dev-lang/rust: add 1.78.0

Signed-off-by: orbea <orbea@riseup.net>

4 files changed, 878 insertions, 0 deletions

diff --git a/dev-lang/rust/Manifest b/dev-lang/rust/Manifest
index 1d9c9d3..914386d 100644
--- a/dev-lang/rust/Manifest
+++ b/dev-lang/rust/Manifest
@@ -172,6 +172,34 @@ DIST rust-1.76.0-x86_64-unknown-linux-gnu.tar.xz 159385660 BLAKE2B 0846999358aba
 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 rust-1.77.0-aarch64-unknown-linux-gnu.tar.xz 214505028 BLAKE2B 125cad238e23c31373bfa7f02bd09eb35c3fb9425f517d1c74eb34b667fa1cf8a0e36b879ee1ab90c5ab95a8ea499f0a46ece894dc45cdcecc52831c9720b860 SHA512 aa01ef526b8ddc84fc5fd1ef747d94c0a80250606fc9c871a52a6556989b86231ea0706139480b7579f4f817dd17171ad18edd6a6a73c5640aa5a20daec8c9ee
+DIST rust-1.77.0-aarch64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B f6af9150b43c206e626b9bbb6d31a18b8d04b99f24ff131668045cfcd80a616302954e74f41397dd5772c761a7f8ce1a14c15f1da509d13d64ffde2684f9c3dd SHA512 cfa3d76d441ced70c9991aadfe144c12d56e6bc908882b84965ce1f13373c73199569b87609fd362a09484a95936151e036088def72061b78ea3c13ab36178fb
+DIST rust-1.77.0-aarch64-unknown-linux-musl.tar.xz 194482084 BLAKE2B b079e5c09c1c528b35451918ed03ec3788d0a8f5de099c3fe3aeaa815dd0a26e3106a2dc0c55462f752949e8ee50913e1cd1bf97235459ae5175847babd27d30 SHA512 6e3fe34512279138b15547e09fac8ccab49fc9a6e5c8faa010067c601aad284522dda67dcd5901bb153fbfa4b06e819be36e9a06b1061c702418b39f8f351fd2
+DIST rust-1.77.0-aarch64-unknown-linux-musl.tar.xz.asc 801 BLAKE2B c4a523203247096500797238f7473b36c39017aaf1c231713cd2d87379f973a7a464e864952b8dc1575ad91ffc210ff2291f88b77db24ca3e5f18ecebdfc23da SHA512 6fc6655a4da63ebe56af5e34569ae74f3c7daec550249269d4499a7f6d116f01e722f29ac95cbd8c0df60c0135db03ae50436650e8c04ef2ea685344e1ad61e2
+DIST rust-1.77.0-arm-unknown-linux-gnueabi.tar.xz 179351340 BLAKE2B 51571532f1a5a70139acc91d17f6aa06537e32c60aedf5448ae73efbc5b028c54b098ba1c1820bd21ebc4b7fc8bfd35b786610074b7e8e86f2b4a561613c16fc SHA512 cd8de4f9f42d5c210334f7c1e110a9abd571ff6cee39d08582cffb89828fdb4d05cd83cb597f89b5fe2ef56571cae7c087cf5751f0a9ea4836b157e076537b5d
+DIST rust-1.77.0-arm-unknown-linux-gnueabi.tar.xz.asc 801 BLAKE2B dec3c7d773b61eca698a8efa9138bbd58341b48e391b5898ead2f6739a3e9088820ce8749b0a7016fc2092a7aad3db7bfbd778ee5b56847b6f98a9bf7251af9d SHA512 0a2b1a6eeac880dc3ded3ac28c31413b857bbd0bc68f87d7bb26936b00827d45a72d96d35ed69c6c981f4b9c2ea2d31aef9c82bedb0ab557176246f327f162a5
+DIST rust-1.77.0-arm-unknown-linux-gnueabihf.tar.xz 179479060 BLAKE2B e3a6b29b916a39233e8ae4f6b190479adc19184776f3961373e54d14cd2732ce3561cb08061520c6161c62222b7d2be2027fd826722aef4b128e26c00165ab20 SHA512 695553505af721af3d6d6341230906a707301c41d491118ff3e1c64a9f7e648c6480f8b9c0e786ce3266f2ece266e0805681bc2c23c7bb12ed2a7347b384cba2
