Why do I get the errors below when I use the /ENTRY option for the linker in a C++ project?

  • Thread starter Thread starter Belloc
  • Start date Start date
B

Belloc

Guest
Why do I get the errors below for the following simple code in C++?

#include<iostream>
struct A{ int i; A(): i(1){ std::cout << i << '\n'; } };

A a;

int main()
{
return 0;
}

Debug/x86 with linker options /SUBSYSTEM = Console (/SUBSYSTEM:CONSOLE) and /ENTRY = main

1>------ Build started: Project: CPP, Configuration: Debug Win32 ------
1>main.obj : error LNK2019: unresolved external symbol ___CxxFrameHandler3 referenced in function __unwindfunclet$??$?6U?$char_traits@D@std@@@std@@YAAAV?$basic_ostream@DU?$char_traits@D@std@@@0@AAV10@D@Z$2
1>MSVCRTD.lib(init.obj) : error LNK2019: unresolved external symbol __CrtDbgReport referenced in function __CRT_RTC_INIT
1>MSVCRTD.lib(init.obj) : error LNK2019: unresolved external symbol __CrtDbgReportW referenced in function __CRT_RTC_INITW
1>MSVCRTD.lib(error.obj) : error LNK2019: unresolved external symbol _strcpy_s referenced in function "void __cdecl _RTC_StackFailure(void *,char const *)" (?_RTC_StackFailure@@YAXPAXPBD@Z)
1>MSVCRTD.lib(error.obj) : error LNK2019: unresolved external symbol _strcat_s referenced in function "void __cdecl _RTC_StackFailure(void *,char const *)" (?_RTC_StackFailure@@YAXPAXPBD@Z)
1>MSVCRTD.lib(error.obj) : error LNK2019: unresolved external symbol ___stdio_common_vsprintf_s referenced in function __vsprintf_s_l
1>MSVCRTD.lib(pdblkup.obj) : error LNK2019: unresolved external symbol __wmakepath_s referenced in function "int __cdecl GetPdbDllPathFromFilePath(wchar_t const *,wchar_t *,unsigned int)" (?GetPdbDllPathFromFilePath@@YAHPB_WPA_WI@Z)
1>MSVCRTD.lib(pdblkup.obj) : error LNK2019: unresolved external symbol __wsplitpath_s referenced in function "int __cdecl GetPdbDllPathFromFilePath(wchar_t const *,wchar_t *,unsigned int)" (?GetPdbDllPathFromFilePath@@YAHPB_WPA_WI@Z)
1>MSVCRTD.lib(pdblkup.obj) : error LNK2019: unresolved external symbol _wcscpy_s referenced in function "int __cdecl GetPdbDllPathFromFilePath(wchar_t const *,wchar_t *,unsigned int)" (?GetPdbDllPathFromFilePath@@YAHPB_WPA_WI@Z)
1>MSVCRTD.lib(pdblkup.obj) : error LNK2019: unresolved external symbol ___vcrt_GetModuleFileNameW referenced in function "struct HINSTANCE__ * __cdecl GetPdbDll(void)" (?GetPdbDll@@YAPAUHINSTANCE__@@XZ)
1>MSVCRTD.lib(pdblkup.obj) : error LNK2019: unresolved external symbol ___vcrt_GetModuleHandleW referenced in function "struct HINSTANCE__ * __cdecl GetPdbDll(void)" (?GetPdbDll@@YAPAUHINSTANCE__@@XZ)
1>MSVCRTD.lib(pdblkup.obj) : error LNK2019: unresolved external symbol ___vcrt_LoadLibraryExW referenced in function "struct HINSTANCE__ * __cdecl GetPdbDll(void)" (?GetPdbDll@@YAPAUHINSTANCE__@@XZ)
1>MSVCRTD.lib(chandler4_noexcept.obj) : error LNK2019: unresolved external symbol _terminate referenced in function __except_handler4_noexcept
1>MSVCRTD.lib(chandler4gs.obj) : error LNK2019: unresolved external symbol __except_handler4_common referenced in function __except_handler4
1>C:\Users\jabel\Documents\Visual Studio 2017\Projects\Assemblies\Debug\CPP.exe : fatal error LNK1120: 14 unresolved externals
1>Done building project "CPP.vcxproj" -- FAILED.

