document split-by-reloc and split-by-file

ld/ld.1

@@ -82,6 +82,10 @@ ld \- the GNU linker
 .RB "[\|" \-S "\|]" 
 .RB "[\|" \-s "\|]" 
 .RB "[\|" \-sort\-common "\|]" 
+.RB "[\|" \-split\-by\-reloc\ "\c
+.I count\c
+\&\|]
+.RB "[\|" \-split\-by\-file "\|]" 
 .RB "[\|" "\-T\ "\c
 .I commandfile\c
 \&\|]  
@@ -700,6 +704,28 @@ the two bytes, then all the four bytes, and then everything else.
 This is to prevent gaps between symbols due to
 alignment constraints.  This option disables that sorting.
 
+.TP
+.B \-split\-by\-reloc\ \fIcount
+Trys to creates extra sections in the output file so that no single
+output section in the file contains more than
+.I count
+relocations.
+This is useful when generating huge relocatable for downloading into
+certain real time kernels with the COFF object file format; since COFF
+cannot represent more than 65535 relocations in a single section.
+Note that this will fail to work with object file formats which do not
+support arbitrary sections.  The linker will not split up individual
+input sections for redistribution, so if a single input section
+contains more than
+.I count
+relocations one output section will contain that many relocations.
+
+.TP
+.B \-split\-by\-file
+Similar to
+.B \-split\-by\-reloc
+but creates a new output section for each input file.
+
 .TP
 .BI "\-Tbss " "org"\c
 .TP