904b4f5a27
`ASTReader::FinishedDeserializing()` calls `adjustDeductedFunctionResultType(...)` [0], which in turn calls `FunctionDecl::getMostRecentDecl()`[1]. In modules builds, `getMostRecentDecl()` may reach out to the `ASTReader` and start deserializing again. Starting deserialization starts `ReadTimer`; however, `FinishedDeserializing()` doesn't call `stopTimer()` until after it's call to `adjustDeductedFunctionResultType(...)` [2]. As a result, we hit an assert checking that we don't start an already started timer [3]. To fix this, we simply don't start the timer if it's already running. Unfortunately I don't have a test case for this yet as modules builds are notoriously difficult to reduce. [0]:4d2288d318/clang/lib/Serialization/ASTReader.cpp (L11053)[1]:4d2288d318/clang/lib/AST/ASTContext.cpp (L3804)[2]:4d2288d318/clang/lib/Serialization/ASTReader.cpp (L11065-L11066)[3]:4d2288d318/llvm/lib/Support/Timer.cpp (L150)
C language Family Front-end
Welcome to Clang.
This is a compiler front-end for the C family of languages (C, C++ and Objective-C) which is built as part of the LLVM compiler infrastructure project.
Unlike many other compiler frontends, Clang is useful for a number of things beyond just compiling code: we intend for Clang to be host to a number of different source-level tools. One example of this is the Clang Static Analyzer.
If you're interested in more (including how to build Clang) it is best to read the relevant websites. Here are some pointers:
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Information on Clang: http://clang.llvm.org/
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Building and using Clang: http://clang.llvm.org/get_started.html
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Clang Static Analyzer: http://clang-analyzer.llvm.org/
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Information on the LLVM project: http://llvm.org/
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If you have questions or comments about Clang, a great place to discuss them is on the Clang forums:
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If you find a bug in Clang, please file it in the LLVM bug tracker: