dev-lang/rust: Add 1.77.1

Signed-off-by: Randy Barlow <randy@electronsweatshop.com>
Signed-off-by: Sam James <sam@gentoo.org>

2 files changed, 816 insertions, 0 deletions

diff --git a/dev-lang/rust/Manifest b/dev-lang/rust/Manifest
index 1c90ff131a80..1d9c9d33d4a6 100644
--- a/dev-lang/rust/Manifest
+++ b/dev-lang/rust/Manifest
@@ -144,6 +144,34 @@ DIST rust-1.75.0-x86_64-unknown-linux-gnu.tar.xz 156249584 BLAKE2B e6ac90854f589
 DIST rust-1.75.0-x86_64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 6614cb3ef782c917e8f7fdc990c5b82e8fcffa71e075f10f9726f405ff566fd963bec64cde4dd7252d9d78e09a184b8ba22d15cc87662ad987cdd37c881d8288 SHA512 bfaeef4cd7643879991955fd33f4cdc4c34afb1202cb77c0736434fb735bd215d18d1a11c25f04a7f2514640858a36832e5805a5f85e92d8b7076aa18607ffc3
 DIST rust-1.75.0-x86_64-unknown-linux-musl.tar.xz 234151836 BLAKE2B 9461afbdf26dea19e118b35ea7ef1ee60c22f601501ae6a08950658598a74a6b3179cbdfd9dc4748a0c2485af721b371e5fb523f27e7d7d702f94b532a70437f SHA512 7d650a29c5d14023a3d7d606b7bac4be6ef7988a82525f02d7af9cf3895bb88284442b8042d27be69689f4bddaa5c5370ef7609d18849986860eafcdf89d2d69
 DIST rust-1.75.0-x86_64-unknown-linux-musl.tar.xz.asc 801 BLAKE2B c222d0989518602c0ecde9d21dbca97e9e60d81083804d1d8b2c6bffc8114af78570fd384eb58e5dba1bf249b99300e7f3f4067c1a66c0cd9fac60443f56f751 SHA512 6f78913e34402cedb37f4a54491c65a8bfe79e535e4e40516f2381bc27783cc7655e9252e7701813578c8ffcaf6b301e61ad32917a475d4388fa472733b21b12
+DIST rust-1.76.0-aarch64-unknown-linux-gnu.tar.xz 217392212 BLAKE2B aa587d69b5acc389a8d1431875f10f6261bbedb259a9009092e663a345fb0ac0cf3ad3459ca549a496853b8d760c7fc56b797ee269bcd15d54bc735cd1100fbf SHA512 ad95566ca7597ef64a03f614cc20b9c8d9b2fe67f33141b817973fa160c2be978511509fee79bdbfc74c50076a607e8543ad5bb4b56723704df27b5573b8d606
+DIST rust-1.76.0-aarch64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 86834b999cb0ad9de02a32a79f801d28268c986c830ad3f16274cd4c404a4305267c90b677f7a8637f2de08c766ad3555945f77da181906358e3d51b35e258b1 SHA512 79c1b258267d6feaecba18648a7eb620a570c99fb75e422d0a5b946a66f3a5bf6d2b41dca89b4ae79feed704d498674f36de368e4b228b1e38e3499ac8cd4f21
+DIST rust-1.76.0-aarch64-unknown-linux-musl.tar.xz 197852572 BLAKE2B 93985909e049957f80d4a14842c85dd14e5eec6d74e4e439479f353b44b123947c782856de86555262829d755a344ad01a94c41e8852818e727fba74620e1d68 SHA512 1f36245932d3b9bab0b99604085d886d9fd2e575e896e1c28b1771ae916466c060f4d70486e47200d58947147eb5571b922e175b1a450a36388c3c95e6537655
+DIST rust-1.76.0-aarch64-unknown-linux-musl.tar.xz.asc 801 BLAKE2B 50326fb881308300aa01f3783ec6856b7ab9ef80e986cc4e64fc5d6d0bcd246add9330ee5459a3ab5c0bd417d75c2b9486bdbdc19edf5a899dfd9e1ecf31028e SHA512 0e775d73bee5cfc70035db1d0fc4506d022d593cf847e01c3f09ddc48a02c4eb24eabd42391c3241cc05ca49b15e38eea0f56786a4f800df724753ee7c557ab4
