interpreter: Don't say we're using -lfoo args when we're not

cc.compiles(), and other compiler checks that use cc.compiles() under
the hood, do not use link args at all when doing the compile check, so
messages like this:

```
Checking if "have zlib" with dependency -lz compiles: YES
```

is very misleading. The compiler check command-line for that is:

```
cc [...]/testfile.c -o [...]/output.obj -c -D_FILE_OFFSET_BITS=64 -O0
```

Note the lack of linker args.

1 files changed, 11 insertions, 9 deletions

diff --git a/mesonbuild/interpreter/compiler.py b/mesonbuild/interpreter/compiler.py
index d75883a..6cf264f 100644
--- a/mesonbuild/interpreter/compiler.py
+++ b/mesonbuild/interpreter/compiler.py
@@ -190,7 +190,7 @@ class CompilerHolder(ObjectHolder['Compiler']):
     def compiler(self) -> 'Compiler':
         return self.held_object
 
-    def _dep_msg(self, deps: T.List['dependencies.Dependency'], endl: str) -> str:
+    def _dep_msg(self, deps: T.List['dependencies.Dependency'], compile_only: bool, endl: str) -> str:
         msg_single = 'with dependency {}'
         msg_many = 'with dependencies {}'
         if not deps:
@@ -204,6 +204,8 @@ class CompilerHolder(ObjectHolder['Compiler']):
                                       location=self.current_node)
                 continue
             if isinstance(d, dependencies.ExternalLibrary):
+                if compile_only:
+                    continue
                 name = '-l' + d.name
             else:
                 name = d.name
@@ -239,9 +241,9 @@ class CompilerHolder(ObjectHolder['Compiler']):
         args.extend(extra_args)
         return args
 
-    def _determine_dependencies(self, deps: T.List['dependencies.Dependency'], endl: str = ':') -> T.Tuple[T.List['dependencies.Dependency'], str]:
+    def _determine_dependencies(self, deps: T.List['dependencies.Dependency'], compile_only: bool = False, endl: str = ':') -> T.Tuple[T.List['dependencies.Dependency'], str]:
         deps = dependencies.get_leaf_external_dependencies(deps)
-        return deps, self._dep_msg(deps, endl)
+        return deps, self._dep_msg(deps, compile_only, endl)
 
     @typed_pos_args('compiler.alignment', str)
     @typed_kwargs(
@@ -252,7 +254,7 @@ class CompilerHolder(ObjectHolder['Compiler']):
     )
     def alignment_method(self, args: T.Tuple[str], kwargs: 'AlignmentKw') -> int:
         typename = args[0]
-        deps, msg = self._determine_dependencies(kwargs['dependencies'])
+        deps, msg = self._determine_dependencies(kwargs['dependencies'], compile_only=self.compiler.is_cross)
         result = self.compiler.alignment(typename, kwargs['prefix'], self.environment,
                                          extra_args=kwargs['args'],
                                          dependencies=deps)
@@ -269,7 +271,7 @@ class CompilerHolder(ObjectHolder['Compiler']):
                 code.rel_to_builddir(self.environment.source_dir))
         testname = kwargs['name']
         extra_args = functools.partial(self._determine_args, kwargs['no_builtin_args'], kwargs['include_directories'], kwargs['args'])
-        deps, msg = self._determine_dependencies(kwargs['dependencies'], endl=None)
+        deps, msg = self._determine_dependencies(kwargs['dependencies'], compile_only=False, endl=None)
         result = self.compiler.run(code, self.environment, extra_args=extra_args,
                                    dependencies=deps)
         if testname:
@@ -346,7 +348,7 @@ class CompilerHolder(ObjectHolder['Compiler']):
     def has_function_method(self, args: T.Tuple[str], kwargs: 'CommonKW') -> bool:
         funcname = args[0]
         extra_args = self._determine_args(kwargs['no_builtin_args'], kwargs['include_directories'], kwargs['args'])
-        deps, msg = self._determine_dependencies(kwargs['dependencies'])
+        deps, msg = self._determine_dependencies(kwargs['dependencies'], compile_only=False)
         had, cached = self.compiler.has_function(funcname, kwargs['prefix'], self.environment,
                                                  extra_args=extra_args,
                                                  dependencies=deps)
@@ -386,7 +388,7 @@ class CompilerHolder(ObjectHolder['Compiler']):
     def compute_int_method(self, args: T.Tuple[str], kwargs: 'CompupteIntKW') -> int:
         expression = args[0]
         extra_args = functools.partial(self._determine_args, kwargs['no_builtin_args'], kwargs['include_directories'], kwargs['args'])
-        deps, msg = self._determine_dependencies(kwargs['dependencies'])
+        deps, msg = self._determine_dependencies(kwargs['dependencies'], compile_only=self.compiler.is_cross)
         res = self.compiler.compute_int(expression, kwargs['low'], kwargs['high'],
                                         kwargs['guess'], kwargs['prefix'],
                                         self.environment, extra_args=extra_args,
@@ -399,7 +401,7 @@ class CompilerHolder(ObjectHolder['Compiler']):
     def sizeof_method(self, args: T.Tuple[str], kwargs: 'CommonKW') -> int:
         element = args[0]
         extra_args = functools.partial(self._determine_args, kwargs['no_builtin_args'], kwargs['include_directories'], kwargs['args'])
-        deps, msg = self._determine_dependencies(kwargs['dependencies'])
+        deps, msg = self._determine_dependencies(kwargs['dependencies'], compile_only=self.compiler.is_cross)
         esize = self.compiler.sizeof(element, kwargs['prefix'], self.environment,
                                      extra_args=extra_args, dependencies=deps)
         mlog.log('Checking for size of', mlog.bold(element, True), msg, esize)
@@ -465,7 +467,7 @@ class CompilerHolder(ObjectHolder['Compiler']):
 
         testname = kwargs['name']
         extra_args = functools.partial(self._determine_args, kwargs['no_builtin_args'], kwargs['include_directories'], kwargs['args'])
-        deps, msg = self._determine_dependencies(kwargs['dependencies'])
+        deps, msg = self._determine_dependencies(kwargs['dependencies'], compile_only=False)
         result, cached = self.compiler.links(code, self.environment,
                                              compiler=compiler,
                                              extra_args=extra_args,