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>

1 files changed, 11 insertions, 0 deletions

diff --git a/scripts/Makefile.headersinst b/scripts/Makefile.headersinst
index 688f8cb081..aa9990a3cc 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