[Bug 412647]

[Andoni Morales]

There are several reasons why we decided to build the SDK against the
system CRT msvcrt.dll, but the most important one is that if you decide
to link against any of the VS ones you will be forced to distribute
broken software.

According to MS EULA you can't distribute yourself this "system library"
(eg: msvcr100.dll) so your software is depending on a third party
installer (Microsoft Visual C++ 20XX Redistributable Package). The GPL
also forbids explicitely the redistribution of System Libraries
(http://www.gnu.org/licenses/gpl-faq.en.html#WindowsRuntimeAndGPL).

How is this handled in Firefox?

There is the option of rebuilding the SDK linking against msvcr100.dll,
this would require on our side providing a gcc spec that links against
moldnames100 and msvcr100 and rebuilding gcc so that libgcc_s_sjlj-1.dll
and libstdc++6.dll are linked against the new CRT and using the gcc spec
in the toolchain.

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Title:
  Firefox is not able to play mp4 <video> tags

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