Coccinelle: Add support to the SPFLAGS variable

The SPFLAGS variable allows to pass additional options
to spatch, e.g. -use_glimpse.
Signed-off-by: NNicolas Palix <nicolas.palix@imag.fr>
Signed-off-by: NMichal Marek <mmarek@suse.cz>

Documentation/coccinelle.txt

@@ -114,7 +114,7 @@ To apply Coccinelle to a specific directory, M= can be used.
 For example, to check drivers/net/wireless/ one may write:
 
     make coccicheck M=drivers/net/wireless/
-    
+
 To apply Coccinelle on a file basis, instead of a directory basis, the
 following command may be used:
 
@@ -134,6 +134,15 @@ MODE variable explained above.
 In this mode, there is no information about semantic patches
 displayed, and no commit message proposed.
 
+ Additional flags
+~~~~~~~~~~~~~~~~~~
+
+Additional flags can be passed to spatch through the SPFLAGS
+variable.
+
+    make SPFLAGS=--use_glimpse coccicheck
+
+See spatch --help to learn more about spatch options.
 
  Proposing new semantic patches
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

scripts/coccicheck

@@ -11,7 +11,7 @@ else
 	VERBOSE=0
 fi
 
-FLAGS="-very_quiet"
+FLAGS="$SPFLAGS -very_quiet"
 
 # spatch only allows include directories with the syntax "-I include"
 # while gcc also allows "-Iinclude" and "-include include"