https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111415
stephematician <stephematician.acct at proton dot me> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |stephematician.acct@proton.
| |me
--- Comment #3 from stephematician <stephematician.acct at proton dot me> ---
I encountered what I believe is the same bug while compiling an R package for
CRAN.
I reduced the code to the following example which produces errors on 12.4,
13.1-13.3, 14.1-14.2.
An array-bounds warning occurs with -O1, -O2, and -O3, but not with -Os.
Compiled with flags: -fpic -std=c++20 -Wall
#include <cstddef>
#include <vector>
inline std::vector<double> adjust_pvalues(const std::vector<double> &
unadjusted) {
const size_t n_pvalue = unadjusted.size();
if (n_pvalue < 2) return unadjusted;
/* Include this line and -O1 thru to -O3 give warnings */
const std::vector<size_t> index(n_pvalue);
/* NOTE: Can eliminate warning by removing second argument */
std::vector<double> adjusted(n_pvalue, 0.0);
return adjusted;
}
int main(int argc, char ** argv) {
std::vector<double> x(2);
x = adjust_pvalues(x);
return 0;
}
The above snippet is currently available on godbolt:
https://godbolt.org/z/38nnaEcrf
