From 4ab64933e3372ef0ad759fc7eae95713f9afd817 Mon Sep 17 00:00:00 2001
From: Kim Phillips <kim.phillips@freescale.com>
Date: Fri, 21 Sep 2012 12:28:17 +0000
Subject: add check infrastructure, default sparse

Add support for running source code checkers on u-boot source, e.g.,
using sparse to aid with typechecking.  This comes in especially
handy as SoC vendors mix and match cores and devices with different
endianness, thus here we add CHECK_ENDIAN to the otherwise linux
kernel default CHECKFLAGS.

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
---
 Makefile  | 18 ++++++++++++++++++
 config.mk |  8 ++++++++
 2 files changed, 26 insertions(+)

diff --git a/Makefile b/Makefile
index 09456e090a..7802a0fec8 100644
--- a/Makefile
+++ b/Makefile
@@ -92,6 +92,24 @@ BUILD_DIR := $(O)
 endif
 endif
 
+# Call a source code checker (by default, "sparse") as part of the
+# C compilation.
+#
+# Use 'make C=1' to enable checking of re-compiled files.
+#
+# See the linux kernel file "Documentation/sparse.txt" for more details,
+# including where to get the "sparse" utility.
+
+ifdef C
+ifeq ("$(origin C)", "command line")
+CHECKSRC := $(C)
+endif
+endif
+ifndef CHECKSRC
+  CHECKSRC = 0
+endif
+export CHECKSRC
+
 ifneq ($(BUILD_DIR),)
 saved-output := $(BUILD_DIR)
 
diff --git a/config.mk b/config.mk
index 51b47838cf..bb5c69a15d 100644
--- a/config.mk
+++ b/config.mk
@@ -149,6 +149,7 @@ OBJCOPY = $(CROSS_COMPILE)objcopy
 OBJDUMP = $(CROSS_COMPILE)objdump
 RANLIB	= $(CROSS_COMPILE)RANLIB
 DTC	= dtc
+CHECK	= sparse
 
 #########################################################################
 
@@ -275,6 +276,10 @@ ifneq ($(CONFIG_SPL_TEXT_BASE),)
 LDFLAGS_u-boot-spl += -Ttext $(CONFIG_SPL_TEXT_BASE)
 endif
 
+# Linus' kernel sanity checking tool
+CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
+                  -Wbitwise -Wno-return-void -D__CHECK_ENDIAN__ $(CF)
+
 # Location of a usable BFD library, where we define "usable" as
 # "built for ${HOST}, supports ${TARGET}".  Sensible values are
 # - When cross-compiling: the root of the cross-environment
@@ -322,6 +327,9 @@ $(obj)%.s:	%.S
 $(obj)%.o:	%.S
 	$(CC)  $(ALL_AFLAGS) -o $@ $< -c
 $(obj)%.o:	%.c
+ifneq ($(CHECKSRC),0)
+	$(CHECK) $(CHECKFLAGS) $(ALL_CFLAGS) $<
+endif
 	$(CC)  $(ALL_CFLAGS) -o $@ $< -c
 $(obj)%.i:	%.c
 	$(CPP) $(ALL_CFLAGS) -o $@ $< -c
-- 
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