ghdl 0.21 is out

1 files changed, 16 insertions, 1 deletions

diff --git a/doc/ghdl.texi b/doc/ghdl.texi
index 5b20e50bd..c868a8c23 100644
--- a/doc/ghdl.texi
+++ b/doc/ghdl.texi
@@ -7,7 +7,7 @@
 @titlepage
 @title GHDL guide
 @subtitle GHDL, a VHDL compiler
-@subtitle For GHDL version 0.20 (Sokcho edition)
+@subtitle For GHDL version 0.21 (Sokcho edition)
 @author Tristan Gingold
 @c The following two commands start the copyright page.
 @page
@@ -846,6 +846,21 @@ declared in the @samp{ieee.VITAL_Timing} package.
 Currently, VITAL checks are only partially implemented.  @xref{VHDL
 restrictions for VITAL}, for more details.
 
+@item --syn-binding
+@cindex @option{--syn-binding} switch
+Use synthetizer rules for component binding.  During elaboration, if a
+component is not bound to an entity using VHDL LRM rules, try to find
+in any known library an entity whose name is the same as the component
+name.
+
+This rule is known as synthetizer rule.
+
+There are two key points: normal VHDL LRM rules are tried first and
+entities are search only in known library.  A known library is a
+library which has been named in your design.
+
+This option is only useful during elaboration.
+
 @item --GHDL1=@var{COMMAND}
 @cindex @option{--GHLD1} switch
 Use @var{COMMAND} as the command name for the compiler.  If @var{COMMAND} is