dev-lang/rust: Add 1.80.1

Signed-off-by: Randy Barlow <randy@electronsweatshop.com>
Signed-off-by: Joonas Niilola <juippis@gentoo.org>

2 files changed, 817 insertions, 0 deletions

diff --git a/dev-lang/rust/Manifest b/dev-lang/rust/Manifest
index 9a6d48b57d73..9feed34ddf31 100644
--- a/dev-lang/rust/Manifest
+++ b/dev-lang/rust/Manifest
@@ -228,6 +228,34 @@ DIST rust-1.78.0-x86_64-unknown-linux-gnu.tar.xz 163959816 BLAKE2B 1987a6a0ea169
 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 rust-1.79.0-aarch64-unknown-linux-gnu.tar.xz 224366944 BLAKE2B bd890cfad2348f7bf1d97adde1a5ab244665474ea4d77dfc2cec60679829f84c30378f2a979acc3dddc51ce563b03ff86d04903602a079a85684d98a86ffa4ce SHA512 0cf80ea35cb501f406323a438ecca348fb957cd4a57a4c7ff42bbaa0c736d16a99187b821e29d2e51519e1cb76e533af7c5893c6204fc0736f8e2186235742e3
+DIST rust-1.79.0-aarch64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B c249d0badfd29130477841602b385e1d152488d43799e9e3b77cf92234b197501182edf59536f77b02b49f806a7dcd748f352458f97f15af6c8f0580659d3eb4 SHA512 2cd2fdde6ad1acd769af2a3ca97bff3e4cf3b57a3a7d1890ab592d2abb85be17f7c3f27cc1b994e70f9f6cd52e8e44314d1d182aafbf68fea4d52df1c9482afd
+DIST rust-1.79.0-aarch64-unknown-linux-musl.tar.xz 205404384 BLAKE2B 21dd98d62bc965e24b3a60c0e48fdc907e2bd6919a90923f26cb833218d6e1f23d3385c7e67d96d7651d65ef963f668abd9f1c9e4d3e80aeb726b50d09a2ca80 SHA512 358e8b8a76e1a48d6829735f04b2d3cd3ddae86684ba10c778a9f96ce4bb0f080c0d706bcf5c6d141d1d52685a8e92a48d8020008320ec8aa158fa911745678a
+DIST rust-1.79.0-aarch64-unknown-linux-musl.tar.xz.asc 801 BLAKE2B 99fcb4bb3818cf56ab9686aaede04dc104d156cb8c7989c3355974901cf7b84d9182239b526bc0208d7f4bbd80f959f896934796d1d431336820e10477c271c6 SHA512 9ce170419411e08bdb80aaad72c559fd0d81d7e5c2f088359ba2994dbc9a1f25bd6a35b2e3a02ac2ead12be6dac3d8cdb48764e85f8aea3babc031e242d66a5d
+DIST rust-1.79.0-arm-unknown-linux-gnueabi.tar.xz 189377704 BLAKE2B 6d2e12a9fd86d41dce2946404130fc314ce291e1610f1bdbe13214e04ccf91ef36b373d49bb06d4f871da1bf99568d194d27aaecde841634fab1fd222e44563f SHA512 630973e33a82d4dc27ef6ec07084bbb0c6555add6fe1324b0a743c39902ce02ad1b3142b3e56b6b37678b523ff37fdaf0f60518a83500ceb4db9544e7f60ac7d
+DIST rust-1.79.0-arm-unknown-linux-gnueabi.tar.xz.asc 801 BLAKE2B 26045e38094ef9e424bd7050819c43998f9ddcd54f52c08b2f9d538e2729b1af1015847b55501a55d43db073f63324aaa594ba3ac27989665cb0855f58275b22 SHA512 73a365ab6ba6938f21e2f29d2ee8992e32998d159572a137621d451837dfb05b6f0bea8985165c6c22f16ce66d6f732393c8dc7680f2ac31df006b0cc2d26533
+DIST rust-1.79.0-arm-unknown-linux-gnueabihf.tar.xz 189222624 BLAKE2B c9ce961bd7f7bd8fdb05781096162f89bb2aa374963dad03f764a69570efb634a5c0fb3f776755869649a69ac1a95830a78e638f6e06d4840f1b2c2dadcac2fc SHA512 787e02c3b6415ed337964ff4db0d0e8cf5642f65ff733c6d70119c3ef328e9507ff66c5b2e4191bc0bcd1dd6755b656efd3d46b7629f3d20079f06d8fadcc10d