+DIST rust-1.77.0-arm-unknown-linux-gnueabihf.tar.xz.asc 801 BLAKE2B 6f456f02b2af2b972dda67a5be9af53576878fe6e434d3385cabb6f6a62728682ed6fa5493dbb8629a861b25b8f722efaaeaeaad5ee20dee55a2567ac6003406 SHA512 a9f97671077b24043aa21b242112e86036ac8acedc719d0e87860a909d734d109db138e5bb7dd8ed2735662bf63ef2310bb8277b280bfa918dbf6c0bf69ee3a1
+DIST rust-1.77.0-armv7-unknown-linux-gnueabihf.tar.xz 181508844 BLAKE2B 78305dd8cb11538c3c5de3883dbae2a7fc08470f940f786fb4e8b5125f57ea119d19cfb11fa55b6ff67fe3c5a03757c10cee6baeae229bbbbcd85f265ebcac85 SHA512 42ac807befa5a56244e892eced3e6771f9bf2cb4cf5df28dc00581916bf655840bf4685c1499fb0a9fbeb40160836f8ec2959526d32b872845f72ce48de93a5f
+DIST rust-1.77.0-armv7-unknown-linux-gnueabihf.tar.xz.asc 801 BLAKE2B 39a3ff2c0b7088ccb7c16c87f3abed37cb9d4ca8f48c77f6c2964b28d7a1eec4df09ae5f19fa6a2abd636436f3886b7097edf90d2f7cbf0ba0fa93a2dcf37a28 SHA512 83bde08a5b5f34afec0e4b0ad6c58e7d485a0729743a67e0ca09cf475cae194b549c05e1af0667dcaeb8a6e3807e2b20ffe8e7bf7272187ab9da0093278d61be
+DIST rust-1.77.0-i686-unknown-linux-gnu.tar.xz 209041428 BLAKE2B 83c5329fdb91f14d0083115209359aa1fba0425e9746cd07f76bf820d7b13c339279f39f0c05d1d2e2049c9acad9a48b4d93c97fb26593bf66d95e9434d1a6fa SHA512 8b546847afcc0860e3617df5006633d7c12adfc7f985ad5c0c2b5a83b9f47e9ad3b0c1917a66d313a4bf370d37e959129a807e957f4cda95efe2ce03d5acefbc
+DIST rust-1.77.0-i686-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B f7955963b450f3db22d62bf9cebec16ee2eb2ea32f13b377b240b7d7bdd54da590bbd5d69ae1df02b3dc4f35a35724d41004cc2b23e5f0001b609f086e8028a3 SHA512 927de4072f4d5c461131b1b4f5a1573d96d4da1a2b23060bf375bd5da00fb962e9eab6094f3677f9f8bb7270b54c30a0c5404fc18b2641407b34740583a7402e
+DIST rust-1.77.0-loongarch64-unknown-linux-gnu.tar.xz 161969048 BLAKE2B 0eef0100389715b68def1a491918d0796cc4bb18a481bc8084a96ffb930f7018cea8fdd77e762fd1af18acd81f5fd666f48965e9b72f191588a0c4ed78c975d6 SHA512 8be1eba5615b29d9167e1ad49be301e277f2fc78c6779915dd25b3da395d3933f4ea2c0b4e17d848f580c813c26335285d20ca0c2f966d2248593f04bd8ef1ee
+DIST rust-1.77.0-loongarch64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B e1463e570c719881b2394b5f92856cbeec33a5fd0dd326c97f6064b52ed1decc0b7d33ac3b3606754264faa67b6aeb718c1d3f8f7982ab6024acceecb9d0985e SHA512 03cc2bfdeec9c80128f7e7a5d5f0874df7eb9a22b5da19f9ca1a685a9c52830de5093b7b72c614839da14b7eb76ad3dbed92c233d6d9cf0dbccb458e1fed174a
+DIST rust-1.77.0-powerpc-unknown-linux-gnu.tar.xz 176187556 BLAKE2B acdb1d1f95591dfb167bd87a2b7390554f96d148f6df01c7a1254d590f79302a233e1561446bb8a7f344e6801506c183221bad431fe40b6e8e1854b920641b41 SHA512 baf226c192c5a6ee44d5c7e32f0d63d48b89fa43db1c9966d04d94bfb7a4bba3dc069719109a9c3cf601f6ef7b3d2c320e75cfded5916f6169f4c19a16665301
+DIST rust-1.77.0-powerpc-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B e8053f9b897dbdba5b175c56ad9cb9c278e968c65cde4f8ccc4d15f1df9f26a2be3418040cc5a6cfd6984ce9b0b3703b98976944eb6523ba45a0fd45e6fc31c8 SHA512 d0a8b2e18e59e55819d64f5622a7fc7a15ebfe05d0946f23ee42dd6c75307e9c2f20541c5b344a3bd97e9e9d93b54d6a85ffd7c783492b9c46f819f91c68af61
