http://llvm.org/bugs/show_bug.cgi?id=19357
Bug ID: 19357
Summary: cyclic module dependencies can deadlock
Product: clang
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Modules
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
If module A depends on module B, and module B depends on module A, and we
perform a -j2 build where one action builds module A first and the other builds
B first, those two build steps can deadlock, because each of them first
acquires the lock for the being-built module then tries to wait for the other
module's lock.
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