backport: bump gcc and clang minimums; enforce c++20 #5971

PastaPastaPasta · 2024-04-04T05:45:25Z

Issue being fixed or feature implemented

Backport some PRs to move towards cpp20; this bumps clang and gcc versions as well as boost

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Built

Breaking Changes

None really

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Go over all the following points, and put an x in all the boxes that apply.

I have performed a self-review of my own code
I have commented my code, particularly in hard-to-understand areas
I have added or updated relevant unit/integration/functional/e2e tests
I have made corresponding changes to the documentation
I have assigned this pull request to a milestone (for repository code-owners and collaborators only)

knst · 2024-04-04T06:09:46Z

contrib/containers/ci/Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:focal
+FROM ubuntu:jammy


focal is still supported, it's 5 years, until April 2025.

can we still keep focal for C++20? is gcc-10 available for it?

I think we need to bump it for CI because the version of g++-mingw-w64-x86-64 in focal in only based on gcc-9 whereas in jammy it's on gcc-10; and unlike most other gcc packages, there's no way to specify a version for it. I don't think bumping CI to jammy precludes anyone from running or building on focal

Bitcoin lets to use for different testing targets to use different ubuntu version, and even not ubuntu, but something like CentOS (in the past at least).
We have an option to use the one docker image for all CI tests. So, if we test with newer version ubuntu - the older one is not tested (and we won't know if build is broken). For newer version of ubuntu (the latest one) usually I run builds on my localhost :)

@UdjinM6 any though if we can use different docker images for different CI tests? I'd like to see the oldest supported (20.04 probably now) and the newest release (23.10 which will be superseeded by 24.04 soon).

could we get g++-mingw-w64-x86-64 version 10 from the third party repo maybe?

knst · 2024-04-04T14:55:14Z

CI fails in unit tests due to difference in path, seems as on different version of boost returned path are different due to '/' at the end.
Bitcoin stopped using boost for paths since Merge #20744: Use std::filesystem. Remove Boost Filesystem & System

wallet/test/init_tests.cpp(93): error: in "init_tests/walletinit_verify_walletdir_no_trailing2": check walletdir == expected_path has failed ["/tmp/test_common_Dash Core/a7b09de0edccd9693b66f24f78b5c9882b064efd6e64a86bf42deabbefd00a39/wallets/" != "/tmp/test_common_Dash Core/a7b09de0edccd9693b66f24f78b5c9882b064efd6e64a86bf42deabbefd00a39/wallets"]

(I assume so, haven't tried to fix/deeply investigate)

knst · 2024-04-09T19:18:14Z

I think this backport is problematic for experimental CI cxx20:

Merge https://github.com/bitcoin/bitcoin/pull/24460: build: update ax_cxx_compile_stdcxx to serial 14

also, what's about this fix? knst@019824d

github-actions · 2024-04-12T15:22:32Z

This pull request has conflicts, please rebase.

knst · 2024-04-15T18:45:31Z

check this one also: knst@5e8921b

PastaPastaPasta · 2024-04-16T13:38:49Z

Anyone know what'a going on here: https://gitlab.com/dashpay/dash/-/jobs/6614869261?

knst · 2024-04-16T13:43:57Z

configure:5567: clang++-16 -std=c++20 -c -pipe -O1 -Werror -Wno-unused-command-line-argument -Wno-unused-value -Wno-deprecated-builtins -D_GLIBCXX_DEBUG -D_GLIBCXX_DEBUG_PEDANTIC -D_LIBCPP_DEBUG=1 -I/builds/dashpay/dash/depends/x86_64-pc-linux-gnu/include/ -DDEBUG_LOCKORDER -DARENA_DEBUG conftest.cpp >&5
conftest.cpp:104:36: error: volatile-qualified parameter type 'volatile int' is deprecated [-Werror,-Wdeprecated-volatile]
    test(const int c, volatile int v) // 'volatile is deprecated in C++20'
                                   ^
1 error generated.

this warning "error: volatile-qualified parameter type 'volatile int' is deprecated [-Werror,-Wdeprecated-volatile]" becomes an error due to flag -Werror.
Because it fails with compilation error, autoconf things that clang++-16 doesn't support C++20.

knst · 2024-04-23T14:17:44Z

ci/test/00_setup_env_native_cxx20.sh

@@ -13,5 +13,5 @@ export CPPFLAGS="-DDEBUG_LOCKORDER -DARENA_DEBUG"
 export PYZMQ=true
 export RUN_FUNCTIONAL_TESTS=false
 export GOAL="install"
-export BITCOIN_CONFIG="--enable-zmq --enable-reduce-exports --enable-crash-hooks --enable-c++20"
+export BITCOIN_CONFIG="--enable-zmq --enable-reduce-exports --enable-crash-hooks"


this changes are super-seed this commit: ebc5695 (I assume)

