add an optional config option for stripping all unnecessary symbol exports from the...

[openwrt/svn-archive/archive.git] / include / kernel-build.mk

diff --git a/include/kernel-build.mk b/include/kernel-build.mk
index 678cf18a3d4a85a190912c0808dc89d103ab4a42..e3e446ba584c17abb6e7d713fc22b413a28d873d 100644 (file)
--- a/include/kernel-build.mk
+++ b/include/kernel-build.mk
@@ -7,14 +7,11 @@
 include $(INCLUDE_DIR)/host.mk
 include $(INCLUDE_DIR)/prereq.mk
 
-ifneq ($(DUMP),1)
-  override MAKEFLAGS=
-endif
-
 ifneq ($(DUMP),1)
   all: compile
 endif
 
+export QUILT=1
 STAMP_PREPARED:=$(LINUX_DIR)/.prepared
 STAMP_CONFIGURED:=$(LINUX_DIR)/.configured
 include $(INCLUDE_DIR)/download.mk
@@ -57,6 +54,28 @@ define BuildKernel
        $(Kernel/Prepare)
        touch $$@
 
+  $(KERNEL_BUILD_DIR)/symtab.txt: FORCE
+       find $(LINUX_DIR) $(STAGING_DIR_ROOT)/lib/modules -name \*.ko | \
+               xargs $(TARGET_CROSS)nm | \
+               awk '$$$$1 == "U" { print $$$$2 } ' | \
+               sort -u > $$@
+
+  $(KERNEL_BUILD_DIR)/symtab.h: $(KERNEL_BUILD_DIR)/symtab.txt
+       ( \
+               echo '#define SYMTAB_KEEP \'; \
+               cat $(KERNEL_BUILD_DIR)/symtab.txt | \
+                       awk '{print "*(__ksymtab." $$$$1 ") \\" }'; \
+               echo; \
+               echo '#define SYMTAB_KEEP_GPL \'; \
+               cat $(KERNEL_BUILD_DIR)/symtab.txt | \
+                       awk '{print "*(__ksymtab_gpl." $$$$1 ") \\" }'; \
+               echo; \
+               echo '#define SYMTAB_KEEP_STR \'; \
+               cat $(KERNEL_BUILD_DIR)/symtab.txt | \
+                       awk '{print "*(__ksymtab_strings." $$$$1 ") \\" }'; \
+               echo; \
+       ) > $$@
+
   $(STAMP_CONFIGURED): $(STAMP_PREPARED) $(LINUX_CONFIG) $(GENERIC_LINUX_CONFIG) $(TOPDIR)/.config
        $(Kernel/Configure)
        touch $$@
@@ -65,7 +84,7 @@ define BuildKernel
        $(Kernel/CompileModules)
        touch $$@
 
-  $(LINUX_DIR)/.image: $(STAMP_CONFIGURED) FORCE
+  $(LINUX_DIR)/.image: $(STAMP_CONFIGURED) $(if $(CONFIG_STRIP_KERNEL_EXPORTS),$(KERNEL_BUILD_DIR)/symtab.h) FORCE
        $(Kernel/CompileImage)
        touch $$@
        
@@ -80,27 +99,22 @@ define BuildKernel
   compile: $(LINUX_DIR)/.modules
        $(MAKE) -C image compile TARGET_BUILD=
 
-  oldconfig menuconfig: $(STAMP_PREPARED) FORCE
+  oldconfig menuconfig: $(STAMP_PREPARED) $(STAMP_CHECKED) FORCE
+       [ -e "$(LINUX_CONFIG)" ] || touch "$(LINUX_CONFIG)"
        $(LINUX_CONFCMD) > $(LINUX_DIR)/.config
-       $(MAKE) -C $(LINUX_DIR) $(KERNEL_MAKEOPTS) $$@
-       $(SCRIPT_DIR)/kconfig.pl '>' $(GENERIC_LINUX_CONFIG) $(LINUX_DIR)/.config > $(LINUX_CONFIG)
+       touch $(LINUX_CONFIG)
+       $(_SINGLE)$(MAKE) -C $(LINUX_DIR) $(KERNEL_MAKEOPTS) $$@
+       $(SCRIPT_DIR)/kconfig.pl '>' $(GENERIC_LINUX_CONFIG) $(LINUX_DIR)/.config > $(if $(LINUX_SUBCONFIG),$(LINUX_SUBCONFIG),$(LINUX_CONFIG))
        $(Kernel/Configure)
 
   install: $(LINUX_DIR)/.image
-       TARGET_BUILD="" $(MAKE) -C image compile install
+       +$(MAKE) -C image compile install TARGET_BUILD=
 
   clean: FORCE
        rm -rf $(KERNEL_BUILD_DIR)
 
-  rebuild: FORCE
-       @$(MAKE) mostlyclean
-       @if [ -f $(LINUX_KERNEL) ]; then \
-               $(MAKE) clean; \
-       fi
-       @$(MAKE) compile
-
   image-prereq:
-       $(SUBMAKE) -s -C image prereq TARGET_BUILD=
+       @+$(NO_TRACE_MAKE) -s -C image prereq TARGET_BUILD=
 
   prereq: image-prereq