Get rid of `need_cross_compiler`

Building a cross compiler (`build == host != target`) is not cross
compiling. As such, it doesn't make sense to handle it under
`is_cross_build`.

(N.B. Building a standard library for a cross compiler would require
cross compiling, but Meson has support to do such a thing as part of a
compiler build currently.)

mesonbuild/backend/backends.py

@@ -343,7 +343,6 @@ class Backend:
                 exe_is_native = True
             is_cross_built = (not exe_is_native) and \
                 self.environment.is_cross_build() and \
-                self.environment.cross_info.need_cross_compiler() and \
                 self.environment.cross_info.need_exe_wrapper()
             if is_cross_built:
                 exe_wrapper = self.environment.get_exe_wrapper()
@@ -693,7 +692,6 @@ class Backend:
             else:
                 cmd = [os.path.join(self.environment.get_build_dir(), self.get_target_filename(t.get_exe()))]
             is_cross = self.environment.is_cross_build() and \
-                self.environment.cross_info.need_cross_compiler() and \
                 self.environment.cross_info.need_exe_wrapper()
             if isinstance(exe, build.BuildTarget):
                 is_cross = is_cross and exe.is_cross

mesonbuild/backend/ninjabackend.py

@@ -536,7 +536,6 @@ int dummy;
         # a serialized executable wrapper for that and check if the
         # CustomTarget command needs extra paths first.
         is_cross = self.environment.is_cross_build() and \
-            self.environment.cross_info.need_cross_compiler() and \
             self.environment.cross_info.need_exe_wrapper()
         if mesonlib.for_windows(is_cross, self.environment) or \
            mesonlib.for_cygwin(is_cross, self.environment):
@@ -1338,7 +1337,7 @@ int dummy;
             if not is_cross:
                 self.generate_java_link(outfile)
         if is_cross:
-            if self.environment.cross_info.need_cross_compiler():
+            if self.environment.cross_info.is_cross_build():
                 static_linker = self.build.static_cross_linker
             else:
                 static_linker = self.build.static_linker
@@ -1381,12 +1380,6 @@ int dummy;
         num_pools = self.environment.coredata.backend_options['backend_max_links'].value
         ctypes = [(self.build.compilers, False)]
         if self.environment.is_cross_build():
-            if self.environment.cross_info.need_cross_compiler():
-                ctypes.append((self.build.cross_compilers, True))
-            else:
-                # Native compiler masquerades as the cross compiler.
-                ctypes.append((self.build.compilers, True))
-        else:
             ctypes.append((self.build.cross_compilers, True))
         for (complist, is_cross) in ctypes:
             for langname, compiler in complist.items():
@@ -1667,12 +1660,7 @@ rule FORTRAN_DEP_HACK%s
             self.generate_compile_rule_for(langname, compiler, False, outfile)
             self.generate_pch_rule_for(langname, compiler, False, outfile)
         if self.environment.is_cross_build():
-            # In case we are going a target-only build, make the native compilers
-            # masquerade as cross compilers.
-            if self.environment.cross_info.need_cross_compiler():
             cclist = self.build.cross_compilers
-            else:
-                cclist = self.build.compilers
             for langname, compiler in cclist.items():
                 if compiler.get_id() == 'clang':
                     self.generate_llvm_ir_compile_rule(compiler, True, outfile)
@@ -2235,7 +2223,7 @@ rule FORTRAN_DEP_HACK%s
         targetdir = self.get_target_private_dir(target)
         symname = os.path.join(targetdir, target_name + '.symbols')
         elem = NinjaBuildElement(self.all_outputs, symname, 'SHSYM', target_file)
-        if self.environment.is_cross_build() and self.environment.cross_info.need_cross_compiler():
+        if self.environment.is_cross_build():
             elem.add_item('CROSS', '--cross-host=' + self.environment.cross_info.config['host_machine']['system'])
         elem.write(outfile)
 

mesonbuild/environment.py

@@ -1215,11 +1215,6 @@ class CrossBuildInfo:
     def get_sys_root(self):
         return self.get_properties().get('sys_root', None)
 
-    # When compiling a cross compiler we use the native compiler for everything.
-    # But not when cross compiling a cross compiler.
-    def need_cross_compiler(self):
-        return 'host_machine' in self.config
-
     def need_exe_wrapper(self):
         value = self.config['properties'].get('needs_exe_wrapper', None)
         if value is not None:

mesonbuild/interpreter.py

@@ -2685,7 +2685,7 @@ external dependencies (including libraries) must go to "dependencies".''')
 
     def add_languages(self, args, required):
         success = True
-        need_cross_compiler = self.environment.is_cross_build() and self.environment.cross_info.need_cross_compiler()
+        need_cross_compiler = self.environment.is_cross_build()
         for lang in sorted(args, key=compilers.sort_clink):
             lang = lang.lower()
             if lang in self.coredata.compilers: