freebsd - A quesiton about "Warning: Object directory not changed from original" when executing "make" command -

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i post issue on freebsd mailing list, unfortunately can't receive response. repost question here, , hope behavor doesn't violate conduct code of so.

i writing simple freebsd kernel module. after rebooting machine (i not sure whether reason), find "make" command can't work, , prompts following words: 

# make warning: object directory not changed original /root/hello

even though delete , upload new file, issue still exists.

after referring post, try "make obj" command, "make" works: 

# make obj /usr/obj/root/hello created /root/hello # make @ -> /usr/src/sys machine -> /usr/src/sys/amd64/include x86 -> /usr/src/sys/x86/include ......

i can't figure out root cause behind it:
(1) why make complain "warning: object directory not changed original /root/hello" although have updated file?
(2) why "make obj" can save "make"?


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