ci: run pyo3-ffi-check using nox

.github/workflows/build.yml

@@ -128,17 +128,13 @@ jobs:
               - '.github/workflows/ci.yml'
               - '.github/workflows/build.yml'
 
-      - run: cargo doc -p pyo3-ffi
-        working-directory: pyo3-ffi-check
-        if: ${{ steps.ffi-changes.outputs.changed == 'true' && inputs.rust == 'stable' && inputs.python-version != 'pypy-3.7' && inputs.python-version != 'pypy-3.8' }}
-
       - name: Run pyo3-ffi-check
-        run: cargo run
-        working-directory: pyo3-ffi-check
+        run: nox -s ffi-check
         # Allow failure on PyPy for now
         continue-on-error: ${{ startsWith(inputs.python-version, 'pypy') }}
         if: ${{ steps.ffi-changes.outputs.changed == 'true' && inputs.rust == 'stable' && inputs.python-version != 'pypy-3.7' && inputs.python-version != 'pypy-3.8' }}
 
+
       - name: Test cross compilation
         if: ${{ inputs.os == 'ubuntu-latest' && inputs.python-version == '3.9' }}
         uses: PyO3/maturin-action@v1

Cargo.toml

@@ -158,6 +158,8 @@ harness = false
 [workspace]
 members = [
     "pyo3-ffi",
+    "pyo3-ffi-check",
+    "pyo3-ffi-check/macro",
     "pyo3-build-config",
     "pyo3-macros",
     "pyo3-macros-backend",

noxfile.py

@@ -111,6 +111,9 @@ def _clippy(session: nox.Session, *, env: Dict[str, str] = None) -> bool:
                 *feature_set,
                 "--all-targets",
                 "--workspace",
+                # linting pyo3-ffi-check requires docs to have been built or
+                # the macros will error; doesn't seem worth it on CI
+                "--exclude=pyo3-ffi-check",
                 *extra,
                 external=True,
                 env=env,
@@ -404,9 +407,27 @@ def check_changelog(session: nox.Session):
 
 @nox.session(name="set-minimal-package-versions")
 def set_minimal_package_versions(session: nox.Session):
+    projects = (
+        None,
+        "examples/decorator",
+        "examples/maturin-starter",
+        "examples/setuptools-rust-starter",
+        "examples/word-count",
+    )
+
     # run cargo update first to ensure that everything is at highest
     # possible version, so that this matches what CI will resolve to.
+    for project in projects:
+        if project is None:
             _run(session, "cargo", "update", external=True)
+        else:
+            _run(
+                session,
+                "cargo",
+                "update",
+                f"--manifest-path={project}/Cargo.toml",
+                external=True,
+            )
 
     _run_cargo_set_package_version(session, "indexmap", "1.6.2")
     _run_cargo_set_package_version(session, "hashbrown:0.12.3", "0.9.1")
@@ -418,6 +439,9 @@ def set_minimal_package_versions(session: nox.Session):
     _run_cargo_set_package_version(session, "rayon", "1.5.3")
     _run_cargo_set_package_version(session, "rayon-core", "1.9.3")
 
+    # string_cache 0.8.4 depends on parking_lot 0.12
+    _run_cargo_set_package_version(session, "string_cache:0.8.4", "0.8.3")
+
     # 1.15.0 depends on hermit-abi 0.2.6 which has edition 2021 and breaks 1.48.0
     _run_cargo_set_package_version(session, "num_cpus", "1.14.0")
     _run_cargo_set_package_version(
@@ -433,7 +457,7 @@ def set_minimal_package_versions(session: nox.Session):
     )
     for project in projects:
         _run_cargo_set_package_version(
-            session, "parking_lot", "0.11.0", project=project
+            session, "parking_lot:0.12.1", "0.11.0", project=project
         )
         _run_cargo_set_package_version(session, "once_cell", "1.14.0", project=project)
 
@@ -447,7 +471,24 @@ def set_minimal_package_versions(session: nox.Session):
     # As a smoke test, cargo metadata solves all dependencies, so
     # will break if any crates rely on cargo features not
     # supported on MSRV
+    for project in projects:
+        if project is None:
             _run(session, "cargo", "metadata", silent=True, external=True)
+        else:
+            _run(
+                session,
+                "cargo",
+                "metadata",
+                f"--manifest-path={project}/Cargo.toml",
+                silent=True,
+                external=True,
+            )
+
+
+@nox.session(name="ffi-check")
+def ffi_check(session: nox.Session):
+    session.run("cargo", "doc", "-p", "pyo3-ffi", "--no-deps", external=True)
+    _run(session, "cargo", "run", "-p", "pyo3-ffi-check", external=True)
 
 
 @lru_cache()

pyo3-ffi-check/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "pyo3-ffi-check"
 version = "0.1.0"
-edition = "2021"
+edition = "2018"
 publish = false
 
 [dependencies]
@@ -10,12 +10,7 @@ memoffset = "0.7.0"
 
 [dependencies.pyo3-ffi]
 path = "../pyo3-ffi"
-features = ["extension-module"]  # A lazy way of skipping linking in most cases (as we don't use any runtime symbols)
-
-[workspace]
-members = [
-    "macro"
-]
+features = ["extension-module"]  # A lazy way of skipping linking in most cases (as we don't use any runtime symbols)
 
 [build-dependencies]
 bindgen = "0.63.0"

pyo3-ffi-check/build.rs

@@ -10,7 +10,6 @@ fn main() {
         .expect("failed to get lib dir");
 
     println!("cargo:rerun-if-changed=wrapper.h");
-    dbg!(format!("-I{python_include_dir}"));
 
     let bindings = bindgen::Builder::default()
         .header("wrapper.h")

pyo3-ffi-check/macro/Cargo.toml

@@ -1,7 +1,8 @@
 [package]
 name = "pyo3-ffi-check-macro"
 version = "0.1.0"
-edition = "2021"
+edition = "2018"
+publish = false
 
 [lib]
 proc-macro = true
@@ -10,4 +11,4 @@ proc-macro = true
 glob = "0.3"
 quote = "1"
 proc-macro2 = "1"
-scraper = "0.13"
+scraper = "0.12"

pyo3-ffi-check/macro/src/lib.rs

@@ -19,7 +19,7 @@ pub fn for_all_structs(input: proc_macro::TokenStream) -> proc_macro::TokenStrea
         }
     };
 
-    if !input.next().is_none() {
+    if input.next().is_some() {
         return quote!(compile_error!(
             "for_all_structs!() takes only a single ident as input"
         ))
@@ -109,7 +109,7 @@ pub fn for_all_fields(input: proc_macro::TokenStream) -> proc_macro::TokenStream
         }
     };
 
-    if !input.next().is_none() {
+    if input.next().is_some() {
         return quote!(compile_error!(
             "for_all_fields!() takes exactly two idents as input"
         ))

pyo3-ffi-check/src/main.rs

@@ -1,6 +1,13 @@
-use std::process::exit;
+use std::{ffi::CStr, process::exit};
 
 fn main() {
+    println!(
+        "comparing pyo3-ffi against headers generated for {}",
+        CStr::from_bytes_with_nul(bindings::PY_VERSION)
+            .unwrap()
+            .to_string_lossy()
+    );
+
     let mut failed = false;
 
     macro_rules! check_struct {

xtask/Cargo.toml

@@ -2,6 +2,7 @@
 name = "xtask"
 version = "0.1.0"
 edition = "2018"
+publish = false
 
 [[bin]]
 name = "xtask"