[SCM] libav/experimental: Leverage MinGW's llrint() in Cygwin compilations.
siretart at users.alioth.debian.org
siretart at users.alioth.debian.org
Sun Jun 30 16:08:50 UTC 2013
The following commit has been merged in the experimental branch:
commit 29c3d42b422ed1b538665341079e322a3b9488df
Author: Víctor Paesa <victorpaesa at googlemail.com>
Date: Tue Oct 30 20:07:31 2007 +0000
Leverage MinGW's llrint() in Cygwin compilations.
Originally committed as revision 10878 to svn://svn.ffmpeg.org/ffmpeg/trunk
diff --git a/doc/general.texi b/doc/general.texi
index 978c34e..5f94d4c 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -530,27 +530,36 @@ Then you can easily test FFmpeg with Wine
@subsection Compilation under Cygwin
-Cygwin works very much like Unix.
+The main issue with Cygwin is that newlib, its C library, does not
+contain llrint(). However, it is possible to leverage the
+implementation in MinGW.
Just install your Cygwin with all the "Base" packages, plus the
following "Devel" ones:
@example
-binutils, gcc-core, make, subversion
+binutils, gcc-core, make, subversion, mingw-runtime
@end example
Do not install binutils-20060709-1 (they are buggy on shared builds);
use binutils-20050610-1 instead.
+Then create a small library that just contains llrint():
+
+ at example
+ar x /usr/lib/mingw/libmingwex.a llrint.o
+ar cq /usr/local/lib/libllrint.a llrint.o
+ at end example
+
Then run
@example
-./configure --enable-static --disable-shared
+./configure --enable-static --disable-shared --extra-ldflags='-L /usr/local/lib' --extra-libs='-l llrint'
@end example
to make a static build or
@example
-./configure --enable-shared --disable-static
+./configure --enable-shared --disable-static --extra-ldflags='-L /usr/local/lib' --extra-libs='-l llrint'
@end example
to build shared libraries.
--
Libav/FFmpeg packaging
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