Add Ubuntu 22.04 as the new default on Power9 or later

Make Ubuntu 22.04 the new default, but it is built for Power9 or later
and the images SIGILL when run on earlier CPUs. So if we're on Power8 or
eariler fall back to 21.10.

Author: mpe

README.md

@@ -56,6 +56,7 @@ There are images for various toolchains, they are encoded in the distro name/ver
  - kernel.org gcc 9.3.0 `korg@9.3.0`
  - kernel.org gcc 8.1.0 `korg@8.1.0`
  - kernel.org gcc 5.5.0 `korg@5.5.0`
+ - Ubuntu 22.04 `ubuntu@22.04`
  - Ubuntu 21.10 `ubuntu@21.10`
  - Ubuntu 21.04 `ubuntu@21.04`
  - Ubuntu 20.04 `ubuntu@20.04`

build/Makefile

@@ -1,10 +1,20 @@
 all: help
 
 export FEDORA_LATEST := 35
-export UBUNTU_LATEST := 21.10
+export UBUNTU_LATEST := 22.04
+
+# If we're on ppc64le
+ifeq ($(shell uname -m),ppc64le)
+    # And we don't see ISA v3.0
+    ifeq ($(shell LD_SHOW_AUXV=1 /bin/true | grep "AT_HWCAP2:.*\barch_3_00\b"),)
+        # Then we can't use 22.04
+        UBUNTU_LATEST := 21.10
+    endif
+endif
 
 FEDORA_DISTROS := fedora@${FEDORA_LATEST} fedora@34 fedora@33 fedora@31 fedora
-UBUNTU_DISTROS := ubuntu@${UBUNTU_LATEST} ubuntu@21.04 ubuntu@20.04 ubuntu@18.04 ubuntu@16.04 ubuntu)
+# Sort is to elimiate duplicates if UBUNTU_LATEST == 21.10
+UBUNTU_DISTROS := $(sort ubuntu@${UBUNTU_LATEST} ubuntu@21.10 ubuntu@21.04 ubuntu@20.04 ubuntu@18.04 ubuntu@16.04 ubuntu)
 KORG_DISTROS := korg@11.1.0 korg@10.3.0 korg@9.3.0 korg@8.1.0 korg@5.5.0
 ALL_DISTROS := ${UBUNTU_DISTROS} ${KORG_DISTROS} ${FEDORA_DISTROS}
 DOCS_DISTRO := docs@${UBUNTU_LATEST}

build/ubuntu/packages.sh

@@ -22,7 +22,7 @@ if [[ "$machine" == "ppc64le" ]]; then
     PACKAGES+=" libmount-dev"
 
     # For the x86_64 container
-    if [[ "$VERSION_ID" == "21.10" ]]; then
+    if [[ "$major" -ge 21 ]]; then
         PACKAGES+=" crossbuild-essential-amd64"
     fi
 else