mac: Bump clang deployment target to macOS 10.12

10.12 is 6 years old by now. It's below the minimum version required
to run Chrome. So let's require it to run chromium's toolchain
binaries as well.

This has a number of minor advantages:
- lld doesn't support writing the load commands needed on 10.7,
  so this removes one blocker for using lld as host linker.
- We don't have to explicitly pass -stdlib flags around when building
  clang
- Once upstream switches to C++17, we'll get a better RWLock
  implementation in LLVM if we require 10.12

Neither of these is a hard requirement for anything and they can
all be worked around. But there's no reason to support running
our clang on such old macOS versions, and doing so makes things
slightly simpler and better tested upstream.

Bug: 1348586,1349636
Change-Id: Ib1f88801208822ea89d47a30a26abc9d1a0391dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3807240
Reviewed-by: Hans Wennborg <hans@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Arthur Eubanks <aeubanks@google.com>
Cr-Commit-Position: refs/heads/main@{#1031261}
2 files changed
tree: 5d71692bdff0fac63bebc99fd8396044583f14d3
  1. android_webview/
  2. apps/
  3. ash/
  4. base/
  5. build/
  6. build_overrides/
  7. buildtools/
  8. cc/
  9. chrome/
  10. chromecast/
  11. chromeos/
  12. codelabs/
  13. components/
  14. content/
  15. courgette/
  16. crypto/
  17. dbus/
  18. device/
  19. docs/
  20. extensions/
  21. fuchsia_web/
  22. gin/
  23. google_apis/
  24. google_update/
  25. gpu/
  26. headless/
  27. infra/
  28. ios/
  29. ipc/
  30. media/
  31. mojo/
  32. native_client_sdk/
  33. net/
  34. pdf/
  35. ppapi/
  36. printing/
  37. remoting/
  38. rlz/
  39. sandbox/
  40. services/
  41. skia/
  42. sql/
  43. storage/
  44. styleguide/
  45. testing/
  46. third_party/
  47. tools/
  48. ui/
  49. url/
  50. weblayer/
  51. .clang-format
  52. .clang-tidy
  53. .eslintrc.js
  54. .git-blame-ignore-revs
  55. .gitattributes
  56. .gitignore
  57. .gn
  58. .mailmap
  59. .rustfmt.toml
  60. .vpython
  61. .vpython3
  62. .yapfignore
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. DEPS
  68. DIR_METADATA
  69. ENG_REVIEW_OWNERS
  70. LICENSE
  71. LICENSE.chromium_os
  72. OWNERS
  73. PRESUBMIT.py
  74. PRESUBMIT_test.py
  75. PRESUBMIT_test_mocks.py
  76. README.md
  77. WATCHLISTS
README.md

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