WIP adding support for cpython build_option

python/private/py_exec_tools_toolchain.bzl

@@ -43,7 +43,7 @@ py_exec_tools_toolchain = rule(
 Provides a toolchain for build time tools.
 
 This provides `ToolchainInfo` with the following attributes:
-* `exec_tools`: {type}`PyExecToolsInfo` 
+* `exec_tools`: {type}`PyExecToolsInfo`
 * `toolchain_label`: {type}`Label` _only present when `--visibile_for_testing=True`
   for internal testing_. The rule's label; this allows identifying what toolchain
   implmentation was selected for testing purposes.

python/private/python_register_toolchains.bzl

@@ -109,35 +109,37 @@ def python_register_toolchains(
         if not sha256:
             continue
 
+        build_option = tool_versions[python_version].get("build_option", None)
         loaded_platforms.append(platform)
-        (release_filename, urls, strip_prefix, patches, patch_strip) = get_release_info(platform, python_version, base_url, tool_versions)
+        (release_filename, urls, strip_prefix, patches, patch_strip, free_threading) = get_release_info(
+            platform, python_version, base_url, tool_versions, build_option=build_option
+        )
 
+        build_opt_str = ("_" + build_option.replace("+", "-")) if build_option else ""
+        name_with_build_opt = "{name}{build_opt}".format(
+            name = name,
+            build_opt = build_opt_str
+        )
         # allow passing in a tool version
         coverage_tool = None
         coverage_tool = tool_versions[python_version].get("coverage_tool", {}).get(platform, None)
         if register_coverage_tool and coverage_tool == None:
             coverage_tool = coverage_dep(
                 name = "{name}_{platform}_coverage".format(
-                    name = name,
+                    name = name_with_build_opt,
                     platform = platform,
                 ),
                 python_version = python_version,
                 platform = platform,
                 visibility = ["@{name}_{platform}//:__subpackages__".format(
-                    name = name,
+                    name = name_with_build_opt,
                     platform = platform,
                 )],
             )
 
-        flag_values = tool_versions[python_version].get("flag_values", None)
-        free_threading_label = "@rules_python//python/config_settings:free_threading"
-        free_threading = False
-        if flag_values:
-            free_threading = flag_values.get(free_threading_label, False) == "yes"
-        suffix = tool_versions[python_version].get("suffix", "")
         python_repository(
             name = "{name}_{platform}".format(
-                name = name,
+                name = name_with_build_opt,
                 platform = platform,
             ),
             sha256 = sha256,
@@ -166,12 +168,12 @@ def python_register_toolchains(
                 platform = platform,
             ))
 
-    host_toolchain(name = name + "_host")
+    host_toolchain(name = name_with_build_opt + "_host")
 
     toolchain_aliases(
         name = name,
         python_version = python_version,
-        user_repository_name = name,
+        user_repository_name = name_with_build_opt,
         platforms = loaded_platforms,
     )
 
@@ -183,5 +185,5 @@ def python_register_toolchains(
         name = toolchain_repo_name,
         python_version = python_version,
         set_python_version_constraint = set_python_version_constraint,
-        user_repository_name = name,
+        user_repository_name = name_with_build_opt,
     )

python/private/python_repository.bzl

@@ -127,11 +127,11 @@ def _python_repository_impl(rctx):
         for patch in patches:
             rctx.patch(patch, strip = rctx.attr.patch_strip)
 
+    ft_postfix = "t" if free_threading else ""
     # Write distutils.cfg to the Python installation.
     if "windows" in platform:
         distutils_path = "Lib/distutils/distutils.cfg"
     else:
-        ft_postfix = "t" if free_threading else ""
         distutils_path = "lib/python{}{}/distutils/distutils.cfg".format(python_short_version, ft_postfix)
     if rctx.attr.distutils:
         rctx.file(distutils_path, rctx.read(rctx.attr.distutils))
@@ -145,7 +145,7 @@ def _python_repository_impl(rctx):
         # dyld lookup errors. To fix, set the full path to the dylib as
         # it appears in the Bazel workspace as its LC_ID_DYLIB using
         # the `install_name_tool` bundled with macOS.
-        dylib = "libpython{}.dylib".format(python_short_version)
+        dylib = "libpython{}{}.dylib".format(python_short_version, ft_postfix)
         repo_utils.execute_checked(
             rctx,
             op = "python_repository.FixUpDyldIdPath",

python/versions.bzl

@@ -703,20 +703,28 @@ PLATFORMS = {
     ),
 }
 
-def get_release_info(platform, python_version, base_url = DEFAULT_RELEASE_BASE_URL, tool_versions = TOOL_VERSIONS):
+def get_release_info(
+    platform, python_version, base_url = DEFAULT_RELEASE_BASE_URL, tool_versions = TOOL_VERSIONS, build_option = None
+):
     """Resolve the release URL for the requested interpreter version
 
     Args:
         platform: The platform string for the interpreter
         python_version: The version of the interpreter to get
         base_url: The URL to prepend to the 'url' attr in the tool_versions dict
         tool_versions: A dict listing the interpreter versions, their SHAs and URL
+        build_option: Python build option, default: "install_only"
 
     Returns:
-        A tuple of (filename, url, archive strip prefix, patches, patch_strip)
+        A tuple of (filename, url, archive strip prefix, patches, patch_strip, free_threading)
     """
 
     url = tool_versions[python_version]["url"]
+    if not build_option:
+        build_option = "shared-install_only" if (WINDOWS_NAME in platform) else "install_only"
+        free_threading = False
+    else:
+        free_threading = True if build_option.startswith("freethreaded") else False
 
     if type(url) == type({}):
         url = url[platform]
@@ -734,7 +742,7 @@ def get_release_info(platform, python_version, base_url = DEFAULT_RELEASE_BASE_U
         release_filename = u.format(
             platform = platform,
             python_version = python_version,
-            build = "shared-install_only" if (WINDOWS_NAME in platform) else "install_only",
+            build = build_option,
         )
         if "://" in release_filename:  # is absolute url?
             rendered_urls.append(release_filename)
@@ -757,7 +765,7 @@ def get_release_info(platform, python_version, base_url = DEFAULT_RELEASE_BASE_U
         else:
             patch_strip = None
 
-    return (release_filename, rendered_urls, strip_prefix, patches, patch_strip)
+    return (release_filename, rendered_urls, strip_prefix, patches, patch_strip, free_threading)
 
 def print_toolchains_checksums(name):
     native.genrule(