[FFmpeg-trac] #2049(build system:new): msvc: --extra-cflags="-MD" leads to unresolved externals

[FFmpeg]

#2049: msvc: --extra-cflags="-MD" leads to unresolved externals
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             Reporter:  Piroxiljin   |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  build
              Version:  git-master   |  system
             Keywords:  msvc         |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by Piroxiljin):

 Replying to [comment:1 cehoyos]:
 > Why do you want to add -MD to the compiler flags?
 I use ffmpeg libraries, and my application and all other libraries are
 linked with DLL run-time library.

 MSDN: /MD, /MT, /LD (Use Run-Time Library) (http://msdn.microsoft.com/en-
 us/library/2kzt1wy3(v=vs.100).aspx)
   -MD Causes your application to use the multithread- and DLL-specific
 version of the run-time library.
   -MT Causes your application to use the multithread, static version of
 the run-time library.

 Also, I found out that prefix {{{__imp__}}} appears when object-file
 compiles with -MD. In another way (without -MD, or with -MT) all
 unresolved symbols has another prefix.(I'm not sure, but I belive it just
 underscore. I'll check it tomorrow. ) And those object-files (and static
 libavutils.a) successfully linked with ffmpeg.exe

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2049#comment:2>
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