+DIST rust-1.77.0-powerpc64-unknown-linux-gnu.tar.xz 176156772 BLAKE2B b5910f75e945f5ecebb988ef02485e3535e3f8d10f6c7acf3190c6dfe22e0125a637c8c4dcae3b6655ba0ec19f1ffa2f8ccca67d9fa3b2a8a8dc584e52d2eaac SHA512 403f1898930367a59a54c1a254cb991aa23e3bfccf9ed3da9c992877bab3b33806e374dd97cbf9650109dcecdb6b72e5f4c7fa664bf44d5880f8c75d3698f27d
+DIST rust-1.77.0-powerpc64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 3d96ad842e8e4189c2cceebe885ccdf3aaf986a3e7835cc02165a76d12fa2da1b3cba9bbf1213cd7cc68a95cc612b735e409d8cf23dd1f252c1d0ab72a09d756 SHA512 26b73b5ac0216b994ee887021dcd6c5562aadeddce8b227a064ae40a19bb80de7d1278c9192833e2d2ff227884524f742c49b52ad5b64e576d3f87d86f7be536
+DIST rust-1.77.0-powerpc64le-unknown-linux-gnu.tar.xz 187190912 BLAKE2B b203cf8e70a952e137f17d4dfd77bfa201970fa6a9d936b62cadaf4db1fcaa3e51f6a320351ca0bccd96bf6bd5e38f5f859080e7154f23bb277dde21969f562e SHA512 5a68cba4de547e7060d7be6260f450a328c0505be35f175f65435c83c13520b10b6d5e6aed3c52ae8b61215a4ba47cdc1bf9ceb2f454f3415d5115efbdc05bbc
+DIST rust-1.77.0-powerpc64le-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 7ddd306273a444bb238ef3f7eb9dc88c0f2895bce506e7708c56d31c252c91a20258d6d7fd609c76054872f1e983454d35b985b5dac6775a8e423d9fc5c3d3d4 SHA512 3c4df1c5bf1dbcbf127bb3615e307faabf252c40655bde6ec3afe3179e44629155fb3b549bf983ffc942c464462a601c08f66d6bfc93b033c61d3b69005005b4
+DIST rust-1.77.0-riscv64gc-unknown-linux-gnu.tar.xz 182245920 BLAKE2B 7365f2de5a6e5927536f8b03b2f9b1cd9605e515e4323b279f35ff9c940d23d4f7539abd1f9da25086b85e695e111440d0d1990ce933080385c750d61307bd7b SHA512 39a9d98cbbb1c0247e80a6ed3635833f0ae95e24f7e62286b7c76b2f8f4a06715e324872a67693c97eba7715f868db8af3652e809112c9621c30a1885dd1a029
+DIST rust-1.77.0-riscv64gc-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 08128f5df77ea42af1d48a40884e1c7f8f50b8cc16354b9b099694a017d243068c9cfb9a0e096b5147b58eb5e2f9283d0e2be4c607c75f8b110e2cf84eda74d6 SHA512 430fb9105a4bc16edc0b9c4a59d124e2891935f7970efa823461d86945bf163ecb043f72fa11453415642672162978ed4446beb71dad041c9ca48a9ae0440aa1
+DIST rust-1.77.0-s390x-unknown-linux-gnu.tar.xz 198606604 BLAKE2B c102856588697aa08f9c0e3095ef9d0e17df0931a3416ca7b0a0ef4a6182d1ce6367040f8ac19b19f1d0cee6c70b64cf6f653c44684fa137acf5d606db82f23b SHA512 0ba59b16309393945a73615ecf5d10d31d082ea3e21357267fce08c9ddcb64c0ba0da7595747577d400d6549df51d95798ecac43931ebc75f9d57d3107fca11b
+DIST rust-1.77.0-s390x-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 2574c4757e0b63c5cfe35a58ab2aa175f024de79abcf36e623ee7b925a528decb7f22df89d16ba20cbc1218a056c1c37b154b33d2dad223604cbd3222017919c SHA512 baabe009b58993fe5f62940c51c0811e9309d5a7f9d33819906241ec38ece45a3420a2ab80d972cb2cb184e965154e50feee85ff4719c3d10851fbc040f6f9a8
