fix: pyodide support by trying --version if -E fails

README.md

@@ -305,7 +305,7 @@ strict-config = true
 experimental = false
 
 # If set, this will provide a method for backward compatibility.
-minimum-version = "0.8"  # current version
+minimum-version = "0.9"  # current version
 
 # The build directory. Defaults to a temporary directory, but can be set.
 build-dir = ""

docs/changelog.md

@@ -1,10 +1,18 @@
 # Changelog
 
+## Version 0.9.1
+
+Quick fix for Pyodide (WebAssembly) builds.
+
+Fixes:
+
+- Try `--version` if `-E capabilities` fails by @henryiii in #717
+
 ## Version 0.9.0
 
 This version adds the ability to `inherit` in override tables, matching a
 similar feature added to cibuildwheel 2.17's overrides. You can now write out
-extra metadata to `@{SKBUILD_METADATA_DIR}`. A new Hatchling plugin is provided
+extra metadata to `${SKBUILD_METADATA_DIR}`. A new Hatchling plugin is provided
 as an experimental feature (will likely be made a separate package in the future
 like the setuptools plugin).
 
@@ -26,7 +34,7 @@ Fixes:
 
 - Exclude installed files if listed in exclude by @henryiii in #652
 - Make `.git_archival.txt` reproducible by @LecrisUT in #706
-- Use `cmake -E` capabilities instead of `cmake --version` by @KyleFromNVIDIA in
+- Use `cmake -E capabilities` instead of `cmake --version` by @KyleFromNVIDIA in
   #675
 - Ensure many/musl tags not selected by @henryiii in #698
 - purelib should set py3 tag if unset by @henryiii in #661

src/scikit_build_core/program_search.py

@@ -79,17 +79,40 @@
     """
     try:
         result = Run().capture(cmake_path, "-E", "capabilities")
-    except (subprocess.CalledProcessError, PermissionError):
-        return Program(cmake_path, None)
-
-    try:
-        version = Version(json.loads(result.stdout)["version"]["string"])
-    except (json.decoder.JSONDecodeError, KeyError, InvalidVersion):
-        logger.warning("Could not determine CMake version, got {!r}", result.stdout)
-        return Program(cmake_path, None)
-
-    logger.info("CMake version: {}", version)
-    return Program(cmake_path, version)
+        try:
+            version = Version(json.loads(result.stdout)["version"]["string"])
+            logger.info("CMake version: {}", version)
+            return Program(cmake_path, version)
+        except (json.decoder.JSONDecodeError, KeyError, InvalidVersion):
+            logger.warning("Could not determine CMake version, got {!r}", result.stdout)
+    except subprocess.CalledProcessError:
+        try:
+            result = Run().capture(cmake_path, "--version")
+            try:
+                version = Version(
+                    result.stdout.splitlines()[0].split()[-1].split("-")[0]
+                )
+                logger.info("CMake version via --version: {}", version)
+                return Program(cmake_path, version)
+            except (IndexError, InvalidVersion):
+                logger.warning(
+                    "Could not determine CMake version via --version, got {!r}",
+                    result.stdout,
+                )
+        except subprocess.CalledProcessError:
+            logger.warning(
+                "Could not determine CMake version via --version, got {!r} {!r}",
+                result.stdout,
+                result.stderr,
+            )
+    except PermissionError:
+        logger.warning(
+            "Permissions Error getting CMake's version, got {!r} {!r}",
+            result.stdout,
+            result.stderr,
+        )
+
+    return Program(cmake_path, None)
 
 
 def get_cmake_programs(*, module: bool = True) -> Generator[Program, None, None]: