https://llvm.org/bugs/show_bug.cgi?id=24215
Bug ID: 24215 Summary: Downgrade "redeclaration cannot add dllimport" error to a warning Product: clang Version: trunk Hardware: PC OS: Linux Status: NEW Severity: normal Priority: P Component: -New Bugs Assignee: unassignedclangb...@nondot.org Reporter: h...@chromium.org CC: eldlistmaili...@tropicsoft.com, llvmbugs@cs.uiuc.edu Classification: Unclassified In the following code: extern "C" void sleep(unsigned ms); void f() { sleep(1000); } extern "C" __declspec(dllimport) void sleep(unsigned ms); Clang will error: /tmp/a.cc:7:39: error: redeclaration of 'sleep' cannot add 'dllimport' attribute extern "C" __declspec(dllimport) void sleep(unsigned ms); ^ /tmp/a.cc:1:17: note: previous declaration is here extern "C" void sleep(unsigned ms); ^ The problem is that Clang will already have generated IR for the sleep() declaration after emitting f(). Because the IR has already been generated, the 'dllimport' attribute won't be added and the compiler errors. In practice, this code would still work as it will link against the thunk for sleep(). Pointer identity will be broken, but that is probably not serious enough to error about. -- You are receiving this mail because: You are on the CC list for the bug.
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