@ManMower : I applied https://git.enlightenment.org/core/efl.git/commit/?id=1d8a93aa78c13c9256ca20d7d47ec195efeccd4e and https://git.enlightenment.org/core/efl.git/commit/?id=6b1ab3cd9c7e19908690e9e913df7504cc8ae7c8 to 1.20.7 release, but the result is same as before: illegal instruction.
How to find the problem? I build the source under a chroot.

@raster: „this has worked for 15+ years. why does it now not work for you?”

Using -O2 only: illegal instruction error.
Weird.

Using -O2 -mtune=generic: illegal instruction error.
I'll try with -O2 only.

./x86_64-gnu-linux-gcc-8.1.0 -v
Using built-in specs.
COLLECT_GCC=./x86_64-gnu-linux-gcc-8.1.0
COLLECT_LTO_WRAPPER=/var/uhubuild/UBK3/amd64/chroot1/usr/bin/../libexec/gcc/x86_64-gnu-linux/8.1.0/lto-wrapper
Target: x86_64-gnu-linux
Configured with: /var/uhubuild/work/compile/configure --prefix=/usr --infodir=/usr/share/info --mandir=/usr/share/man --enable-languages=c,c++,objc,fortran --enable-targets=all --enable-checking=release --enable-shared --enable-threads=posix --enable-lto --enable-plugin --enable-libmpx --enable-libssp --enable-tls --enable-install-libiberty --disable-multilib --disable-libstdcxx-pch --disable-libunwind-exceptions --disable-werror --with-gnu-as --with-gnu-ld --with-system-zlib --with-arch-32=i686 --with-arch-64=k8 --with-cpu-32=i686 --with-cpu-64=k8 --with-tune=generic --build=x86_64-gnu-linux --host=x86_64-gnu-linux --target=x86_64-gnu-linux
Thread model: posix
gcc version 8.1.0 (GCC)

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