[LLVMbugs] [Bug 9593] New: static dtors are invoked unconditionally with -fno-use-cxa-atexit

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Wed Mar 30 23:18:19 PDT 2011


           Summary: static dtors are invoked unconditionally with
           Product: clang
           Version: 2.9
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: geek4civic at gmail.com
                CC: llvmbugs at cs.uiuc.edu
            Blocks: 8390

Created an attachment (id=6383)
 --> (http://llvm.org/bugs/attachment.cgi?id=6383)
foo.s generated by clang -fno-use-cxa-atexit

// testcase
extern "C" void ctor();
extern "C" void dtor();

class FOO {
  FOO()  {ctor();}
  ~FOO() {dtor();}

FOO* get() {
  static FOO instance;
  return &instance;

$ clang++ -cc1 -fno-use-cxa-atexit -O3 -Wall foo.cc -S -emit-llvm -o foo.ll


define %class.FOO* @_Z3getv() nounwind {
  (check and set guard variable for get()::instance)


@llvm.global_dtors = appending global [1 x %0] [%0 { i32 65535, void ()*
@_GLOBAL__D_a }]


define internal void @_GLOBAL__D_a() nounwind {
  tail call void @dtor() nounwind
  ret void


Cygming is affected by this issue.
FYI, with g++-4.4 on cygming, atexit(tcf_xxx) is used instead of cxa_atexit.

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