Hardcode support for platform pyodide_wasm32

I don't like it; this feels like a hack, but it works, and I would be
happy to get more guidance.

Also one weird thing, is if I installl pywavelets nightly, it installs
numpy stable; while the index does have a numpy nightly;

And with the same config, if I ask it to install numpy; it does install
numpy nightly.

So there is something wonkey in recursive dependency handling of
indexes.

CHANGELOG.md

@@ -4,6 +4,13 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+
+### Fixed
+
+ - Fix a bug that prevented some wasm32 wheel to be recognized as compatible with pyodide
+  [#159](https://github.com/pyodide/micropip/pull/159)
+
 ## [0.7.1] - 2024/11/11
 
 ### Fixed

micropip/_utils.py

@@ -2,7 +2,7 @@
 import json
 from importlib.metadata import Distribution
 from pathlib import Path
-from sysconfig import get_platform
+from sysconfig import get_config_var, get_platform
 
 from packaging.requirements import Requirement
 from packaging.tags import Tag
@@ -62,8 +62,15 @@ def get_files_in_distribution(dist: Distribution) -> set[Path]:
 
 
 @functools.cache
-def sys_tags() -> list[Tag]:
-    return list(sys_tags_orig())
+def sys_tags() -> tuple[Tag, ...]:
+    new_tags = []
+    abi_version = get_config_var("PYODIDE_ABI_VERSION")
+    pyodide_platform_tag = f"pyodide_{abi_version}_wasm32"
+    for tag in sys_tags_orig():
+        if "emscripten" in tag.platform:
+            new_tags.append(Tag(tag.interpreter, tag.abi, pyodide_platform_tag))
+        new_tags.append(tag)
+    return tuple(new_tags)
 
 
 @functools.cache

micropip/package_index.py

@@ -214,6 +214,9 @@ def _fast_check_incompatibility(filename: str) -> bool:
     if not filename.endswith(".whl"):
         return False
 
+    if filename.endswith("wasm32.whl") and sys.platform == "emscripten":
+        return True
+
     if sys.platform not in filename and not filename.endswith("-none-any.whl"):
         return False