https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106197
Bug ID: 106197
Summary: Ignoring error line then falls into infinite recursion
in constexpr function
Product: gcc
Version: 11.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: asd1366464124 at gmail dot com
Target Milestone: ---
Created attachment 53258
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53258&action=edit
wrong code that cause infinite recursion.
command line:g++11 -v -save-temps -Wall -Wextra -std=c++20 -fconstexpr-depth=10
a.cpp
output:
a.cpp: In function ‘consteval int fib(int)’:
a.cpp:5:5: error: ‘i’ was not declared in this scope
5 | i if constexpr (n == 0 || n == 1) return 1;
| ^
a.cpp: In function ‘int main()’:
a.cpp:11:27: in ‘constexpr’ expansion of ‘fib(1)’
a.cpp:6:15: in ‘constexpr’ expansion of ‘fib((n - 1))’
a.cpp:6:15: in ‘constexpr’ expansion of ‘fib((n - 1))’
a.cpp:6:15: in ‘constexpr’ expansion of ‘fib((n - 1))’
a.cpp:6:15: in ‘constexpr’ expansion of ‘fib((n - 1))’
a.cpp:6:15: in ‘constexpr’ expansion of ‘fib((n - 1))’
a.cpp:6:15: in ‘constexpr’ expansion of ‘fib((n - 1))’
a.cpp:6:15: in ‘constexpr’ expansion of ‘fib((n - 1))’
a.cpp:6:15: in ‘constexpr’ expansion of ‘fib((n - 1))’
a.cpp:6:15: in ‘constexpr’ expansion of ‘fib((n - 1))’
a.cpp:6:15: in ‘constexpr’ expansion of ‘fib((n - 1))’
a.cpp:11:27: error: ‘constexpr’ evaluation depth exceeds maximum of 10 (use
‘-fconstexpr-depth=’ to increase the maximum)
11 | constexpr auto i = fib(1);
| ~~~^~~
