ci: Filter file list for assert compile

Add support for a deadcode_exceptions file that contains a list of files
are allowed to not be compiled. Useful for API code that are seasonally
committed.

Signed-off-by: Jorge Marques <[email protected]>

Author: gastmaier

ci/build.sh

@@ -891,8 +891,17 @@ compile_clang_analyzer () {
 
 assert_compiled () {
 	export step_name="assert_compiled"
+	local exceptions_file="ci/travis/deadcode_exceptions"
 	local files=$(git diff --diff-filter=ACM --no-renames --name-only $base_sha..$head_sha)
 	local fail=0
+	local error="
+	 At least one file was not compiled during kernel compilation
+	 Either:
+	  1. ensure the Kconfig is able to enable it/them
+	 OR
+	  2. remove deadcode
+	 OR
+	  3. add it/them in file '$exceptions_file'"
 
 	echo "$step_name were compiled on range $base_sha..$head_sha"
 
@@ -901,6 +910,11 @@ assert_compiled () {
 		return 1
 	fi
 
+	# Allows deadcode
+	if [[ -f $exceptions_file ]]; then
+		files=$(comm -13 <(sort $exceptions_file) <(echo $files | tr ' ' '\n' | sort))
+	fi
+
 	while read file; do
 		case "$file" in
 		*.c)
@@ -909,14 +923,18 @@ assert_compiled () {
 			compile_cmd=$(jq ".[] | select(.file == \"$abs_file\") |
 				      .command" compile_commands.json)
 			if [[ -z "$compile_cmd" ]]; then
-				echo "::error file=$file,line=0::$step_name: Was not compiled during kernel compilation, ensure defconfig enables it"
+				echo "::error file=$file,line=0::$step_name: Was not compiled during kernel compilation."
 				fail=1
 			fi
 			;;
 		esac
 
 	done <<< "$files"
 
+	if [[ "$fail" == "true" ]]; then
+		_fmt "::error ::$step_name: $error"
+	fi
+
 	return $fail
 }