+DIST rust-1.76.0-arm-unknown-linux-gnueabi.tar.xz 181085440 BLAKE2B 024b82d285208635dda1c6dd66f634d1b921657d3921c402b7adeb7ac9b495628c31b248ed480d4e52e55293815a686f9ee52a84c2407763de5b961962ca9cc4 SHA512 c6840b3368bed511976c32dd3b22a8d1341c002843958a8cc8666c4f19547eb71d8a90946c1c075cf8af50187c1f14fcad2df488d186941d00cfd6b638b27dde
+DIST rust-1.76.0-arm-unknown-linux-gnueabi.tar.xz.asc 801 BLAKE2B 71f2d3a9de1343eb96a75a7eec3d8d4ca9a02e7ed01a1cd2f4f352855dc6d58cae5ffbd70944d7d1e0c7559c74f8d8a25f3c1c3a14c2f00e5797d0f142b25a12 SHA512 b3dcd4b3e2fb5e5039b7fe654421f7a2f72ec5ebfa841589be715bf0a8ff4ff0a3c46a25d0978b4206678a2f2410c5ca69146f6e3eaa4b02a6231589bb099ed7
+DIST rust-1.76.0-arm-unknown-linux-gnueabihf.tar.xz 181168340 BLAKE2B 8d48ed7c79f87aeb91676c3f90877fbd396341130276e27adf42a0a0e5d3f7ded34a271cca34f1c0fa7f37d5666ba3f2f16eeccd91aa37859adc34077dd2a000 SHA512 6beba28be79a563eab4567ca33dbcaa7cba5f4389fa480ef4e16e528fcdc1ed6a2c7ccce1ee527afbaaa43545bfd80fa47ccd3ca2ea4c38ca2b397bdbee47a3a
+DIST rust-1.76.0-arm-unknown-linux-gnueabihf.tar.xz.asc 801 BLAKE2B 534e5f05848e5f6c05f2de69e0c974f5e4860c9ab4501491a651f5d2200aff69c9ece29010aa732d0eac3173b1f148afc3096b5f05146f7be7df14e5d9ecc44f SHA512 fba15a41ffc9202ae27a6c2884bac7367219fc5b1892287a599a1c8d2251bbe763df07da4b9719d73bb6d93fbac3dd1b8c4d8af75acb942200c9d7b1050be009
+DIST rust-1.76.0-armv7-unknown-linux-gnueabihf.tar.xz 184387332 BLAKE2B 7b9b03332f19859d43629d4e65815619fab1845c129a254643f164c025c5d574e71f6001899deec470e93c97fa6ac8c9d71cde5320b6f4cd822c2ab113e4b827 SHA512 3fbb7300e4dbe855207671ad309b71cdbad9cdc41b1c8144734f9de85c904918b137a2fe7284e9046f00526c7fce8b68dcbb40ab8d6543ef31ca0bbbfb396431
+DIST rust-1.76.0-armv7-unknown-linux-gnueabihf.tar.xz.asc 801 BLAKE2B 050c4eead78d8161d46acd4ae47b69612706d8053bdfb5e4cfc0fe20ccbf4544643c1850f14cf93f7d17602849770857551b64c7f8f8db45594b7dbe267ecb41 SHA512 32e72430c4c9a5970994bcc6034d3be1a2a915adc6aa45a0c1cba403f6c44206af3e024afc42fe39a8501322fe46deea9921c9760f8e1f65422960baa88abafb
+DIST rust-1.76.0-i686-unknown-linux-gnu.tar.xz 211679020 BLAKE2B 06c9e52a1b6c802be3c4b0cb424dcf243f08fd5345e4b3977cca82093839cec885f6f491179e9e1f8e64c971bd7bfdbb6c551e463874b44c8b89ea649e8c9f40 SHA512 64605e0c981df2c805ba8cb31a89fabd00332faeea6d04ac57cb4898b7cedc66e4043ca3eeca799a204ffb93ecfa770150f09b99da3a7dc913d4e97331554e8f
+DIST rust-1.76.0-i686-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 72d87215c5ddf03ed0cab99adb97b6f15fa8048fca68b44bdb77cd0df09cb1784cecb80f6618ad43d1b6f41a5848ddc84126ad576ff1ff08a3928cec9811a4d2 SHA512 a6d52e452a7afabb329b75155db9da91d51f809e913b19cde1c51c4d0f79831e962e698cf8e86079649e31a662d13743da23b13d16df6530427eec3e4269be7a
