murdock: also compile with LLVM/clang

There are two major reasons for this:

1. clang picks up different errors sometimes than GCC.
2. OSX support is hardened as it is usually the toolchain used there.

.murdock

@@ -1,6 +1,9 @@
 #!/bin/sh
 
-export TEST_BOARDS_AVAILABLE=${TEST_BOARDS_AVAILABLE:-"samr21-xpro"}
+: ${TEST_BOARDS_AVAILABLE:="samr21-xpro"}
+# TODO provide make target in similar fashion as the info-boards-supported one?
+: ${TEST_BOARDS_LLVM_COMPILE:="native"}
+
 export RIOT_CI_BUILD=1
 export STATIC_TESTS=${STATIC_TESTS:-1}
 export CFLAGS_DBG=""
@@ -9,7 +12,7 @@ export DLCACHE_DIR=${DLCACHE_DIR:-~/.dlcache}
 NIGHTLY=${NIGHTLY:-0}
 RUN_TESTS=${RUN_TESTS:-${NIGHTLY}}
 
-DWQ_ENV="-E BOARDS -E APPS -E NIGHTLY -E RUN_TESTS"
+DWQ_ENV="-E BOARDS -E APPS -E NIGHTLY -E RUN_TESTS -E TOOLCHAIN"
 
 check_label() {
     local label="${1}"
@@ -92,21 +95,36 @@ get_supported_boards() {
     done | $(_greplist $BOARDS)
 }
 
-# given an app dir as parameter, print "$appdir board" for each supported
-# board. Only print for boards in $BOARDS.
-get_app_board_pairs() {
+get_supported_toolchains() {
+    local appdir=$1
+    local board=$2
+    local toolchains="gnu"
+
+    if is_in_list "${board}" "${TEST_BOARDS_LLVM_COMPILE}"; then
+        toolchains="$(make -s --no-print-directory -C${appdir} BOARD=${board} \
+                      info-toolchains-supported 2> /dev/null | grep -o -e "llvm" -e "gnu")"
+    fi
+    echo "${toolchains}"
+}
+
+# given an app dir as parameter, print "$appdir $board:$toolchain" for each
+# supported board and toolchain. Only print for boards in $BOARDS.
+get_app_board_toolchain_pairs() {
     local appdir=$1
     for board in $(get_supported_boards $appdir)
     do
-        echo $appdir $board
+        for toolchain in $(get_supported_toolchains $appdir $board)
+        do
+            echo $appdir $board:$toolchain
+        done
     done | $(_greplist $BOARDS)
 }
 
-# use dwqc to create full "appdir board" compile job list
+# use dwqc to create full "appdir board toolchain" compile job list
 get_compile_jobs() {
     get_apps | \
         dwqc ${DWQ_ENV} -s \
-        "$0 get_app_board_pairs \${1}" \
+        "$0 get_app_board_toolchain_pairs \${1}" \
         | xargs '-d\n' -n 1 echo $0 compile
 }
 
@@ -115,10 +133,11 @@ print_worker() {
         echo "-- running on worker ${DWQ_WORKER} thread ${DWQ_WORKER_THREAD}, build number $DWQ_WORKER_BUILDNUM."
 }
 
-# compile one app for one board. delete intermediates.
+# compile one app for one board with one toolchain. delete intermediates.
 compile() {
     local appdir=$1
-    local board=$2
+    local board=$(echo $2 | cut -f 1 -d':')
+    local toolchain=$(echo $2 | cut -f 2 -d':')
 
     [ "$board" = "makefile_broken" ] && error "$0: Makefile in \"$appdir\" seems to be broken!"
 
@@ -132,12 +151,12 @@ compile() {
     print_worker
 
     # sanity checks
-    [ $# -ne 2 ] && error "$0: compile: invalid parameters (expected \$appdir \$board)"
+    [ $# -ne 2 ] && error "$0: compile: invalid parameters (expected \$appdir \$board:\$toolchain)"
     [ ! -d "$appdir" ] && error "$0: compile: error: application directory \"$appdir\" doesn't exist"
     [ ! -d "boards/$board" ] && error "$0: compile: error: board directory \"boards/$board\" doesn't exist"
 
     # compile
-    CCACHE_BASEDIR="$(pwd)" BOARD=$board RIOT_CI_BUILD=1 \
+    CCACHE_BASEDIR="$(pwd)" BOARD=$board TOOLCHAIN=$toolchain RIOT_CI_BUILD=1 \
         make -C${appdir} clean all -j${JOBS:-4}
     RES=$?
 
@@ -169,7 +188,8 @@ compile() {
 
 test_job() {
     local appdir=$1
-    local board=$2
+    local board=$(echo $2 | cut -f 1 -d':')
+    local toolchain=$(echo $2 | cut -f 2 -d':')
     local flashfile="$3"
 
     [ ! -f "$flashfile" ] && {
@@ -183,16 +203,17 @@ test_job() {
         --file $flashfile:$appdir/bin/${board}/$(basename $flashfile) \
         --queue ${TEST_QUEUE:-$board} \
         --maxfail 1 \
-        "./.murdock run_test $appdir $board"
+        "./.murdock run_test $appdir $board:$toolchain"
 }
 
 run_test() {
     local appdir=$1
-    local board=$2
+    local board=$(echo $2 | cut -f 1 -d':')
+    local toolchain=$(echo $2 | cut -f 2 -d':')
     print_worker
-    echo "-- executing tests for $appdir on $board:"
+    echo "-- executing tests for $appdir on $board (compiled with $toolchain toolchain):"
     hook run_test_pre
-    BOARD=$board make -C$appdir flash-only test
+    BOARD=$board TOOLCHAIN=${toolchain} make -C$appdir flash-only test
 }
 
 # execute static tests

makefiles/murdock.inc.mk

@@ -16,7 +16,7 @@ test-murdock:
 	cd $(RIOTBASE) && \
 		./.murdock test_job \
 		$$(realpath --relative-to $(RIOTBASE) $(APPDIR)) \
-		$(BOARD) \
+		"$(BOARD):$(TOOLCHAIN)" \
 		$(FLASHFILE)
 
 # don't whitelist tests if there's no binary