Add make testspp.all/testspp.20

like we have already make tests2.XX.

Makefile

@@ -349,6 +349,9 @@ test:
 tests2.%:
 	$(MAKE) -C tests/tests2 $@
 
+testspp.%:
+	$(MAKE) -C tests/pp $@
+
 clean:
 	rm -f tcc$(EXESUF) tcc_p$(EXESUF) *-tcc$(EXESUF) tcc.pod
 	rm -f  *~ *.o *.a *.so* *.out *.log lib*.def *.exe *.dll a.out tags TAGS
@@ -394,6 +397,8 @@ help:
 	@echo ""
 	@echo "make tests2.all / make tests2.37 / make tests2.37+"
 	@echo "   run all/single test(s) from tests2, optionally update .expect"
+	@echo "make testspp.all / make testspp.17"
+	@echo "   run all/single test(s) from tests/pp"
 	@echo ""
 	@echo "Other supported make targets:"
 	@echo "   install install-strip tags ETAGS tar clean distclean help"

tests/pp/Makefile

@@ -10,7 +10,7 @@ VPATH = $(SRC)
 files = $(patsubst %.$1,%.test,$(notdir $(wildcard $(SRC)/*.$1)))
 TESTS = $(call files,c) $(call files,S)
 
-all test : $(sort $(TESTS))
+all test testspp.all: $(sort $(TESTS))
 
 DIFF_OPTS = -Nu -b -B
 
@@ -29,6 +29,8 @@ FILTER = 2>&1 | sed 's,$(SRC)/,,g'
 	    diff $(DIFF_OPTS) $(SRC)/$*.expect $*.output \
 	    && rm -f $*.output
 
+testspp.%: %.test ;
+
 # automatically generate .expect files with gcc:
 %.expect: # %.c
 	gcc -E -P $*.[cS] >$*.expect 2>&1