diff options
| author | nbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73> | 2009-08-08 14:22:04 +0000 |
|---|---|---|
| committer | nbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73> | 2009-08-08 14:22:04 +0000 |
| commit | ba38e0585024837bc59c618bdd2adfd42d2d9af8 (patch) | |
| tree | df21f6ee4ec1fd3d2c7111ab593dc88dc72a16cc /include | |
| parent | 321577a2dbf5941ff44fa72bdd6a7268c5539b21 (diff) | |
add an optional config option for stripping all unnecessary symbol exports from the kernel image
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@17181 3c298f89-4303-0410-b956-a3cf2f4a3e73
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)) |