Selected part of the error log: ``` /var/tmp/portage/dev-qt/qtbase-6.5.1-r1/work/qtbase-everywhere-src-6.5.1_build/include/QtCore/../../../qtbase-everywhere-src-6.5.1/src/corelib/global/qfloat16.h: In function ‘qfloat16 qSqrt(qfloat16)’: /var/tmp/portage/dev-qt/qtbase-6.5.1-r1/work/qtbase-everywhere-src-6.5.1_build/include/QtCore/../../../qtbase-everywhere-src-6.5.1/src/corelib/global/qfloat16.h:266:9: error: ‘__m128h’ was not declared in this scope 266 | __m128h v = _mm_set_sh(f); | ^~~~~~~ /var/tmp/portage/dev-qt/qtbase-6.5.1-r1/work/qtbase-everywhere-src-6.5.1_build/include/QtCore/../../../qtbase-everywhere-src-6.5.1/src/corelib/global/qfloat16.h:267:9: error: ‘v’ was not declared in this scope 267 | v = _mm_sqrt_sh(v, v); | ^ /var/tmp/portage/dev-qt/qtbase-6.5.1-r1/work/qtbase-everywhere-src-6.5.1_build/include/QtCore/../../../qtbase-everywhere-src-6.5.1/src/corelib/global/qfloat16.h:267:13: error: ‘_mm_sqrt_sh’ was not declared in this scope 267 | v = _mm_sqrt_sh(v, v); | ^~~~~~~~~~~ /var/tmp/portage/dev-qt/qtbase-6.5.1-r1/work/qtbase-everywhere-src-6.5.1_build/include/QtCore/../../../qtbase-everywhere-src-6.5.1/src/corelib/global/qfloat16.h:268:16: error: ‘_mm_cvtsh_h’ was not declared in this scope 268 | return _mm_cvtsh_h(v); | ^~~~~~~~~~~ ``` Reproducible: Always Steps to Reproduce: 1. Use an AVX512-enabled Intel Alder Lake (12th gen Core) machine 2. Set "march=native" in gcc flags Actual Results: Emerge failed Suspected Cause: in qtbase-6.5.1-r1/work/qtbase-everywhere-src-6.5.1/src/corelib/global/qfloat16.h:29: ``` #if defined(QT_COMPILER_SUPPORTS_F16C) && defined(__F16C__) #include <immintrin.h> #endif ``` Somehow QT_COMPILER_SUPPORTS_F16C is undef on my machine. When commented out, the manual build turns out successful Background: Alder Lake CPUs (or Intel 12th gen Core) do not officially support AVX512. However, a CooperLake-equivalent AVX512 support can be enabled on those CPUs by specific firmwares. Hence a very niche configuration.
Created attachment 865565 [details] lscpu
Created attachment 865566 [details] emerge --info
Created attachment 865567 [details] build.log
Created attachment 865568 [details] environment
Created attachment 865569 [details] gcc -march=native -Q --help=target
Created attachment 865570 [details] emerge --info '=dev-qt/qtbase-6.5.1-r1::gentoo'
Supplementary Info: I'm not using any
(In reply to znjameswu from comment #7) Supplementary Info: I'm not using VirtualBox. The installation is on bare metal.
Please file a bug upstream.
