build: Add build flag to enable sparse checking of C source files

Similar to the 'make C=1' for the Linux kernel, wire up the sparse
command for our build system in a similar fashion. Use 'make C=1 [tool]'
to check the source files using sparse. Of course, the sparse tool needs
to be installed and available in your $PATH for this to work.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

1 files changed, 1 insertions, 0 deletions

diff --git a/INSTALL b/INSTALL
index 830f6a1..ee0a562 100644
--- a/INSTALL
+++ b/INSTALL
@@ -13,6 +13,7 @@ What additional tools next to your build-chain are required?
 
  - ccache (optional)
  - gpg (optional)
+ - sparse (optional)
 
  - pkg-config:		   all
  - flex, bison:		   bpfc, trafgen