account for files generated by -save-temps; minor updates to readme

.gitignore

@@ -5,6 +5,10 @@
 src/*.tmp
 src/depend
 
+# generated by -save-temps
+*.i
+*.ii
+
 # binaries
 mfakto
 *.elf

README.txt

@@ -36,9 +36,9 @@ Contents
 7      Plans
 
 
-#####################
-# 0 What is mfakto? #
-#####################
+##################
+# 0 About mfakto #
+##################
 
 mfakto is an OpenCL port of mfaktc that aims to have the same features and
 functions. mfaktc is a program that trial factors Mersenne numbers. It stands
@@ -401,12 +401,12 @@ Submitting results:
 
 - mfakto can find factors outside the given range.
   This is because mfakto works on huge factor blocks, controlled by GridSize in
-  the INI file. The default value GridSize=3 means mfakto runs up to 1048576
+  the INI file. The default value of GridSize=3 means mfakto runs up to 1048576
   factor candidates at once, per class. So the last block of each class is
-  filled with factor candidates above the upper limit. This is a huge overhead
-  for small ranges but can be safely ignored for larger ranges. For example,
-  the average overhead is 0.5% for a class with 100 blocks but only 0.05% for
-  one with 1000 blocks.
+  filled up with factor candidates to above the upper bit level. This is a huge
+  overhead for small ranges but can be safely ignored for larger ranges.
+  For example, the average overhead is 0.5% for a class with 100 blocks but
+  only 0.05% for one with 1000 blocks.
 
 ############
 # 5 Tuning #

src/Makefile

@@ -112,7 +112,7 @@ all: $(ALL_TARGETS)
 	$(LD) $^ $(LDFLAGS) -o $@
 
 clean:
-	$(RM) *.o *~ depend
+	$(RM) *.o *~ depend *.i *.ii
 
 sieve.o : sieve.c
 	$(CC) $(CFLAGS) $(CFLAGS_EXTRA_SIEVE) -c $< -o $@
@@ -141,9 +141,13 @@ depend: $(CSRC)
 	mv $@.tmp $@
 
 ifdef MAKECMDGOALS
-ifneq ($(MAKECMDGOALS), clean)
+	goals := $(MAKECMDGOALS)
+else
+	goals := all
+endif
+
+ifneq ($(goals), clean)
 ifneq (, $(wildcard depend))
 include depend
 endif
 endif
-endif