Allow macro in #line directive

Using:
  #define LINE1 10
  #line LINE1
  #define LINE2 20
  #define FILE "file"
  #line LINE2 FILE
Should now work.

Add new testcase tests/pp/23.S

tccpp.c

@@ -1929,31 +1929,34 @@ ST_FUNC void preprocess(int is_bof)
         break;
 
     case TOK_LINE:
-        next_nomacro();
-        if (tok != TOK_PPNUM) {
+        next();
+        if (tok != TOK_CINT) {
     _line_err:
             tcc_error("wrong #line format");
         }
+        n = tokc.i;
         goto _line_num;
     case TOK_PPNUM:
         if (parse_flags & PARSE_FLAG_ASM_FILE)
             goto ignore;
-    _line_num:
         for (n = 0, q = tokc.str.data; *q; ++q) {
             if (!isnum(*q))
                 goto _line_err;
             n = n * 10 + *q - '0';
         }
-        next_nomacro();
-        if (tok != TOK_LINEFEED) {
-            if (tok == TOK_PPSTR && tokc.str.data[0] == '"') {
-                tokc.str.data[tokc.str.size - 2] = 0;
-                tccpp_putfile(tokc.str.data + 1);
-            } else
-                goto _line_err;
-        }
+    _line_num:
+        next();
+        if (tok == TOK_STR) {
+            tccpp_putfile(tokc.str.data);
+            n--;
+        }
+        else if (tok != TOK_LINEFEED)
+            goto _line_err;
+        if (macro_ptr && *macro_ptr == 0)
+            macro_stack->save_line_num = n;
         if (file->fd > 0)
             total_lines += file->line_num - n;
+        file->line_ref += file->line_num - n;
         file->line_num = n;
         goto ignore; /* skip optional level number */
 

tests/pp/23.S

@@ -0,0 +1,19 @@
+__LINE__
+# 10
+__LINE__
+# line 20
+__LINE__
+# 64mb
+__LINE__
+# line 30
+__LINE__
+#define LINE1 40
+# line LINE1
+__LINE__ __FILE__
+#define LINE2 50
+# line LINE2 "file1"
+__LINE__ __FILE__
+#define LINE3 60
+#define FILE "file2"
+# line LINE3 FILE
+__LINE__ __FILE__

tests/pp/23.expect

@@ -0,0 +1,8 @@
+1
+3
+20
+22
+30
+40 "23.S"
+50 "file1"
+60 "file2"