On 07/10/2018 07:17 AM, Richard Biener wrote: > On Tue, Jul 10, 2018 at 3:06 PM Kugan Vivekanandarajah > <kugan.vivekanandara...@linaro.org> wrote: >> >> Hi, >> >> Jeff told me that the recent popcount built-in detection is causing >> kernel build issues as >> ERROR: "__popcountsi2" >> [drivers/net/wireless/broadcom/brcm80211/brcmfmac/brcmfmac.ko] undefined! >> >> I could also reproduce this. AFIK, we should check if the libfunc is >> defined while checking popcount? >> >> I am testing the attached RFC patch. Is this reasonable? > > It doesn't work that way, all targets have this libfunc in libgcc. This means > the kernel has to provide it. The only thing you could do is restrict > replacement of CALL_EXPRs (in SCEV cprop) to those the target > natively supports. I can certainly live with that, but I think we should reach out to the kernel developers to proactively make them aware of the requirement to provide popcount.
Jeff
