[FYI] {maint} tests: fix a spurious failure with Solaris make

[Stefano Lattarini]

* t/subdir-order.sh: Run make in parallel only if the make implementation
truly supports it.

Signed-off-by: Stefano Lattarini <address@hidden>
---
 t/subdir-order.sh |   14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/t/subdir-order.sh b/t/subdir-order.sh
index 0321c25..4c843cf 100644
--- a/t/subdir-order.sh
+++ b/t/subdir-order.sh
@@ -124,6 +124,17 @@ all-local:
        : > run
 END
 
+echo dummy: > Makefile
+if using_gmake; then
+  jobs=-j12
+elif $MAKE -j12; then
+  jobs=-j12
+elif $MAKE -j 12; then
+  jobs="-j 12"
+else
+  jobs=none
+fi
+rm -f Makefile
 
 $ACLOCAL
 $AUTOCONF
@@ -131,7 +142,8 @@ $AUTOMAKE -c --add-missing
 
 ./configure
 
-for j in '' -j12; do
+for j in '' "$jobs"; do
+  test x"$j" = x"none" && continue
   $MAKE $j
   test -f run
   test -f sub0/run
-- 
1.7.9.5