[llvm-commits] CVS: llvm/tools/llvm-config/Makefile

[Reid Spencer]

Changes in directory llvm/tools/llvm-config:

Makefile updated: 1.18 -> 1.19
---
Log message:

Fix PR1040: http://llvm.org/PR1040 :
Don't rebuild llvm-config if none of the library dependencies changed.


---
Diffs of the changes:  (+8 -3)

 Makefile |   11 ++++++++---
 1 files changed, 8 insertions(+), 3 deletions(-)


Index: llvm/tools/llvm-config/Makefile
diff -u llvm/tools/llvm-config/Makefile:1.18 llvm/tools/llvm-config/Makefile:1.19
--- llvm/tools/llvm-config/Makefile:1.18	Tue Dec  5 23:39:18 2006
+++ llvm/tools/llvm-config/Makefile	Mon Dec 11 18:43:38 2006
@@ -29,11 +29,16 @@
 
 FinalLibDeps = $(PROJ_OBJ_DIR)/FinalLibDeps.txt
 LibDeps      = $(PROJ_OBJ_DIR)/LibDeps.txt
+LibDepsTemp  = $(PROJ_OBJ_DIR)/LibDeps.txt.tmp
 GenLibDeps   = $(PROJ_SRC_ROOT)/utils/GenLibDeps.pl
 
-$(LibDeps): $(GenLibDeps) $(LibDir) $(wildcard $(LibDir)/*.a $(LibDir)/*.o)
-	$(Echo) "Regenerating LibDeps.txt"
-	$(Verb) $(GenLibDeps) -flat $(LibDir) $(NM_PATH) > $(LibDeps)
+$(LibDepsTemp): $(GenLibDeps) $(LibDir) $(wildcard $(LibDir)/*.a $(LibDir)/*.o)
+	$(Echo) "Regenerating LibDeps.txt.tmp"
+	$(Verb) $(GenLibDeps) -flat $(LibDir) $(NM_PATH) > $(LibDepsTemp)
+
+$(LibDeps): $(LibDepsTemp)
+	$(Verb) $(CMP) -s $@ $< || ( $(CP) $< $@ && \
+	  $(EchoCmd) Updated LibDeps.txt because dependencies changes )
 
 # Find all the cyclic dependencies between various LLVM libraries, so we
 # don't have to process them at runtime.