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| author | Felix Fietkau <nbd@openwrt.org> | 2009-08-08 14:22:04 +0000 |
|---|---|---|
| committer | Felix Fietkau <nbd@openwrt.org> | 2009-08-08 14:22:04 +0000 |
| commit | bb5a40c64b7c4f4848509fa0a6625055fc9e66cc (patch) | |
| tree | d02b9ad490e5885181ac20e22325bbce49d3f4bc /include | |
| parent | 253c9fcf7d948fb8763defe612cf53ee860744f3 (diff) | |
| download | upstream-bb5a40c64b7c4f4848509fa0a6625055fc9e66cc.tar.gz upstream-bb5a40c64b7c4f4848509fa0a6625055fc9e66cc.tar.bz2 upstream-bb5a40c64b7c4f4848509fa0a6625055fc9e66cc.zip | |
add an optional config option for stripping all unnecessary symbol exports from the kernel image
SVN-Revision: 17181
Diffstat (limited to 'include')
| -rw-r--r-- | include/kernel-build.mk | 24 | ||||
| -rw-r--r-- | include/kernel-defaults.mk | 5 |
2 files changed, 28 insertions, 1 deletions
diff --git a/include/kernel-build.mk b/include/kernel-build.mk index d48f8b9f53..e3e446ba58 100644 --- a/include/kernel-build.mk +++ b/include/kernel-build.mk @@ -54,6 +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 $$@ @@ -62,7 +84,7 @@ define BuildKernel $(Kernel/CompileModules) touch $$@ - $(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 $$@ diff --git a/include/kernel-defaults.mk b/include/kernel-defaults.mk index f205553587..0ba1e056a6 100644 --- a/include/kernel-defaults.mk +++ b/include/kernel-defaults.mk @@ -22,6 +22,11 @@ KERNEL_MAKEOPTS := -C $(LINUX_DIR) \ KBUILD_HAVE_NLS=no \ CONFIG_SHELL="$(BASH)" +ifdef CONFIG_STRIP_KERNEL_EXPORTS + KERNEL_MAKEOPTS += \ + EXTRA_LDSFLAGS="-I$(KERNEL_BUILD_DIR) -include symtab.h" +endif + INITRAMFS_EXTRA_FILES ?= $(GENERIC_PLATFORM_DIR)/image/initramfs-base-files.txt ifneq (,$(KERNEL_CC)) |