Makefiles: Teach LLVM's recursive makefile descent to update objdir Makefiles if

they are out of date, instead of only testing if they exist.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105636 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/Makefile.rules b/Makefile.rules
index fb1f83d22306ed9be97592bd31ebc3941ce7ff9c..a058838d6100c0e6058100897b2d586b5f27759c 100644 (file)
--- a/Makefile.rules
+++ b/Makefile.rules
@@ -807,7 +807,8 @@ SubDirs += $(DIRS)
 ifneq ($(PROJ_SRC_ROOT),$(PROJ_OBJ_ROOT))
 $(RecursiveTargets)::
        $(Verb) for dir in $(DIRS); do \
-         if [ ! -f $$dir/Makefile ]; then \
+         if ([ ! -f $$dir/Makefile ] || \
+             [ $$dir/Makefile -ot $(PROJ_SRC_DIR)/$$dir/Makefile ]); then \
            $(MKDIR) $$dir; \
            $(CP) $(PROJ_SRC_DIR)/$$dir/Makefile $$dir/Makefile; \
          fi; \
@@ -829,7 +830,8 @@ endif
 ifdef EXPERIMENTAL_DIRS
 $(RecursiveTargets)::
        $(Verb) for dir in $(EXPERIMENTAL_DIRS); do \
-         if [ ! -f $$dir/Makefile ]; then \
+         if ([ ! -f $$dir/Makefile ] || \
+             [ $$dir/Makefile -ot $(PROJ_SRC_DIR)/$$dir/Makefile ]); then \
            $(MKDIR) $$dir; \
            $(CP) $(PROJ_SRC_DIR)/$$dir/Makefile $$dir/Makefile; \
          fi; \
@@ -863,7 +865,9 @@ unitcheck:: $(addsuffix /.makeunitcheck,$(PARALLEL_DIRS))
 ParallelTargets := $(foreach T,$(RecursiveTargets),%/.make$(T))
 
 $(ParallelTargets) :
-       $(Verb) if [ ! -f $(@D)/Makefile ]; then \
+       $(Verb) if ([ ! -f $(@D)/Makefile ] || \
+                   [ $(@D)/Makefile -ot \
+                      $(PROJ_SRC_DIR)/$(@D)/Makefile ]); then \
          $(MKDIR) $(@D); \
          $(CP) $(PROJ_SRC_DIR)/$(@D)/Makefile $(@D)/Makefile; \
        fi; \
@@ -882,7 +886,8 @@ ifneq ($(PROJ_SRC_ROOT),$(PROJ_OBJ_ROOT))
 $(RecursiveTargets)::
        $(Verb) for dir in $(OPTIONAL_DIRS); do \
          if [ -d $(PROJ_SRC_DIR)/$$dir ]; then\
-           if [ ! -f $$dir/Makefile ]; then \
+           if ([ ! -f $$dir/Makefile ] || \
+               [ $$dir/Makefile -ot $(PROJ_SRC_DIR)/$$dir/Makefile ]); then \
              $(MKDIR) $$dir; \
              $(CP) $(PROJ_SRC_DIR)/$$dir/Makefile $$dir/Makefile; \
            fi; \