Only link to generated pch object when using msvc. (#12957)

backend: Only link to generated pch object when using msvc

mesonbuild/backend/ninjabackend.py

@@ -3121,7 +3121,10 @@ https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47485'''))
         commands += self._generate_single_compile(target, compiler)
         commands += self.get_compile_debugfile_args(compiler, target, objname)
         dep = dst + '.' + compiler.get_depfile_suffix()
-        return commands, dep, dst, [objname], source
+
+        link_objects = [objname] if compiler.should_link_pch_object() else []
+
+        return commands, dep, dst, link_objects, source
 
     def generate_gcc_pch_command(self, target, compiler, pch):
         commands = self._generate_single_compile(target, compiler)

mesonbuild/compilers/compilers.py

@@ -843,6 +843,9 @@ class Compiler(HoldableObject, metaclass=abc.ABCMeta):
     def get_compile_debugfile_args(self, rel_obj: str, pch: bool = False) -> T.List[str]:
         return []
 
+    def should_link_pch_object(self) -> bool:
+        return False
+
     def get_link_debugfile_name(self, targetfile: str) -> T.Optional[str]:
         return self.linker.get_debugfile_name(targetfile)
 

mesonbuild/compilers/mixins/visualstudio.py

@@ -425,6 +425,10 @@ class MSVCCompiler(VisualStudioLikeCompiler):
     def get_pch_base_name(self, header: str) -> str:
         return os.path.basename(header)
 
+    # MSVC requires linking to the generated object file when linking a build target
+    # that uses a precompiled header
+    def should_link_pch_object(self) -> bool:
+        return True
 
 class ClangClCompiler(VisualStudioLikeCompiler):