今天在编译vc工程时出现的错误，并在网上找到了解决方法，有类似问题的请参照
本人在编译VC6.0工程时，遇到如下错误：
MSVCRTD.lib(MSVCRTD.dll) : error LNK2005: _getenv already defined in LIBCMTD.lib(getenv.obj)
MSVCRTD.lib(MSVCRTD.dll) : error LNK2005: _free already defined in LIBCMTD.lib(dbgheap.obj)
MSVCRTD.lib(MSVCRTD.dll) : error LNK2005: _calloc already defined in LIBCMTD.lib(dbgheap.obj)
MSVCRTD.lib(MSVCRTD.dll) : error LNK2005: _malloc already defined in LIBCMTD.lib(dbgheap.obj)
MSVCRTD.lib(MSVCRTD.dll) : error LNK2005: _printf already defined in xlibgui.lib(PRINTF.OBJ)
MSVCRTD.lib(MSVCRTD.dll) : error LNK2005: _fflush already defined in LIBCMTD.lib(fflush.obj)
MSVCRTD.lib(MSVCRTD.dll) : error LNK2005: _sprintf already defined in LIBCMTD.lib(sprintf.obj)
MSVCRTD.lib(MSVCRTD.dll) : error LNK2005: _strncpy already defined in LIBCMTD.lib(strncpy.obj)
MSVCRTD.lib(MSVCRTD.dll) : error LNK2005: _atoi already defined in LIBCMTD.lib(atox.obj)
MSVCRTD.lib(MSVCRTD.dll) : error LNK2005: _realloc already defined in LIBCMTD.lib(dbgheap.obj)
MSVCRTD.lib(MSVCRTD.dll) : error LNK2005: _signal already defined in LIBCMTD.lib(winsig.obj)
MSVCRTD.lib(MSVCRTD.dll) : error LNK2005: __controlfp already defined in LIBCMTD.lib(ieee87.obj)
MSVCRTD.lib(MSVCRTD.dll) : error LNK2005: _exit already defined in LIBCMTD.lib(crt0dat.obj)
MSVCRTD.lib(MSVCRTD.dll) : warning LNK4006: _getenv already defined in LIBCMTD.lib(getenv.obj); second definition ignored
MSVCRTD.lib(MSVCRTD.dll) : warning LNK4006: _free already defined in LIBCMTD.lib(dbgheap.obj); second definition ignored
MSVCRTD.lib(MSVCRTD.dll) : warning LNK4006: _calloc already defined in LIBCMTD.lib(dbgheap.obj); second definition ignored
MSVCRTD.lib(MSVCRTD.dll) : warning LNK4006: _malloc already defined in LIBCMTD.lib(dbgheap.obj); second definition ignored
MSVCRTD.lib(MSVCRTD.dll) : warning LNK4006: _printf already defined in xlibgui.lib(PRINTF.OBJ); second definition ignored
MSVCRTD.lib(MSVCRTD.dll) : warning LNK4006: _fflush already defined in LIBCMTD.lib(fflush.obj); second definition ignored
MSVCRTD.lib(MSVCRTD.dll) : warning LNK4006: _sprintf already defined in LIBCMTD.lib(sprintf.obj); second definition ignored
MSVCRTD.lib(MSVCRTD.dll) : warning LNK4006: _strncpy already defined in LIBCMTD.lib(strncpy.obj); second definition ignored
MSVCRTD.lib(MSVCRTD.dll) : warning LNK4006: _atoi already defined in LIBCMTD.lib(atox.obj); second definition ignored
MSVCRTD.lib(MSVCRTD.dll) : warning LNK4006: _realloc already defined in LIBCMTD.lib(dbgheap.obj); second definition ignored
MSVCRTD.lib(MSVCRTD.dll) : warning LNK4006: _signal already defined in LIBCMTD.lib(winsig.obj); second definition ignored
MSVCRTD.lib(MSVCRTD.dll) : warning LNK4006: __controlfp already defined in LIBCMTD.lib(ieee87.obj); second definition ignored
MSVCRTD.lib(MSVCRTD.dll) : warning LNK4006: _exit already defined in LIBCMTD.lib(crt0dat.obj); second definition ignored
MSVCRTD.lib(MSVCRTD.dll) : warning LNK4006: _fclose already defined in LIBCMTD.lib(fclose.obj); second definition ignored
MSVCRTD.lib(MSVCRTD.dll) : warning LNK4006: _fopen already defined in LIBCMTD.lib(fopen.obj); second definition ignored
MSVCRTD.lib(MSVCRTD.dll) : warning LNK4006: __stricmp already defined in LIBCMTD.lib(stricmp.obj); second definition ignored
MSVCRTD.lib(MSVCRTD.dll) : warning LNK4006: _fprintf already defined in LIBCMTD.lib(fprintf.obj); second definition ignored
MSVCRTD.lib(MSVCRTD.dll) : warning LNK4006: _ceil already defined in LIBCMTD.lib(ceil.obj); second definition ignored
Creating library Debug/shm_ext_sim.lib and object Debug/shm_ext_sim.exp
LINK : warning LNK4098: defaultlib "MSVCRTD" conflicts with use of other libs; use /NODEFAULTLIB:library
LINK : warning LNK4098: defaultlib "MSVCRT" conflicts with use of other libs; use /NODEFAULTLIB:library
Debug/shm_ext_sim.exe : fatal error LNK1169: one or more multiply defined symbols found
Error executing link.exe.
shm_ext_sim.exe - 37 error(s), 86 warning(s)
原因及解决方法：
主程序和lib所使用的运行库不一致，project->setting-> Generation->Use MFC Static Library
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| For example, if you received this warning and you want to create an executable file that uses the non-debug, single-threaded version of the run-time libraries, you could use the following options with the linker:
/NODEFAULTLIB:libcmt.lib /NODEFAULTLIB:msvcrt.lib /NODEFAULTLIB:libcd.lib /NODEFAULTLIB:libcmtd.lib /NODEFAULTLIB:msvcrtd.lib
或者这样：For example, if you received this warning and you want to create an executable file that uses the non-debug, single-threaded version of the run-time libraries, you could use the following options with the linker:
/NODEFAULTLIB:libcmt.lib /NODEFAULTLIB:msvcrt.lib /NODEFAULTLIB:libcd.lib /NODEFAULTLIB:libcmtd.lib /NODEFAULTLIB写程序看到 warning，感觉不爽。 这个警告在 link option 中 加入 对应的 /NODEFAULTLIB:xxx.lib 就ok了
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