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-rw-r--r--gcc/flags.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/gcc/flags.h b/gcc/flags.h
index 3ed4a31ff46..9ca120c2020 100644
--- a/gcc/flags.h
+++ b/gcc/flags.h
@@ -20,7 +20,7 @@ the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* Name of the input .c file being compiled. */
-extern char *main_input_filename;
+extern const char *main_input_filename;
enum debug_info_type
{