今天在移植一個開源代碼到windows的VC6工程，編譯時出現了這些奇怪的LINK錯誤。

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msvcrt.lib(MSVCRT.dll) : error LNK2005: _toupper already defined in LIBCD.lib(toupper.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _tolower already defined in LIBCD.lib(tolower.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _isupper already defined in LIBCD.lib(_ctype.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _isalpha already defined in LIBCD.lib(_ctype.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _free already defined in LIBCD.lib(dbgheap.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _realloc already defined in LIBCD.lib(dbgheap.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _atol already defined in LIBCD.lib(atox.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _malloc already defined in LIBCD.lib(dbgheap.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _wcslen already defined in LIBCD.lib(wcslen.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: __strdup already defined in LIBCD.lib(strdup.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _memmove already defined in LIBCD.lib(memmove.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _strrchr already defined in LIBCD.lib(strrchr.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _isspace already defined in LIBCD.lib(_ctype.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _strchr already defined in LIBCD.lib(strchr.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _isalnum already defined in LIBCD.lib(_ctype.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _isdigit already defined in LIBCD.lib(_ctype.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _isxdigit already defined in LIBCD.lib(_ctype.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _strncmp already defined in LIBCD.lib(strncmp.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _localeconv already defined in LIBCD.lib(lconv.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _sprintf already defined in LIBCD.lib(sprintf.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _exit already defined in LIBCD.lib(crt0dat.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _floor already defined in LIBCD.lib(floor.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: __stricmp already defined in LIBCD.lib(stricmp.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _getenv already defined in LIBCD.lib(getenv.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _atoi already defined in LIBCD.lib(atox.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _atof already defined in LIBCD.lib(atof.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _fclose already defined in LIBCD.lib(fclose.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _strcspn already defined in LIBCD.lib(strcspn.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _fwrite already defined in LIBCD.lib(fwrite.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _fputc already defined in LIBCD.lib(fputc.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _strtol already defined in LIBCD.lib(strtol.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _strncpy already defined in LIBCD.lib(strncpy.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: __isctype already defined in LIBCD.lib(isctype.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: __strnicmp already defined in LIBCD.lib(strnicmp.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _strstr already defined in LIBCD.lib(strstr.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _isprint already defined in LIBCD.lib(_ctype.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _strtod already defined in LIBCD.lib(strtod.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _fopen already defined in LIBCD.lib(fopen.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _fflush already defined in LIBCD.lib(fflush.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _calloc already defined in LIBCD.lib(dbgheap.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _abort already defined in LIBCD.lib(abort.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _islower already defined in LIBCD.lib(_ctype.obj)

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從提示來看，msvcrt.lib(MSVCRT.dll)和LIBCD.lib中存在符號沖突！

導致鏈接器在鏈接時發現一個符號在兩處有定義，就不知道該鏈接那個了，從而報出LNK2005的鏈接錯誤。

在工程設置中勾上"Force?file output"即可強制生成dll或exe文件。

?

關于這個選項的更多說明請參考：http://msdn.microsoft.com/en-us/library/70abkas3.aspx

轉載于:https://www.cnblogs.com/kekec/archive/2011/11/18/2253879.html

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