On 9/15/2021 9:31 AM, Jason Merrill via Gcc-patches wrote:
Most any compilation on ARM/AArch64 was warning because the default L1 cache
line size of 32B was smaller than the default
std::hardware_constructive_interference_size of 64B. This is mostly due to
inaccurate --param l1-cache-line-size, but it's not helpful to complain to a
user that didn't set the values.
gcc/cp/ChangeLog:
* decl.c (cxx_init_decl_processing): Only warn about odd
interference sizes if they were specified with --param.
I wonder if that'll fix the arm-linux build failures that started
showing up recently:
armeb-linux-gnueabi:
<built-in>: error: '--param constructive-interference-size=64' is
greater than '--param l1-cache-line-size=32' [-Werror=interference-size]
I expect the other arm- linux configurations would show it as well, but
they're only run once a week in my tester and I don't think they've been
run since the recent changes in this space.
jeff
