Publish portable Darling runtime patch snapshot and testing tools

tools/build-riot-malloc-runtime.py

@@ -0,0 +1,48 @@
+#!/usr/bin/env python3
+"""Build an isolated optimized allocator and its native integrity check."""
+from pathlib import Path
+import shlex
+import subprocess
+import shutil
+
+root = Path(__file__).resolve().parent.parent
+build = root / "build/darling-src/build"
+component = build / "src/external/libmalloc"
+flags = {}
+for line in (component / "CMakeFiles/system_malloc_obj.dir/flags.make").read_text().splitlines():
+    if line.startswith("C_") and " = " in line:
+        key, value = line.split(" = ", 1)
+        flags[key] = shlex.split(value)
+resource_include = subprocess.check_output(["clang", "-print-resource-dir"], text=True).strip() + "/include"
+flags["C_INCLUDES"] = [resource_include if value.startswith("/usr/lib/clang/") and value.endswith("/include") else value for value in flags["C_INCLUDES"]]
+flags["C_INCLUDES"].append("-I" + str(root / "build/darling-src/src/startup/mldr/elfcalls"))
+link = shlex.split((component / "CMakeFiles/system_malloc.dir/link.txt").read_text())
+objects = [arg for arg in link if arg.startswith("CMakeFiles/system_malloc_obj.dir/") and arg.endswith(".o")]
+for original in objects:
+    name = Path(original).name.removesuffix(".o")
+    obj = root / ("build/riot-malloc-" + name + ".o")
+    extra = ["-DOS_VARIANT_NOTRESOLVED=1", "-DOS_VARIANT_RESOLVED=1"] if name == "nanov2_malloc.c" else []
+    subprocess.run(["clang", *flags["C_DEFINES"], *flags["C_INCLUDES"], *flags["C_FLAGS"],
+                    *extra, "-O2", "-fno-strict-aliasing", "-c",
+                    str(root / "build/darling-src/src/external/libmalloc/src" / name),
+                    "-o", str(obj)], check=True)
+    link[link.index(original)] = str(obj)
+link[link.index("-o") + 1] = str(root / "build/riot-libsystem_malloc.dylib")
+subprocess.run(link, cwd=component, check=True)
+candidate = root / "build/riot-malloc-check-runtime"
+candidate.mkdir(exist_ok=True)
+shutil.copy2(root / "build/riot-libsystem_malloc.dylib", candidate / "libsystem_malloc.dylib")
+
+probe_flags = {}
+for line in (build / "src/frameworks/CoreVideo/CMakeFiles/CoreVideo.dir/flags.make").read_text().splitlines():
+    if line.startswith("C_") and " = " in line:
+        key, value = line.split(" = ", 1)
+        probe_flags[key] = shlex.split(value)
+probe_flags["C_INCLUDES"] = [resource_include if value.startswith("/usr/lib/clang/") and value.endswith("/include") else value for value in probe_flags["C_INCLUDES"]]
+obj = root / "build/riot-malloc-integrity-check.o"
+subprocess.run(["clang", *probe_flags["C_DEFINES"], *probe_flags["C_INCLUDES"],
+                *probe_flags["C_FLAGS"], "-O2", "-c", str(root / "tools/riot-malloc-integrity-check.c"),
+                "-o", str(obj)], check=True)
+subprocess.run(["clang", "-target", "x86_64-apple-macosx11.0", "-fuse-ld=lld", "-nostdlib",
+                "-isysroot", "@DARLING_SDK@", str(obj), "-lSystem",
+                "-o", str(root / "build/riot-malloc-integrity-check")], check=True)