lkl: fix hijack and zpoline parallel builds

This is a follow up change for commit 3c97822 ("lkl: add tests
build barrier") tracked via #558.
The hijack and zpoline libraries also share object files, so need a
barrier to avoid parallel build failures.

Signed-off-by: David Disseldorp <[email protected]>

Author: ddiss

tools/lkl/Makefile

@@ -176,10 +176,11 @@ headers_install: $(TARGETS)
 	      include/lkl_config.h $(DESTDIR)$(INCDIR) ; \
 	    cp -r $(OUTPUT)include/lkl $(DESTDIR)$(INCDIR)
 
-libraries_install: $(libs-y:%=$(OUTPUT)%$(SOSUF)) $(OUTPUT)liblkl.a
-	$(call QUIET_INSTALL, libraries) \
+libraries_install: $(call expand-targets,$(libs-y),$(SOSUF)) $(OUTPUT)liblkl.a
+	# filter out special .WAIT targets from install
+	$(if $(filter .%,$^),,$(call QUIET_INSTALL, libraries) \
 	    install -d $(DESTDIR)$(LIBDIR) ; \
-	    install -m 644 $^ $(DESTDIR)$(LIBDIR)
+	    install -m 644 $^ $(DESTDIR)$(LIBDIR))
 
 programs_install: $(call expand-targets,$(progs-y),$(EXESUF))
 	$(call QUIET_INSTALL, programs) \

tools/lkl/Targets

@@ -2,6 +2,8 @@ libs-y += lib/liblkl
 
 ifneq ($(LKL_HOST_CONFIG_BSD),y)
 libs-$(LKL_HOST_CONFIG_POSIX) += lib/hijack/liblkl-hijack
+# hijack and zpoline targets share object files, breaking parallel builds
+libs-$(LKL_HOST_CONFIG_POSIX) += .WAIT
 libs-$(LKL_HOST_CONFIG_POSIX) += lib/hijack/liblkl-zpoline
 endif
 LDFLAGS_lib/hijack/liblkl-hijack-y += -shared -nodefaultlibs