+DIST rust-1.77.0-x86_64-unknown-linux-gnu.tar.xz 158351120 BLAKE2B 454e8667ea8899cb915680c0c39e5f7831450604a11a3bc9b7d8a897ef6e723edd382c171f292b5e89a406c823735d86ce96d94d08fda53336f806f83b3fad79 SHA512 462df108a811aa628ebf20cd3ad88dcfedbbe4529929abf86e65cbf02d4157ec56c8b9c424b9b9f6930852ccc972fd9970ceea522eeceb79c6acf5cfb7cf08f5
+DIST rust-1.77.0-x86_64-unknown-linux-gnu.tar.xz.asc 801 BLAKE2B 627ab5e55ae8095b2dfd1559c798376a5e6efe751f3c7e74540c9dc1ad8d889fe6c4c2190914506829e50f2fd7de022584b9d3bc3c2aab4e8bf3126dc4306c31 SHA512 24ee5edfb675f7598366edd9390d7a6044830c31ba7c9bc729e987a5c9bbc8cc7a6beddaef7cc9b1718d0ef4dc5f6568e0ca1504a23d82328536dd478dc391e6
+DIST rust-1.77.0-x86_64-unknown-linux-musl.tar.xz 235071684 BLAKE2B 556a5c8aff20b1314dfc6c767adc9b4ac1a70a5976b49e4550247082eadb76622dfdab253ec853d38807990d7c9f46503060675187a589da91ae2f093d5be4c5 SHA512 073c8b4c92f3d6444ea4fd599281c262fdac7fd4589aee0a0f0ec8bae2e6a315578b2fb3ac768579946cf4bfd77b0e440bceb0d3523598cbda7fdb2ac59c98e1
+DIST rust-1.77.0-x86_64-unknown-linux-musl.tar.xz.asc 801 BLAKE2B e049d7c7d25af1074420117b8a984ff585c85808e17b60285b4ae288216dc2ff3f6b08707157b5e9a7778abc312525e755b70fe38f1b0a23fbaeaa9a52305be4 SHA512 c9b54e5ee181dd217b36e258cc0e72c9acd17ccd4f99430ac4a473e898cb3a3cc16f79609e7233649bd8126119da1e2a99f6b7cbf8864dbae5b02746468ace06
 DIST 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
@@ -186,3 +214,5 @@ DIST rustc-1.76.0-src.tar.xz 162267908 BLAKE2B 0cf726841a837d9906d82a6216e65edad
 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
+DIST rustc-1.78.0-src.tar.xz 159181212 BLAKE2B dedae58e413689de258f852c988a9a91d4cf14c9525f2619ca6155006ddc9b2262c8141ff995e4fc6ecceec383470e50d2fa0952d933db9b3957ce5c5b96f62e SHA512 d2fb9881e28849d871fda71b1b51652be3839b3283f0d32163f258c5c707a9fb7b589da8dc03bca2fefee1abdd2b44a5f17e85d8c6df7bea119d1e8d22371941
+DIST rustc-1.78.0-src.tar.xz.asc 801 BLAKE2B a40b0eab4e9263694e79f21d92652402579f4a0587fa48b4043211bc645d4303f9af7629e9c8361938748163e99fa7cd04108156780f23f9c8600361785e834b SHA512 ef16c9eed79f36576517e9dd77b56aa767ae9dc745f5df1839e24b76084ac791b27926f3d608b41695ae6022aa10cbdd3650cad163f35037c60d3bd0427b3cbd
diff --git a/dev-lang/rust/files/1.78.0-ignore-broken-and-non-applicable-tests.patch b/dev-lang/rust/files/1.78.0-ignore-broken-and-non-applicable-tests.patch
new file mode 100644
index 0000000..610e5d0
--- /dev/null
+++ b/dev-lang/rust/files/1.78.0-ignore-broken-and-non-applicable-tests.patch
@@ -0,0 +1,30 @@
+From 1879d1d1a284bf51c752e47db284ce22701ed5d0 Mon Sep 17 00:00:00 2001
+From: Samuel Holland <samuel@sholland.org>
+Date: Sun, 16 Sep 2018 16:38:48 +0000
+Subject: [PATCH 12/15] Ignore broken and non-applicable tests
+
+c-link-to-rust-va-list-fn: unstable feature, broken on aarch64, #56475
+env-funky-keys: can't handle LD_PRELOAD (e.g. sandbox)
+long-linker-command-lines: takes >10 minutes to run (but still passes)
