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scripts: coccicheck: warn on unset debug file

coccicheck prints debug logs to stdout unless a debug file has been set.
This makes it hard to read coccinelle's suggested changes, especially
for someone new to coccicheck.

From this commit, we warn about this behaviour from within the script on
an unset debug file. Explicitly setting the debug file to /dev/null
suppresses the warning while keeping the default.

Signed-off-by: Benjamin Philip <benjamin.philip495@gmail.com>
Signed-off-by: Julia Lawall <julia.lawall@inria.fr>

authored by

Benjamin Philip and committed by
Julia Lawall bb1c9ccf 8952cfe4

+5
+5
scripts/coccicheck
··· 260 260 } 261 261 262 262 if [ "$DEBUG_FILE" = "" ]; then 263 + echo 'You have not explicitly specified the debug file to use.' 264 + echo 'Using default "/dev/null" as debug file.' 265 + echo 'Debug logs will be printed to stdout.' 266 + echo 'You can specify the debug file with "make coccicheck DEBUG_FILE=<debug_file>"' 267 + echo '' 263 268 DEBUG_FILE="/dev/null" 264 269 fi 265 270