depends: modernize clang flags for Darwin #27798

pull theuni wants to merge 2 commits into bitcoin:master from theuni:darwin-cross-modernize-flags changing 2 files +17 −36
  1. theuni commented at 10:18 pm on May 31, 2023: member

    This is a cleaner and simpler alternative to #25098. Inspired by this conversation. The diff is large but the change itself is quite small.

    Fixes builds with llvm >= 11 in guix by working around the problem. As a bonus, this is much cleaner and more maintainable than what we had before.

    See the updated comment for more info. At a high level: rather than playing tricks and trying to work around clang’s default includes, disable them and re-add what we want.

  2. DrahtBot commented at 10:18 pm on May 31, 2023: contributor

    The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

    Reviews

    See the guideline for information on the review process.

    Type Reviewers
    ACK fanquake, TheCharlatan
    Concept ACK hebasto

    If your review is incorrectly listed, please react with 👎 to this comment and the bot will ignore it on the next update.

    Conflicts

    Reviewers, this pull request conflicts with the following ones:

    • #21778 (build: LLVM 15 & LLD based macOS toolchain by fanquake)

    If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.

  3. DrahtBot added the label Build system on May 31, 2023
  4. hebasto commented at 10:28 pm on May 31, 2023: member
    Concept ACK.
  5. DrahtBot added the label CI failed on Jun 1, 2023
  6. in depends/hosts/darwin.mk:64 in 1c0c344b0f outdated 
    60@@ -63,53 +61,33 @@ $(foreach TOOL,$(cctools_TOOLS),$(eval darwin_$(TOOL) = $$(build_prefix)/bin/$$(
61 #         Explicitly point to our binaries (e.g. cctools) so that they are
62 #         ensured to be found and preferred over other possibilities.
63 #
64-#     -stdlib++-isystem$(OSX_SDK)/usr/include/c++/v1
65+#     -isysroot$(OSX_SDK) -nostdlibinc
    maflcko commented at 6:23 am on June 1, 2023:

    from CI:

    0clang: error: argument unused during compilation: '-nostdlibinc' [-Werror,-Wunused-command-line-argument]
    theuni commented at 11:49 am on June 1, 2023:
    ffs…
    theuni commented at 4:38 pm on June 2, 2023:

    Fixed upstream: https://github.com/llvm/llvm-project/commit/5b77e752dcd073846b89559d6c0e1a7699e58615 for clang 17.

    :D

  7. theuni commented at 5:49 pm on June 2, 2023: member

    @fanquake and @hebasto have both pointed out to me in discussions that this works even without the -nostdlibinc. That is purely accidental and coincidental, as the addition of -nostdlibinc is what’s intended to make the other changes here work.

    By sheer luck though, they manage to put everything in the correct order such that the poisoned paths come last in the search-order. That feels brittle, but maybe good enough.

    I’d also like to see what the consequences of the argument unused during compilation warning are as it’ll be quite a while until we’re using clang 17. If it turns out to only be a problem with our -Werror build, we can probably just hack around it. But I suspect that some libs in depends may be degraded due to failing configure checks. Will have a look.

  8. theuni commented at 7:11 pm on June 16, 2023: member

    I’d also like to see what the consequences of the argument unused during compilation warning are as it’ll be quite a while until we’re using clang 17. If it turns out to only be a problem with our -Werror build, we can probably just hack around it. But I suspect that some libs in depends may be degraded due to failing configure checks. Will have a look.

    I tested this in detail today. I minimally patched clang-12 and built from depends with and without the patch. I’ve verified that at least bitcoind, bitcoiin-qt, and univalue/test/object (one of the c-i offenders) are all identical.

    config.log shows a few differences which boil down to:

    0-ax_cv_PTHREAD_CLANG_NO_WARN_FLAG=-Qunused-arguments
1+ax_cv_PTHREAD_CLANG_NO_WARN_FLAG=no

    Because a few tests are thrown off by the warning.

    And the end-result is:

    0-PTHREAD_CFLAGS='-Qunused-arguments -pthread'
1+PTHREAD_CFLAGS='-pthread'

    So.. only cosmetic, and nothing that changes the final binaries.