+DIST rust-1.76.0-loongarch64-unknown-linux-gnu.tar.xz 162940496 BLAKE2B 4c3b66199339262ea93de6785980795e493ce4e7de9d7ddf3e7c9fe38ad404f980abf408e979780905c149bb3de65d26cdc654f8b3ad0823a3d5067809fc4944 SHA512 64fac030d7edf9677757b883d1664b7e06ab9d5007d87a78d449acac359d7d6ba694bf4a6635c8bca51f274f842dad0612377aef655bb430f6290459343aa6e2
+DIST rust-1.76.0-loongarch64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B f52e951657308df5a944d35e2f9c19278f6f250474c070593f3b2072f372b8f6c32d379d144c8ae5a3ee31f7de21c00ec1da097f2c8c9a54759d9440ec5eb822 SHA512 d5ed37fd844715daa5d9901b388cbf39854fce3408c1d572f18e83d6207a20345e5e2c2b49b9c1523097245c73e1a448df8ecef2ae5b344e57bbe646b1266af6
+DIST rust-1.76.0-powerpc-unknown-linux-gnu.tar.xz 176795548 BLAKE2B 77e102e4d3821557895f3e24059b65847dc46ce3b81ce73f15063e9a6d383ba12f4c905fcbc85b79c39f00e9cb011fd2831737bb3ee9bb53103b4a7361aa312b SHA512 05ccb4294d788e948b69c9e38abf28454604f6b5bdd04704d6dd5231445e2f791cb18ea5149b4324a152ce9ae356b55036d2f74a5d9dc3aaaa05f5c7e4e69e1f
+DIST rust-1.76.0-powerpc-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 6d2fe65e5840cd7ddbf1b18ef89cd337b16e3424b6e20d21e199b274fbbc4d9fd88406c2a119d5b0bd48fc9e47145dade3f37bbf99faff68905e57bd41937c1a SHA512 a1e45e41f901513e97956d336910927d7357cb8c2362be69989528fa5ae7087da409853adfd86354b4b7faec3e8542e400838df1d195843c030d9c6fffed7557
+DIST rust-1.76.0-powerpc64-unknown-linux-gnu.tar.xz 177409476 BLAKE2B 7c9829c8e8ecf2a162663a2c382bff49739ca2bb02b785ffdbcf632edf55a3ea37ea3be09298b0a0a984512aef290123d3b0ca9ae0d088a2a816f38778aec79b SHA512 1f29f66d8e64d4c191bc90b05d791f08317aeec042ced815fd353beef6a7a4f6d5f91755481114e707728bd9a02ed9094b2a75d91d61ddb12748d9d40b211e17
+DIST rust-1.76.0-powerpc64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 3087eda9eec862455906510d38f43b81644243ff7afbd5ddf221cfb2c12408b8ac9a0bd2a269a9499776e04b56b3d52c890e056af544aa56cc06b399614f83b5 SHA512 8a90d5acea677a02b2c5eec93157ee2c47bab895e16408123a0e2c3d44b0f9a9d95fe56dfa903fa1cd2fd298f17050110793e94d60510283c8e3cc120770ce9d
+DIST rust-1.76.0-powerpc64le-unknown-linux-gnu.tar.xz 187967776 BLAKE2B 0ffbbb4e4ca44285d8387fa66c58df72971bba6410faa96f6cfd80c223f4996285fac27672104f25ae2a20cb81a0ec6be0bea1d6893d95eab0d017fbae896509 SHA512 eb8be647651b02f1e9287d075d76c288e34e66514305a68ac118ef41dc14a16e5e1a3f2c5cb8512c4565a2eef3e5063dc4eb11272fa91c01d8313a323c20755c
+DIST rust-1.76.0-powerpc64le-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 5f41ec8841f4004df7b65b50a451027489e303bb2863ece09a14900a229d3180ba23bbf5c770c2939399eb157e97b4a08ccc0632a66eca5ca5cf4c29a1523186 SHA512 929e415a66d8777e2509c25a780b4963b8991adb905a9841dca19a5412a5f86326fd73c43f79c304a48a2898f863b76024b0144109343933a0c5f3f1fb8ed287
+DIST rust-1.76.0-riscv64gc-unknown-linux-gnu.tar.xz 183161264 BLAKE2B 9a0b579bc076b8cc55414c95456caa2146fd0597091d2332c1033d03ac7495684b7b7989ec6a8a108953c681ed88d4b62a9a7fbb39c0300128189a91b035d2df SHA512 29fe21df7b99b9a9483af6f2370e2b5a403c12aee94a1285bfb2d2efa631f9d284c70caf863247843ab1418bc78a26c6f6d5de4e8606456a9ebd265ea3bb504f
