ocaml#5995: document -for-pack as mandatory including in bytecode. Th…

…is is required to get proper names for exceptions.

man/ocamlc.m

@@ -313,10 +313,15 @@ standard search path (the one corresponding to the
 .BR ocamlrun (1)
 can find it and use it.
 .TP
-.BI \-for\-pack \ ident
-This option is accepted for compatibility with
-.BR ocamlopt (1)
-; it does nothing.
+.BI \-for\-pack \ module\-path
+Generate an object file (.cmx and .o files) that can later be included
+as a sub-module (with the given access path) of a compilation unit
+constructed with
+.BR \-pack .
+For instance,
+.B ocamlc\ \-for\-pack\ P\ \-c\ A.ml
+will generate a.cmo that can later be used with
+.BR "ocamlc -pack -o P.cmo a.cmo" .
 .TP
 .B \-g
 Add debugging information while compiling and linking. This option is

manual/manual/cmds/comp.etex

@@ -199,9 +199,13 @@ The "-dllpath" option simply stores \var{dir} in the produced
 executable file, where "ocamlrun" can find it and use it as
 described in section~\ref{s-ocamlrun-dllpath}.
 
-\item["-for-pack" \var{ident}]
-This option is accepted for compatibility with "ocamlopt"; it does
-nothing.
+\item["-for-pack" \var{module-path}]
+Generate an object file (".cmo") that can later be
+included
+as a sub-module (with the given access path) of a compilation unit
+constructed with "-pack".  For instance, "ocamlc -for-pack P -c A.ml"
+will generate "a.cmo" that can later be used with
+"ocamlc -pack -o P.cmo a.cmo".
 
 \item["-g"]
 Add debugging information while compiling and linking. This option is