--- /dev/null
+/* PR preprocessor/89971 */
+/* { dg-do compile } */
+/* { dg-options "-std=gnu99" { target c } } */
+/* { dg-options "-std=c++20" { target c++ } } */
+
+int a, c;
+#define m1(...) a /##__VA_OPT__(b) c
+#define m2(...) a /##__VA_OPT__() c
+#define m3(...) a##__VA_OPT__()##b = 1
+#define m4(...) a##__VA_OPT__(b c d)##e = 2
+
+int
+foo (void)
+{
+ int d = m1();
+ int e = m2(1);
+ int m3(1 2 3);
+ int m4();
+ return d + e + ab + ae;
+}
tokens_buff_add_token (buff, virt_locs,
t, t->src_loc, t->src_loc,
NULL, 0);
+ continue;
}
- else if (src->flags & PASTE_LEFT)
+ if (start && paste_flag == start && (*start)->flags & PASTE_LEFT)
+ /* If __VA_OPT__ expands to nothing (either because __VA_ARGS__
+ is empty or because it is __VA_OPT__() ), drop PASTE_LEFT
+ flag from previous token. */
+ copy_paste_flag (pfile, start, &pfile->avoid_paste);
+ if (src->flags & PASTE_LEFT)
{
/* Don't avoid paste after all. */
while (paste_flag && paste_flag != start