Debug/x86 with linker options /SUBSYSTEM = Not set and /ENTRY = main

1>------ Build started: Project: CPP, Configuration: Debug Win32 ------
1>main.obj : error LNK2019: unresolved external symbol ___CxxFrameHandler3 referenced in function __unwindfunclet$??$?6U?$char_traits@D@std@@@std@@YAAAV?$basic_ostream@DU?$char_traits@D@std@@@0@AAV10@D@Z$2
1>MSVCRTD.lib(init.obj) : error LNK2019: unresolved external symbol __CrtDbgReport referenced in function __CRT_RTC_INIT
1>MSVCRTD.lib(init.obj) : error LNK2019: unresolved external symbol __CrtDbgReportW referenced in function __CRT_RTC_INITW
1>MSVCRTD.lib(error.obj) : error LNK2019: unresolved external symbol _strcpy_s referenced in function "void __cdecl _RTC_StackFailure(void *,char const *)" (?_RTC_StackFailure@@YAXPAXPBD@Z)
1>MSVCRTD.lib(error.obj) : error LNK2019: unresolved external symbol _strcat_s referenced in function "void __cdecl _RTC_StackFailure(void *,char const *)" (?_RTC_StackFailure@@YAXPAXPBD@Z)
1>MSVCRTD.lib(error.obj) : error LNK2019: unresolved external symbol ___stdio_common_vsprintf_s referenced in function __vsprintf_s_l
1>MSVCRTD.lib(pdblkup.obj) : error LNK2019: unresolved external symbol __wmakepath_s referenced in function "int __cdecl GetPdbDllPathFromFilePath(wchar_t const *,wchar_t *,unsigned int)" (?GetPdbDllPathFromFilePath@@YAHPB_WPA_WI@Z)
1>MSVCRTD.lib(pdblkup.obj) : error LNK2019: unresolved external symbol __wsplitpath_s referenced in function "int __cdecl GetPdbDllPathFromFilePath(wchar_t const *,wchar_t *,unsigned int)" (?GetPdbDllPathFromFilePath@@YAHPB_WPA_WI@Z)
1>MSVCRTD.lib(pdblkup.obj) : error LNK2019: unresolved external symbol _wcscpy_s referenced in function "int __cdecl GetPdbDllPathFromFilePath(wchar_t const *,wchar_t *,unsigned int)" (?GetPdbDllPathFromFilePath@@YAHPB_WPA_WI@Z)
1>MSVCRTD.lib(pdblkup.obj) : error LNK2019: unresolved external symbol ___vcrt_GetModuleFileNameW referenced in function "struct HINSTANCE__ * __cdecl GetPdbDll(void)" (?GetPdbDll@@YAPAUHINSTANCE__@@XZ)
1>MSVCRTD.lib(pdblkup.obj) : error LNK2019: unresolved external symbol ___vcrt_GetModuleHandleW referenced in function "struct HINSTANCE__ * __cdecl GetPdbDll(void)" (?GetPdbDll@@YAPAUHINSTANCE__@@XZ)
1>MSVCRTD.lib(pdblkup.obj) : error LNK2019: unresolved external symbol ___vcrt_LoadLibraryExW referenced in function "struct HINSTANCE__ * __cdecl GetPdbDll(void)" (?GetPdbDll@@YAPAUHINSTANCE__@@XZ)
1>MSVCRTD.lib(chandler4_noexcept.obj) : error LNK2019: unresolved external symbol _terminate referenced in function __except_handler4_noexcept
1>MSVCRTD.lib(chandler4gs.obj) : error LNK2019: unresolved external symbol __except_handler4_common referenced in function __except_handler4
1>C:\Users\jabel\Documents\Visual Studio 2017\Projects\Assemblies\Debug\CPP.exe : fatal error LNK1120: 14 unresolved externals
1>Done building project "CPP.vcxproj" -- FAILED.


