https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120166
Bug ID: 120166
Summary: [15 Regression] constexpr array with 66 elements
yields "integer initializer is not an integer constant
expression"
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: hp at gcc dot gnu.org
Target Milestone: ---
Compiling the following code with plain gcc -c -std=c23 yields:
t.c:15:10: error: 'constexpr' integer initializer is not an integer constant
expression
15 | 0, 1, 2, 3, 4, 5, 6, 7,
Note that the ok_array with one less element yields no error. No error when
compiled as C++.
Works: r14-10114-g09680e3ee7d7 (native x86_64-linux; N.B.: needs explicit
-std=c23)
Also works: r16-456-g974b079741f9 (cris-elf)
Doesn't: r15-9238-g546f28f83ceba7 (aarch64-elf)
Doesn't: r16-48-gd508d24282c6 (aarch64-linux-gnu)
Also doesn't, according to my colleague, more importantly, the recent gcc-15
release for aarch64-linux-gnu.
So, this may be a case of a commit needing a backport to the gcc-15 branch.
constexpr unsigned char ok_array[] = {
0, 1, 2, 3, 4, 5, 6, 7,
8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23,
24, 25, 26, 27, 28, 29, 30, 31,
32, 33, 34, 35, 36, 37, 38, 39,
40, 41, 42, 43, 44, 45, 46, 47,
48, 49, 50, 51, 52, 53, 54, 55,
56, 57, 58, 59, 60, 61, 62, 63,
64,
};
constexpr unsigned char not_ok_array[] = {
0, 1, 2, 3, 4, 5, 6, 7,
8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23,
24, 25, 26, 27, 28, 29, 30, 31,
32, 33, 34, 35, 36, 37, 38, 39,
40, 41, 42, 43, 44, 45, 46, 47,
48, 49, 50, 51, 52, 53, 54, 55,
56, 57, 58, 59, 60, 61, 62, 63,
64, 65,
};
