[llvm-bugs] [Bug 38745] New: clang++ fails early initialization for function static variable

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38745

            Bug ID: 38745
           Summary: clang++ fails early initialization for function static
                    variable
           Product: clang
           Version: 6.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: timj at gnu.org
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

Created attachment 20790
  --> https://bugs.llvm.org/attachment.cgi?id=20790&action=edit
Demo for lack of initialization of a static variable at function scope

Code generated with clang version 4.0.1-6 or 6.0.0-1ubuntu2 crashes due to an
uninitialized unordered_map during execution of static ctors. The map should
have been initialized as a static variable during the first call to a singleton
accessor.
Various g++ versions (tested up to 7.2.0) produce properly working code for the
attached test case.
Note that moving the static unordered_map out of the singleton function into
global scope works and doesn't trigger the issue.

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