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vdcommon.h: add comment about OLDMSVCRT

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Uri Lublin 2014-11-05 10:20:30 -05:00
parent dd53b1766e
commit a6383f29dc
1 changed files with 17 additions and 0 deletions
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17
common/vdcommon.h
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@ -43,6 +43,23 @@ typedef CRITICAL_SECTION mutex_t;
#define ALIGN_VC __declspec (align(1))
#endif
/*
* Note: OLDMSVCRT, which is defined (in the Makefile) for mingw builds, and
* is not defined for Visual Studio builds.
*
* On Windows XP some those functions are missing from the msvcrt.dll
* When compiled with mingw, the program fails to run due to missing functions.
* One can link to a newer runtime dll, e.g. msvcr100.dll, but that would
* require installing that DLL on the guest. That can be done by downloading
* and installing Microsoft Visual C++ 2010 Redistributable Package.
* (same for 110.dll and 2012 Redistributable Package, etc).
*
* Since we do not want to add this dependency, we use functions that are
* available in msvcrt.dll (and use define in the code).
*
* Currently Visual Studio builds are built with /MT (static mode) such that
* those functions are not required to be in that dll on the guest.
*/
#ifdef OLDMSVCRT
#define swprintf_s(buf, sz, format...) swprintf(buf, format)
#endif