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I'd like to grab information from the shell and pass it into a kernel module through the makefile. I can do this with user space programs using -D.

Is there a similar mechanism for kernel modules? For example, if I define a makefile variable

CURRENT_DATE := '"$(shell date +"%Y%m%dT%H%M%SZ")"'

I can get a hold of that date as a string in the user space program by appending -DCURRENT_DATE to the end of the build command. Is there a way to do this with kernel modules?

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  • I don't understand the question, You know about shell, Are you asking about building kernel modules? Have you seen kernel.org/doc/html/v5.9/kbuild/index.html Commented Dec 19, 2024 at 7:51
  • The question pertains to kernel module builds with make. Say I want to embed a variable value in the module when it's built to identify the build date. With user space programs built using make, I can pass variables with -D<var_name> and have the C program copy the string encoded as <var_name> when it starts. Is there a similar mechanism for passing variables through the build process with modules? Commented Dec 19, 2024 at 16:45

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