From 684753599afc76aa8f66c731bafb7204b39265b8 Mon Sep 17 00:00:00 2001
From: David Woodhouse <dwmw2@infradead.org>
Date: Sun, 18 Jun 2006 12:02:10 +0100
Subject: Basic implementation of 'make headers_check'

Based on the 'headers_install' target, this performs a basic sanity check
on the exported headers -- so far only checking that they do not include
any other headers which aren't selected for import, but easily extendable.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
---
 Makefile                     |  4 ++++
 scripts/Makefile.headersinst | 11 +++++++++++
 scripts/hdrcheck.sh          |  8 ++++++++
 3 files changed, 23 insertions(+)
 create mode 100755 scripts/hdrcheck.sh

diff --git a/Makefile b/Makefile
index 98e5af72983f..dbab1a9eabeb 100644
--- a/Makefile
+++ b/Makefile
@@ -866,6 +866,10 @@ headers_install: include/linux/version.h
 	$(Q)rm -rf $(INSTALL_HDR_PATH)/include
 	$(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.headersinst obj=include
 
+PHONY += headers_check
+headers_check: headers_install
+	$(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.headersinst obj=include HDRCHECK=1
+
 # ---------------------------------------------------------------------------
 # Modules
 
diff --git a/scripts/Makefile.headersinst b/scripts/Makefile.headersinst
index 688f8cb081d9..aa9990a3ccd6 100644
--- a/scripts/Makefile.headersinst
+++ b/scripts/Makefile.headersinst
@@ -78,6 +78,11 @@ quiet_cmd_unifdef	  = UNIFDEF $(_dst)/$@
       cmd_unifdef	  = $(UNIFDEF) $(srctree)/$(obj)/$@ | $(HDRSED)	\
                             > $(INSTALL_HDR_PATH)/$(_dst)/$@ || :
 
+quiet_cmd_check		  = CHECK   $(_dst)/$@
+      cmd_check		  = $(srctree)/scripts/hdrcheck.sh		\
+                              $(INSTALL_HDR_PATH)/include		\
+			      $(INSTALL_HDR_PATH)/$(_dst)/$@
+
 quiet_cmd_mkdir		  = MKDIR   $@
       cmd_mkdir		  = mkdir -p $(INSTALL_HDR_PATH)/$@
 
@@ -112,6 +117,11 @@ __headersinst: $(subdir-y) $(header-y) $(unifdef-y) $(altarch-y) $(objhdr-y)
 
 .PHONY: $(header-y) $(unifdef-y) $(subdir-y)
 
+ifdef HDRCHECK
+# Rules for checking headers
+$(objhdr-y) $(header-y) $(unifdef-y):
+	$(call cmd,check)
+else
 # Rules for installing headers
 
 $(objhdr-y) $(subdir-y) $(header-y) $(unifdef-y): $(_dst)
@@ -134,6 +144,7 @@ $(header-y):
 $(unifdef-y):
 	$(call cmd,unifdef)
 endif
+endif
 
 hdrinst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
 
diff --git a/scripts/hdrcheck.sh b/scripts/hdrcheck.sh
new file mode 100755
index 000000000000..b3bb683b56b6
--- /dev/null
+++ b/scripts/hdrcheck.sh
@@ -0,0 +1,8 @@
+#!/bin/sh
+
+for FILE in `grep '^#include <' $2 | cut -f2 -d\< | cut -f1 -d\> | egrep ^linux\|^asm` ; do
+    if [ ! -r $1/$FILE ]; then
+	echo $2 requires $FILE, which does not exist
+	exit 1
+    fi
+done
-- 
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