doc/platform: Remove part about dllimport
[libav.git] / doc / platform.texi
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1\input texinfo @c -*- texinfo -*-
2
3@settitle Platform Specific information
4@titlepage
5@center @titlefont{Platform Specific information}
6@end titlepage
7
8@top
9
10@contents
11
12@chapter Unix-like
13
14Some parts of Libav cannot be built with version 2.15 of the GNU
15assembler which is still provided by a few AMD64 distributions. To
16make sure your compiler really uses the required version of gas
17after a binutils upgrade, run:
18
19@example
20$(gcc -print-prog-name=as) --version
21@end example
22
23If not, then you should install a different compiler that has no
24hard-coded path to gas. In the worst case pass @code{--disable-asm}
25to configure.
26
27@section BSD
28
29BSD make will not build Libav, you need to install and use GNU Make
90c9edba 30(@command{gmake}).
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31
32@section (Open)Solaris
33
90c9edba 34GNU Make is required to build Libav, so you have to invoke (@command{gmake}),
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35standard Solaris Make will not work. When building with a non-c99 front-end
36(gcc, generic suncc) add either @code{--extra-libs=/usr/lib/values-xpg6.o}
37or @code{--extra-libs=/usr/lib/64/values-xpg6.o} to the configure options
38since the libc is not c99-compliant by default. The probes performed by
39configure may raise an exception leading to the death of configure itself
40due to a bug in the system shell. Simply invoke a different shell such as
41bash directly to work around this:
42
43@example
44bash ./configure
45@end example
46
47@anchor{Darwin}
5ea20630 48@section Darwin (OS X, iPhone)
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49
50The toolchain provided with Xcode is sufficient to build the basic
51unacelerated code.
52
5ea20630 53OS X on PowerPC or ARM (iPhone) requires a preprocessor from
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54@url{http://github.com/yuvi/gas-preprocessor} to build the optimized
55assembler functions. Just download the Perl script and put it somewhere
56in your PATH, Libav's configure will pick it up automatically.
57
5ea20630 58OS X on AMD64 and x86 requires @command{yasm} to build most of the
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59optimized assembler functions @url{http://mxcl.github.com/homebrew/, Homebrew},
60@url{http://www.gentoo.org/proj/en/gentoo-alt/prefix/bootstrap-macos.xml, Gentoo Prefix}
61or @url{http://www.macports.org, MacPorts} can easily provide it.
62
63
64@chapter DOS
65
66Using a cross-compiler is preferred for various reasons.
67@url{http://www.delorie.com/howto/djgpp/linux-x-djgpp.html}
68
69
70@chapter OS/2
71
72For information about compiling Libav on OS/2 see
73@url{http://www.edm2.com/index.php/FFmpeg}.
74
75
76@chapter Windows
77
f45b5443 78@section Native Windows compilation using MinGW or MinGW-w64
1de6e14e 79
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80Libav can be built to run natively on Windows using the MinGW or MinGW-w64
81toolchains. Install the latest versions of MSYS and MinGW or MinGW-w64 from
82@url{http://www.mingw.org/} or @url{http://mingw-w64.sourceforge.net/}.
83You can find detailed installation instructions in the download section and
84the FAQ.
1de6e14e 85
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86Notes:
87
88@itemize
89
90@item Building natively using MSYS can be sped up by disabling implicit rules
91in the Makefile by calling @code{make -r} instead of plain @code{make}. This
92speed up is close to non-existent for normal one-off builds and is only
d19f3e9a 93noticeable when running make for a second time (for example during
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94@code{make install}).
95
96@item In order to compile AVplay, you must have the MinGW development library
d19f3e9a 97of @uref{http://www.libsdl.org/, SDL} and @code{pkg-config} installed.
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98
99@item By using @code{./configure --enable-shared} when configuring Libav,
d19f3e9a 100you can build all libraries as DLLs.
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101
102@end itemize
103
f45b5443 104@section Microsoft Visual C++
1de6e14e 105
f45b5443 106Libav can be built with MSVC using a C99-to-C89 conversion utility and
2d09b36c 107wrapper.
1de6e14e 108
f45b5443 109You will need the following prerequisites:
1de6e14e 110
f45b5443 111@itemize
c19e9d00 112@item @uref{https://github.com/libav/c99-to-c89/, C99-to-C89 Converter & Wrapper}
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113@item @uref{http://code.google.com/p/msinttypes/, msinttypes}
114@item @uref{http://www.mingw.org/, MSYS}
115@item @uref{http://yasm.tortall.net/, YASM}
116@item @uref{http://gnuwin32.sourceforge.net/packages/bc.htm, bc for Windows} if
117you want to run @uref{fate.html, FATE}.
