[FFmpeg-cvslog] r10878 - trunk/doc/general.texi

victor subversion
Tue Oct 30 21:07:32 CET 2007

Author: victor
Date: Tue Oct 30 21:07:31 2007
New Revision: 10878

Leverage MinGW's llrint() in Cygwin compilations.


Modified: trunk/doc/general.texi
--- trunk/doc/general.texi	(original)
+++ trunk/doc/general.texi	Tue Oct 30 21:07:31 2007
@@ -530,27 +530,36 @@ Then you can easily test FFmpeg with Win
 @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:
-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
-./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
-./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.

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