+DIST rust-1.79.0-arm-unknown-linux-gnueabihf.tar.xz.asc 801 BLAKE2B c5729c56ee5a3efed7f8f5af46e459a844f67a87c71c9e280efc07771964fd06838263f254a19801bd6d072d98f3d326691add5495c62a8d06f74a39375557eb SHA512 0b1d5c144d8a9bc8d370052ddafe7d6a5b8fdc00038bcb2581c5e4787a1c8419c628bdd12398cdac94178cd6c876f10e23b5660755274e0f1648b86e54d78477
+DIST rust-1.79.0-armv7-unknown-linux-gnueabihf.tar.xz 194892388 BLAKE2B 82113120753281bab2e52dde18b399e878bc1c055e2a1123c7bf5e0432c39ce04cb24886ebfde6094683046af94a8e80d456647980632df8da65268c4461e857 SHA512 d923042c4c9db09ff62444e6222bb4c404f322b2c43722514bc4c126fe1f9988cc8c38191bd66f8f24c535509c683e9fa30b3091d40a118b3366062135aef7e3
+DIST rust-1.79.0-armv7-unknown-linux-gnueabihf.tar.xz.asc 801 BLAKE2B 2cc6281091bd0dd012fe0d229aa0691fc3698ebac5bd77d8c2d811907d1a6d8fe73f19d4b456bc9619f6e7cc403e8d55c46fd02140103a72f5b82c2c2c3986a0 SHA512 4aa5854d7430b07550d72f3aa3d8b5f27d8d11542c9bc22c8088624fa1dcb2a6d194cf058e741b1a0eebbf04874aa844ee89511ca14ddf73568eccbc404d6a43
+DIST rust-1.79.0-i686-unknown-linux-gnu.tar.xz 220956232 BLAKE2B ab8bfc213938a0c512177765f4d5bb2333f5533506fb28ecc70744c545595a7e534d7e5dad5afdd6b7d6570bc0602ed7ed68de7df4d7a210c606e23cde5fb6e2 SHA512 7238d0102625d82f7595bf4346dc49cb83daa0ea0ab456b6526f4995d20e5ce7f10517bbc3de09937eb10a4c537edeb2636127f9f8aa7d45c7577a665d70820f
+DIST rust-1.79.0-i686-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 838bd51b74f1f6c77a5ad10cf992f3e398f2f68510685d1146ea3b15bdb2ab7a994aec3e96b5b3a1a14a82c082a87c8cbfc77f01609bde2e096f1934a1fa61eb SHA512 f8a2aa8271348761c5c8c93406c65fdc05502c8d21d67fff82f1a706770891a820bd05acf8d3e8401a44a66c35a11f40e3594d5b42b6554060b3bb58a0dc6afd
+DIST rust-1.79.0-loongarch64-unknown-linux-gnu.tar.xz 171612592 BLAKE2B d06003c1817a191d8aea38068ad03449090538962aa9ae74423343032b2e1aae4784daa702fdee4f4b089341fcbac1d03048783b7cf082eee46df1a2b6323b31 SHA512 86c39ca2b43fd58893e490008c99ce7f8e8c8e087701b90838de8f589a3e5b5b0d3b20c86ea9803da2ed72301d44b68866fe219b65a5af9f0e7e3120b3d9b994
+DIST rust-1.79.0-loongarch64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 6f826cc05d126b8c6422674c9dfb496a61424144d7a76bf4e5225d7bc782c0d63dd55ea03c534494b633601bd027a922458d9f06dec5f5cf701c8907fe53cbf6 SHA512 c443a8a08ae2e65e3ff46e4b5f910ac24b8dda0ba62b67dd41888cf1504a78e9a6ff9415480b8c684a7f9390bf7b279e3fb7a7a22bc4139d6a91457753df4131
+DIST rust-1.79.0-powerpc-unknown-linux-gnu.tar.xz 184251688 BLAKE2B 372338527063379f922bb3ea83c98f21b2201cf0e75f61cb0a42c1c1c6b651eeab1532d972af72a2afdc7afb5e7a96c40b0482c248350b7886a1274c869d2a08 SHA512 e1a26ddaf53b070edaa630bfcf6ba94659f841804e2feb90fab05e8856cc616d413f5af45b67cab57fea2483221c8caa52e373e7e7d29039541ab2142c4187a3
+DIST rust-1.79.0-powerpc-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 22c2867d40f0fe13888112294ea2571718064a30983903f7ce8b13a4a13684c34ac224990ebb0254e262686c097bed6e46d9a70e86bb282c447c9e690ef551d8 SHA512 68ea8142bb72430fadf274549d1830a8348ba74a02a52bdab1cf1b811e70592896f8cf9d34687bacc34aaa06603f89e5794211227c573a4f29ed34744b0f5a2d