118@end itemize
119
120To set up a proper MSVC environment in MSYS, you simply need to run
121@code{msys.bat} from the Visual Studio command prompt.
122
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123Place @code{makedef}, @code{c99wrap.exe}, @code{c99conv.exe}, and @code{yasm.exe}
124somewhere in your @code{PATH}.
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125
126Next, make sure @code{inttypes.h} and any other headers and libs you want to use
127are located in a spot that MSVC can see. Do so by modifying the @code{LIB} and
128@code{INCLUDE} environment variables to include the @strong{Windows} paths to
129these directories. Alternatively, you can try and use the
130@code{--extra-cflags}/@code{--extra-ldflags} configure options.
131
132Finally, run:
133
134@example
135./configure --toolchain=msvc
136make
137make install
138@end example
139
130cefc9 140If you wish to compile shared libraries, add @code{--enable-shared} to your
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141configure options. Note that due to the way MSVC handles DLL imports and
142exports, you cannot compile static and shared libraries at the same time, and
143enabling shared libraries will automatically disable the static ones.
144
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145Notes:
146
147@itemize
148
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149@item It is possible that coreutils' @code{link.exe} conflicts with MSVC's linker.
150You can find out by running @code{which link} to see which @code{link.exe} you
151are using. If it is located at @code{/bin/link.exe}, then you have the wrong one
152in your @code{PATH}. Either move or remove that copy, or make sure MSVC's
153@code{link.exe} takes precedence in your @code{PATH} over coreutils'.
154
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155@item If you wish to build with zlib support, you will have to grab a compatible
156zlib binary from somewhere, with an MSVC import lib, or if you wish to link
157statically, you can follow the instructions below to build a compatible
158@code{zlib.lib} with MSVC. Regardless of which method you use, you must still
159follow step 3, or compilation will fail.
160@enumerate
161@item Grab the @uref{http://zlib.net/, zlib sources}.
162@item Edit @code{win32/Makefile.msc} so that it uses -MT instead of -MD, since
163this is how Libav is built as well.
164@item Edit @code{zconf.h} and remove its inclusion of @code{unistd.h}. This gets
165erroneously included when building Libav.
166@item Run @code{nmake -f win32/Makefile.msc}.
167@item Move @code{zlib.lib}, @code{zconf.h}, and @code{zlib.h} to somewhere MSVC
168can see.
169@end enumerate
170
171@item Libav has been tested with Visual Studio 2010 and 2012, Pro and Express.
172Anything else is not officially supported.
173
174@end itemize
175
7d1d4469 176@subsection Linking to Libav with Microsoft Visual C++
f45b5443 177
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178If you plan to link with MSVC-built static libraries, you will need
179to make sure you have @code{Runtime Library} set to
180@code{Multi-threaded (/MT)} in your project's settings.
1de6e14e 181
f2f57d16 182You will need to define @code{inline} to something MSVC understands:
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183@example
184#define inline __inline
185@end example
186
187Also note, that as stated in @strong{Microsoft Visual C++}, you will need
188an MSVC-compatible @uref{http://code.google.com/p/msinttypes/, inttypes.h}.
189
190If you plan on using import libraries created by dlltool, you must
191set @code{References} to @code{No (/OPT:NOREF)} under the linker optimization
192settings, otherwise the resulting binaries will fail during runtime.
193This is not required when using import libraries generated by @code{lib.exe}.
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194This issue is reported upstream at
195@url{http://sourceware.org/bugzilla/show_bug.cgi?id=12633}.
196
197To create import libraries that work with the @code{/OPT:REF} option
198(which is enabled by default in Release mode), follow these steps:
199
200@enumerate
201
7d1d4469 202@item Open the @emph{Visual Studio Command Prompt}.
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203
204Alternatively, in a normal command line prompt, call @file{vcvars32.bat}
205which sets up the environment variables for the Visual C++ tools
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206(the standard location for this file is something like
207@file{C:\Program Files (x86_\Microsoft Visual Studio 10.0\VC\bin\vcvars32.bat}).
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208
209@item Enter the @file{bin} directory where the created LIB and DLL files
210are stored.
211
90c9edba 212@item Generate new import libraries with @command{lib.exe}:
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213
214@example
d19f3e9a 215lib /machine:i386 /def:..\lib\foo-version.def /out:foo.lib
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216@end example
217
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218Replace @code{foo-version} and @code{foo} with the respective library names.
219
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220@end enumerate
221
222@anchor{Cross compilation for Windows with Linux}
223@section Cross compilation for Windows with Linux
224
225You must use the MinGW cross compilation tools available at
226@url{http://www.mingw.org/}.
