errors in builing

[honors1]

Dear Dongdong She,

I got the errors in building as follows. How to handle this error?

$ gcc -O3 -funroll-loops ./neuzz.c -o neuzz
./neuzz.c: In function ‘copy_seeds’:
./neuzz.c:1820:26: warning: ‘%s’ directive writing up to 255 bytes into a region of size 127 [-Wformat-overflow=]
1820 | sprintf(src, "%s/%s", in_dir, de->d_name);
| ^~
In file included from /usr/include/stdio.h:867,
from ./neuzz.c:3:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:36:10: note: ‘__builtin___sprintf_chk’ output 2 or more bytes (assuming 257) into a destination of size 128
36 | return __builtin___sprintf_chk (__s, __USE_FORTIFY_LEVEL - 1,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
37 | __bos (__s), __fmt, __va_arg_pack ());
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
./neuzz.c:1821:26: warning: ‘%s’ directive writing up to 255 bytes into a region of size 127 [-Wformat-overflow=]
1821 | sprintf(dst, "%s/%s", out_dir, de->d_name);
| ^~
In file included from /usr/include/stdio.h:867,
from ./neuzz.c:3:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:36:10: note: ‘__builtin___sprintf_chk’ output 2 or more bytes (assuming 257) into a destination of size 128
36 | return __builtin___sprintf_chk (__s, __USE_FORTIFY_LEVEL - 1,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
37 | __bos (__s), __fmt, __va_arg_pack ());
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

---

My environment is as following:

• OS: Ubuntu 20.04
• Python: conda virtual environment python=2.7 on miniconda 3.7
• gcc: gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0

---

[aditgeorge]

The error occurs because the version of gcc is too new.
Install and use gcc version 5