[LLVMbugs] [Bug 23472] New: missing comdats for static initializers in template and guard variables

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23472

            Bug ID: 23472
           Summary: missing comdats for static initializers in template
                    and guard variables
           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: dschuff at google.com, geek4civic at gmail.com,
                    llvmbugs at cs.uiuc.edu, rnk at google.com
    Classification: Unclassified

Created attachment 14307
  --> https://llvm.org/bugs/attachment.cgi?id=14307&action=edit
header

compiling the attached sources on Windows x64 using

 clang++ l1.cpp l2.cpp -target i686-pc-windows-gnu

results in

 multiple definition of `guard variable for
lanczos_initializer<int>::initializer'

where as g++ is ok:

 g++ l1.cpp l2.cpp

the object files shows comdats with g++ but not with clang:

 >g++ l1.cpp -c & nm l1.o
00000000 b .bss
00000000 d .ctors
00000000 d .data
00000000 d .data$_ZGVN19lanczos_initializerIiE11initializerE
00000000 d .data$_ZN19lanczos_initializerIiE11initializerE
00000000 r .eh_frame
00000000 r .eh_frame$_ZN4initC1Ev
00000000 r .rdata$zzz
00000000 t .text
00000000 t .text$_ZN4initC1Ev
00000037 t __GLOBAL__sub_I__Z2l1v
00000000 T __Z2l1v
00000005 t __Z41__static_initialization_and_destruction_0ii
00000000 D __ZGVN19lanczos_initializerIiE11initializerE
00000000 D __ZN19lanczos_initializerIiE11initializerE
00000000 T __ZN4initC1Ev


 >clang++ l1.cpp -c -target i686-pc-windows-gnu & nm l1.o
00000000 b .bss
00000000 b .bss
00000000 b .bss
00000000 d .ctors
00000000 d .data
00000000 d .eh_frame
00000000 t .text
00000000 t .text
00000000 t .text
00000001 a @feat.00
00000000 t ___cxx_global_var_init
00000000 T __Z2l1v
00000000 B __ZGVN19lanczos_initializerIiE11initializerE
00000000 B __ZN19lanczos_initializerIiE11initializerE
00000000 T __ZN4initC2Ev

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