979a8c9: should probably rename linux64_cxx20 job (and ci/test/00_setup_env_native_cxx20.sh file) now

…n to 10 fa5423b refactor: Remove unused gcc-9 workaround in txrequest (MarcoFalke) fa918d3 Always enable -Wsuggest-override (MarcoFalke) faea58e Bump g++ minimum supported version to 10 (MarcoFalke) Pull request description: All supported operating systems ship with g++ 10 (or later), so bumping the minimum should not cause any issues. The bump allows to drop some now-unused workarounds. For reference: * https://packages.debian.org/bullseye/g++ (`g++-10`) * https://packages.ubuntu.com/focal/g++-10 * FreeBSD 12/13 ships with g++ 12 * CentOS-like 9 ships with g++ 11 * OpenSuse Tumbleweed ships with g++ 13 https://software.opensuse.org/package/gcc13-c++ (No idea about OpenSuse Leap) This is for Bitcoin Core 27.0 in 2024 (next year), not the soon upcoming 26.0 next month. ACKs for top commit: fanquake: ACK fa5423b Tree-SHA512: 6f0697ae4c0f578873591b7872bf158aba3af17f171c3556b593a70ec379bf94c7a9dd7697e8e79173edd4ac3c81a376e0cbbc0cfabde1a1cfe5f9b5eaea6831

fix: add update alternatives for arm gcc fix: add update alternatives for arm g++

knst · 2024-04-23T19:20:29Z

depends/packages/qt.mk

@@ -39,7 +39,7 @@ $(package)_config_opts_release += -silent
 $(package)_config_opts_debug = -debug
 $(package)_config_opts_debug += -optimized-tools
 $(package)_config_opts += -bindir $(build_prefix)/bin
-$(package)_config_opts += -c++std c++17
+$(package)_config_opts += -c++std c++2a


28349 is partial: some code is supposed to be removed by this backport, but it is added only in bitcoin#27401.

contrib/guix/manifest.scm

UdjinM6 · 2024-04-23T20:15:26Z

ci/test/00_setup_env_native_cxx20.sh

@@ -13,5 +13,5 @@ export CPPFLAGS="-DDEBUG_LOCKORDER -DARENA_DEBUG"
 export PYZMQ=true
 export RUN_FUNCTIONAL_TESTS=false
 export GOAL="install"
-export BITCOIN_CONFIG="--enable-zmq --enable-reduce-exports --enable-crash-hooks --enable-c++20"
+export BITCOIN_CONFIG="--enable-zmq --enable-reduce-exports --enable-crash-hooks"


979a8c9: should probably rename linux64_cxx20 job (and ci/test/00_setup_env_native_cxx20.sh file) now

ff42d81 guix: use clang-toolchain-15 for macOS compilation (fanquake) 94955b4 depends: use LLVM/Clang 15.0.6 for macOS cross-compile (fanquake) Pull request description: This will end up being a blocker for bitcoin#28210, and is already part of bitcoin#21778, even though an even newer LLVM/Clang combination is required (and still missing from upstream Guix). Seems straight-forward enough to just bump the macOS compiler to a more modern Clang. ACKs for top commit: TheCharlatan: re-ACK ff42d81 Tree-SHA512: 8af4b54c3a56abb3825c6470444a28e14e9c69820c09ec4a33acebb8ae434df9ae18163c088a582130cc68755293a7e2bde5d065763919d94064ff9b3f83730f

fa7dada build: update ax_cxx_compile_stdcxx to serial 14 (MarcoFalke) Pull request description: No strong reason for the bump, but this makes it easier to experiment with cpp20, see bitcoin#24169 (comment) ACKs for top commit: Empact: Code Review ACK bitcoin@fa7dada fanquake: ACK fa7dada Tree-SHA512: bd3e884bae5319d434520a2947608913c3884de89aa563aa46ef17ba4e5b41ba209bd4780c8eaf81648297b2dc9534803be88d1b214ad05a93ee5992bee887c0