    I propose that we take this commit as-is, with one on top to keep c-i from failing for this particular warning. So we just need to stick a -Wno-error,-Wunused-command-line-argument somewhere.

    I think that makes sense because eventually (once clang17+ becomes the norm) everything will work perfectly, and before then there may just be a few harmless warnings. @fanquake Thoughts? If you agree, where’s the best place to disable the Werror?

  9. fanquake commented at 4:48 pm on June 20, 2023: member

    If you agree, where’s the best place to disable the Werror?

    I think it’s best to just suppress in 00_setup_env_mac.sh. You can add a CXXFLAGS="-Wno-error,-Wunused-command-line-argument" to BITCOIN_CONFIG.

  10. theuni force-pushed on Jun 20, 2023
  11. theuni commented at 6:33 pm on June 20, 2023: member

    If you agree, where’s the best place to disable the Werror?

    I think it’s best to just suppress in 00_setup_env_mac.sh. You can add a CXXFLAGS="-Wno-error,-Wunused-command-line-argument" to BITCOIN_CONFIG.

    Done. Scoped to LDFLAGS because that should be enough. We’ll see if the c-i likes it.

  12. theuni commented at 7:08 pm on June 20, 2023: member
    Failures are unrelated, macOS test is now happy.
  13. maflcko added the label DrahtBot Guix build requested on Jun 20, 2023
  14. ci: disable false-positive warnings for now 
    clang <=17 warns on -nostdlibinc, which causes an error on our -Werror builds.

Note that this breaks the "-fPIE" check in configure because it relies on
catching warnings, but that is not a problem for macOS.
    2a85857ce5
  15. depends: modernize clang flags 
    Fixes builds with llvm >= 11 in guix by working around the problem. As a bonus,
this is much cleaner and more maintainable than what we had before.
    cbee1d7091
  16. theuni force-pushed on Jun 20, 2023
  17. DrahtBot commented at 2:23 am on June 21, 2023: contributor

    Guix builds

    File commit e4bbfb2d495291010914767321beb07ff5194b61(master) commit 86fccc5c635acc45cac16c61f49b1ed6b9c7236d(master and this pull)
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    *.tar.gz 0f8e5a3581a7440b... d0b268d9f625d0cf...
    guix_build.log b46d4373d4d794e9... 018fdaa8523dd11f...
    guix_build.log.diff 375bafc4dd7a5141...
  18. DrahtBot removed the label DrahtBot Guix build requested on Jun 21, 2023
  19. fanquake commented at 11:12 am on June 21, 2023: member

    Guix Build:

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  20. fanquake requested review from TheCharlatan on Jun 21, 2023
  21. fanquake approved
  22. fanquake commented at 11:28 am on June 21, 2023: member
    ACK cbee1d70918b7c8e524c07f3da7049c3a1a2cbff - tested Guix and the depends cross-compile. Would like to move this along, to unblock #27676, which itself might be a blocker for #27897. Note that macOS might seem somewhat in flux for the moment, but once we finish the migration to LLVM Clang + LLD, things will be must simpler, and ultimately more maintainable.
  23. TheCharlatan commented at 6:25 pm on June 21, 2023: contributor 
     0find guix-build-$(git rev-parse --short=12 HEAD)/output/ -type f -print0 | env LC_ALL=C sort -z | xargs -r0 sha256sum
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  24. TheCharlatan approved
  25. TheCharlatan commented at 7:11 pm on June 21, 2023: contributor

    ACK cbee1d70918b7c8e524c07f3da7049c3a1a2cbff

    This indeed seems “more modern”. I did check that this still compiles on my systems, did not verify if the binaries actually run though.

  26. fanquake merged this on Jun 22, 2023
  27. fanquake closed this on Jun 22, 2023
  28. sidhujag referenced this in commit de3fee1023 on Jun 22, 2023
  29. hebasto commented at 4:35 pm on June 23, 2023: member
    Post-merge ACK cbee1d70918b7c8e524c07f3da7049c3a1a2cbff.
  30. Fabcien referenced this in commit 082d9ee179 on Mar 1, 2024
  31. bitcoin locked this on Jun 22, 2024


theuni DrahtBot hebasto maflcko fanquake TheCharlatan

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