contrib/jenkins: tweak shell logic

Move the logic down to where make gets called, so we don't need the
variable. Print whether we use CLANG or GCC.

Don't put /opt/llvm-arm/bin infront of PATH unless building with CLANG.
Right now it doesn't seem to have e.g. an override for gcc, but the
files in that path may change when we update
LLVM-embedded-toolchain-for-Arm.

Related: OS#6026
Change-Id: Id768e0dbed9265f042b942e6699683723ca40a7c
diff --git a/contrib/jenkins.sh b/contrib/jenkins.sh
index 1e2846c..e53a450 100755
--- a/contrib/jenkins.sh
+++ b/contrib/jenkins.sh
@@ -38,7 +38,6 @@
 for build in $BUILDS; do
 	board=`echo $build | cut -d "/" -f 1`
 	app=`echo $build | cut -d "/" -f 2`
-	[ "$app" == "dfu" ] && use_clang_for_bl=1 || use_clang_for_bl=0
 	case "$build" in
 		"owhw/cardem")
 			comb="combined"
@@ -57,9 +56,16 @@
 			;;
 	esac
 	echo
-	echo "=============== $board / $app START  =============="
-	PATH="/opt/llvm-arm/bin:$PATH" make USE_CLANG="$use_clang_for_bl" BOARD="$board" APP="$app" $comb
-	echo "=============== $board / $app RES:$? =============="
+	# Build the bootloader with clang, the rest with gcc (OS#5260, OS#6026)
+	if [ "$app" = "dfu" ]; then
+		echo "=============== $board / $app START (CLANG) =============="
+		PATH="/opt/llvm-arm/bin:$PATH" make USE_CLANG=1 BOARD="$board" APP="$app" $comb
+		echo "=============== $board / $app RES:$? =============="
+	else
+		echo "=============== $board / $app START (GCC) =============="
+		make USE_CLANG=0 BOARD="$board" APP="$app" $comb
+		echo "=============== $board / $app RES:$? =============="
+	fi
 done
 
 echo