+DIST rust-1.76.0-riscv64gc-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 7a380f9d2f2f7083afe7abcd81a15d34df703f076c2c842fee2433c6c40d629bc5b0818fc186b462d653aafeb1fe767de3c01b7a014ec3220d77725bf1074fed SHA512 53e4942d74f42f4a7c35ef4a33833d23a955af157d80588c277f32f30cae63e8543fd4ffb569693ad00a6a20ebdb2d8422ca078ebc85bbf98814815e32791894
+DIST rust-1.76.0-s390x-unknown-linux-gnu.tar.xz 202133724 BLAKE2B d6d68392b9b9b69914cb6986cc1501246e0461a6eb5d18eb0ffe71e0a2a7be20d27e90b117c520723254b4709d08c4fb33d145e5ab559802ba6592dfabf81317 SHA512 fa74e1605eea945445f8ea621a667d50907d8b3ceed700e6b05dbcbf58dc7fec62c1e50247ad9688a5b9c5b78c4a140d93557d494260f8a21b1eb25baa315bec
+DIST rust-1.76.0-s390x-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 574df1144e6e79710a73962511fc73215b3a4d1c3b6623190180c7ec13aa8295e13329c4bc66710013f874054dd756e02bfb2c5f6ce1fc8a07ae0717f958b244 SHA512 17938b3f4671127c9c46a5c51703d430938b73b2e30cd497cbc159ed372889af42e651479d1ca69c000974e21d4d34cfb9e3cf28b79ec8e35540ac319e1b8b9d
+DIST rust-1.76.0-x86_64-unknown-linux-gnu.tar.xz 159385660 BLAKE2B 0846999358aba95a2bebd2ff35ccc9e1954ff4fca66227d1c8c1985c08e91159f2acaa1357544b81e92065a2f9ddf6aee41a2d9199d71d8de1655f9b16ba2ed3 SHA512 1cf0ffb44aee4da9768e27daf5ab3b20e67fc9e8eba5a1718b700c85ecdb61cdef129cb571633294f9c826b6e7bd2958086eec371922ca31af332266d3632609
+DIST rust-1.76.0-x86_64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 88e6b124812b409372ee05e2872cb4dfacbc638f8e3b4fb0d5fa4ea63f4594333a9788732502f8bd41e34b5cbc404d7ac08e7690d095a6c37c80b0043dd2be88 SHA512 f7ddca81da468d5617f48240b6d3e8d7d09336ac58f515acd3a20f2d315468ba1d53508dd3264a088ffc0141cb3fbcd8d3c17379f9628270d39c7d44f7727291
+DIST rust-1.76.0-x86_64-unknown-linux-musl.tar.xz 237333892 BLAKE2B e95b92c68e3c2df49fa0d5d84e35f6575fb80571db290b5969441cc09b6c07dee6b2b887f41a2b1ff1e3c099cda2ce2a4a8c05afbcf9f4dc8acbaed5245b69e4 SHA512 04bbbb9a6891c3bb7a20845010029e6ca979548ff70324c08d3162ebc1fa3a84e8c7e2d453495edd34aba19b7a685f048d5047993103bbf221c88ea36350370c
+DIST rust-1.76.0-x86_64-unknown-linux-musl.tar.xz.asc 801 BLAKE2B cd4334fecc17cf03b7333659393004fed4bb895f9b75f93520d1c3e3ee0ce4fcd17d75d748c4a35d31984215c7aec8904ebe3a4ad8bafcd625aef30688a473f7 SHA512 a458372b41c2833bdbd3d6678c35fc23397817b406c409d1ba5e19b4c6246072afff3f938f111382de56f7ff57e660c3eaf3fea0e54871d9af50b52a54f39e41
 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
@@ -156,3 +184,5 @@ DIST rustc-1.75.0-src.tar.xz 159624388 BLAKE2B 8937b80585eddaa3e1f1ef948899d14a1
