cargo: Use library() for C ABI

docs/markdown/Wrap-dependency-system-manual.md

@@ -373,6 +373,10 @@ recommended to regroup all Cargo dependencies inside a single workspace invoked
 from the main Meson project. When invoking multiple different Cargo subprojects
 from Meson, feature resolution of common dependencies might be wrong.
 
+Since *1.10.0* When a C ABI library is produced (`crate_type` contains `staticlib`
+and/or `cdylib`), Meson will follow the `default_library` option to decide
+whether a shared and/or static library should be built.
+
 ## Using wrapped projects
 
 Wraps provide a convenient way of obtaining a project into your

docs/markdown/snippets/cargo_default_library.md

@@ -0,0 +1,5 @@
+## Cargo C ABI libraries follows `default_library` option
+
+When a C ABI library is produced (`crate_type` contains `staticlib`
+and/or `cdylib`), Meson will follow the `default_library` option to decide
+whether a shared and/or static library should be built.

mesonbuild/cargo/interpreter.py

@@ -754,11 +754,16 @@ def _create_lib(self, pkg: PackageState, build: builder.Builder, subdir: str,
         if lib_type == 'proc-macro':
             lib = build.method('proc_macro', build.identifier('rust'), posargs, kwargs)
         else:
-            if static and shared:
+            if lib_type == 'c':
+                # Let Meson's default_library option decide for C ABI, regardless
+                # whether Cargo.toml requests static and/or shared.
+                target_type = 'library'
+            elif static and shared:
                 target_type = 'both_libraries'
+            elif shared:
+                target_type = 'shared_library'
             else:
-                target_type = 'shared_library' if shared else 'static_library'
-
+                target_type = 'static_library'
             kwargs['rust_abi'] = build.string(lib_type)
             lib = build.function(target_type, posargs, kwargs)