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-rw-r--r--gcc/c-opts.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/gcc/c-opts.c b/gcc/c-opts.c
index 69c4d54..1413b7f 100644
--- a/gcc/c-opts.c
+++ b/gcc/c-opts.c
@@ -1668,6 +1668,7 @@ handle_OPT_d (const char *arg)
case 'M': /* Dump macros only. */
case 'N': /* Dump names. */
case 'D': /* Dump definitions. */
+ case 'U': /* Dump used macros. */
flag_dump_macros = c;
break;