+simd-intrinsic-generic-bitmask.rs: broken on BE, #59356
+sparc-struct-abi: no sparc target
+sysroot-crates-are-unstable: can't run rustc without RPATH
+---
+ test/ui/env-funky-keys.rs                                   | 1 +
+ 6 files changed, 10 insertions(+)
+
+diff --git a/tests/ui/env-funky-keys.rs b/tests/ui/env-funky-keys.rs
+index c5c824ac58d..f3fe047a79c 100644
+--- a/tests/ui/env-funky-keys.rs
++++ b/tests/ui/env-funky-keys.rs
+@@ -1,6 +1,7 @@
+ //@ run-pass
+ //@ Ignore this test on Android, because it segfaults there.
+ 
++//@ ignore-test
+ //@ ignore-android
+ //@ ignore-windows
+ //@ ignore-cloudabi no execve
+-- 
+2.24.1
+
diff --git a/dev-lang/rust/files/1.78.0-musl-dynamic-linking.patch b/dev-lang/rust/files/1.78.0-musl-dynamic-linking.patch
new file mode 100644
index 0000000..25a281c
--- /dev/null
+++ b/dev-lang/rust/files/1.78.0-musl-dynamic-linking.patch
@@ -0,0 +1,19 @@
+From e42709c46647dab342b826d30324f3e6e5590e00 Mon Sep 17 00:00:00 2001
+From: Jory Pratt <anarchy@gentoo.org>
+Date: Tue, 2 Aug 2022 18:32:53 -0500
+Subject: [PATCH] Enable dynamic linking by default for musl
+
+Signed-off-by: Jory Pratt <anarchy@gentoo.org>
+--- a/compiler/rustc_target/src/spec/base/linux_musl.rs
++++ b/compiler/rustc_target/src/spec/base/linux_musl.rs
+@@ -10,7 +10,7 @@ pub fn opts() -> TargetOptions {
+     base.link_self_contained = LinkSelfContainedDefault::InferredForMusl;
+ 
+     // These targets statically link libc by default
+-    base.crt_static_default = true;
++    base.crt_static_default = false;
+ 
+     base
+ }
+-- 
+2.35.1
diff --git a/dev-lang/rust/rust-1.78.0.ebuild b/dev-lang/rust/rust-1.78.0.ebuild
new file mode 100644
index 0000000..eb2c9c6
--- /dev/null
+++ b/dev-lang/rust/rust-1.78.0.ebuild
@@ -0,0 +1,799 @@
+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{10..13} )
+
+inherit bash-completion-r1 check-reqs estack flag-o-matic llvm multiprocessing \
+	multilib multilib-build python-any-r1 rust-toolchain toolchain-funcs verify-sig
+
+if [[ ${PV} = *beta* ]]; then
+	betaver=${PV//*beta}
+	BETA_SNAPSHOT="${betaver:0:4}-${betaver:4:2}-${betaver:6:2}"
+	MY_P="rustc-beta"
+	SLOT="beta/${PV}"
+	SRC="${BETA_SNAPSHOT}/rustc-beta-src.tar.xz -> rustc-${PV}-src.tar.xz"
+else
+	ABI_VER="$(ver_cut 1-2)"
+	SLOT="stable/${ABI_VER}"
+	MY_P="rustc-${PV}"
+	SRC="${MY_P}-src.tar.xz"
+	KEYWORDS="~amd64 ~arm ~arm64 ~loong ~mips ~ppc ~ppc64 ~riscv ~sparc ~x86"
+fi
+
+RUST_STAGE0_VERSION="1.$(($(ver_cut 2) - 1)).0"
+
+DESCRIPTION="Systems programming language from Mozilla"
+HOMEPAGE="https://www.rust-lang.org/"
+
+SRC_URI="
+	https://static.rust-lang.org/dist/${SRC}
+	verify-sig? ( https://static.rust-lang.org/dist/${SRC}.asc )
+	!system-bootstrap? ( $(rust_all_arch_uris rust-${RUST_STAGE0_VERSION}) )
+"
+
+# keep in sync with llvm ebuild of the same version as bundled one.
