CODEWITHSUNDEEP
awkmakefilesyntax-error
rajeshk
rajeshk

Reputation: 738

Makefile Awk using $ for column gets syntax error, while it works fine on console

I'm using the below line perfectly fine on the console, but when i use it in a makefile i get the below error. I have tried different things for last hour, nothing helps me. Also i have to use '@' before the command in makefile, that is normal only. Any help is greatly welcome.

Command on console

cpio -itv < rootfs.cpio | awk '!/^d/{$8="";print}' | sort -k8 > rootfs.layout.trim

Error

awk: !/^d/{="";print}
awk:       ^ syntax error

In makefile

log-rootfs:
# copy the layout dump with all the modification needed to sync with stb output
# get the file list from cpio file => remove the lines with directory name => sort the output and store the same in layout file
cpio -itv < $(ROOTFS_CPIO_FILE) | awk '!/^d/{$8="";print}' | sort -k8 > $(ROOTFS_LAYOUT)
@echo $(ROOTFS_LAYOUT) is created

Upvotes: 2

Views: 889

Answers (1)

William Pursell
William Pursell

Reputation: 212444

make is looking for a variable/macro named $8. In general, $ needs to be escaped in the makefile, and if you want to pass a literal $ to the shell, you should use $$ in the makefile. In other words, try:

rule:
  ... awk '!/^d/{$$8="";print}' ...

Upvotes: 5

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