Replace a cmake option with a preprocessor macro. #7469
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When moving to the swift-4.0-branch of LLVM, we started using the LLVM_DISABLE_ABI_BREAKING_CHECKS_ENFORCING cmake option to turn off those checks. This was necessary for the stdlib build, where it uses some LLVM headers without linking libSupport.a, but the cmake option forced us to disable the checks across the board. It also caused a lot of churn for people who needed to remove their cmake caches when switching to the new version of LLVM. This change switches to use a preprocessor macro to disable the checks only in the context of the stdlib build. It requires LLVM r295090. rdar://problem/30098953
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I need to hold onto this until the LLVM change propagates to the stable branch. |
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@swift-ci please test |
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I'm going to hold this for a bit longer to make it more likely that people will have updated their LLVM builds and will not be impacted by this. |
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I'm planning to merge this tomorrow (Friday). I sent a heads-up message to swift-dev. |
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When moving to the swift-4.0-branch of LLVM, we started using the
LLVM_DISABLE_ABI_BREAKING_CHECKS_ENFORCING cmake option to turn off those
checks. This was necessary for the stdlib build, where it uses some LLVM
headers without linking libSupport.a, but the cmake option forced us to
disable the checks across the board. It also caused a lot of churn for
people who needed to remove their cmake caches when switching to the new
version of LLVM. This change switches to use a preprocessor macro to
disable the checks only in the context of the stdlib build. It requires
LLVM r295090. rdar://problem/30098953