Add auditwheel Warn mode, default to Warn on macOS/Windows

maturin.schema.json

@@ -253,6 +253,11 @@
           "type": "string",
           "const": "check"
         },
+        {
+          "description": "Audit wheel and warn about external libraries, but do not fail or repair",
+          "type": "string",
+          "const": "warn"
+        },
         {
           "description": "Don't check for manylinux compliance",
           "type": "string",

src/auditwheel/audit.rs

@@ -14,6 +14,8 @@ pub enum AuditWheelMode {
     Repair,
     /// Check wheel for manylinux compliance, but do not repair
     Check,
+    /// Audit wheel and warn about external libraries, but do not fail or repair
+    Warn,
     /// Don't check for manylinux compliance
     Skip,
 }
@@ -23,6 +25,7 @@ impl fmt::Display for AuditWheelMode {
         match self {
             AuditWheelMode::Repair => write!(f, "repair"),
             AuditWheelMode::Check => write!(f, "check"),
+            AuditWheelMode::Warn => write!(f, "warn"),
             AuditWheelMode::Skip => write!(f, "skip"),
         }
     }

src/build_context/builder.rs

@@ -160,7 +160,7 @@ impl BuildContextBuilder {
         }
 
         let (strip, include_debuginfo, auditwheel) =
-            Self::resolve_build_flags(strip, &build_options, pyproject);
+            Self::resolve_build_flags(strip, &build_options, pyproject, &target);
 
         let sbom = Self::resolve_sbom_config(&build_options, pyproject);
 
@@ -319,6 +319,7 @@ impl BuildContextBuilder {
         strip: Option<bool>,
         build_options: &BuildOptions,
         pyproject: Option<&PyProjectToml>,
+        target: &Target,
     ) -> (bool, bool, AuditWheelMode) {
         let strip = strip.unwrap_or_else(|| pyproject.map(|x| x.strip()).unwrap_or_default());
         let include_debuginfo = if strip && build_options.output.include_debuginfo {
@@ -331,15 +332,20 @@ impl BuildContextBuilder {
         };
         let skip_auditwheel = pyproject.map(|x| x.skip_auditwheel()).unwrap_or_default()
             || build_options.platform.skip_auditwheel;
+        let default_mode = if skip_auditwheel {
+            AuditWheelMode::Skip
+        } else if target.is_linux() {
+            AuditWheelMode::Repair
+        } else {
+            // macOS and Windows repair support is newer;
+            // default to Warn so we don't break existing workflows.
+            AuditWheelMode::Warn
+        };
         let auditwheel = build_options
             .platform
             .auditwheel
             .or_else(|| pyproject.and_then(|x| x.auditwheel()))
-            .unwrap_or(if skip_auditwheel {
-                AuditWheelMode::Skip
-            } else {
-                AuditWheelMode::Repair
-            });
+            .unwrap_or(default_mode);
         (strip, include_debuginfo, auditwheel)
     }
 

src/build_context/repair.rs

@@ -165,11 +165,21 @@ impl BuildContext {
             }
         }
 
-        if matches!(self.python.auditwheel, AuditWheelMode::Check) {
-            bail!(
-                "Your library requires copying the above external libraries. \
-                 Re-run with `--auditwheel=repair` to copy them."
-            );
+        match self.python.auditwheel {
+            AuditWheelMode::Warn => {
+                eprintln!(
+                    "⚠️  Warning: Your library requires copying the above external libraries. \
+                     Re-run with `--auditwheel=repair` to copy them into the wheel."
+                );
+                return Ok(());
+            }
+            AuditWheelMode::Check => {
+                bail!(
+                    "Your library requires copying the above external libraries. \
+                     Re-run with `--auditwheel=repair` to copy them."
+                );
+            }
+            _ => {}
         }
 
         let repairer = self

tests/cmd/build.stdout

@@ -61,6 +61,7 @@ Options:
           Possible values:
           - repair: Audit and repair wheel for manylinux compliance
           - check:  Check wheel for manylinux compliance, but do not repair
+          - warn:   Audit wheel and warn about external libraries, but do not fail or repair
           - skip:   Don't check for manylinux compliance
 
       --zig

tests/cmd/publish.stdout

@@ -99,6 +99,7 @@ Options:
           Possible values:
           - repair: Audit and repair wheel for manylinux compliance
           - check:  Check wheel for manylinux compliance, but do not repair
+          - warn:   Audit wheel and warn about external libraries, but do not fail or repair
           - skip:   Don't check for manylinux compliance
 
       --zig