kbuild: make V=2 tell why a target is rebuild

[net-next-2.6.git] / Makefile

diff --git a/Makefile b/Makefile
index edfc2fdf76c9542a7bbc66516d09f65511463f59..440a1331d883143a48563ec8b212811e8e51c285 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -736,6 +736,7 @@ endif # ifdef CONFIG_KALLSYMS
 # vmlinux image - including updated kernel symbols
 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
        $(call if_changed_rule,vmlinux__)
+       $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
        $(Q)rm -f .old_version
 
 # The actual objects are generated when descending, 
@@ -893,8 +894,8 @@ INSTALL_HDR_PATH=$(objtree)/usr
 export INSTALL_HDR_PATH
 
 PHONY += headers_install
-headers_install: include/linux/version.h
-       $(Q)unifdef -Ux /dev/null
+headers_install: include/linux/version.h scripts_basic FORCE
+       $(Q)$(MAKE) $(build)=scripts scripts/unifdef
        $(Q)rm -rf $(INSTALL_HDR_PATH)/include
        $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.headersinst obj=include
 
@@ -1100,6 +1101,7 @@ help:
                echo '')
 
        @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
+       @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
        @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
        @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
        @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'