macdeploy: disable compression in macOS gen-sdk script

diff --git a/ci/test/01_base_install.sh b/ci/test/01_base_install.sh
index 9bb67aa5..a0f4164b 100755
--- a/ci/test/01_base_install.sh
+++ b/ci/test/01_base_install.sh
@@ -90,7 +90,7 @@ mkdir -p "${DEPENDS_DIR}/SDKs" "${DEPENDS_DIR}/sdk-sources"
 OSX_SDK_BASENAME="Xcode-${XCODE_VERSION}-${XCODE_BUILD_ID}-extracted-SDK-with-libcxx-headers"
 
 if [ -n "$XCODE_VERSION" ] && [ ! -d "${DEPENDS_DIR}/SDKs/${OSX_SDK_BASENAME}" ]; then
-  OSX_SDK_FILENAME="${OSX_SDK_BASENAME}.tar.gz"
+  OSX_SDK_FILENAME="${OSX_SDK_BASENAME}.tar"
   OSX_SDK_PATH="${DEPENDS_DIR}/sdk-sources/${OSX_SDK_FILENAME}"
   if [ ! -f "$OSX_SDK_PATH" ]; then
     ${CI_RETRY_EXE} curl --location --fail "${SDK_URL}/${OSX_SDK_FILENAME}" -o "$OSX_SDK_PATH"
diff --git a/contrib/guix/README.md b/contrib/guix/README.md
index 7f6b8232..aadc231e 100644
--- a/contrib/guix/README.md
+++ b/contrib/guix/README.md
@@ -37,7 +37,7 @@ You can then either point to the SDK using the `SDK_PATH` environment variable:
 
 ```sh
 # Extract the SDK tarball to /path/to/parent/dir/of/extracted/SDK/Xcode-<foo>-<bar>-extracted-SDK-with-libcxx-headers
-tar -C /path/to/parent/dir/of/extracted/SDK -xaf /path/to/Xcode-<foo>-<bar>-extracted-SDK-with-libcxx-headers.tar.gz
+tar -C /path/to/parent/dir/of/extracted/SDK -xaf /path/to/Xcode-<foo>-<bar>-extracted-SDK-with-libcxx-headers.tar
 
 # Indicate where to locate the SDK tarball
 export SDK_PATH=/path/to/parent/dir/of/extracted/SDK
diff --git a/contrib/macdeploy/README.md b/contrib/macdeploy/README.md
index 3cbf5b50..a4723861 100644
--- a/contrib/macdeploy/README.md
+++ b/contrib/macdeploy/README.md
@@ -51,8 +51,8 @@ path to `Xcode.app` (extracted in the previous stage) as the first argument.
 ./contrib/macdeploy/gen-sdk '/path/to/Xcode.app'
 ```
 
-The generated archive should be: `Xcode-15.0-15A240d-extracted-SDK-with-libcxx-headers.tar.gz`.
-The `sha256sum` should be `5aa41897b7f00abdaf1ece242dde3eb96a395746c09638b3a59720694712387d`.
+The generated archive should be: `Xcode-15.0-15A240d-extracted-SDK-with-libcxx-headers.tar`.
+The `sha256sum` should be `95b00dc41fa090747dc0a7907a5031a2fcb2d7f95c9584ba6bccdb99b6e3d498`.
 
 ## Deterministic macOS App Notes
 
diff --git a/contrib/macdeploy/gen-sdk b/contrib/macdeploy/gen-sdk
index f2693691..cf379292 100755
--- a/contrib/macdeploy/gen-sdk
+++ b/contrib/macdeploy/gen-sdk
@@ -2,9 +2,7 @@
 import argparse
 import plistlib
 import pathlib
-import sys
 import tarfile
-import gzip
 import os
 import contextlib
 
@@ -22,12 +20,12 @@ def run():
     parser = argparse.ArgumentParser(
         description=__doc__, formatter_class=argparse.RawTextHelpFormatter)
 
-    parser.add_argument('xcode_app', metavar='XCODEAPP', nargs=1)
-    parser.add_argument("-o", metavar='OUTSDKTGZ', nargs=1, dest='out_sdktgz', required=False)
+    parser.add_argument('xcode_app', metavar='XCODEAPP', type=pathlib.Path)
+    parser.add_argument("-o", metavar='OUTSDKTAR', dest='out_sdkt', type=pathlib.Path, required=False)
 
     args = parser.parse_args()
 
-    xcode_app = pathlib.Path(args.xcode_app[0]).resolve()
+    xcode_app = args.xcode_app.resolve()
     assert xcode_app.is_dir(), "The supplied Xcode.app path '{}' either does not exist or is not a directory".format(xcode_app)
 
     xcode_app_plist = xcode_app.joinpath("Contents/version.plist")
@@ -47,11 +45,7 @@ def run():
 
     out_name = "Xcode-{xcode_version}-{xcode_build_id}-extracted-SDK-with-libcxx-headers".format(xcode_version=xcode_version, xcode_build_id=xcode_build_id)
 
-    if args.out_sdktgz:
-        out_sdktgz_path = pathlib.Path(args.out_sdktgz_path)
-    else:
-        # Construct our own out_sdktgz if not specified on the command line
-        out_sdktgz_path = pathlib.Path("./{}.tar.gz".format(out_name))
+    out_sdkt_path = args.out_sdkt or pathlib.Path("./{}.tar".format(out_name))
 
     def tarfp_add_with_base_change(tarfp, dir_to_add, alt_base_dir):
         """Add all files in dir_to_add to tarfp, but prepend alt_base_dir to the files'
@@ -87,14 +81,13 @@ def run():
             tarfp.add("./usr/lib", recursive=True, filter=change_tarinfo_base)
             tarfp.add("./System/Library/Frameworks", recursive=True, filter=change_tarinfo_base)
 
-    print("Creating output .tar.gz file...")
-    with out_sdktgz_path.open("wb") as fp:
-        with gzip.GzipFile(fileobj=fp, mode='wb', compresslevel=9, mtime=0) as gzf:
-            with tarfile.open(mode="w", fileobj=gzf, format=tarfile.GNU_FORMAT) as tarfp:
-                print("Adding MacOSX SDK {} files...".format(sdk_version))
-                tarfp_add_with_base_change(tarfp, sdk_dir, out_name)
-    print("Done! Find the resulting gzipped tarball at:")
-    print(out_sdktgz_path.resolve())
+    print("Creating output .tar file...")
+    with out_sdkt_path.open("wb") as fp:
+        with tarfile.open(mode="w", fileobj=fp, format=tarfile.PAX_FORMAT) as tarfp:
+            print("Adding MacOSX SDK {} files...".format(sdk_version))
+            tarfp_add_with_base_change(tarfp, sdk_dir, out_name)
+    print("Done! Find the resulting tarball at:")
+    print(out_sdkt_path.resolve())
 
 if __name__ == '__main__':
     run()