Add Spack-based CI

.github/workflows/Spack_Linux.yml

@@ -0,0 +1,68 @@
+# This is a CI workflow for the NCEPLIBS-ip project.
+#
+# This workflow builds ip with Spack, including installing with the "--test
+# root" option to run the CTest suite. It also has a one-off job that validates
+# the recipe by ensuring that every CMake option that should be set in the
+# Spack recipe is so set.
+#
+# Alex Richert, Sep 2023
+name: Spack
+on:
+  push:
+    branches:
+    - develop
+  pull_request:
+    branches:
+    - develop
+
+jobs:
+  # This job builds with Spack using every combination of variants and runs the CTest suite each time
+  Linux:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        openmp: ["+openmp", "~openmp"]
+        sharedlibs: ["+shared", "~shared"]
+        pic: ["+pic", "~pic"]
+        precision: ["precision=d", "precision=4", "precision=8"]
+
+    steps:
+
+    - name: checkout-ip
+      uses: actions/checkout@v4
+      with: 
+        path: ip
+
+    - name: spack-build-and-test
+      run: |
+        git clone -c feature.manyFiles=true https://github.com/spack/spack
+        . spack/share/spack/setup-env.sh
+        spack env create ip-env
+        spack env activate ip-env
+        cp $GITHUB_WORKSPACE/ip/spack/package.py $SPACK_ROOT/var/spack/repos/builtin/packages/ip/package.py
+        mv $GITHUB_WORKSPACE/ip $SPACK_ENV/ip
+        spack develop --no-clone ip@develop
+        spack add ip@develop%gcc@11 ${{ matrix.openmp }} ${{ matrix.sharedlibs }} ${{ matrix.pic }} ${{ matrix.precision }}
+        spack external find cmake gmake
+        spack concretize
+        spack install --verbose --test root
+
+  # This job validates the Spack recipe by making sure each cmake build option is represented
+  recipe-check:
+    runs-on: ubuntu-latest
+
+    steps:
+
+    - name: checkout-ip
+      uses: actions/checkout@v4
+      with: 
+        path: ip
+
+    - name: recipe-check
+      run: |
+        echo "If this jobs fails, look at the most recently output CMake option below and make sure that option appears in spack/package.py"
+        for opt in $(grep -ioP '^option\(\K(?!(ENABLE_DOCS))[^ ]+' $GITHUB_WORKSPACE/ip/CMakeLists.txt) ; do
+          echo "Checking for presence of '$opt' CMake option in package.py"
+          grep -cP "define.+\b${opt}\b" $GITHUB_WORKSPACE/ip/spack/package.py
+        done

CMakeLists.txt

@@ -19,7 +19,6 @@ option(BUILD_SHARED_LIBS "Build shared libraries" OFF)
 option(BUILD_4 "Build the 4-byte real version of the library, libip_4.a" ON)
 option(BUILD_D "Build the 8-byte real version of the library, libip_d.a" ON)
 option(BUILD_8 "Build the 8-byte integer version of the library, libsp_8.a" OFF)
-option(BUILD_TESTING "Build tests of the library" ON)
 
 # Figure whether user wants a _4, a _d, and/or _8.
 if(BUILD_4)

spack/README

@@ -0,0 +1,3 @@
+This directory contains an authoritative, up-to-date Spack recipe for NCEPLIBS-ip, which is found under Spack as "ip".
+
+Before each release of NCEPLIBS-ip, this file should be updated to accommodate changes in build options, etc., and .github/workflows/spack.yml should be updated to exercise all variants. Only the version entry should need to be updated after the release prior to incorporation into the Spack repository and the JCSDA Spack fork.

spack/package.py

@@ -0,0 +1,84 @@
+# Copyright 2013-2023 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack.package import *
+
+
+class Ip(CMakePackage):
+    """The NCEP general interpolation library (iplib) contains Fortran 90
+    subprograms to be used for interpolating between nearly all grids used at
+    NCEP. This is part of the NCEPLIBS project."""
+
+    homepage = "https://noaa-emc.github.io/NCEPLIBS-ip"
+    url = "https://github.com/NOAA-EMC/NCEPLIBS-ip/archive/refs/tags/v3.3.3.tar.gz"
+
+    maintainers("t-brown", "AlexanderRichert-NOAA", "edwardhartnett", "Hang-Lei-NOAA")
+
+    version("4.1.0", sha256="b83ca037d9a5ad3eb0fb1acfe665c38b51e01f6bd73ce9fb8bb2a14f5f63cdbe")
+    version("4.0.0", sha256="a2ef0cc4e4012f9cb0389fab6097407f4c623eb49772d96eb80c44f804aa86b8")
+    version(
+        "3.3.3",
+        sha256="d5a569ca7c8225a3ade64ef5cd68f3319bcd11f6f86eb3dba901d93842eb3633",
+        preferred=True,
+    )
+
+    variant("openmp", description="Enable OpenMP threading", default=True)
+    variant("pic", default=True, description="Build with position-independent-code")
+    variant("shared", default=False, description="Build shared library", when="@4.1:")
+    variant(
+        "precision",
+        default=["4", "d"],
+        values=["4", "d"],
+        multi=True,
+        description="Set precision (_4/_d library versions)",
+        when="@4.1:",
+    )
+    variant(
+        "precision",
+        default=["4", "d"],
+        values=["4", "d", "8"],
+        multi=True,
+        description="Set precision (_4/_d/_8 library versions)",
+        when="@develop",
+    )
+
+    depends_on("sp")
+    depends_on("sp@:2.3.3", when="@:4.0")
+    depends_on("sp precision=4", when="@4.1: precision=4")
+    depends_on("sp precision=d", when="@4.1: precision=d")
+    depends_on("sp precision=8", when="@4.1: precision=8")
+
+    def cmake_args(self):
+        args = [
+            self.define_from_variant("OPENMP", "openmp"),
+            self.define_from_variant("CMAKE_POSITION_INDEPENDENT_CODE", "pic"),
+        ]
+
+        if self.spec.satisfies("@4:"):
+            args.append(self.define("ENABLE_TESTS", self.run_tests))
+
+        if self.spec.satisfies("@4.1:"):
+            args.append(self.define_from_variant("BUILD_SHARED_LIBS", "shared"))
+            args.append(self.define("BUILD_4", self.spec.satisfies("precision=4")))
+            args.append(self.define("BUILD_D", self.spec.satisfies("precision=d")))
+
+        if self.spec.satisfies("@develop"):
+            args.append(self.define("BUILD_8", self.spec.satisfies("precision=8")))
+
+        return args
+
+    def setup_run_environment(self, env):
+        suffixes = (
+            self.spec.variants["precision"].value
+            if self.spec.satisfies("@4.1:")
+            else ["4", "8", "d"]
+        )
+        shared = False if self.spec.satisfies("@:4.0") else self.spec.satisfies("+shared")
+        for suffix in suffixes:
+            lib = find_libraries(
+                "libip_" + suffix, root=self.prefix, shared=shared, recursive=True
+            )
+            env.set("IP_LIB" + suffix, lib[0])
+            env.set("IP_INC" + suffix, join_path(self.prefix, "include_" + suffix))