https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80776
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |13.0
--- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Martin Sebor from comment #7)
> Reconfirming that test case in comment #2 still triggers the warning in GCC
> 10. The dump shows that the warning thinks the fifth directive (%02d)
> generates between 2 and 10 bytes of output. The symptoms feel similar to
> pr94021 but I haven't looked into whether they underlying root causes are
> related.
That testcase looks to be fixed in GCC 13:
/app/example.cpp:13: __builtin_sprintf: objsize = 15, fmtstr =
"%04d%02d%02d%02d%02d%02d"
Directive 1 at offset 0: "%04d"
Result: 4, 4, 4, 4 (4, 4, 4, 4)
Directive 2 at offset 4: "%02d"
Result: 2, 2, 2, 2 (6, 6, 6, 6)
Directive 3 at offset 8: "%02d"
Result: 2, 2, 2, 2 (8, 8, 8, 8)
Directive 4 at offset 12: "%02d"
Result: 2, 2, 2, 2 (10, 10, 10, 10)
Directive 5 at offset 16: "%02d"
Result: 2, 2, 2, 2 (12, 12, 12, 12)
Directive 6 at offset 20: "%02d"
Result: 2, 2, 2, 2 (14, 14, 14, 14)
Directive 7 at offset 24: "", length = 1
Substituting 14 for return value.
GCC 13:
# RANGE [irange] int [-999, 9999]
intD.6 a_14(D) = aD.2739;
# RANGE [irange] int [1, 12] NONZERO 0xf
intD.6 b_15(D) = bD.2740;
# RANGE [irange] int [1, 31] NONZERO 0x1f
intD.6 c_16(D) = cD.2741;
# RANGE [irange] int [0, 23] NONZERO 0x1f
intD.6 d_17(D) = dD.2742;
# RANGE [irange] int [0, 59] NONZERO 0x3f
intD.6 e_18(D) = eD.2743;
# RANGE [irange] int [0, 60] NONZERO 0x3f
intD.6 f_19(D) = fD.2744;
GCC 12:
# RANGE [-999, 9999]
intD.6 a_14(D) = aD.1979;
# RANGE [1, 12] NONZERO 15
intD.6 b_15(D) = bD.1980;
# RANGE [1, 31] NONZERO 31
intD.6 c_16(D) = cD.1981;
# RANGE [0, 23] NONZERO 31
intD.6 d_17(D) = dD.1982;
# RANGE [0, 2147483647] NONZERO 2147483647
intD.6 e_18(D) = eD.1983;
# RANGE [0, 2147483647] NONZERO 2147483647
intD.6 f_19(D) = fD.1984;
So yes this has been fixed for GCC 13.
