Created attachment 922368 [details] build.log See the logs.
Created attachment 922369 [details] emerge --info
A closer look to the logs led me to think that those flags: -march=armv7-a -mfpu=neon-vfpv4 -mfloat-abi=hard are generated by this snippet of the CMakeLists.txt https://github.com/google/highway/blob/99bb05378be47b4c21baef4c8ff0db831a2a88f1/CMakeLists.txt#L432C7-L432C21 So HWY_CMAKE_ARM7 which is turned on by the ebuild in multilib_src_configure(). And so it is trying to compile for armv7-a instead of armv8-a. This behaviour is kinda bad since it doesn't take account for aarch64.
Potentially relevant upstream issue: https://github.com/google/highway/issues/2234 I'll note I've been unable to get the suggested workaround to work, though.
As I tried to explain, the "-mfpu=neon-vfpv4" won't work for aarch64 since it doesn't exists. "-mfloat-abi=hard" also doesn't seems to exists at all. "-march=armv7-a" is also wrong since the current arch is armv8-a or anything newer. See: https://gcc.gnu.org/onlinedocs/gcc/AArch64-Options.html But the compiler should use neon on aarch64 even though there's no compiler flag for it. So the actual fix would be to turn off the cpu_flags_arm_neon completly for aarch64 for dev-cpp/highway. I guess this should be done in the ebuild.
(In reply to benoit.dufour from comment #4) > As I tried to explain, the "-mfpu=neon-vfpv4" won't work for aarch64 since > it doesn't exists. Often, a patch with commentary is helpful in getting the point across. Anyway, indeed, this is another case of cpu_flags_arm_neon being wrong on 64-bit.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=1eb26dea6ba2aae4991a0e0fe417fc171f2f5428 commit 1eb26dea6ba2aae4991a0e0fe417fc171f2f5428 Author: Sam James <sam@gentoo.org> AuthorDate: 2025-04-30 22:10:37 +0000 Commit: Sam James <sam@gentoo.org> CommitDate: 2025-04-30 22:10:58 +0000 profiles/arch/arm64: mask dev-cpp/highway[cpu_flags_arm_neon] It's for 32-bit only. Closes: https://bugs.gentoo.org/951981 Signed-off-by: Sam James <sam@gentoo.org> profiles/arch/arm64/package.use.mask | 4 ++++ 1 file changed, 4 insertions(+)
