build: speed up kernel symbol export stripping

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

diff --git a/include/kernel-build.mk b/include/kernel-build.mk
index cf8737c..d343658 100644 (file)
--- a/include/kernel-build.mk
+++ b/include/kernel-build.mk
@@ -32,6 +32,7 @@ endef
 
 define Kernel/CompileImage
        $(call Kernel/CompileImage/Default)
+       $(call Kernel/CompileImage/Initramfs)
 endef
 
 define Kernel/Clean
@@ -67,25 +68,33 @@ define BuildKernel
        $(Kernel/Prepare)
        touch $$@
 
-  $(KERNEL_BUILD_DIR)/symtab.txt: FORCE
+  $(KERNEL_BUILD_DIR)/symtab.h: FORCE
+       rm -f $(KERNEL_BUILD_DIR)/symtab.h
+       touch $(KERNEL_BUILD_DIR)/symtab.h
+       +$(MAKE) $(KERNEL_MAKEOPTS) vmlinux
        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
+               sort -u > $(KERNEL_BUILD_DIR)/mod_symtab.txt
+       $(TARGET_CROSS)nm -n $(LINUX_DIR)/vmlinux.o | grep -F ' r __ksymtab' | sed -e 's,........ r __ksymtab_,,' > $(KERNEL_BUILD_DIR)/kernel_symtab.txt
+       grep -Ff $(KERNEL_BUILD_DIR)/mod_symtab.txt $(KERNEL_BUILD_DIR)/kernel_symtab.txt > $(KERNEL_BUILD_DIR)/sym_include.txt
+       grep -Fvf $(KERNEL_BUILD_DIR)/mod_symtab.txt $(KERNEL_BUILD_DIR)/kernel_symtab.txt > $(KERNEL_BUILD_DIR)/sym_exclude.txt
        ( \
                echo '#define SYMTAB_KEEP \'; \
-               cat $(KERNEL_BUILD_DIR)/symtab.txt | \
-                       awk '{print "*(__ksymtab." $$$$1 ") \\" }'; \
+               cat $(KERNEL_BUILD_DIR)/sym_include.txt | \
+                       awk '{print "KEEP(*(___ksymtab+" $$$$1 ")) \\" }'; \
                echo; \
                echo '#define SYMTAB_KEEP_GPL \'; \
-               cat $(KERNEL_BUILD_DIR)/symtab.txt | \
-                       awk '{print "*(__ksymtab_gpl." $$$$1 ") \\" }'; \
+               cat $(KERNEL_BUILD_DIR)/sym_include.txt | \
+                       awk '{print "KEEP(*(___ksymtab_gpl+" $$$$1 ")) \\" }'; \
+               echo; \
+               echo '#define SYMTAB_DISCARD \'; \
+               cat $(KERNEL_BUILD_DIR)/sym_exclude.txt | \
+                       awk '{print "*(___ksymtab+" $$$$1 ") \\" }'; \
                echo; \
-               echo '#define SYMTAB_KEEP_STR \'; \
-               cat $(KERNEL_BUILD_DIR)/symtab.txt | \
-                       awk '{print "*(__ksymtab_strings." $$$$1 ") \\" }'; \
+               echo '#define SYMTAB_DISCARD_GPL \'; \
+               cat $(KERNEL_BUILD_DIR)/sym_exclude.txt | \
+                       awk '{print "*(___ksymtab_gpl+" $$$$1 ") \\" }'; \
                echo; \
        ) > $$@