sbcl-bootstrap: new package (#46582)

Add pre-built sbcl for x86 and arm for various glibc versions, making
way for an actual sblc built from source.

Also switch to use set_env in a context manager over setting the
environment variable for the build environment. I hit an issue with the
build system due to this in the sbcl package, pre-empting the same issue
here.

var/spack/repos/builtin/packages/sbcl-bootstrap/package.py

@@ -0,0 +1,89 @@
+# Copyright 2013-2024 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)
+
+import platform
+
+from spack.package import *
+from spack.util.environment import set_env
+
+
+class SbclBootstrap(Package):
+    """Steel Bank Common Lisp (SBCL) is a high performance Common Lisp compiler.
+    It is open source / free software, with a permissive license. In addition
+    to the compiler and runtime system for ANSI Common Lisp, it provides an
+    interactive environment including a debugger, a statistical profiler, a
+    code coverage tool, and many other extensions.
+    """
+
+    homepage = "https://www.sbcl.org/"
+
+    maintainers("ashermancinelli")
+
+    # NOTE: The sbcl homepage lists
+    # while the sourceforge repo lists "Public Domain, MIT License", the
+    # COPYING file distributed with the source code contains this message:
+    #
+    # Thus, there are no known obstacles to copying, using, and modifying
+    # SBCL freely, as long as copyright notices of MIT, Symbolics, Xerox and
+    # Gerd Moellmann are retained.
+    #
+    # MIT seems the most appropriate, but if we can add more context to this
+    # license message, then we should.
+    license("MIT", checked_by="ashermancinelli")
+
+    # By checking objdump -T of the sbcl binary in each prebuilt tarball, I
+    # found the latest reference to glibc for each version.
+    sbcl_releases = {
+        "2.3.11": {
+            "x86_64": "98784b04f68882b887984242eef73dbb092ec5c778dd536b2c60846715e03f3c",
+            "min_glibc": "2.34",
+        },
+        "2.0.11": {
+            "x86_64": "b7e61bc6b8d238f8878e660bc0635e99c2ea1255bfd6153d702fe9a00f8138fd",
+            "min_glibc": "2.28",
+        },
+        "1.4.16": {
+            "x86_64": "df3d905d37656a7eeeba72d703577afc94a21d756a4dde0949310200f82ce575",
+            "min_glibc": "2.14",
+        },
+        "1.4.2": {
+            "aarch64": "ddac6499f36c18ecbce9822a53ef3914c0def5276a457446a456c62999b16d36",
+            "min_glibc": "2.17",
+        },
+        "1.3.21": {
+            "x86_64": "c1c3e17e1857fb1c22af575941be5cd1d5444b462397b1b3c9f3877aee2e814b",
+            "min_glibc": "2.3",
+        },
+    }
+
+    os = platform.system().lower()
+    target = platform.machine().lower()
+
+    for ver in sbcl_releases:
+        if target in sbcl_releases[ver]:
+            version(ver, sha256=sbcl_releases[ver][target])
+            if "min_glibc" in sbcl_releases[ver]:
+                conflicts(
+                    "glibc@:{0}".format(sbcl_releases[ver]["min_glibc"]), when="@{0}".format(ver)
+                )
+
+    supported_sysinfo_msg = "linux x86_64 is the only supported platform"
+    for sysinfo in ["platform=darwin", "platform=windows", "target=ppc64le"]:
+        conflicts(sysinfo, msg=supported_sysinfo_msg)
+
+    def url_for_version(self, version):
+        if self.os != "linux":
+            return None
+        target = platform.machine().lower()
+        sbcl_targets = {"aarch64": "arm64", "x86_64": "x86-64"}
+        if target not in sbcl_targets:
+            return None
+        sbcl_url = "https://sourceforge.net/projects/sbcl/files/sbcl/{version}/sbcl-{version}-{target}-linux-binary.tar.bz2"
+        return sbcl_url.format(version=version, target=sbcl_targets[target])
+
+    def install(self, spec, prefix):
+        sh = which("sh")
+        with set_env(INSTALL_ROOT=self.spec.prefix):
+            sh("install.sh")