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authorQuentin Carbonneaux <quentin.carbonneaux@yale.edu>2015-07-22 10:28:15 -0400
committerQuentin Carbonneaux <quentin.carbonneaux@yale.edu>2015-09-15 23:01:29 -0400
commitee961fb4873891f009125fdde593a6c8e6ddd746 (patch)
treef26680437e5708354f6ecfc422bc25b2c776d038 /lisc/Makefile
parenteb1df2b81e18195bcf68dd56f4f339ceda7f5365 (diff)
downloadroux-ee961fb4873891f009125fdde593a6c8e6ddd746.tar.gz
always preserve last build
Diffstat (limited to 'lisc/Makefile')
-rw-r--r--lisc/Makefile3
1 files changed, 2 insertions, 1 deletions
diff --git a/lisc/Makefile b/lisc/Makefile
index bab0059..6404dd5 100644
--- a/lisc/Makefile
+++ b/lisc/Makefile
@@ -4,10 +4,11 @@ OBJ = main.o parse.o ssa.o live.o isel.o spill.o
 CFLAGS = -Wall -Wextra -std=c11 -g -pedantic
 
 $(BIN): $(OBJ)
+	mv $@ $@.old 2>/dev/null || exit 0
 	$(CC) $(LDFLAGS) $(OBJ) -o $@
 
 $(OBJ): lisc.h
 
 .PHONY: clean
 clean:
-	rm -f $(BIN) $(OBJ)
+	rm -f $(BIN) $(OBJ) *.old