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Add compilation hints for Cygwin 1.7 and remove the ones for 1.5

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Originally committed as revision 22567 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Víctor Paesa 2010-03-16 18:32:52 +00:00
parent 562f22a699
commit 2f821b036c
1 changed files with 10 additions and 23 deletions
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33
doc/general.texi
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@ -924,14 +924,13 @@ Then you can easily test FFmpeg with Wine
@subsection Compilation under Cygwin
The main issue with the 1.5.x Cygwin versions is that newlib, its C library,
does not contain llrint(). You need to upgrade to the unstable 1.7.x versions,
or leverage the implementation in MinGW (as explained below).
Please use Cygwin 1.7.x as the obsolete 1.5.x Cygwin versions lack
llrint() in its C library.
Just install your Cygwin with all the "Base" packages, plus the
Install your Cygwin with all the "Base" packages, plus the
following "Devel" ones:
@example
binutils, gcc-core, make, subversion, mingw-runtime
binutils, gcc4-core, make, subversion, mingw-runtime, texi2html
@end example
And the following "Utils" one:
@ -939,33 +938,21 @@ And the following "Utils" one:
diffutils
@end example
The experimental gcc4 package is still buggy, hence please
use the official gcc 3.4.4 or a 4.2.x compiled from source by yourself.
Install the current binutils-20080624-2 as they work fine (the old
binutils-20060709-1 proved buggy on shared builds).
Then create a small library that just contains llrint():
@example
ar x /usr/lib/mingw/libmingwex.a llrint.o
ar cq /usr/local/lib/libllrint.a llrint.o
@end example
Then run
@example
./configure --enable-static --disable-shared --extra-ldflags='-L /usr/local/lib' --extra-libs='-l llrint'
./configure --enable-static --disable-shared
@end example
to make a static build or
to make a static build.
The current @code{gcc4-core} package is buggy and needs this flag to build
shared libraries:
@example
./configure --enable-shared --disable-static --extra-ldflags='-L /usr/local/lib' --extra-libs='-l llrint'
./configure --enable-shared --disable-static --extra-cflags=-fno-reorder-functions
@end example
to build shared libraries.
If you want to build FFmpeg with additional libraries, download Cygwin
"Devel" packages for Ogg and Vorbis from any Cygwin packages repository:
@example