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정성태 (techsharer at outlook.com)
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Visual C++ - error LNK2001: unresolved external symbol _CrtDbgReport
x64 + Debug 빌드로 잘 되던 것을, "Configuration Properties" / "C/C++" / "Code Generation" - "Runtime Library" == "Multi-threaded (/MT)" 설정으로 바꾸면 다음과 같은 링크 오류가 발생합니다.
1>libcpmtd.lib(xlocale.obj) : error LNK2001: unresolved external symbol _CrtDbgReport
1>ConsoleApplication1.obj : error LNK2001: unresolved external symbol _CrtDbgReport
1>libcpmtd.lib(cout.obj) : error LNK2001: unresolved external symbol _CrtDbgReport
1>libcpmtd.lib(locale.obj) : error LNK2001: unresolved external symbol _CrtDbgReport
1>libcpmtd.lib(wlocale.obj) : error LNK2001: unresolved external symbol _CrtDbgReport
1>libcpmtd.lib(wlocale.obj) : error LNK2001: unresolved external symbol _free_dbg
1>libcpmtd.lib(xlocale.obj) : error LNK2001: unresolved external symbol _free_dbg
1>libcpmtd.lib(xwcsxfrm.obj) : error LNK2001: unresolved external symbol _free_dbg
1>libcpmtd.lib(StlCompareStringA.obj) : error LNK2001: unresolved external symbol _free_dbg
1>libcpmtd.lib(cout.obj) : error LNK2001: unresolved external symbol _free_dbg
1>libcpmtd.lib(locale0.obj) : error LNK2001: unresolved external symbol _free_dbg
1>libcpmtd.lib(locale.obj) : error LNK2001: unresolved external symbol _free_dbg
1>libcpmtd.lib(StlLCMapStringA.obj) : error LNK2001: unresolved external symbol _free_dbg
1>libcpmtd.lib(wlocale.obj) : error LNK2001: unresolved external symbol _malloc_dbg
1>libcpmtd.lib(xlocale.obj) : error LNK2001: unresolved external symbol _malloc_dbg
1>libcpmtd.lib(xwcsxfrm.obj) : error LNK2001: unresolved external symbol _malloc_dbg
1>libcpmtd.lib(StlCompareStringA.obj) : error LNK2001: unresolved external symbol _malloc_dbg
1>libcpmtd.lib(cout.obj) : error LNK2001: unresolved external symbol _malloc_dbg
1>libcpmtd.lib(locale0.obj) : error LNK2001: unresolved external symbol _malloc_dbg
1>libcpmtd.lib(locale.obj) : error LNK2001: unresolved external symbol _malloc_dbg
1>libcpmtd.lib(StlLCMapStringA.obj) : error LNK2001: unresolved external symbol _malloc_dbg
1>libcpmtd.lib(_tolower.obj) : error LNK2019: unresolved external symbol _calloc_dbg referenced in function _Getctype
1>libcpmtd.lib(locale.obj) : error LNK2001: unresolved external symbol _calloc_dbg
1>libcpmtd.lib(wlocale.obj) : error LNK2001: unresolved external symbol _calloc_dbg
1>libcpmtd.lib(xlocale.obj) : error LNK2001: unresolved external symbol _calloc_dbg
1>libcpmtd.lib(_tolower.obj) : error LNK2019: unresolved external symbol _wcsdup_dbg referenced in function _Getctype
1>libcpmtd.lib(xstrcoll.obj) : error LNK2001: unresolved external symbol _wcsdup_dbg
1>libcpmtd.lib(locale.obj) : error LNK2019: unresolved external symbol _realloc_dbg referenced in function "private: static void __cdecl std::locale::_Locimp::_Locimp_Addfac(class std::locale::_Locimp *,class std::locale::facet *,unsigned __int64)" (?_Locimp_Addfac@_Locimp@locale@std@@CAXPEAV123@PEAVfacet@23@_K@Z)
1>libcpmtd.lib(StlLCMapStringA.obj) : error LNK2019: unresolved external symbol _CrtDbgReportW referenced in function _freea_crt
1>libcpmtd.lib(xmbtowc.obj) : error LNK2001: unresolved external symbol _CrtDbgReportW
1>libcpmtd.lib(StlCompareStringA.obj) : error LNK2001: unresolved external symbol _CrtDbgReportW
1>E:\temp\debug_release\ConsoleApplication1\x64\Debug\ConsoleApplication1.exe : fatal error LNK1120: 7 unresolved externals
물론 다시 "/MTd"로 바꾸면 괜찮겠지만 /MT 상태에서 위의 오류를 벗어나려면 "Configuration Properties" / "C/C++" / "Preprocessor" - "Preprocessor Definitions" 설정에서 "_DEBUG" 상수 정의를 빼면 됩니다.
(참고로, x86 + Debug 빌드에서는 "Multi-threaded (/MT)"로 바꿔도 오류가 발생하지 않습니다.)
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