# using pvrtc lib **URL:** \ **Category:** PowerVR Insider\ **Created:** [January 5, 2011, 6:52pm UTC](https://forums.imgtec.com/t/using-pvrtc-lib/962 "2011-01-05T18:52:48Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![deep](https://avatars.discourse-cdn.com/v4/letter/d/ce7236/32.png) [@deep](https://forums.imgtec.com/u/deep)\ **Post date:** [January 5, 2011, 6:52pm UTC](https://forums.imgtec.com/t/using-pvrtc-lib/962/1 "2011-01-05T18:52:48Z")
I’m trying to use the pvrtc texture compression library.  When I use the DLL version (UtilitiesPVRTCdll) everything compiles and works correctly, however, I’d like to avoid the external dependency.  When I try to link w/ the lib version (UtilitiesPVRTClib), however, I get the following errors:  1\>LIBCMTD.lib(dbgheap.obj) : error LNK2005: \_\_malloc\_dbg already defined in MSVCRTD.lib(MSVCR90D.dll) 1\>LIBCMTD.lib(dbgheap.obj) : error LNK2005: \_\_free\_dbg already defined in MSVCRTD.lib(MSVCR90D.dll) 1\>LIBCMTD.lib(dbgheap.obj) : error LNK2005: \_\_CrtSetCheckCount already defined in MSVCRTD.lib(MSVCR90D.dll) 1\>LIBCMTD.lib(crt0dat.obj) : error LNK2005: \_exit already defined in MSVCRTD.lib(MSVCR90D.dll) 1\>LIBCMTD.lib(crt0dat.obj) : error LNK2005: \_\_amsg\_exit already defined in MSVCRTD.lib(MSVCR90D.dll) 1\>LIBCMTD.lib(crt0dat.obj) : error LNK2005: \_\_initterm\_e already defined in MSVCRTD.lib(MSVCR90D.dll) 1\>LIBCMTD.lib(fflush.obj) : error LNK2005: \_fflush already defined in MSVCRTD.lib(MSVCR90D.dll) 1\>LIBCMTD.lib(dbghook.obj) : error LNK2005: \_\_crt\_debugger\_hook already defined in MSVCRTD.lib(MSVCR90D.dll) 1\>LIBCMTD.lib(tidtable.obj) : error LNK2005: \_\_encode\_pointer already defined in MSVCRTD.lib(MSVCR90D.dll) 1\>LIBCMTD.lib(tidtable.obj) : error LNK2005: \_\_encoded\_null already defined in MSVCRTD.lib(MSVCR90D.dll) 1\>LIBCMTD.lib(tidtable.obj) : error LNK2005: \_\_decode\_pointer already defined in MSVCRTD.lib(MSVCR90D.dll) 1\>LIBCMTD.lib(sprintf.obj) : error LNK2005: \_sprintf already defined in MSVCRTD.lib(MSVCR90D.dll) 1\>LIBCMTD.lib(invarg.obj) : error LNK2005: \_\_invalid\_parameter already defined in MSVCRTD.lib(MSVCR90D.dll) 1\>LIBCMTD.lib(crt0init.obj) : error LNK2005: \_\_\_xi\_a already defined in MSVCRTD.lib(cinitexe.obj) 1\>LIBCMTD.lib(crt0init.obj) : error LNK2005: \_\_\_xi\_z already defined in MSVCRTD.lib(cinitexe.obj) 1\>LIBCMTD.lib(crt0init.obj) : error LNK2005: \_\_\_xc\_a already defined in MSVCRTD.lib(cinitexe.obj) 1\>LIBCMTD.lib(crt0init.obj) : error LNK2005: \_\_\_xc\_z already defined in MSVCRTD.lib(cinitexe.obj) 1\>LIBCMTD.lib(hooks.obj) : error LNK2005: “void \_\_cdecl terminate(void)” (?terminate@@YAXXZ) already defined in MSVCRTD.lib(MSVCR90D.dll) 1\>LIBCMTD.lib(winxfltr.obj) : error LNK2005: \_\_\_CppXcptFilter already defined in MSVCRTD.lib(MSVCR90D.dll) 1\>LIBCMTD.lib(mlock.obj) : error LNK2005: \_\_lock already defined in MSVCRTD.lib(MSVCR90D.dll) 1\>LIBCMTD.lib(mlock.obj) : error LNK2005: \_\_unlock already defined in MSVCRTD.lib(MSVCR90D.dll) 1\>LIBCMTD.lib(vsprintf.obj) : error LNK2005: \_vsprintf already defined in MSVCRTD.lib(MSVCR90D.dll) 1\>LIBCMTD.lib(\_ctype.obj) : error LNK2005: \_isspace already defined in MSVCRTD.lib(MSVCR90D.dll) 1\>LIBCMTD.lib(dbgrptw.obj) : error LNK2005: \_\_CrtDbgReportW already defined in MSVCRTD.lib(MSVCR90D.dll) 1\>LIBCMTD.lib(printf.obj) : error LNK2005: \_printf already defined in MSVCRTD.lib(MSVCR90D.dll) 1\>LIBCMTD.lib(getenv.obj) : error LNK2005: \_getenv already defined in MSVCRTD.lib(MSVCR90D.dll) 1\>LIBCMTD.lib(tolower.obj) : error LNK2005: \_tolower already defined in MSVCRTD.lib(MSVCR90D.dll) 1\>LIBCMTD.lib(vprintf.obj) : error LNK2005: \_vprintf already defined in MSVCRTD.lib(MSVCR90D.dll) I tried to ignore libcmtd.lib, but then I get the following errors instead: 1\>pvrtc.lib(tools.obj) : error LNK2019: unresolved external symbol \_\_iob referenced in function \_printf\_flush 1\>pvrtc.lib(bitmap.obj) : error LNK2001: unresolved external symbol \_\_iob 1\>pvrtc.lib(amtc.obj) : error LNK2001: unresolved external symbol \_\_iob I’m guessing these errors are a result of mixing debug and release libraries or libraries compiled w/ another version of Visual Studio.  I’m trying to build a debug version of my application, which uses the Multi-threaded Debug DLL, using Visual Studio 2008. Can someone provide some details about what options were used to create the lib version of pvrtc?  Assuming there is an incompatibility, is it possible to get a new library built w/ VS 2008? Is dll version of pvrtc built w/ the same compiler options as the lib version?  I’m a little confused as to why the dll version works while the lib version doesn’t. ---
**Author:** ![forestierul](https://avatars.discourse-cdn.com/v4/letter/f/46a35a/32.png) [@forestierul](https://forums.imgtec.com/u/forestierul)\ **Post date:** [January 5, 2011, 11:33pm UTC](https://forums.imgtec.com/t/using-pvrtc-lib/962/2 "2011-01-05T23:33:13Z")
This happens because you try to link with a runtime different than the pvrtc lib. In MSVC, in project options under C/C++ -\> Code Generation -\> Runtime Library. Try all the values until it works 🙂 ---
**Author:** ![deep](https://avatars.discourse-cdn.com/v4/letter/d/ce7236/32.png) [@deep](https://forums.imgtec.com/u/deep)\ **Post date:** [January 6, 2011, 8:45pm UTC](https://forums.imgtec.com/t/using-pvrtc-lib/962/3 "2011-01-06T20:45:03Z")
While that may be informative, I’m working w/ a very large code base that links w/ other 3rd components, so changing the version of the C runtime I use is not an option. While I understand the desire to not expose the source to the pvrtc library, if you’re going to do that you should ship the SDK w/ several (documented) versions of the library in an effort to  maximize the potential that the library could actually be used. Is it possible to get another build of this library?