Added make *-diff rules, quick commands to compare sizes

This required a patch to the --diff flag for the scripts to ignore
a missing file. This enables the useful one liner for making comparisons
with potentially missing previous versions:

    ./scripts/code.py lfs.o -d lfs.o.code.csv -o lfs.o.code.csv

    function (0 added, 0 removed)            old     new    diff
    TOTAL                                  25476   25476      +0

One downside, these previous files are easy to delete as a part of make
clean, which limits their usefulness for comparing configuration
changes...

Makefile

@@ -72,11 +72,6 @@ endif
 ifneq ($(OBJDUMP),objdump)
 override STRUCTSFLAGS += --objdump-tool="$(OBJDUMP)"
 endif
-override CODEFLAGS += -S
-override DATAFLAGS += -S
-override STACKFLAGS += -S
-override STRUCTSFLAGS += -S
-override COVERAGEFLAGS += -s
 
 
 # commands
@@ -94,26 +89,10 @@ size: $(OBJ)
 tags:
 	$(CTAGS) --totals --c-types=+p $(shell find -H -name '*.h') $(SRC)
 
-.PHONY: code
-code: $(OBJ)
-	./scripts/code.py $^ $(CODEFLAGS)
-
-.PHONY: data
-data: $(OBJ)
-	./scripts/data.py $^ $(DATAFLAGS)
-
 .PHONY: calls
 calls: $(CGI)
 	./scripts/calls.py $^ $(CALLSFLAGS)
 
-.PHONY: stack
-stack: $(CGI)
-	./scripts/stack.py $^ $(STACKFLAGS)
-
-.PHONY: structs
-structs: $(OBJ)
-	./scripts/structs.py $^ $(STRUCTSFLAGS)
-
 .PHONY: test
 test:
 	./scripts/test.py $(TESTFLAGS)
@@ -121,8 +100,44 @@ test:
 test%: tests/test$$(firstword $$(subst \#, ,%)).toml
 	./scripts/test.py $@ $(TESTFLAGS)
 
+.PHONY: code
+code: $(OBJ)
+	./scripts/code.py $^ -S $(CODEFLAGS)
+
+.PHONY: code-diff
+code-diff: $(OBJ)
+	./scripts/code.py $^ -d $(TARGET).code.csv -o $(TARGET).code.csv $(CODEFLAGS)
+
+.PHONY: data
+data: $(OBJ)
+	./scripts/data.py $^ -S $(DATAFLAGS)
+
+.PHONY: data-diff
+data-diff: $(OBJ)
+	./scripts/data.py $^ -d $(TARGET).data.csv -o $(TARGET).data.csv $(DATAFLAGS)
+
+.PHONY: stack
+stack: $(CGI)
+	./scripts/stack.py $^ -S $(STACKFLAGS)
+
+.PHONY: stack-diff
+stack-diff: $(CGI)
+	./scripts/stack.py $^ -d $(TARGET).stack.csv -o $(TARGET).stack.csv $(STACKFLAGS)
+
+.PHONY: structs
+structs: $(OBJ)
+	./scripts/structs.py $^ -S $(STRUCTSFLAGS)
+
+.PHONY: structs-diff
+structs-diff: $(OBJ)
+	./scripts/structs.py $^ -d $(TARGET).structs.csv -o $(TARGET).structs.csv $(STRUCTSFLAGS)
+
 .PHONY: coverage
 coverage:
+	./scripts/coverage.py $(BUILDDIR)tests/*.toml.info -s $(COVERAGEFLAGS)
+
+.PHONY: coverage-diff
+coverage-diff:
 	./scripts/coverage.py $(BUILDDIR)tests/*.toml.info $(COVERAGEFLAGS)
 
 # rules
@@ -148,6 +163,7 @@ $(BUILDDIR)%.ci: %.c
 .PHONY: clean
 clean:
 	rm -f $(TARGET)
+	rm -f $(TARGET).*.csv
 	rm -f $(OBJ)
 	rm -f $(CGI)
 	rm -f $(DEP)

scripts/code.py

@@ -90,6 +90,7 @@ def main(**args):
 
     # find previous results?
     if args.get('diff'):
+        try:
             with open(args['diff']) as f:
                 r = csv.DictReader(f)
                 prev_results = [
@@ -97,6 +98,8 @@ def main(**args):
                         result['function'],
                         int(result['code_size']))
                     for result in r]
+        except FileNotFoundError:
+            prev_results = []
 
         prev_total = 0
         for _, _, size in prev_results:

scripts/coverage.py

@@ -99,6 +99,7 @@ def main(**args):
 
     # find previous results?
     if args.get('diff'):
+        try:
             with open(args['diff']) as f:
                 r = csv.DictReader(f)
                 prev_results = [
@@ -107,6 +108,8 @@ def main(**args):
                         int(result['coverage_hits']),
                         int(result['coverage_count']))
                     for result in r]
+        except FileNotFoundError:
+            prev_results = []
 
         prev_total_hits, prev_total_count = 0, 0
         for _, _, hits, count in prev_results:

scripts/data.py

@@ -90,6 +90,7 @@ def main(**args):
 
     # find previous results?
     if args.get('diff'):
+        try:
             with open(args['diff']) as f:
                 r = csv.DictReader(f)
                 prev_results = [
@@ -97,6 +98,8 @@ def main(**args):
                         result['function'],
                         int(result['data_size']))
                     for result in r]
+        except FileNotFoundError:
+            prev_results = []
 
         prev_total = 0
         for _, _, size in prev_results:

scripts/stack.py

@@ -141,6 +141,7 @@ def main(**args):
 
     # find previous results?
     if args.get('diff'):
+        try:
             with open(args['diff']) as f:
                 r = csv.DictReader(f)
                 prev_results = [
@@ -149,6 +150,8 @@ def main(**args):
                         int(result['stack_frame']),
                         float(result['stack_limit']))
                     for result in r]
+        except FileNotFoundError:
+            prev_results = []
 
         prev_total_frame = 0
         prev_total_limit = 0

scripts/structs.py

@@ -98,6 +98,7 @@ def main(**args):
 
     # find previous results?
     if args.get('diff'):
+        try:
             with open(args['diff']) as f:
                 r = csv.DictReader(f)
                 prev_results = [
@@ -105,6 +106,8 @@ def main(**args):
                         result['struct'],
                         int(result['struct_size']))
                     for result in r]
+        except FileNotFoundError:
+            prev_results = []
 
         prev_total = 0
         for _, _, size in prev_results: