[LLVMbugs] [Bug 20599] New: Segfault while evaluating a lambda.

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Fri Aug 8 16:38:29 PDT 2014


            Bug ID: 20599
           Summary: Segfault while evaluating a lambda.
           Product: clang
           Version: 3.4
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: davidsiaw at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Full source code including build scripts can be found here:

Full logs and reproductions can be found here:

This bug is always reproducible. All the code is available publicly, uses
autoconf and automake to build and a description of the environment can be
found in http://docs.travis-ci.com/user/ci-environment/

You can also fork the source code and test it on a ubuntu-like environment.


The following is an excerpt of the code compiled. clang seems to be segfaulting
on the for_each line at `fmt`. The lambda contains another lambda, and clang is
segfaulting on the inside where fmt.ForeachMember is called. This however works
on g++ 4.8

    void Generate(std::wstring name, std::vector<FormatDesc> format,
std::wostream& output)
        TScheme sch(name);

        for_each(format.begin(), format.end(), [&](FormatDesc fmt)
            sch.GenerateStructOpening(fmt.GetName(), output);

            fmt.ForeachMember([&](FormatMember& member)

Unlike the other bugs, this is a really simple usage of a vector. No static
members, no initializers, no friend class, no user-defined operator().

Could be related to 20046, but there is no call to variable template here
inside the lambda the entire class this function is inside is a template class.

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