Identifiers can start and/or contain '.' in *.S

modified version of the old one which don't allow '.'
    in #define Identifiers. This allow correctly preprocess
    the following code in *.S

        #define SRC(y...)               \
        9999: y;                        \
        .section __ex_table, "a";       \
        .long 9999b, 6001f      ;       \
        // .previous

        SRC(1: movw (%esi), %bx)
        6001:

    A test included.

tests/Makefile

@@ -73,7 +73,11 @@ DISAS = objdump -d
 
 # libtcc test
 ifdef LIBTCC1
- LIBTCC1:=$(TOP)/$(LIBTCC1)
+ ifdef CONFIG_WIN32
+    LIBTCC1:=$(TOP)/win32/libtcc/libtcc.a
+ else
+    LIBTCC1:=$(TOP)/$(LIBTCC1)
+ endif
 endif
 
 all test : $(TESTS)

tests/pp/12.S

@@ -0,0 +1,8 @@
+#define SRC(y...)                       \
+        9999: y;                        \
+        .section __ex_table, "a";       \
+        .long 9999b, 6001f      ;       \
+        // .previous
+
+    SRC(1: movw (%esi), %bx)
+6001:

tests/pp/12.expect

@@ -0,0 +1,2 @@
+    9999: 1: movw (%esi), %bx; .section __ex_table, "a"; .long 9999b, 6001f ;
+6001:

tests/pp/Makefile

@@ -7,6 +7,7 @@ include $(TOP)/Makefile
 
 TCC = $(TOP)/tcc
 TESTS = $(patsubst %.c,%.test,$(wildcard *.c))
+TESTS += $(patsubst %.S,%.test,$(wildcard *.S))
 
 ifdef CONFIG_WIN32
  TCC = $(top_srcdir)/win32/tcc
@@ -20,10 +21,19 @@ all test : $(TESTS)
 	    diff -Nu -b -B -I "^#" $(EXTRA_DIFF_OPTS) $*.expect $*.output \
 	    && rm -f $*.output
 
+%.test: %.S %.expect
+	@echo PPTest $* ...
+	@$(TCC) -E -P $< >$*.output 2>&1 ; \
+	    diff -Nu -b -B -I "^#" $(EXTRA_DIFF_OPTS) $*.expect $*.output \
+	    && rm -f $*.output
+
 # automatically generate .expect files with gcc:
-%.expect :
+%.expect: %.c
 	gcc -E -P $*.c >$*.expect 2>&1
 
+%.expect: %.S
+	gcc -E -P $*.S >$*.expect 2>&1
+
 # tell make not to delete
 .PRECIOUS: %.expect