[llvm-bugs] [Bug 40156] New: OpenMP/declare_reduction_codegen.cpp, OpenMP/parallel_copyin_codegen.cpp fail on targets that have no TLS

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https://bugs.llvm.org/show_bug.cgi?id=40156

            Bug ID: 40156
           Summary: OpenMP/declare_reduction_codegen.cpp,
                    OpenMP/parallel_copyin_codegen.cpp fail on targets
                    that have no TLS
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: OpenMP
          Assignee: unassignedclangbugs at nondot.org
          Reporter: nicolasweber at gmx.de
                CC: llvm-bugs at lists.llvm.org

When LLVM_DEFAULT_TARGET_TRIPLE is set to a target that doesn't support TLS
(for example x86_64-apple-darwin instead of x86_64-apple-darwin16.7.0), then
OpenMP/declare_reduction_codegen.cpp and OpenMP/parallel_copyin_codegen.cpp
fail.

They check for the presence of 

; Function Attrs: noinline
define internal void @__cxx_global_var_init() #6 section
"__TEXT,__StaticInit,regular,pure_instructions" {
entry:
  call void @_ZN3SSSIiEC1Ev(%struct.SSS* @d)
  ret void
}

; Function Attrs: noinline nounwind optnone
define linkonce_odr void @_ZN3SSSIiEC1Ev(%struct.SSS* %this) unnamed_addr #0
align 2 {
entry:
  %this.addr = alloca %struct.SSS*, align 4
  store %struct.SSS* %this, %struct.SSS** %this.addr, align 4
  %this1 = load %struct.SSS*, %struct.SSS** %this.addr, align 4
  call void @_ZN3SSSIiEC2Ev(%struct.SSS* %this1)
  ret void
}


in this order, but without TLS these pieces get emitted a lot later, in
different order, and with a lot of code in between.



VarDecl::getTLSKind() contains

    if (!hasAttr<ThreadAttr>() &&
        !(getASTContext().getLangOpts().OpenMPUseTLS &&
          getASTContext().getTargetInfo().isTLSSupported() &&
          hasAttr<OMPThreadPrivateDeclAttr>()))
      return TLS_None;

and the two tests don't pass -fnoopenmp-use-tls. The probably should, to make
sure the expectations are independent of the default target triple.

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