Compiler checks can only accept external dependencies

This is already how it should've been, but:

a) The test for this was wrong since Dependency is a base class for all
dependencies and isinstance on an InternalDependency will also be true
b) Internal dependencies can't ever be used here anyway because compiler
checks are always run at configure time and internal dependencies are
only built after that.

mesonbuild/interpreter.py

@@ -22,6 +22,7 @@ from . import optinterpreter
 from . import compilers
 from .wrap import wrap
 from . import mesonlib
+from .dependencies import InternalDependency, Dependency
 from mesonbuild.interpreterbase import InterpreterBase
 from mesonbuild.interpreterbase import check_stringlist, noPosargs, noKwargs, stringArgs
 from mesonbuild.interpreterbase import InterpreterException, InvalidArguments, InvalidCode
@@ -649,10 +650,8 @@ class CompilerHolder(InterpreterObject):
         args += mesonlib.stringlistify(kwargs.get('args', []))
         return args
 
-    def determine_dependencies(self, kwargs, allowed_dep_types=None):
+    def determine_dependencies(self, kwargs):
         deps = kwargs.get('dependencies', None)
-        if allowed_dep_types is None:
-            allowed_dep_types = (dependencies.Dependency, dependencies.ExternalLibrary)
         if deps is not None:
             if not isinstance(deps, list):
                 deps = [deps]
@@ -662,8 +661,8 @@ class CompilerHolder(InterpreterObject):
                     d = d.held_object
                 except Exception:
                     pass
-                if not isinstance(d, allowed_dep_types):
-                    raise InterpreterException('Dependencies must be external deps')
+                if isinstance(d, InternalDependency) or not isinstance(d, Dependency):
+                    raise InterpreterException('Dependencies must be external dependencies')
                 final_deps.append(d)
             deps = final_deps
         return deps
@@ -722,7 +721,7 @@ class CompilerHolder(InterpreterObject):
         if not isinstance(prefix, str):
             raise InterpreterException('Prefix argument of has_member must be a string.')
         extra_args = self.determine_args(kwargs)
-        deps = self.determine_dependencies(kwargs, allowed_dep_types=(dependencies.Dependency,))
+        deps = self.determine_dependencies(kwargs)
         had = self.compiler.has_members(typename, [membername], prefix,
                                         self.environment, extra_args, deps)
         if had:
@@ -741,7 +740,7 @@ class CompilerHolder(InterpreterObject):
         if not isinstance(prefix, str):
             raise InterpreterException('Prefix argument of has_members must be a string.')
         extra_args = self.determine_args(kwargs)
-        deps = self.determine_dependencies(kwargs, allowed_dep_types=(dependencies.Dependency,))
+        deps = self.determine_dependencies(kwargs)
         had = self.compiler.has_members(typename, membernames, prefix,
                                         self.environment, extra_args, deps)
         if had:
@@ -798,7 +797,7 @@ class CompilerHolder(InterpreterObject):
         if not isinstance(prefix, str):
             raise InterpreterException('Prefix argument of sizeof must be a string.')
         extra_args = self.determine_args(kwargs)
-        deps = self.determine_dependencies(kwargs, allowed_dep_types=(dependencies.Dependency,))
+        deps = self.determine_dependencies(kwargs)
         esize = self.compiler.sizeof(element, prefix, self.environment, extra_args, deps)
         mlog.log('Checking for size of "%s": %d' % (element, esize))
         return esize
@@ -816,7 +815,7 @@ class CompilerHolder(InterpreterObject):
         if not isinstance(testname, str):
             raise InterpreterException('Testname argument must be a string.')
         extra_args = self.determine_args(kwargs)
-        deps = self.determine_dependencies(kwargs, allowed_dep_types=(dependencies.Dependency,))
+        deps = self.determine_dependencies(kwargs)
         result = self.compiler.compiles(code, self.environment, extra_args, deps)
         if len(testname) > 0:
             if result:
@@ -858,7 +857,7 @@ class CompilerHolder(InterpreterObject):
         if not isinstance(prefix, str):
             raise InterpreterException('Prefix argument of has_header must be a string.')
         extra_args = self.determine_args(kwargs)
-        deps = self.determine_dependencies(kwargs, allowed_dep_types=(dependencies.Dependency,))
+        deps = self.determine_dependencies(kwargs)
         haz = self.compiler.has_header(hname, prefix, self.environment, extra_args, deps)
         if haz:
             h = mlog.green('YES')
@@ -877,7 +876,7 @@ class CompilerHolder(InterpreterObject):
         if not isinstance(prefix, str):
             raise InterpreterException('Prefix argument of has_header_symbol must be a string.')
         extra_args = self.determine_args(kwargs)
-        deps = self.determine_dependencies(kwargs, allowed_dep_types=(dependencies.Dependency,))
+        deps = self.determine_dependencies(kwargs)
         haz = self.compiler.has_header_symbol(hname, symbol, prefix, self.environment, extra_args, deps)
         if haz:
             h = mlog.green('YES')

test cases/failing/38 has function external dependency/meson.build

@@ -0,0 +1,8 @@
+project('has function ext dep', 'c')
+
+cc = meson.get_compiler('c')
+
+mylib = shared_library('mylib', 'mylib.c')
+mylib_dep = declare_dependency(link_with : mylib)
+# Only external dependencies can work here
+cc.has_function('malloc', dependencies : mylib_dep)

test cases/failing/38 has function external dependency/mylib.c

@@ -0,0 +1 @@
+int testfunc(void) { return 0; }