION="1.$(($(ver_cut 2) - 1)).1"
+
+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 ARM AVR BPF Hexagon Lanai Mips MSP430
+	NVPTX PowerPC RISCV Sparc SystemZ WebAssembly X86 XCore )
+ALL_LLVM_TARGETS=( "${ALL_LLVM_TARGETS[@]/#/llvm_targets_}" )
+LLVM_TARGET_USEDEPS=${ALL_LLVM_TARGETS[@]/%/(-)?}
+
+LICENSE="|| ( MIT Apache-2.0 ) BSD-1 BSD-2 BSD-4 UoI-NCSA"
+
+IUSE="clippy cpu_flags_x86_sse2 debug dist doc miri nightly parallel-compiler rls rustfmt rust-src system-bootstrap system-llvm test wasm ${ALL_LLVM_TARGETS[*]}"
+
+# Please keep the LLVM dependency block separate. Since LLVM is slotted,
+# we need to *really* make sure we're not pulling more than one slot
+# simultaneously.
+
+# How to use it:
+# List all the working slots in LLVM_VALID_SLOTS, newest first.
+LLVM_VALID_SLOTS=( 13 )
+LLVM_MAX_SLOT="${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}[${_x}(-)] )"
+	done
+	LLVM_DEPEND+=" )"
+done
+unset _s _x
+LLVM_DEPEND+=" )
+	<sys-devel/llvm-$(( LLVM_MAX_SLOT + 1 )):=
+	wasm? ( sys-devel/lld )
+"
+
+# 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/${PV}/src/stage0.txt
+RUST_DEP_PREV="$(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-util/cmake-3.13.4
+		dev-util/ninja
+	)
+	test? ( sys-devel/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=
+	elibc_musl? ( sys-libs/libunwind:= )
+	system-llvm? ( ${LLVM_DEPEND} )
+"
+
+# we need to block older versions due to layout changes.
+RDEPEND="${DEPEND}
+	app-eselect/eselect-rust
+	!<dev-lang/rust-1.47.0-r1
+	!<dev-lang/rust-bin-1.47.0-r1
+"
+
+REQUIRED_USE="|| ( ${ALL_LLVM_TARGETS[*]} )
+	miri? ( nightly )
+	parallel-compiler? ( nightly )
+	rls? ( 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}/${PV}/lib/rustlib/.*/bin/rust-llvm-dwp
+"
+
+# An rmeta file is custom binary format that contains the metadata for the crate.
+# rmeta files do not support linking, since they do not contain compiled object files.
+# so we can safely silence the warning for this QA check.
+QA_EXECSTACK="usr/lib/${PN}/${PV}/lib/rustlib/*/lib*.rlib:lib.rmeta"
+
+# causes double bootstrap
+RESTRICT="test"
+
+VERIFY_SIG_OPENPGP_KEY_PATH=${BROOT}/usr/share/openpgp-keys/rust.asc
+
+PATCHES=(
+	"${FILESDIR}"/1.55.0-ignore-broken-and-non-applicable-tests.patch
+	"${FILESDIR}"/1.49.0-gentoo-musl-target-specs.patch
+)
+
+S="${WORKDIR}/${MY_P}-src"
+
+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=( $(eselect --brief rust show 2>/dev/null) )
+	rustc_version=${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 ${rustc_version} to build"
+	fi
+}
+
+pre_build_checks() {
+	local M=4096
+	# multiply requirements by 1.5 if we are doing x86-multilib
+	if use amd64; then
+		M=$(( $(usex abi_x86_32 15 10) * ${M} / 10 ))
+	fi
+	M=$(( $(usex clippy 128 0) + ${M} ))
+	M=$(( $(usex miri 128 0) + ${M} ))
+	M=$(( $(usex rls 512 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}[${LLVM_TARGET_USEDEPS// /,}]"
+}
+
+pkg_pretend() {
+	pre_build_checks
+}
+
+pkg_setup() {
+	pre_build_checks
+	python-any-r1_pkg_setup
+
+	export LIBGIT2_NO_PKG_CONFIG=1 #749381
+
+	use system-bootstrap && bootstrap_rust_version_check
+
+	if use system-llvm; then
+		llvm_pkg_setup
+
+		local llvm_config="$(get_llvm_prefix "${LLVM_MAX_SLOT}")/bin/llvm-config"
+		export LLVM_LINK_SHARED=1
+		export RUSTFLAGS="${RUSTFLAGS} -Lnative=$("${llvm_config}" --libdir)"
+	fi
+}
+
+src_prepare() {
+	if ! use system-bootstrap; then
+		local rust_stage0_root="${WORKDIR}"/rust-stage0
+		local rust_stage0="rust-${RUST_STAGE0_VERSION}-$(rust_abi)"
+
+		"${WORKDIR}/${rust_stage0}"/install.sh --disable-ldconfig \
+			--without=rust-docs --destdir="${rust_stage0_root}" --prefix=/ || die
+	fi
+
+	default
+}
+
+src_configure() {
+	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_targets},\"$(rust_abi $(get_abi_CHOST ${v##*.}))\""
+	done
+	if use wasm; then
+		rust_targets="${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/wasm_base.rs || die
+		fi
+	fi