+ALL_LLVM_TARGETS=( AArch64 AMDGPU ARC ARM AVR BPF CSKY DirectX Hexagon Lanai
+	LoongArch M68k Mips MSP430 NVPTX PowerPC RISCV Sparc SPIRV SystemZ VE
+	WebAssembly X86 XCore Xtensa )
+ALL_LLVM_TARGETS=( "${ALL_LLVM_TARGETS[@]/#/llvm_targets_}" )
+LLVM_TARGET_USEDEPS=${ALL_LLVM_TARGETS[@]/%/(-)?}
+
+LICENSE="|| ( MIT Apache-2.0 ) BSD BSD-1 BSD-2 BSD-4"
+
+IUSE="big-endian clippy cpu_flags_x86_sse2 debug dist doc llvm-libunwind lto miri nightly parallel-compiler profiler rustfmt rust-analyzer rust-src system-bootstrap system-llvm test wasm ${ALL_LLVM_TARGETS[*]}"
+
+# Please keep the LLVM dependency block separate. Since LLVM is slotted,
+# we need to *really* make sure we're not pulling more than one slot
+# simultaneously.
+
+# How to use it:
+# List all the working slots in LLVM_VALID_SLOTS, newest first.
+LLVM_VALID_SLOTS=( 18 )
+LLVM_MAX_SLOT="${LLVM_VALID_SLOTS[0]}"
+
+# splitting usedeps needed to avoid CI/pkgcheck's UncheckableDep limitation
+# (-) usedep needed because we may build with older llvm without that target
+LLVM_DEPEND="|| ( "
+for _s in ${LLVM_VALID_SLOTS[@]}; do
+	LLVM_DEPEND+=" ( "
+	for _x in ${ALL_LLVM_TARGETS[@]}; do
+		LLVM_DEPEND+="
+			${_x}? ( sys-devel/llvm:${_s}[${_x}(-)] )
+			wasm? ( sys-devel/lld:${_s} )"
+	done
+	LLVM_DEPEND+=" )"
+done
+unset _s _x
+LLVM_DEPEND+=" )
+	<sys-devel/llvm-$(( LLVM_MAX_SLOT + 1 )):=
+"
+
+# to bootstrap we need at least exactly previous version, or same.
+# most of the time previous versions fail to bootstrap with newer
+# for example 1.47.x, requires at least 1.46.x, 1.47.x is ok,
+# but it fails to bootstrap with 1.48.x
+# https://github.com/rust-lang/rust/blob/${PV}/src/stage0.json
+RUST_DEP_PREV="$(ver_cut 1).$(($(ver_cut 2) - 1))*"
+RUST_DEP_CURR="$(ver_cut 1).$(ver_cut 2)*"
+BOOTSTRAP_DEPEND="||
+	(
+		=dev-lang/rust-"${RUST_DEP_PREV}"
+		=dev-lang/rust-bin-"${RUST_DEP_PREV}"
+		=dev-lang/rust-"${RUST_DEP_CURR}"
+		=dev-lang/rust-bin-"${RUST_DEP_CURR}"
+	)
+"
+
+BDEPEND="${PYTHON_DEPS}
+	app-eselect/eselect-rust
+	|| (
+		>=sys-devel/gcc-4.7
+		>=sys-devel/clang-3.5
+	)
+	system-bootstrap? ( ${BOOTSTRAP_DEPEND} )
+	!system-llvm? (
+		>=dev-build/cmake-3.13.4
+		app-alternatives/ninja
+	)
+	test? ( dev-debug/gdb )
+	verify-sig? ( sec-keys/openpgp-keys-rust )
+"
+
+DEPEND="
+	>=app-arch/xz-utils-5.2
+	net-misc/curl:=[http2,ssl]
+	sys-libs/zlib:=
+	dev-libs/openssl:0=
+	system-llvm? (
+		${LLVM_DEPEND}
+		llvm-libunwind? ( sys-libs/llvm-libunwind:= )
+	)
+	!system-llvm? (
+		!llvm-libunwind? (
+			elibc_musl? ( sys-libs/libunwind:= )
+		)
+	)
+"
+
+RDEPEND="${DEPEND}
+	app-eselect/eselect-rust
+	sys-apps/lsb-release
+"
+
