build: dependencies should come after link_with on link command

This fixes regression caused by
3162b901ca
that changes the order in which libraries are put on the link command.

In addition, that commit was wrong because libraries from dependencies
were processed before process_compiler() is called, which that commit
wanted to avoid.

mesonbuild/build.py

@@ -755,8 +755,19 @@ class BuildTarget(Target):
         self.process_objectlist(objects)
         self.process_kwargs(kwargs)
         self.missing_languages = self.process_compilers()
-        self.link(extract_as_list(kwargs, 'link_with'))
-        self.link_whole(extract_as_list(kwargs, 'link_whole'))
+
+        # self.link_targets and self.link_whole_targets contains libraries from
+        # dependencies (see add_deps()). They have not been processed yet because
+        # we have to call process_compilers() first and we need to process libraries
+        # from link_with and link_whole first.
+        # See https://github.com/mesonbuild/meson/pull/11957#issuecomment-1629243208.
+        link_targets = extract_as_list(kwargs, 'link_with') + self.link_targets
+        link_whole_targets = extract_as_list(kwargs, 'link_whole') + self.link_whole_targets
+        self.link_targets.clear()
+        self.link_whole_targets.clear()
+        self.link(link_targets)
+        self.link_whole(link_whole_targets)
+
         if not any([self.sources, self.generated, self.objects, self.link_whole_targets, self.structured_sources,
                     kwargs.pop('_allow_no_sources', False)]):
             mlog.warning(f'Build target {name} has no sources. '
@@ -1337,8 +1348,8 @@ class BuildTarget(Target):
                 self.extra_files.extend(f for f in dep.extra_files if f not in self.extra_files)
                 self.add_include_dirs(dep.include_directories, dep.get_include_type())
                 self.objects.extend(dep.objects)
-                self.link(dep.libraries)
-                self.link_whole(dep.whole_libraries)
+                self.link_targets.extend(dep.libraries)
+                self.link_whole_targets.extend(dep.whole_libraries)
                 if dep.get_compile_args() or dep.get_link_args():
                     # Those parts that are external.
                     extpart = dependencies.InternalDependency('undefined',

test cases/unit/113 complex link cases/meson.build

@@ -47,3 +47,14 @@ s1 = static_library('t7-s1', 's1.c')
 s2 = static_library('t7-s2', 's2.c')
 s3 = static_library('t7-s3', 's3.c', link_with: [s1, s2], install: true)
 e = executable('t7-e1', 'main.c', link_with: s3)
+
+# Regression test: s3 should come last in the linker command. This seems to be
+# required for at least backward compatibility reasons:
+# https://github.com/mesonbuild/meson/pull/11957#issuecomment-1629243208
+s1 = static_library('t8-s1', 's1.c')
+s2 = static_library('t8-s2', 's2.c')
+s3 = static_library('t8-s3', 's3.c')
+e = executable('t8-e1', 'main.c',
+  link_with: [s1, s2],
+  dependencies: declare_dependency(link_with: s3),
+)

unittests/linuxliketests.py

@@ -1846,3 +1846,4 @@ class LinuxlikeTests(BasePlatformTests):
         self.assertIn('build t5-e1: c_LINKER t5-e1.p/main.c.o | libt5-s1.so.p/libt5-s1.so.symbols libt5-s3.a\n', content)
         self.assertIn('build t6-e1: c_LINKER t6-e1.p/main.c.o | libt6-s2.a libt6-s3.a\n', content)
         self.assertIn('build t7-e1: c_LINKER t7-e1.p/main.c.o | libt7-s3.a\n', content)
+        self.assertIn('build t8-e1: c_LINKER t8-e1.p/main.c.o | libt8-s1.a libt8-s2.a libt8-s3.a\n', content)