fa6e50d fuzz: Use C++20 starts_with in rpc.cpp (MarcoFalke) faa4838 Revert "tracepoints: Disables `-Wgnu-zero-variadic-macro-arguments` to compile without warnings" (MarcoFalke) fae3b77 refactor: Drop unused _Pragma to ignore -Wgnu-zero-variadic-macro-arguments (MarcoFalke) fa02fc0 refactor: modernize-use-default-member-init for bit-fields (C++20) (MarcoFalke) fa67f09 build: Require C++20 compiler (MarcoFalke) Pull request description: C++20 allows to write safer code, because it allows to enforce more stuff at compile time (`constinit`, `conteval`, `constexpr`, `std::span`, ...). Also, it allows to write less verbose and easier to understand code (C++ 20 Concepts). See bitcoin#23363 and https://en.cppreference.com/w/cpp/compiler_support#cpp20 With g++-10 (bitcoin#28348) and clang-13 (bitcoin#28210), there is broad support for almost all features of C++20. It should be fine to require a C++20 compiler for Bitcoin Core 27.0 in 2024 (next year), not the soon upcoming 26.0 next month. This pull request includes three small cleanups to make use of C++20 features. If any issues are detected before or after merge, this should be easy to revert. If no issues arise, it should be fine to make use of more involved C++20 features later on. ACKs for top commit: fanquake: ACK fa6e50d Tree-SHA512: 244d79bfb0b750a4bdd713f40573b9ca33816fb84b6c84a58f027b9d7d4bb0cc4f18642959e4cf3d094808a69e5b8a327ca8521d7c0c08af27dacb5da3e78e71

UdjinM6 · 2024-04-25T19:12:22Z

win64 build failed:

checking whether x86_64-w64-mingw32-g++ supports C++20 features with -std=c++20... no
checking whether x86_64-w64-mingw32-g++ supports C++20 features with +std=c++20... no
checking whether x86_64-w64-mingw32-g++ supports C++20 features with -h std=c++20... no
configure: error: *** A compiler with support for C++20 language features is required.

https://gitlab.com/dashpay/dash/-/jobs/6707924746#L123

PastaPastaPasta · 2024-04-27T02:07:28Z

win64 build failed:

checking whether x86_64-w64-mingw32-g++ supports C++20 features with -std=c++20... no
checking whether x86_64-w64-mingw32-g++ supports C++20 features with +std=c++20... no
checking whether x86_64-w64-mingw32-g++ supports C++20 features with -h std=c++20... no
configure: error: *** A compiler with support for C++20 language features is required.

https://gitlab.com/dashpay/dash/-/jobs/6707924746#L123

CI is passing now

UdjinM6

Guix build failed with

INFO: Building 20.1.1-525-gc9668b121751 for platform triple x86_64-apple-darwin:
...
/root/dash/contrib/guix/manifest.scm:618:17: error: clang-toolchain-15: unbound variable
hint: Did you forget a `use-modules' form?

contrib/guix/manifest.scm

… prepare for building with upstream LLVM 3df6070 contrib: remove macOS lazy_bind check (fanquake) 9bc357e build: explicitly opt-in to new fixup_chains functionality for darwin (Cory Fields) fb61bc0 depends: Bump MacOS minimum runtime requirement to 11.0 (Cory Fields) c2cd472 depends: bump darwin clang to 11.1 (Cory Fields) Pull request description: This (I believe) resolves the last of the blockers for [switching us away from cctools and instead using out-of-the-box llvm and lld](bitcoin#21778) for building Darwin binaries. For now, we continue building with a pre-packaged llvm and cctools, but after this PR the clang+lld combo should just work for anyone trying it. Additionally after this PR, the new runtime `fixup_chains` behavior will be in-use, as ld64 uses it as well. The commits may seem unrelated, so in detail: lld (llvm's linker) has been a work-in-progress for Darwin for years. Recently though, it has gained nearly all of the features we require. The last missing feature from ld64, `-Wl,-bind_at_load`, is not implemented in lld; as far as I can tell [lazy loading has conceptually been replaced by fixup chains](https://www.emergetools.com/blog/posts/iOS15LaunchTime). So that means we don't need ld64's `bind_at_load` as long as lld can handle `-Wl,-fixup_chains` (which it can). I've added it to our configure as a linker option mostly so that we can see it in the logs; it's default-on as long as the minimum version is >11.0. About that: the runtime functionality required for `-Wl,-fixup_chains` [requires macOS >=11.0](https://github.com/llvm/llvm-project/blob/release/16.x/lld/MachO/Driver.cpp#L1021). Hence the commit that bumps the minimum version. Our current min runtime of `10.15` has been unsupported since September 2022, so I don't expect this bump to be controversial. Lastly, with the minimum runtime version bumped to 11.0, our current version of pre-compiled clang we use for macOS is too old to understand `-mmacosx-version-min=11.0` because it expects `=10.x`. So I've made the smallest possible bump (from 10.0.1 to 11.1.0) to a version that understands. This bump is arbitrary and unfortunate, but likely to be short-lived as we may end up replacing it with llvm+lld for v26 anyway. I've held off on bumping the SDK as I think that makes sense to do as part of the lld switch instead. ACKs for top commit: hebasto: ACK 3df6070 gruve-p: ACK bitcoin@3df6070 fanquake: ACK 3df6070 TheCharlatan: ACK 3df6070 Tree-SHA512: 0200ec4a3b88df33877ae82c15b5c04d745852550923f491a354b391cac65f88e4df116a40055c23a8cbcfcdfb9a376c6ae8fdd0e898e7b966bc213dcb5857cf