 DIST rustc-1.75.0-src.tar.xz.asc 801 BLAKE2B 434da96b1dc93a5aeed07f4961b087fdd15870e407283ecc00df08dbc1e9f6c65fe459b3a25d39ee55900d53ee583207098ecf3d63f5d6ea114ef0b8398b6a63 SHA512 a0e948553af77ca6e2daa82c69d79079ef7d4ec61957bdff99efd73748200d6c7caa9282daeb3fe3ef849d81a48e66a25336df4c7b6f62f975266aa8b9b93d3a
 DIST rustc-1.76.0-src.tar.xz 162267908 BLAKE2B 0cf726841a837d9906d82a6216e65edad1e3e4a798ccd1ca3824c2098d0c45473854b8bf183c6e9ca70ba095752e77c4f5ef575d98c07243d609857214175f5e SHA512 92e16cfdeb91bde341fe6c2774d92868275b07aa1d46d870ddc9291eadfe4ea9af93e06586fa7d6b8d60534903945cbbe706d354c90272712989c58d2bf174bf
 DIST rustc-1.76.0-src.tar.xz.asc 801 BLAKE2B eadb2f54fceb9c1ac60af72407a2957e37e1ba134a696675a1e9dcf23a2958b41d7f5aa1f75156e4843cefc387cdc9c909e364c3bfcabecc6bfbe262d9c6e8af SHA512 d35c010a5a129580746bcec5c0dad1b0bc1b7864a69505c7c0ccfad436fdfbdf33f87518965a09de187d6a70fb8867dc6a20037c648861031a17501577855120
+DIST rustc-1.77.1-src.tar.xz 162796048 BLAKE2B 18a9fd095808ba78bf50ec94f7fd4087a1033ec79750aa593bacf64219c77ef90c030d41a7d8bc43f7ec8eb30b316c225024be4aeb517100ff6723487f8bb282 SHA512 e057ae638e4c3e54fdb367d48f4b85458121cee0d0ee1ed72f346940b8acad2f16cd9cc8abc16fcf4a17bf244b3300bb56a7e7be3bd0c23b034692c983b84fe8
+DIST rustc-1.77.1-src.tar.xz.asc 801 BLAKE2B 175a551abdb970295d37a0797cf262ac43055a3cb75b23845dbb8696d04b7705b7a2908b82fcbce7cd7dec2e05c382d06622013b9d4aa19fab7f651f7e00bb73 SHA512 eb24976ae97d2980d4c547bcf27d815f4b98b8aa45441a7201a849ee37e0ef15671732c9916d33964b8e802a87ede758daaadf84901bd569527c8b6c48efff23
diff --git a/dev-lang/rust/rust-1.77.1.ebuild b/dev-lang/rust/rust-1.77.1.ebuild
new file mode 100644
index 000000000000..d77fb9fbed48
--- /dev/null
+++ b/dev-lang/rust/rust-1.77.1.ebuild
@@ -0,0 +1,786 @@
+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{10..12} )
+
+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 ${ALL_LLVM_TARGETS[*]}"
+
+# Please keep the LLVM dependency block separate. Since LLVM is slotted,
+# we need to *really* make sure we're not pulling more than one slot
+# simultaneously.
+
+# How to use it:
+# List all the working slots in LLVM_VALID_SLOTS, newest first.
+LLVM_VALID_SLOTS=( 17 )
+LLVM_MAX_SLOT="${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}"/1.75.0-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
+	"${FILESDIR}"/1.70.0-ignore-broken-and-non-applicable-tests.patch
+	"${FILESDIR}"/1.67.0-doc-wasm.patch
+	"${FILESDIR}"/1.76.0-loong-code-model.patch  # remove for >=1.78.0
+)
+
+S="${WORKDIR}/${MY_P}-src"
+
+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
+		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)
+		$(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_ >> "${S}"/config.toml
+				crt-static = false
+			_EOF_
+		fi
+	done
+	if use wasm; then
+		cat <<- _EOF_ >> "${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
+		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
+}