227
228Then configure Libav with the following options:
229@example
230./configure --target-os=mingw32 --cross-prefix=i386-mingw32msvc-
231@end example
232(you can change the cross-prefix according to the prefix chosen for the
233MinGW tools).
234
235Then you can easily test Libav with @uref{http://www.winehq.com/, Wine}.
236
237@section Compilation under Cygwin
238
239Please use Cygwin 1.7.x as the obsolete 1.5.x Cygwin versions lack
240llrint() in its C library.
241
242Install your Cygwin with all the "Base" packages, plus the
243following "Devel" ones:
244@example
245binutils, gcc4-core, make, git, mingw-runtime, texi2html
246@end example
247
578344f7 248In order to run FATE you will also need the following "Utils" packages:
1de6e14e 249@example
578344f7 250bc, diffutils
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251@end example
252
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253If you want to build Libav with additional libraries, download Cygwin
254"Devel" packages for Ogg and Vorbis from any Cygwin packages repository:
255@example
256libogg-devel, libvorbis-devel
257@end example
258
259These library packages are only available from
260@uref{http://sourceware.org/cygwinports/, Cygwin Ports}:
261
262@example
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263yasm, libSDL-devel, libfaac-devel, libgsm-devel, libmp3lame-devel,
264libschroedinger1.0-devel, speex-devel, libtheora-devel, libxvidcore-devel
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265@end example
266
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267The recommendation for x264 is to build it from source, as it evolves too
268quickly for Cygwin Ports to be up to date.
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269
270@section Crosscompilation for Windows under Cygwin
271
272With Cygwin you can create Windows binaries that do not need the cygwin1.dll.
273
274Just install your Cygwin as explained before, plus these additional
275"Devel" packages:
276@example
277gcc-mingw-core, mingw-runtime, mingw-zlib
278@end example
279
280and add some special flags to your configure invocation.
281
282For a static build run
283@example
284./configure --target-os=mingw32 --extra-cflags=-mno-cygwin --extra-libs=-mno-cygwin
285@end example
286
287and for a build with shared libraries
288@example
289./configure --target-os=mingw32 --enable-shared --disable-static --extra-cflags=-mno-cygwin --extra-libs=-mno-cygwin
290@end example
291
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292@chapter Plan 9
293
294The native @uref{http://plan9.bell-labs.com/plan9/, Plan 9} compiler
295does not implement all the C99 features needed by Libav so the gcc
296port must be used. Furthermore, a few items missing from the C
297library and shell environment need to be fixed.
298
299@itemize
300
301@item GNU awk, grep, make, and sed
302
303Working packages of these tools can be found at
304@uref{http://code.google.com/p/ports2plan9/downloads/list, ports2plan9}.
305They can be installed with @uref{http://9front.org/, 9front's} @code{pkg}
306utility by setting @code{pkgpath} to
307@code{http://ports2plan9.googlecode.com/files/}.
308
309@item Missing/broken @code{head} and @code{printf} commands
310
311Replacements adequate for building Libav can be found in the
312@code{compat/plan9} directory. Place these somewhere they will be
313found by the shell. These are not full implementations of the
314commands and are @emph{not} suitable for general use.
315
316@item Missing C99 @code{stdint.h} and @code{inttypes.h}
317
318Replacement headers are available from
319@url{http://code.google.com/p/plan9front/issues/detail?id=152}.
320
321@item Missing or non-standard library functions
322
323Some functions in the C library are missing or incomplete. The
324@code{@uref{http://ports2plan9.googlecode.com/files/gcc-apelibs-1207.tbz,
325gcc-apelibs-1207}} package from
326@uref{http://code.google.com/p/ports2plan9/downloads/list, ports2plan9}
327includes an updated C library, but installing the full package gives
328unusable executables. Instead, keep the files from @code{gccbin.tgz}
329under @code{/386/lib/gnu}. From the @code{libc.a} archive in the
330@code{gcc-apelibs-1207} package, extract the following object files and
331turn them into a library:
332
333@itemize
334@item @code{strerror.o}
335@item @code{strtoll.o}
336@item @code{snprintf.o}
337@item @code{vsnprintf.o}
338@item @code{vfprintf.o}
339@item @code{_IO_getc.o}
340@item @code{_IO_putc.o}
341@end itemize
342
343Use the @code{--extra-libs} option of @code{configure} to inform the
344build system of this library.
345
346@item FPU exceptions enabled by default
347
348Unlike most other systems, Plan 9 enables FPU exceptions by default.
349These must be disabled before calling any Libav functions. While the
350included tools will do this automatically, other users of the
351libraries must do it themselves.
352
353@end itemize
354
1de6e14e 355@bye