megaco/src/flex/Makefile.in: Support parallel make

Make sure that directories are created before they are used.

I tried to use order-only prerequisites to create the directories,
but run into two problems: First, order-only prerequisites are
only implemented in Make 3.80 and later. Second, on a computer
running Solaris/Intel 2.8 (with Make 3.80), order-only prerequisites
seemed to work like ordinary prerequisites, causing targets to
be re-built if the timestamp for the directory changed.

Therefore, using a shell command to run mkdir seems to be the
more portable solution.

1 files changed, 3 insertions, 8 deletions

diff --git a/lib/megaco/src/flex/Makefile.in b/lib/megaco/src/flex/Makefile.in
index 5af651d89b..2c46a673e4 100644
--- a/lib/megaco/src/flex/Makefile.in
+++ b/lib/megaco/src/flex/Makefile.in
@@ -391,7 +391,9 @@ $(STD_DRV).c: $(STD_DRV).flex
 $(MT_DRV).c: $(MT_DRV).flex
 	$(LEX) $(MT_LEX_FLAGS) -P$* -o$@ $< 
 
-solibs: $(LIBDIR) $(OBJDIR) $(SOLIBS) 
+_create_dirs := $(shell mkdir -p $(OBJDIR) $(LIBDIR))
+
+solibs: $(SOLIBS) 
 
 $(OBJDIR)/$(STD_DRV).o: $(STD_DRV).c 
 	@echo "compiling std driver:"
@@ -411,10 +413,3 @@ $(LIBDIR)/$(STD_DRV).$(DED_EXT): $(OBJDIR)/$(STD_DRV).o
 $(LIBDIR)/$(MT_DRV).$(DED_EXT): $(OBJDIR)/$(MT_DRV).o
 	@echo "linking multi-threaded driver:"
 	$(LD) $(LDFLAGS) -o $@ $< 
-
-$(LIBDIR):
-	-mkdir -p $(LIBDIR)
-
-$(OBJDIR):
-	-mkdir -p $(OBJDIR)
-