doc/platform: Rework the Visual Studio linking section
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
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@ -167,54 +167,33 @@ Anything else is not officially supported.
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@end itemize
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@subsection Using shared libraries built with MinGW in Visual Studio
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@subsection Linking to Libav with Microsoft Visual C++
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Currently, if you want to build shared libraries on Windows, you need to
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use MinGW.
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This is how to create DLL and LIB files that are compatible with MSVC++:
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Within the MSYS shell, build Libav with
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@example
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./configure --enable-shared
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make
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make install
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@end example
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Your install path (@file{/usr/local/} by default) should now have the
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necessary DLL and LIB files under the @file{bin} directory.
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Alternatively, build the libraries with a cross compiler, according to
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the instructions below in @ref{Cross compilation for Windows with Linux}.
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To use those files with MSVC++, do the same as you would do with
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the static libraries, as described above. But in Step 4,
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you should only need to add the directory where the LIB files are installed
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(i.e. @file{c:\msys\usr\local\bin}). This is not a typo, the LIB files are
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installed in the @file{bin} directory. And instead of adding the static
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libraries (@file{libxxx.a} files) you should add the MSVC import libraries
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(@file{avcodec.lib}, @file{avformat.lib}, and
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@file{avutil.lib}). Note that you should not use the GCC import
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libraries (@file{libxxx.dll.a} files), as these will give you undefined
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reference errors. There should be no need for @file{libmingwex.a},
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@file{libgcc.a}, and @file{wsock32.lib}, nor any other external library
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statically linked into the DLLs.
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If you plan to link with MSVC-built static libraries, you will need
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to make sure you have @code{Runtime Library} set to
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@code{Multi-threaded (/MT)} in your project's settings.
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Libav headers do not declare global data for Windows DLLs through the usual
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dllexport/dllimport interface. Such data will be exported properly while
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building, but to use them in your MSVC++ code you will have to edit the
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building, but to use them in your MSVC code you will have to edit the
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appropriate headers and mark the data as dllimport. For example, in
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libavutil/pixdesc.h you should have:
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@example
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extern __declspec(dllimport) const AVPixFmtDescriptor av_pix_fmt_descriptors[];
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@end example
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Note that using import libraries created by dlltool requires
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the linker optimization option to be set to
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"References: Keep Unreferenced Data (@code{/OPT:NOREF})", otherwise
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the resulting binaries will fail during runtime. This isn't
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required when using import libraries generated by lib.exe.
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You will also need to define @code{inline} to something MSVC understands:
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@example
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#define inline __inline
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@end example
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Also note, that as stated in @strong{Microsoft Visual C++}, you will need
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an MSVC-compatible @uref{http://code.google.com/p/msinttypes/, inttypes.h}.
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If you plan on using import libraries created by dlltool, you must
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set @code{References} to @code{No (/OPT:NOREF)} under the linker optimization
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settings, otherwise the resulting binaries will fail during runtime.
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This is not required when using import libraries generated by @code{lib.exe}.
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This issue is reported upstream at
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@url{http://sourceware.org/bugzilla/show_bug.cgi?id=12633}.
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@ -223,12 +202,12 @@ To create import libraries that work with the @code{/OPT:REF} option
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@enumerate
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@item Open @emph{Visual Studio 2005 Command Prompt}.
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@item Open the @emph{Visual Studio Command Prompt}.
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Alternatively, in a normal command line prompt, call @file{vcvars32.bat}
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which sets up the environment variables for the Visual C++ tools
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(the standard location for this file is
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@file{C:\Program Files\Microsoft Visual Studio 8\VC\bin\vcvars32.bat}).
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(the standard location for this file is something like
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@file{C:\Program Files (x86_\Microsoft Visual Studio 10.0\VC\bin\vcvars32.bat}).
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@item Enter the @file{bin} directory where the created LIB and DLL files
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are stored.
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