+	rust_targets="${rust_targets#,}"
+
+	local tools="\"cargo\","
+	if use clippy; then
+		tools="\"clippy\",$tools"
+	fi
+	if use miri; then
+		tools="\"miri\",$tools"
+	fi
+	if use rls; then
+		tools="\"rls\",\"analysis\",$tools"
+	fi
+	if use rustfmt; then
+		tools="\"rustfmt\",$tools"
+	fi
+	if use rust-src; then
+		tools="\"src\",$tools"
+	fi
+
+	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="$(rust_abi)"
+
+	cat <<- _EOF_ > "${S}"/config.toml
+		changelog-seen = 2
+		[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)
+		$(case "${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)
+		[build]
+		build-stage = 2
+		test-stage = 2
+		doc-stage = 2
+		build = "${rust_target}"
+		host = ["${rust_target}"]
+		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 = [${tools}]
+		verbose = 2
+		sanitizers = false
+		profiler = false
+		cargo-native-static = false
+		[install]
+		prefix = "${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 = $(usex debug 2 0)
+		debuginfo-level-tests = 0
+		backtrace = true
+		incremental = false
+		default-linker = "$(tc-getCC)"
+		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
+		[dist]
+		src-tarball = false
+		compression-formats = ["xz"]
+	_EOF_
+
+	for v in $(multilib_get_enabled_abi_pairs); do
+		rust_target=$(rust_abi $(get_abi_CHOST ${v##*.}))
+		arch_cflags="$(get_abi_CFLAGS ${v##*.})"
+
+		cat <<- _EOF_ >> "${S}"/config.env
+			CFLAGS_${rust_target}=${arch_cflags}
+		_EOF_
+
+		cat <<- _EOF_ >> "${S}"/config.toml
+			[target.${rust_target}]
+			ar = "$(tc-getAR)"
+			cc = "$(tc-getCC)"
+			cxx = "$(tc-getCXX)"
+			linker = "$(tc-getCC)"
+			ranlib = "$(tc-getRANLIB)"
+		_EOF_
+		# librustc_target/spec/linux_musl_base.rs sets base.crt_static_default = true;
+		if use elibc_musl; then
+			cat <<- _EOF_ >> "${S}"/config.toml
+				crt-static = false
+			_EOF_
+		fi
+		if use system-llvm; then
+			cat <<- _EOF_ >> "${S}"/config.toml
+				llvm-config = "$(get_llvm_prefix "${LLVM_MAX_SLOT}")/bin/llvm-config"
+			_EOF_
+		fi
+	done
+	if use wasm; then
+		cat <<- _EOF_ >> "${S}"/config.toml
+			[target.wasm32-unknown-unknown]
+			linker = "$(usex system-llvm lld rust-lld)"
+		_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:-}"
+	env | grep "CARGO_TARGET_.*_RUSTFLAGS="
+	cat "${S}"/config.env || die
+	echo
+	einfo "config.toml contents:"
+	cat "${S}"/config.toml || die
+	echo
+}
+
+src_compile() {
+	# we need \n IFS to have config.env with spaces loaded properly. #734018
+	(
+	IFS=$'\n'
+	env $(cat "${S}"/config.env) RUST_BACKTRACE=1\
+		"${EPYTHON}" ./x.py build -vv --config="${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 ${t}"
+		if ! (
+				IFS=$'\n'
+				env $(cat "${S}"/config.env) 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: ${failed[@]}"
+		die "aborting due to test failures"
+	fi
+}
+
+src_install() {
+	(
+	IFS=$'\n'
+	env $(cat "${S}"/config.env) 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 rls && symlinks+=( rls )
+	use rustfmt && symlinks+=( rustfmt cargo-fmt )
+
+	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"
+		$(use amd64 && usex elibc_musl 'CARGO_TARGET_X86_64_UNKNOWN_LINUX_MUSL_RUSTFLAGS="-C target-feature=-crt-static"' '')
+		$(use arm64 && usex elibc_musl 'CARGO_TARGET_AARCH64_UNKNOWN_LINUX_MUSL_RUSTFLAGS="-C target-feature=-crt-static"' '')
+	_EOF_
+
+	rm -rf "${ED}/usr/lib/${PN}/${PV}"/*.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-${P}"
+	fi
+	if use rls; then
+		echo /usr/bin/rls >> "${T}/provider-${P}"
+	fi
+	if use rustfmt; then
+		echo /usr/bin/rustfmt >> "${T}/provider-${P}"
+		echo /usr/bin/cargo-fmt >> "${T}/provider-${P}"
+	fi
+
+	insinto /etc/env.d/rust
+	doins "${T}/provider-${P}"
+
+	if use dist; then
+		insinto "/usr/lib/${PN}/${PV}/dist"
+		doins -r "${S}/build/dist/."
+	fi
+}
+
+pkg_postinst() {
+	eselect rust update
+
+	if has_version sys-devel/gdb || has_version dev-util/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
+}