Introduced with: autotools.bbclass: Introduce CACHED_CONFIGUREVARS - openembedded-core - OpenEmbedded Core layer
https://git.openembedded.org/openembedded-core/commit/?id=e48fd42e047f46399828a074c5125a0ce9c3f56f

Used quite a bit:
❯ rg CACHED_CONFIGUREVARS -l
meta/recipes-kernel/lttng/lttng-tools_2.16.0.bb
meta/recipes-bsp/grub/grub-efi_2.14.bb
meta/recipes-multimedia/libtiff/tiff_4.7.2.bb
meta/classes-recipe/autotools.bbclass
meta/recipes-connectivity/openssh/openssh_10.5p1.bb
meta/recipes-multimedia/mpg123/mpg123_1.33.7.bb
meta/recipes-support/libunwind/libunwind_1.8.3.bb
meta/recipes-support/apr/apr_1.7.6.bb
meta/recipes-support/gpgme/gpgme_2.1.2.bb
meta/recipes-support/gdbm/gdbm_1.26.bb
meta/classes/terminal.bbclass
meta/recipes-core/ncurses/ncurses.inc
meta/recipes-core/glibc/glibc.inc
meta/recipes-devtools/xmlto/xmlto_0.0.29.bb
meta/recipes-devtools/erofs-utils/erofs-utils_1.9.4.bb
meta/recipes-devtools/autoconf/autoconf_2.73.bb
meta/recipes-devtools/elfutils/elfutils_0.196.bb
meta/recipes-devtools/quilt/quilt.inc
meta/recipes-extended/mc/mc_4.8.33.bb
meta/recipes-devtools/rsync/rsync_3.5.1.bb
meta/recipes-devtools/libtool/libtool-2.6.2.inc
meta/recipes-devtools/libedit/libedit_20260512-3.1.bb
meta/recipes-extended/watchdog/watchdog_5.16.bb
meta/recipes-devtools/valgrind/valgrind_3.27.1.bb
meta/recipes-extended/cups/cups.inc
meta/recipes-devtools/automake/automake_1.19.bb
meta/recipes-devtools/bison/bison_3.8.2.bb
meta/recipes-extended/ltp/ltp_20260529.bb
meta/recipes-devtools/m4/m4-1.4.21.inc
meta/recipes-extended/sudo/sudo_1.9.17p2.bb
meta/recipes-devtools/e2fsprogs/e2fsprogs_1.47.4.bb
meta/recipes-extended/texinfo/texinfo_7.3.bb
meta/recipes-extended/tar/tar_1.35.bb
meta/recipes-devtools/python/python3_3.14.10.bb
meta/recipes-extended/shadow/shadow_4.20.2.bb
meta/recipes-extended/groff/groff_1.24.2.bb
meta/recipes-extended/bash/bash.inc
meta/recipes-extended/xz/xz_5.8.4.bb