Debug/x64 with linker options /SUBSYSTEM = Console (/SUBSYSTEM:CONSOLE) and /ENTRY = main

1>------ Build started: Project: CPP, Configuration: Debug x64 ------
1>main.obj : error LNK2001: unresolved external symbol __CxxFrameHandler3
1>MSVCRTD.lib(gshandlereh.obj) : error LNK2001: unresolved external symbol __CxxFrameHandler3
1>MSVCRTD.lib(init.obj) : error LNK2019: unresolved external symbol _CrtDbgReport referenced in function _CRT_RTC_INIT
1>MSVCRTD.lib(init.obj) : error LNK2019: unresolved external symbol _CrtDbgReportW referenced in function _CRT_RTC_INITW
1>MSVCRTD.lib(error.obj) : error LNK2019: unresolved external symbol strcpy_s referenced in function "void __cdecl _RTC_StackFailure(void *,char const *)" (?_RTC_StackFailure@@YAXPEAXPEBD@Z)
1>MSVCRTD.lib(error.obj) : error LNK2019: unresolved external symbol strcat_s referenced in function "void __cdecl _RTC_StackFailure(void *,char const *)" (?_RTC_StackFailure@@YAXPEAXPEBD@Z)
1>MSVCRTD.lib(error.obj) : error LNK2019: unresolved external symbol __stdio_common_vsprintf_s referenced in function _vsprintf_s_l
1>MSVCRTD.lib(error.obj) : error LNK2001: unresolved external symbol __C_specific_handler_noexcept
1>MSVCRTD.lib(pdblkup.obj) : error LNK2019: unresolved external symbol _wmakepath_s referenced in function "int __cdecl GetPdbDllPathFromFilePath(wchar_t const *,wchar_t *,unsigned __int64)" (?GetPdbDllPathFromFilePath@@YAHPEB_WPEA_W_K@Z)
1>MSVCRTD.lib(pdblkup.obj) : error LNK2019: unresolved external symbol _wsplitpath_s referenced in function "int __cdecl GetPdbDllPathFromFilePath(wchar_t const *,wchar_t *,unsigned __int64)" (?GetPdbDllPathFromFilePath@@YAHPEB_WPEA_W_K@Z)
1>MSVCRTD.lib(pdblkup.obj) : error LNK2019: unresolved external symbol wcscpy_s referenced in function "int __cdecl GetPdbDllPathFromFilePath(wchar_t const *,wchar_t *,unsigned __int64)" (?GetPdbDllPathFromFilePath@@YAHPEB_WPEA_W_K@Z)
1>MSVCRTD.lib(pdblkup.obj) : error LNK2019: unresolved external symbol __vcrt_GetModuleFileNameW referenced in function "struct HINSTANCE__ * __cdecl GetPdbDll(void)" (?GetPdbDll@@YAPEAUHINSTANCE__@@XZ)
1>MSVCRTD.lib(pdblkup.obj) : error LNK2019: unresolved external symbol __vcrt_GetModuleHandleW referenced in function "struct HINSTANCE__ * __cdecl GetPdbDll(void)" (?GetPdbDll@@YAPEAUHINSTANCE__@@XZ)
1>MSVCRTD.lib(pdblkup.obj) : error LNK2019: unresolved external symbol __vcrt_LoadLibraryExW referenced in function "struct HINSTANCE__ * __cdecl GetPdbDll(void)" (?GetPdbDll@@YAPEAUHINSTANCE__@@XZ)
1>C:\Users\jabel\Documents\Visual Studio 2017\Projects\Assemblies\x64\Debug\CPP.exe : fatal error LNK1120: 13 unresolved externals
1>Done building project "CPP.vcxproj" -- FAILED.


