Parallelize build jobs according to CPU count

test/external/fetch-repos.sh

@@ -7,10 +7,11 @@ usage() {
 	cat <<"EOF"
 Downloads source code of Game Boy project repos used as RGBDS test cases.
 Options:
-    -h, --help      show this help message
-    --only-free     download only freely licensed codebases
-    --get-hash      print repos' commit hashes instead of downloading them
-    --get-paths     print repos' clone paths instead of downloading them
+    -h, --help         show this help message
+    --only-free        download only freely licensed codebases
+    --only-nonfree     download only non-freely licensed codebases
+    --get-hash         print repos' commit hashes instead of downloading them
+    --get-paths        print repos' clone paths instead of downloading them
 EOF
 }
 

test/external/test.sh

@@ -8,13 +8,16 @@ export SOURCE_DATE_EPOCH=609165296
 
 cd "$(dirname "$0")"
 
-if [ ! -f "$1.cfg" ]; then
-	echo >&2 'External test file '"$1"'.cfg does not exist'
+NAME="$1"
+shift # Any remaining arguments get forwarded to `make`.
+
+if [ ! -f "$NAME.cfg" ]; then
+	echo >&2 'External test file '"$NAME"'.cfg does not exist'
 	exit 1
 fi
 
-# Sourcing "$1.cfg" defines `EXT_TEST_*` variables used below.
-. "$1.cfg"
+# Sourcing "$NAME.cfg" defines `EXT_TEST_*` variables used below.
+. "$NAME.cfg"
 
 if ! cd "$EXT_TEST_REPO"; then
 	echo >&2 'Please fetch test deps before running any external test'
@@ -23,7 +26,7 @@ fi
 
 RGBDS_PATH="RGBDS=../../../"
 git clean -fdx # Clean any previous build products so `make` rebuilds everything from scratch.
-make -j4 "$EXT_TEST_TARGET" $RGBDS_PATH
+make "$@" "$EXT_TEST_TARGET" $RGBDS_PATH
 
 hash="$(sha1sum -b "$EXT_TEST_FILE" | head -c 40)"
 if [ "$hash" != "$EXT_TEST_HASH" ]; then