DashCoreAutoGuix · 2024-05-01T19:38:07Z

Guix Automation has began to build this PR tagged as v21.0.0-devpr5971.439f6d16. A new comment will be made when the image is pushed.

DashCoreAutoGuix · 2024-05-01T21:18:15Z

Guix Automation has completed; a release should be present here: https://github.com/dashpay/dash-dev-branches/releases/tag/v21.0.0-devpr5971.439f6d16. The image should be on dockerhub soon.

UdjinM6 · 2024-05-09T18:27:05Z

Guix build failed with

INFO: Building 20.1.1-525-gc9668b121751 for platform triple x86_64-apple-darwin:
...
/root/dash/contrib/guix/manifest.scm:618:17: error: clang-toolchain-15: unbound variable
hint: Did you forget a `use-modules' form?

still fails with the same error...

UdjinM6 · 2024-05-10T09:04:47Z

Guix build failed with

INFO: Building 20.1.1-525-gc9668b121751 for platform triple x86_64-apple-darwin:
...
/root/dash/contrib/guix/manifest.scm:618:17: error: clang-toolchain-15: unbound variable
hint: Did you forget a `use-modules' form?

still fails with the same error...

Some progress here https://gitlab.com/UdjinM6/dash/-/commits/pr5971: backporting 28294, 28324 and 28328 solves this specific issue it seems but then guix fails to build boost. Bumping boost version to 1.81 doesn't help (or isn't enough). 🤷‍♂️

EDIT: also, boost 1.81 breaks wallet unit tests

github-actions · 2024-08-07T02:22:31Z

This pull request has conflicts, please rebase.

PastaPastaPasta added this to the 21 milestone Apr 4, 2024

knst added the guix-build label Apr 4, 2024

knst reviewed Apr 4, 2024

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knst removed the guix-build label Apr 4, 2024

PastaPastaPasta changed the title ~~backport: bump boost, gcc, clang~~ backport: bump gcc and clang minimums Apr 4, 2024

PastaPastaPasta force-pushed the new-cpp20 branch from f59d40e to 27a386e Compare April 4, 2024 17:54

github-actions bot added the needs rebase label Apr 12, 2024

PastaPastaPasta force-pushed the new-cpp20 branch 2 times, most recently from 659fcb9 to ebc5695 Compare April 12, 2024 16:43

github-actions bot removed the needs rebase label Apr 12, 2024

knst reviewed Apr 23, 2024

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fanquake and others added 2 commits April 23, 2024 09:46

ci: use g++-10

0f87843

fix: add update alternatives for arm gcc fix: add update alternatives for arm g++

PastaPastaPasta force-pushed the new-cpp20 branch from 1f8e5b2 to 9402366 Compare April 23, 2024 14:47

PastaPastaPasta mentioned this pull request Apr 23, 2024

feat: require c++20 compiler #5605

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knst reviewed Apr 23, 2024

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UdjinM6 reviewed Apr 23, 2024

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fanquake and others added 7 commits April 24, 2024 10:45

fix: make sure we use version 10 of gcc

c854db4

ci: drop not unneeded cxx20 specific ci build

b587dfe

fix: suppress deprecated-volatile in fuzz build

b26c957

fix: resolve detection issue of c++20 when using g++10

6e95915

PastaPastaPasta force-pushed the new-cpp20 branch from 9402366 to b26c957 Compare April 24, 2024 15:51

PastaPastaPasta changed the title ~~backport: bump gcc and clang minimums~~ backport: bump gcc and clang minimums; enforce c++20 Apr 27, 2024

PastaPastaPasta added the guix-build label Apr 27, 2024

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backport: bump gcc and clang minimums; enforce c++20 #5971

backport: bump gcc and clang minimums; enforce c++20 #5971

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backport: bump gcc and clang minimums; enforce c++20 #5971

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PastaPastaPasta commented Apr 4, 2024

Issue being fixed or feature implemented

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