[LLVMbugs] [Bug 20403] New: Thread Safety Analysis "guarded_by" attribute doesn't work for struct fields in C code

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20403

            Bug ID: 20403
           Summary: Thread Safety Analysis "guarded_by" attribute doesn't
                    work for struct fields in C code
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: matthew at dempsky.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

$ cat demo.c
struct mutex {
        int x;
};

struct guarded_int {
        struct mutex mu;
        int value __attribute__((guarded_by(mu))); 
};

$ clang -c demo.c
demo.c:7:38: error: use of undeclared identifier 'mu'
        int value __attribute__((guarded_by(mu)));
                                            ^
1 error generated.

Clang compiles the code okay with "-x c++", so it seems to be a bug in how
Thread Safety Analysis is wired into the C frontend.

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