Disable WebAssembly tests on Ubuntu 20.04: libc is too old for LLVM 19

Author: jmillikin

tests/scripts/run_tests.sh

@@ -16,15 +16,19 @@
 set -euo pipefail
 
 toolchain_name=""
+disable_wasm_tests=""
 
-while getopts "t:h" opt; do
+while getopts "t:hW" opt; do
   case "${opt}" in
   "t") toolchain_name="${OPTARG}" ;;
   "h")
     echo "Usage:"
     echo "-t - Toolchain name to use for testing; default is llvm_toolchain"
     exit 2
     ;;
+  "W")
+    disable_wasm_tests="yes"
+    ;;
   *)
     echo "invalid option: -${OPTARG}"
     exit 1
@@ -68,7 +72,7 @@ fi
 # to run out of disk space.
 #
 # Mitigate this by expunging the workspace before trying to build Wasm targets.
-if [[ -z ${toolchain_name} ]]; then
+if [[ -z ${toolchain_name} && -z ${disable_wasm_tests} ]]; then
   # Redefine `test_args` without `--linkopt=-Wl,-v`, which breaks `wasm-ld`.
   #
   # https://github.com/llvm/llvm-project/issues/112836

tests/scripts/ubuntu_20_04_test.sh

@@ -34,8 +34,12 @@ apt-get -qq -y install apt-utils curl libtinfo5 libxml2 pkg-config zlib1g-dev >/
 # The above command gives some verbose output that can not be silenced easily.
 # https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=288778
 
+# The WebAssembly tests use an LLVM version that is too new for the GNU libc
+# distributed in Ubuntu 20.04.
+disable_wasm_tests='-W'
+
 # Run tests
 cd /src
-tests/scripts/run_tests.sh
+tests/scripts/run_tests.sh $${disable_wasm_tests}
 """
 done