+REQUIRED_USE="|| ( ${ALL_LLVM_TARGETS[*]} )
+	miri? ( nightly )
+	parallel-compiler? ( nightly )
+	rust-analyzer? ( rust-src )
+	test? ( ${ALL_LLVM_TARGETS[*]} )
+	wasm? ( llvm_targets_WebAssembly )
+	x86? ( cpu_flags_x86_sse2 )
+"
+
+# we don't use cmake.eclass, but can get a warning
+CMAKE_WARN_UNUSED_CLI=no
+
+QA_FLAGS_IGNORED="
+	usr/lib/${PN}/${PV}/bin/.*
+	usr/lib/${PN}/${PV}/libexec/.*
+	usr/lib/${PN}/${PV}/lib/lib.*.so
+	usr/lib/${PN}/${PV}/lib/rustlib/.*/bin/.*
+	usr/lib/${PN}/${PV}/lib/rustlib/.*/lib/lib.*.so
+"
+
+QA_SONAME="
+	usr/lib/${PN}/${PV}/lib/lib.*.so.*
+	usr/lib/${PN}/${PV}/lib/rustlib/.*/lib/lib.*.so
+"
+
+QA_PRESTRIPPED="
+	usr/lib/${PN}/${PV}/lib/rustlib/.*/bin/rust-llvm-dwp
+	usr/lib/${PN}/${PV}/lib/rustlib/.*/lib/self-contained/crtn.o
+"
+
+# An rmeta file is custom binary format that contains the metadata for the crate.
+# rmeta files do not support linking, since they do not contain compiled object files.
+# so we can safely silence the warning for this QA check.
+QA_EXECSTACK="usr/lib/${PN}/${PV}/lib/rustlib/*/lib*.rlib:lib.rmeta"
+
+S="${WORKDIR}/${MY_P}-src"
+
+# causes double bootstrap
+RESTRICT="test"
+
+VERIFY_SIG_OPENPGP_KEY_PATH=/usr/share/openpgp-keys/rust.asc
+
+PATCHES=(
+	"${FILESDIR}"/1.78.0-musl-dynamic-linking.patch
+	"${FILESDIR}"/1.74.1-cross-compile-libz.patch
+	#"${FILESDIR}"/1.72.0-bump-libc-deps-to-0.2.146.patch  # pending refresh
+	"${FILESDIR}"/1.78.0-ignore-broken-and-non-applicable-tests.patch
+	"${FILESDIR}"/1.67.0-doc-wasm.patch
+)
+
+clear_vendor_checksums() {
+	sed -i 's/\("files":{\)[^}]*/\1/' "vendor/${1}/.cargo-checksum.json" || die
+}
+
+eapply_crate() {
+	pushd "${1:?}" > /dev/null || die
+	local patch="${2:?}"
+	eapply "${patch}"
+	"${EPREFIX}"/bin/sh "${FILESDIR}"/rehash-crate.sh "${patch}" || die
+	popd > /dev/null || die
+}
+
+toml_usex() {
+	usex "${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${fakelib}"
+}
+
+src_prepare() {
+	eapply_crate vendor/openssl-sys-0.9.92 "${FILESDIR}"/1.72.0-libressl-openssl-sys.patch
+	eapply_crate vendor/openssl-sys "${FILESDIR}"/1.77.1-libressl-openssl-sys.patch
+
+	# Clear vendor checksums for crates that we patched to bump libc.
+	# NOTE: refresh this on each bump.
+	#for i in addr2line-0.20.0 bstr cranelift-jit crossbeam-channel elasticlunr-rs handlebars icu_locid libffi \
+	#	terminal_size tracing-tree; do
+	#	clear_vendor_checksums "${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_ >> "${S}"/config.toml
+				crt-static = false
+			_EOF_
+		fi
+	done
+	if use wasm; then
+		wasm_target="wasm32-unknown-unknown"
+		export CFLAGS_${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
+}