[LLVMbugs] [Bug 20737] New: clang does not mangle __thread variables like MingW (__emutls_v. prefix is missing)

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20737

            Bug ID: 20737
           Summary: clang does not mangle __thread variables like MingW
                    (__emutls_v. prefix is missing)
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: yaron.keren at gmail.com
                CC: llvmbugs at cs.uiuc.edu, rnk at google.com
    Classification: Unclassified

echo __thread unsigned a; > tls.cpp & clang -c -target i686-pc-windows-gnu
tls.cpp & nm tls.o

produces '00000000 D _a'
whereas

echo __thread unsigned a; > tls.cpp & gcc -c tls.cpp & nm tls.o
produces '00000000 D ___emutls_v.a'

this prevent the use of <mutex> in clang-compiled modules since it uses two tls
variables, 'once_call' and 'once_callable' which are mangled to 

__emutls_v._ZSt11__once_call
__emutls_v._ZSt15__once_callable

whereas the clang-compiled object refers to

_ZSt11__once_call
_ZSt15__once_callable

is the solution just prefixing '__emutls_v.' to __thread variables?

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