Adding separate spack file for ubuntu 20

Author: victorapm

docker/tpl-ubuntu-clang-cuda.Dockerfile

@@ -63,7 +63,7 @@ RUN --mount=src=.,dst=$SRC_DIR,readwrite cd ${SRC_DIR} && \
      mkdir -p ${GEOSX_TPL_DIR} && \
      ./scripts/uberenv/uberenv.py \
        --spec "+cuda~uncrustify~openmp~pygeosx cuda_arch=70 %clang-10  ^[email protected]+allow-unsupported-compilers ^caliper~gotcha~sampler~libunwind~libdw~papi" \
-       --spack-env-file=${SRC_DIR}/docker/spack.yaml \
+       --spack-env-file=${SRC_DIR}/docker/ubuntu20-spack.yaml \
        --project-json=.uberenv_config.json \
        --prefix ${GEOSX_TPL_DIR} \
        -k && \

docker/ubuntu20-spack.yaml

@@ -0,0 +1,163 @@
+spack:
+  config:
+    install_tree:
+      root: $spack/..
+      projections:
+        all: '{compiler.name}-{compiler.version}/{name}-{version}-{hash}'
+    misc_cache: $spack/../misc_cache
+    test_stage: $spack/../test_stage
+    build_stage::
+    - $spack/../build_stage
+
+  # Regular TPLs do not need views
+  view: false
+
+  # Include shared variants and versions
+  include:
+  - ../defaults.yaml
+  - ../versions.yaml
+
+  # Ubuntu 20.04 clang/cuda image only has clang/llvm 10.x available.
+  # Keep this environment llvm10-only to avoid concretizer conflicts with llvm@15.
+  toolchains:
+    clang-10:
+      - spec: '%[virtuals=c][email protected]+clang~flang~lld~lldb'
+        when: '%c'
+      - spec: '%[virtuals=cxx][email protected]+clang~flang~lld~lldb'
+        when: '%cxx'
+      - spec: '%[virtuals=fortran][email protected]'
+        when: '%fortran'
+      - spec: '%openmpi'
+        when: '%mpi'
+
+  packages:
+    all:
+      target: [x86_64]
+
+    mpi:
+      require:
+      - openmpi
+
+    blas:
+      require:
+      - "netlib-lapack"
+    lapack:
+      require:
+      - "netlib-lapack"
+
+    llvm:
+      externals:
+      - spec: [email protected]+clang~flang~lld~lldb
+        prefix: /usr
+        extra_attributes:
+          compilers:
+            c: /usr/bin/clang
+            cxx: /usr/bin/clang++
+
+    gcc:
+      externals:
+      - spec: [email protected] languages:='c,c++,fortran'
+        prefix: /usr
+        extra_attributes:
+          compilers:
+            c: /usr/bin/gcc-9
+            cxx: /usr/bin/g++-9
+            fortran: /usr/bin/gfortran-9
+
+    # CUDA comes from the nvidia base image.
+    cuda:
+      buildable: False
+      externals:
+      - spec: [email protected] +allow-unsupported-compilers
+        prefix: /usr/local/cuda
+
+    # Use system OpenMPI, but tag it as llvm@10-built so it can satisfy %clang-10 DAGs.
+    # (Spack does not validate the actual compiler used for system packages.)
+    openmpi:
+      externals:
+      - spec: [email protected] %[email protected]
+        prefix: /usr
+
+    autoconf:
+      version: [2.71]
+      buildable: false
+      externals:
+      - spec: [email protected]
+        prefix: /usr
+    automake:
+      version: [1.16.5]
+      buildable: false
+      externals:
+      - spec: [email protected]
+        prefix: /usr
+    cmake:
+      version: [3.28.3]
+      buildable: false
+      externals:
+      - spec: [email protected]
+        prefix: /usr/local
+
+    findutils:
+      version: [4.7.0]
+      buildable: false
+      externals:
+      - spec: [email protected]
+        prefix: /usr
+    m4:
+      buildable: false
+      externals:
+      - spec: [email protected]
+        prefix: /usr
+    mpfr:
+      buildable: false
+      externals:
+      - spec: [email protected]
+        prefix: /usr
+
+    netlib-lapack:
+      buildable: false
+      externals:
+      - spec: [email protected]
+        prefix: /usr
+    netlib-blas:
+      buildable: false
+      externals:
+      - spec: [email protected]
+        prefix: /usr
+
+    perl:
+      buildable: false
+      externals:
+      - spec: [email protected]
+        prefix: /usr
+    pkg-config:
+      buildable: false
+      externals:
+      - spec: [email protected]
+        prefix: /usr
+    python:
+      buildable: false
+      externals:
+      - spec: [email protected]
+        prefix: /usr
+    tar:
+      buildable: false
+      externals:
+      - spec: [email protected]
+        prefix: /usr
+    unzip:
+      buildable: false
+      externals:
+      - spec: [email protected]
+        prefix: /usr
+    xz:
+      buildable: false
+      externals:
+      - spec: [email protected]
+        prefix: /usr
+    zlib:
+      buildable: false
+      externals:
+      - spec: [email protected]
+        prefix: /usr
+