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authorFelix Fietkau <nbd@openwrt.org>2013-12-14 13:14:44 +0000
committerFelix Fietkau <nbd@openwrt.org>2013-12-14 13:14:44 +0000
commit5a6a47e43129716946df6309d3495f5205c7dd95 (patch)
tree6c810c60272fa6eb783f96ca56ccfc93da180aba
parent6cb542d6a4d7c3fb1120472be0320098742d2ae7 (diff)
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build: speed up kernel symbol export stripping
GNU grep has a high per-expression setup overhead when compiling regular expressions. Use -F to force it to interpret the input as fixed strings, which is much faster (fraction of a second instead of multiple minutes). Signed-off-by: Felix Fietkau <nbd@openwrt.org> SVN-Revision: 39049
-rw-r--r--include/kernel-build.mk6
1 files changed, 3 insertions, 3 deletions
diff --git a/include/kernel-build.mk b/include/kernel-build.mk
index 27c7aee17a..d34365837d 100644
--- a/include/kernel-build.mk
+++ b/include/kernel-build.mk
@@ -76,9 +76,9 @@ define BuildKernel
xargs $(TARGET_CROSS)nm | \
awk '$$$$1 == "U" { print $$$$2 } ' | \
sort -u > $(KERNEL_BUILD_DIR)/mod_symtab.txt
- $(TARGET_CROSS)nm -n $(LINUX_DIR)/vmlinux.o | grep ' r __ksymtab' | sed -e 's,........ r __ksymtab_,,' > $(KERNEL_BUILD_DIR)/kernel_symtab.txt
- grep -f $(KERNEL_BUILD_DIR)/mod_symtab.txt $(KERNEL_BUILD_DIR)/kernel_symtab.txt > $(KERNEL_BUILD_DIR)/sym_include.txt
- grep -vf $(KERNEL_BUILD_DIR)/mod_symtab.txt $(KERNEL_BUILD_DIR)/kernel_symtab.txt > $(KERNEL_BUILD_DIR)/sym_exclude.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)/sym_include.txt | \