[llvm-bugs] [Bug 27170] New: Clang produces malformed coverage mapping data

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=27170

            Bug ID: 27170
           Summary: Clang produces malformed coverage mapping data
           Product: clang
           Version: 3.8
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: vsk at apple.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Simple reproducer:

$ echo "void foo() {}" | ./bin/clang -x c -fprofile-instr-generate
-fcoverage-mapping - -c -o - | ./bin/llvm-cov show - -instr-profile=none
error: Failed to load coverage: Malformed coverage data

Bisected to: r230676

This issue was fixed on trunk after r260117, but it affects llvm 3.8.

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