$ which emerge
+/usr/bin/emerge
+

$ which emerge
+/usr/local/bin/emerge
+

$ echo $PATH
+/usr/local/sbin:/usr/local/bin:/usr/bin:/opt/bin:/usr/lib/llvm/18/bin:/usr/lib/llvm/17/bin
+

#!/usr/bin/env bash
+#
+# Script checking that binhost path exists before running emerge and
+# creating it if not exists
+
+PROFILE=$(eselect profile show|sed -n 2p|cut -d '/' -f4)
+GCC_VERSION=$(eselect gcc show|cut -d '-' -f5)
+BINHOST_DIR="/var/cache/binpkgs/${PROFILE}/gcc-${GCC_VERSION}.x/armv8a"
+
+if [ ! -d "${BINHOST_DIR}" ]; then
+        echo "${BINHOST_DIR} does not exist, creating"
+        mkdir -p "${BINHOST_DIR}"
+else echo "Binhost directory ${BINHOST_DIR} exists, proceeding with emerge ..."
+fi
+
+PKGDIR="${BINHOST_DIR}" /usr/bin/emerge "$@"
+

$ tree -L 3 /var/cache/binpkgs/
+/var/cache/binpkgs/
+├── 17.0
+│   └── gcc-13.x
+│       └── armv8a
+└── 23.0
+    ├── gcc-13.x
+    │   └── armv8a
+    └── gcc-14.x
+        └── armv8a
+

Automatically creating new binhost directories when profile or gcc version changes¶