Build cscope.out files in a separate directory

Try following steps:

1 . Generate cscope.files

find /my/src -name '*.c' -o -name '*.h' > /my/db/cscope.files

2 . Run cscope on the generated result

cscope -i /my/db/cscope.files

3 . Export to environment variable

CSCOPE_DB=/my/db/cscope.out; export CSCOPE_DB

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