[llvm-bugs] [Bug 46351] New: std::stringstream generates vtable

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46351

            Bug ID: 46351
           Summary: std::stringstream generates vtable
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: dave at znu.io
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

The following code generates vtables whereas GNU C++ does not:

#include <sstream>

std::string example(void *pointer) {
        std::stringstream result;
        result << "example";
        return result.str();
}

This is both surprising and unfortunate. Here are the exported symbols on my
Linux box:

0000000000000000 W __clang_call_terminate
                 U __cxa_begin_catch
                 U __cxa_end_catch
0000000000000000 r GCC_except_table0
000000000000001c r GCC_except_table13
0000000000000034 r GCC_except_table15
0000000000000078 r GCC_except_table16
                 U __gxx_personality_v0
                 U memset
                 U _Unwind_Resume
0000000000000000 T _Z7examplePv
                 U _ZdlPv
0000000000000000 W
_ZNKSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEE3strEv
                 U
_ZNKSt3__121__basic_string_commonILb1EE20__throw_length_errorEv
                 U _ZNKSt3__16locale9use_facetERNS0_2idE
                 U _ZNKSt3__18ios_base6getlocEv
                 U
_ZNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE6resizeEmc
                 U
_ZNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE9push_backEc
                 U _ZNSt3__113basic_istreamIcNS_11char_traitsIcEEED0Ev
                 U _ZNSt3__113basic_istreamIcNS_11char_traitsIcEEED1Ev
                 U
_ZNSt3__113basic_ostreamIcNS_11char_traitsIcEEE6sentryC1ERS3_
                 U _ZNSt3__113basic_ostreamIcNS_11char_traitsIcEEE6sentryD1Ev
                 U _ZNSt3__113basic_ostreamIcNS_11char_traitsIcEEED0Ev
                 U _ZNSt3__113basic_ostreamIcNS_11char_traitsIcEEED1Ev
                 U _ZNSt3__114basic_iostreamIcNS_11char_traitsIcEEED0Ev
                 U _ZNSt3__114basic_iostreamIcNS_11char_traitsIcEEED1Ev
                 U _ZNSt3__114basic_iostreamIcNS_11char_traitsIcEEED2Ev
                 U _ZNSt3__115basic_streambufIcNS_11char_traitsIcEEE4syncEv
                 U
_ZNSt3__115basic_streambufIcNS_11char_traitsIcEEE5imbueERKNS_6localeE
                 U _ZNSt3__115basic_streambufIcNS_11char_traitsIcEEE5uflowEv
                 U _ZNSt3__115basic_streambufIcNS_11char_traitsIcEEE6setbufEPcl
                 U _ZNSt3__115basic_streambufIcNS_11char_traitsIcEEE6xsgetnEPcl
                 U
_ZNSt3__115basic_streambufIcNS_11char_traitsIcEEE6xsputnEPKcl
                 U
_ZNSt3__115basic_streambufIcNS_11char_traitsIcEEE9showmanycEv
                 U _ZNSt3__115basic_streambufIcNS_11char_traitsIcEEEC2Ev
                 U _ZNSt3__115basic_streambufIcNS_11char_traitsIcEEED2Ev
0000000000000000 W
_ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEE7seekoffExNS_8ios_base7seekdirEj
0000000000000000 W
_ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEE7seekposENS_4fposI11__mbstate_tEEj
0000000000000000 W
_ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEE8overflowEi
0000000000000000 W
_ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEE9pbackfailEi
0000000000000000 W
_ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEE9underflowEv
0000000000000000 W
_ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEED0Ev
0000000000000000 W
_ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEED2Ev
0000000000000000 W
_ZNSt3__116__pad_and_outputIcNS_11char_traitsIcEEEENS_19ostreambuf_iteratorIT_T0_EES6_PKS4_S8_S8_RNS_8ios_baseES4_
0000000000000000 W
_ZNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEED0Ev
0000000000000000 W
_ZNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEED1Ev
0000000000000000 W
_ZNSt3__124__put_character_sequenceIcNS_11char_traitsIcEEEERNS_13basic_ostreamIT_T0_EES7_PKS4_m
                 U _ZNSt3__15ctypeIcE2idE
                 U _ZNSt3__16localeD1Ev
                 U _ZNSt3__18ios_base33__set_badbit_and_consider_rethrowEv
                 U _ZNSt3__18ios_base4initEPv
                 U _ZNSt3__18ios_base5clearEj
                 U _ZNSt3__19basic_iosIcNS_11char_traitsIcEEED2Ev
                 U _Znwm
                 U _ZSt9terminatev
0000000000000000 V
_ZTCNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE0_NS_13basic_istreamIcS2_EE
0000000000000000 V
_ZTCNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE0_NS_14basic_iostreamIcS2_EE
0000000000000000 V
_ZTCNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE16_NS_13basic_ostreamIcS2_EE
                 U _ZThn16_NSt3__114basic_iostreamIcNS_11char_traitsIcEEED0Ev
                 U _ZThn16_NSt3__114basic_iostreamIcNS_11char_traitsIcEEED1Ev
0000000000000000 W
_ZThn16_NSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEED0Ev
0000000000000000 W
_ZThn16_NSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEED1Ev
0000000000000000 V
_ZTTNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
                 U _ZTv0_n24_NSt3__113basic_istreamIcNS_11char_traitsIcEEED0Ev
                 U _ZTv0_n24_NSt3__113basic_istreamIcNS_11char_traitsIcEEED1Ev
                 U _ZTv0_n24_NSt3__113basic_ostreamIcNS_11char_traitsIcEEED0Ev
                 U _ZTv0_n24_NSt3__113basic_ostreamIcNS_11char_traitsIcEEED1Ev
                 U _ZTv0_n24_NSt3__114basic_iostreamIcNS_11char_traitsIcEEED0Ev
                 U _ZTv0_n24_NSt3__114basic_iostreamIcNS_11char_traitsIcEEED1Ev
0000000000000000 W
_ZTv0_n24_NSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEED0Ev
0000000000000000 W
_ZTv0_n24_NSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEED1Ev
0000000000000000 V
_ZTVNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEEE
0000000000000000 V
_ZTVNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE

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