+DIST rust-1.79.0-powerpc64-unknown-linux-gnu.tar.xz 182063040 BLAKE2B 0bf5d662cf69bff1a345dc54525319dfec98b2743744eb03712e9a2cce8cd45d968b9cc67ffa33a5b5a5a47f3a0a5568103d4e3de3efc7c2d837453dcdc077c7 SHA512 f65745bdb3c98f20c37c7bbe737ebd3b1107868fd56f1a9c42a4adfc14592e853cdd19217354070e5d18d31145be18c3b10681768d9f025b5846488937bd8a78
+DIST rust-1.79.0-powerpc64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 80be893561f5021b4e57843a5a6c9db7f97d9e31a0748c2ef1768fe0074f29401a39de781d1eadadfe760e8d7f9a286045c6bec2bee1b2a889ccfb9625ae8477 SHA512 843e1cdda3dbceb93cd0b345ef0f551946cc37dc5085f52cfcc3c9f6e31f8d4d6b176afdf1c255f5bd7283473b717963aa0e6bd905c2eb89f3543cf5e88dfff0
+DIST rust-1.79.0-powerpc64le-unknown-linux-gnu.tar.xz 192753084 BLAKE2B ba53cdb229484dca210de50bc7cd493fae04b4c664551fb5b7f7bd6bc7dc3bbb59b79d183f20a9dada393d586eb49956fda1a358bb5b5761fe8d65f7ab58b3a1 SHA512 d8db247ecfb154247d7243e8caaab0680bb81e11aa0ed3e627b6a0d96a21a0a2099a7bdcdacb57a8b84910d6716754843d80a9149a8ee02fdbb6bc411a352112
+DIST rust-1.79.0-powerpc64le-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 3e5ce77c7a2afdf0ddc4d8d53bf7ccaf8506986c1cf196837a3a6d82d648b4515b4c8cbeedb2998df233a1c5428ccfd82865482c0d0493248fb0631e100d4986 SHA512 5e63caeb8b20c7dde37099cdc0c246694b67dc2380104c83d3cbff7810cac521104d4d6cf6763559e13cc9e4bb5387bad761e79fc7bacf48536db1918b59246d
+DIST rust-1.79.0-riscv64gc-unknown-linux-gnu.tar.xz 195616336 BLAKE2B a17b0f9022681233e23ae3c3eaaf93da6d730ba604a9d327cd4a2553cd8c7321929e294de27866e995a591554db4f31f2b9f371747e4b45e473ac2c2a466ba63 SHA512 8a8c6be44ecf5d4cf35bdb32c2a56136fb007e9502f7f42980b5cec135bc481252b890be74d6ba638c2d885d1fb9bea58349e6ba67dbbb8efccdfe7bd6c7009d
+DIST rust-1.79.0-riscv64gc-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B a20afcbcc4814988594537e0ef1ded539c29987941044d2174c5f16b84286d3d8b29321bcd205f5081dcc8ed487d21f88396a0420a7fc3626748b8ad1e0ca2be SHA512 cee5e0ebd5e7fd00ddda6549f749603376284071db7f806175b1913b39a94a5540cf535f30d45afd06ae95ea42b0fc6b71517bede7f09dc0221d5516abf32450
+DIST rust-1.79.0-s390x-unknown-linux-gnu.tar.xz 208109368 BLAKE2B 8c110bff01f7a7456a6044a782198c74a793af0fe4acf6881fb9af4c8193cb6c513cbcc8113320fee027a6eb046a0ca4319d014379c6f670f915314448fb927a SHA512 07de1f7da8d8d23c63ed081cd56c96a9becbd4b7149f87636918bce8155a25ea95579ef8694adf6e455ba6cdc19776677f430713a6ef6c607a7efd26db4658a8
+DIST rust-1.79.0-s390x-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 28a2586c96e2ee2263cae8c2dcd21a0017d09969114cc905a37408717c412a162fed12023df801497906a6aa77b294121699a56d05e270b28e2831796a15f4e8 SHA512 64c85ecf772b73e2e6f2002053a8bf659d518e7be2a9d0056fe38e991e47304471372206a8e45250d6a143086b3b1f4fc68f4e19388c040735e8475c981fd8a0
+DIST rust-1.79.0-x86_64-unknown-linux-gnu.tar.xz 165014992 BLAKE2B abd9f73c8439f6f4f9ea1b586cb0b2d3ddf3351e42dd49e01e2267d1bc2f9dc27dbbe9b866d5a571a983e3c537f003ea9a6570258af64edc26cb86fdd8e64d86 SHA512 c027a015cc6544d288b51bad6ebf8a9afd40932a06972cf61bf64bfe4997dda7ecaa2d53c4f4fb2200bcf1a7df16c3a44ade1b8366a32ce9a4c85357cc76dd0c
