./Makefile

*** 106,121 ****
      # prevents a new make run to reuse the previous servers.
      ifneq (,$(SJAVAC_SERVER_DIR))
        $(shell $(MKDIR) -p $(SJAVAC_SERVER_DIR) && $(RM) -rf $(SJAVAC_SERVER_DIR)/*)
      endif
  
      main-wrapper:
!         @$(if $(findstring clean, $(MAIN_TARGETS)), , $(call AtMakeStart))
          (cd $(root_dir)/make && $(BUILD_LOG_WRAPPER) $(MAKE) -f Main.gmk SPEC=$(SPEC) -j $(JOBS) \
!             $(VERBOSE) VERBOSE=$(VERBOSE) LOG_LEVEL=$(LOG_LEVEL) $(MAIN_TARGETS) \
              $(if $(filter true, $(OUTPUT_SYNC_SUPPORTED)), -O$(OUTPUT_SYNC)))
!         @$(if $(findstring clean, $(MAIN_TARGETS)), , $(call AtMakeEnd))
  
       .PHONY: main-wrapper
  
     endif
  endif
--- 106,132 ----
      # prevents a new make run to reuse the previous servers.
      ifneq (,$(SJAVAC_SERVER_DIR))
        $(shell $(MKDIR) -p $(SJAVAC_SERVER_DIR) && $(RM) -rf $(SJAVAC_SERVER_DIR)/*)
      endif
  
+     # Split out the targets requiring sequential execution. Run these targets separately
+     # from the rest so that the rest may still enjoy full parallel execution.
+     SEQUENTIAL_TARGETS := $(filter dist-clean clean% reconfigure, $(MAIN_TARGETS))
+     PARALLEL_TARGETS := $(filter-out $(SEQUENTIAL_TARGETS), $(MAIN_TARGETS))
+ 
      main-wrapper:
!         ifneq ($(SEQUENTIAL_TARGETS), )
!           (cd $(root_dir)/make && $(MAKE) -f Main.gmk SPEC=$(SPEC) -j 1 \
!               $(VERBOSE) VERBOSE=$(VERBOSE) LOG_LEVEL=$(LOG_LEVEL) $(SEQUENTIAL_TARGETS))
!         endif
!         ifneq ($(PARALLEL_TARGETS), )
!           @$(call AtMakeStart)
            (cd $(root_dir)/make && $(BUILD_LOG_WRAPPER) $(MAKE) -f Main.gmk SPEC=$(SPEC) -j $(JOBS) \
!               $(VERBOSE) VERBOSE=$(VERBOSE) LOG_LEVEL=$(LOG_LEVEL) $(PARALLEL_TARGETS) \
                $(if $(filter true, $(OUTPUT_SYNC_SUPPORTED)), -O$(OUTPUT_SYNC)))
!           @$(call AtMakeEnd)
!         endif
  
       .PHONY: main-wrapper
  
     endif
  endif
*** 136,149 ****
          $(info .  make docs              # Create all docs)
          $(info .  make docs-javadoc      # Create just javadocs, depends on less than full docs)
          $(info .  make profiles          # Create complete j2re compact profile images)
          $(info .  make bootcycle-images  # Build images twice, second time with newly built JDK)
          $(info .  make install           # Install the generated images locally)
          $(info .  make clean             # Remove all files generated by make, but not those)
!         $(info .                         # generated by configure. Do not run clean and other)
!         $(info .                         # targets together as that might behave in an)
!         $(info .                         # unexpected way.)
          $(info .  make dist-clean        # Remove all files, including configuration)
          $(info .  make help              # Give some help on using make)
          $(info .  make test              # Run tests, default is all tests (see TEST below))
          $(info )
          $(info Targets for specific modules)
--- 147,159 ----
          $(info .  make docs              # Create all docs)
          $(info .  make docs-javadoc      # Create just javadocs, depends on less than full docs)
          $(info .  make profiles          # Create complete j2re compact profile images)
          $(info .  make bootcycle-images  # Build images twice, second time with newly built JDK)
          $(info .  make install           # Install the generated images locally)
+         $(info .  make reconfigure       # Rerun configure with the same arguments as last time)
          $(info .  make clean             # Remove all files generated by make, but not those)
!         $(info .                         # generated by configure)
          $(info .  make dist-clean        # Remove all files, including configuration)
          $(info .  make help              # Give some help on using make)
          $(info .  make test              # Run tests, default is all tests (see TEST below))
          $(info )
          $(info Targets for specific modules)