compilers: Allow setting workdir for run checks

This is not exposed in API, but will be used internally.

mesonbuild/compilers/compilers.py

@@ -717,7 +717,8 @@ def has_header_symbol(self, hname: str, symbol: str, prefix: str,
 
     def run(self, code: 'mesonlib.FileOrString', env: 'Environment', *,
             extra_args: T.Union[T.List[str], T.Callable[[CompileCheckMode], T.List[str]], None] = None,
-            dependencies: T.Optional[T.List['Dependency']] = None) -> RunResult:
+            dependencies: T.Optional[T.List['Dependency']] = None,
+            run_cwd: T.Optional[str] = None) -> RunResult:
         need_exe_wrapper = env.need_exe_wrapper(self.for_machine)
         if need_exe_wrapper and self.exe_wrapper is None:
             raise CrossNoRunException('Can not run test applications in this cross environment.')
@@ -730,7 +731,7 @@ def run(self, code: 'mesonlib.FileOrString', env: 'Environment', *,
             else:
                 cmdlist = [p.output_name]
             try:
-                pe, so, se = mesonlib.Popen_safe(cmdlist)
+                pe, so, se = mesonlib.Popen_safe(cmdlist, cwd=run_cwd)
             except Exception as e:
                 mlog.debug(f'Could not run: {cmdlist} (error: {e})\n')
                 return RunResult(False)