ninjabackend: ensure that native static libraries use Unix-style naming

Depending on the target/linker, rustc --print native-static-libs may
output MSVC-style names. Converting these to Unix-style is safe, as the
list contains only native static libraries.

Fixes linking with C targets built with clang on x86_64-pc-windows-msvc
target.

Fixes: #14366

Author: kasper93

mesonbuild/backend/ninjabackend.py

@@ -3647,7 +3647,15 @@ def generate_link(self, target: build.BuildTarget, outname, obj_list, linker: T.
             for d in target.get_dependencies():
                 if isinstance(d, build.StaticLibrary):
                     for dep in d.get_external_deps():
-                        commands.extend_preserving_lflags(linker.get_dependency_link_args(dep))
+                        link_args = linker.get_dependency_link_args(dep)
+                        # Ensure that native static libraries use Unix-style naming if necessary.
+                        # Depending on the target/linker, rustc --print native-static-libs may
+                        # output MSVC-style names. Converting these to Unix-style is safe, as the
+                        # list contains only native static libraries.
+                        if dep.name == '_rust_native_static_libs' and linker.get_argument_syntax() != 'msvc':
+                            from ..linkers.linkers import VisualStudioLikeLinker
+                            link_args = VisualStudioLikeLinker.native_args_to_unix(link_args)
+                        commands.extend_preserving_lflags(link_args)
 
         # Add link args specific to this BuildTarget type that must not be overridden by dependencies
         commands += self.get_target_type_link_args_post_dependencies(target, linker)

mesonbuild/build.py

@@ -2173,7 +2173,8 @@ def post_init(self) -> None:
                 rustc = self.compilers['rust']
                 d = dependencies.InternalDependency('undefined', [], [],
                                                     rustc.native_static_libs,
-                                                    [], [], [], [], [], {}, [], [], [])
+                                                    [], [], [], [], [], {}, [], [], [],
+                                                    '_rust_native_static_libs')
                 self.external_deps.append(d)
         # By default a static library is named libfoo.a even on Windows because
         # MSVC does not have a consistent convention for what static libraries