As a reference, the following case works as expected on Fedora rawhide.
```
<mock-chroot> sh-5.0# rpm -q rpm
rpm-4.16.0-0.beta3.2.fc33.3.x86_64
<mock-chroot> sh-5.0# rpm -q redhat-rpm-config
redhat-rpm-config-166-1.fc33.noarch
<mock-chroot> sh-5.0# rpm --define 'toolchain gcc' --eval '%{optflags}'
-O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches
-pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2
-Wp,-D_GLIBCXX_ASSERTIONS
-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1
-fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1
-m64 -mtune=generic -fasynchronous-unwind-tables
-fstack-clash-protection -fcf-protection
<mock-chroot> sh-5.0# rpm --define 'toolchain clang' --eval '%{optflags}'
-O2 -flto -fexceptions -g -grecord-gcc-switches -pipe -Wall
-Werror=format-security -Wp,-D_FORTIFY_SOURCE=2
-Wp,-D_GLIBCXX_ASSERTIONS --config
/usr/lib/rpm/redhat/redhat-hardened-clang.cfg -fstack-protector-strong
-m64 -mtune=generic -fasynchronous-unwind-tables -fcf-protection
```
--
Jun | He - His - Him
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