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

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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doc/general.texi
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@ -924,14 +924,13 @@ Then you can easily test FFmpeg with Wine
@subsection Compilation under Cygwin @subsection Compilation under Cygwin
The main issue with the 1.5.x Cygwin versions is that newlib, its C library, Please use Cygwin 1.7.x as the obsolete 1.5.x Cygwin versions lack
does not contain llrint(). You need to upgrade to the unstable 1.7.x versions, llrint() in its C library.
or leverage the implementation in MinGW (as explained below).
Just install your Cygwin with all the "Base" packages, plus the Install your Cygwin with all the "Base" packages, plus the
following "Devel" ones: following "Devel" ones:
@example @example
binutils, gcc-core, make, subversion, mingw-runtime binutils, gcc4-core, make, subversion, mingw-runtime, texi2html
@end example @end example
And the following "Utils" one: And the following "Utils" one:
@ -939,33 +938,21 @@ And the following "Utils" one:
diffutils diffutils
@end example @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 Then run
@example @example
./configure --enable-static --disable-shared --extra-ldflags='-L /usr/local/lib' --extra-libs='-l llrint' ./configure --enable-static --disable-shared
@end example @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 @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 @end example
to build shared libraries.
If you want to build FFmpeg with additional libraries, download Cygwin If you want to build FFmpeg with additional libraries, download Cygwin
"Devel" packages for Ogg and Vorbis from any Cygwin packages repository: "Devel" packages for Ogg and Vorbis from any Cygwin packages repository:
@example @example