Debug/x64 with linker options /SUBSYSTEM = Not set and /ENTRY = main

1>main.obj : error LNK2001: unresolved external symbol __CxxFrameHandler3
1>MSVCRTD.lib(gshandlereh.obj) : error LNK2001: unresolved external symbol __CxxFrameHandler3
1>MSVCRTD.lib(init.obj) : error LNK2019: unresolved external symbol _CrtDbgReport referenced in function _CRT_RTC_INIT
1>MSVCRTD.lib(init.obj) : error LNK2019: unresolved external symbol _CrtDbgReportW referenced in function _CRT_RTC_INITW
1>MSVCRTD.lib(error.obj) : error LNK2019: unresolved external symbol strcpy_s referenced in function "void __cdecl _RTC_StackFailure(void *,char const *)" (?_RTC_StackFailure@@YAXPEAXPEBD@Z)
1>MSVCRTD.lib(error.obj) : error LNK2019: unresolved external symbol strcat_s referenced in function "void __cdecl _RTC_StackFailure(void *,char const *)" (?_RTC_StackFailure@@YAXPEAXPEBD@Z)
1>MSVCRTD.lib(error.obj) : error LNK2019: unresolved external symbol __stdio_common_vsprintf_s referenced in function _vsprintf_s_l
1>MSVCRTD.lib(error.obj) : error LNK2001: unresolved external symbol __C_specific_handler_noexcept
1>MSVCRTD.lib(pdblkup.obj) : error LNK2019: unresolved external symbol _wmakepath_s referenced in function "int __cdecl GetPdbDllPathFromFilePath(wchar_t const *,wchar_t *,unsigned __int64)" (?GetPdbDllPathFromFilePath@@YAHPEB_WPEA_W_K@Z)
1>MSVCRTD.lib(pdblkup.obj) : error LNK2019: unresolved external symbol _wsplitpath_s referenced in function "int __cdecl GetPdbDllPathFromFilePath(wchar_t const *,wchar_t *,unsigned __int64)" (?GetPdbDllPathFromFilePath@@YAHPEB_WPEA_W_K@Z)
1>MSVCRTD.lib(pdblkup.obj) : error LNK2019: unresolved external symbol wcscpy_s referenced in function "int __cdecl GetPdbDllPathFromFilePath(wchar_t const *,wchar_t *,unsigned __int64)" (?GetPdbDllPathFromFilePath@@YAHPEB_WPEA_W_K@Z)
1>MSVCRTD.lib(pdblkup.obj) : error LNK2019: unresolved external symbol __vcrt_GetModuleFileNameW referenced in function "struct HINSTANCE__ * __cdecl GetPdbDll(void)" (?GetPdbDll@@YAPEAUHINSTANCE__@@XZ)
1>MSVCRTD.lib(pdblkup.obj) : error LNK2019: unresolved external symbol __vcrt_GetModuleHandleW referenced in function "struct HINSTANCE__ * __cdecl GetPdbDll(void)" (?GetPdbDll@@YAPEAUHINSTANCE__@@XZ)
1>MSVCRTD.lib(pdblkup.obj) : error LNK2019: unresolved external symbol __vcrt_LoadLibraryExW referenced in function "struct HINSTANCE__ * __cdecl GetPdbDll(void)" (?GetPdbDll@@YAPEAUHINSTANCE__@@XZ)
1>C:\Users\jabel\Documents\Visual Studio 2017\Projects\Assemblies\x64\Debug\CPP.exe : fatal error LNK1120: 13 unresolved externals
1>Done building project "CPP.vcxproj" -- FAILED.


For the other combinations where the /ENTRY option is not specified the code compiles, links and executes normally for both x86 and x64. I have the feeling that this is a bug in VS2017 version 15.9.7, but I would appreciate some confirmation on this.

I know that the user doesn't need to specify the /ENTRY option in a C++ program, as the compiler already requires the name main for the function to be invoked by the C run-time library (see [basic.start] in the C++ standard). Nevertheless, I would say that the code should compile when the user provides a correct name for this /ENTRY option.

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