Merge commit '33a7b453a8e1f090c694ea4f36769dc837be88f0'

* commit '33a7b453a8e1f090c694ea4f36769dc837be88f0':
  doc: mention option to mix shared/static libraries

Merged-by: Michael Niedermayer <michaelni@gmx.at>

doc/platform.texi

@@ -24,6 +24,17 @@ If not, then you should install a different compiler that has no
 hard-coded path to gas. In the worst case pass @code{--disable-asm}
 to configure.
 
+@section Advanced linking configuration
+
+If you compiled FFmpeg libraries statically and you want to use them to
+build your own shared library, you may need to force PIC support (with
+@code{--enable-pic} during FFmpeg configure) and add the following option
+to your project LDFLAGS:
+
+@example
+-Wl,-Bsymbolic
+@end example
+
 @section BSD
 
 BSD make will not build FFmpeg, you need to install and use GNU Make