https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103465
--- Comment #28 from Tomas Kalibera <tomas.kalibera at gmail dot com> --- I've also tested the patch with GCC 10.3 (with several backports from gcc10 branch plus some minor fixes, https://svn.r-project.org/R-dev-web/trunk/WindowsBuilds/winutf8/ucrt3/toolchain_libs/mxe/plugins/gcc10/). I've built a cross-compiler and built R using it and ran the R regression testsuite (check-all), with -O2. No issues found. The same testsuite was previously triggering Bug 103274.