+DIST rust-1.79.0-x86_64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 9cd1a51580d9f70f96c83b603716a5edbd8e1c4d4c2f53c07aa9d37c6c47f3bd252c0a1cf26b77bcd60842fb83ed74cd7b6e4ab3a039c3938423372485f8c1f4 SHA512 b65621f91085f4a5c6f84ed5e530fe56502ca12c5b18486afb1197156c5f6087110578647d428a58a1a6c04765569a28c38ae40a14c72fd41f39948349e8115d
+DIST rust-1.79.0-x86_64-unknown-linux-musl.tar.xz 247326760 BLAKE2B 36bf6787c69971ba7c445d1895001c005af0aeb48aaa3309e971237125a2b6de3ef5f1534572f8a3f4c1bc024962a8fd030e91b63c02f03444b5aec1a3ed2e5a SHA512 02e5c2a67f5470f3320b04e7c4f0a6f5dbd361d5a97aee7e5860d04224683166b21375794c94ae040a2cc6fc119380be9d3465b8c5e1798abd4142d621cf9f99
+DIST rust-1.79.0-x86_64-unknown-linux-musl.tar.xz.asc 801 BLAKE2B 6dde2d3096f7e47d31b1e13e7e5f41cf278e770dcb8a222d76ab5b93b2ca8a6d9e5b45515e097e5285bd2d76130546b3eb302a8391102460c4564e654c88f03c SHA512 4618852fdd81684ddf5bd8758d2551f1c800ef1614fed8ba91a9a1d29b3b51a0b9bf169c499dd8890347f999d002e5aba7b49a98eb819f20bdfe82fa375ed45a
 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
@@ -246,3 +274,5 @@ DIST rustc-1.78.0-src.tar.xz 159181212 BLAKE2B dedae58e413689de258f852c988a9a91d
 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
+DIST rustc-1.80.1-src.tar.xz 199234944 BLAKE2B 39891362f2a4bc249f5d943e3ded48d2add9cd9c0ee3c085d7fbefbfbc784f1e029308d9486cd35a6c03b77243077dc1196c75980faeea0d4319cee057509b6a SHA512 3c746108a86eeb734c1a8c8f63ba1a45e2cb03a8cb553395a167d07dc3ce5d8d9ea365ddd95533b6952d915069b86cad7ad218d27861e0889f8e878136bd32ab
+DIST rustc-1.80.1-src.tar.xz.asc 801 BLAKE2B 0fb361678e4b580c89ccc35fd1b29d24ab41af854e5a34d24192671c93140b7d2c91e740a51f1eaa6854d5970bb91a0510aac9cb6cbf2883e77a2b941d65b010 SHA512 9d5731db73b8a982b956cb2c4736c0fc7dedab785d9855508e6a1fc2d2163d561fdcd5b254ea5f7b1f27b3903d10d9d2403366e63f9c690ab722c401109a7c1d
diff --git a/dev-lang/rust/rust-1.80.1.ebuild b/dev-lang/rust/rust-1.80.1.ebuild
new file mode 100644
index 000000000000..86699c0da5db
--- /dev/null
+++ b/dev-lang/rust/rust-1.80.1.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}) )
+"
+S="${WORKDIR}/${MY_P}-src"
+
+# 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}/${PV}/lib/rustlib/*/lib*.rlib:lib.rmeta"
+
+# causes double bootstrap
+RESTRICT="test"
+
+VERIFY_SIG_OPENPGP_KEY_PATH=/usr/share/openpgp-keys/rust.asc
+
+PATCHES=(
+	"${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
+	"${FILESDIR}"/1.67.0-doc-wasm.patch
+	"${FILESDIR}"/1.79.0-revert-8c40426.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_ >> "${S}"/config.toml
+				crt-static = false
+				musl-root = "$($(tc-getCC) -print-sysroot)/usr"
+			_EOF_
+		fi
+	done
+	if use wasm; then
+		wasm_target="wasm32-unknown-unknown"
+		export CFLAGS_${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
+}