We want -MQ instead of -MT for mkfile deps

src/dds/build/file_deps.test.cpp

     deps = dds::parse_mkfile_deps_str("foo.o: bar.c \\\n baz.c");
     CHECK(deps.output == "foo.o");
     CHECK(deps.inputs == path_vec("bar.c", "baz.c"));
+
+    deps = dds::parse_mkfile_deps_str(
+        "/some-path/Ю́рий\\ Алексе́евич\\ Гага́рин/build/obj/foo.main.cpp.o: \\\n"
+        "  /foo.main.cpp \\\n"
+        "  /stdc-predef.h\n");
+    CHECK(deps.output == "/some-path/Ю́рий Алексе́евич Гага́рин/build/obj/foo.main.cpp.o");
+    CHECK(deps.inputs == path_vec("/foo.main.cpp", "/stdc-predef.h"));
 }
 
 TEST_CASE("Invalid deps") {

src/dds/build/plan/compile_exec.cpp

 #include <dds/util/string.hpp>
 #include <dds/util/time.hpp>
 
+#include <neo/assert.hpp>
 #include <range/v3/range/conversion.hpp>
 #include <range/v3/view/filter.hpp>
 #include <range/v3/view/transform.hpp>
         } else {
             dds_log(trace, "Loading compilation dependencies from {}", df_path.string());
             auto dep_info = dds::parse_mkfile_deps_file(df_path);
-            assert(dep_info.output == cf.object_file_path);
+            neo_assert(invariant,
+                       dep_info.output == cf.object_file_path,
+                       "Generated mkfile deps output path does not match the object file path that "
+                       "we gave it to compile into.",
+                       dep_info.output.string(),
+                       cf.object_file_path.string());
             dep_info.command        = quote_command(cf.cmd_info.command);
             dep_info.command_output = compiler_output;
             ret_deps_info           = std::move(dep_info);

src/dds/toolchain/from_json.test.cpp

 
 TEST_CASE("Generating toolchain commands") {
     check_tc_compile("{compiler_id: 'gnu'}",
-                     "g++ -fPIC -pthread -MD -MF foo.o.d -MT foo.o -c foo.cpp -ofoo.o",
+                     "g++ -fPIC -pthread -MD -MF foo.o.d -MQ foo.o -c foo.cpp -ofoo.o",
                      "g++ -fPIC -pthread -Wall -Wextra -Wpedantic -Wconversion "
-                     "-MD -MF foo.o.d -MT foo.o -c foo.cpp -ofoo.o",
+                     "-MD -MF foo.o.d -MQ foo.o -c foo.cpp -ofoo.o",
                      "ar rcs stuff.a foo.o bar.o",
                      "g++ -fPIC foo.o bar.a -pthread -omeow.exe");
 
     check_tc_compile("{compiler_id: 'gnu', debug: true}",
-                     "g++ -g -fPIC -pthread -MD -MF foo.o.d -MT foo.o -c foo.cpp -ofoo.o",
+                     "g++ -g -fPIC -pthread -MD -MF foo.o.d -MQ foo.o -c foo.cpp -ofoo.o",
                      "g++ -g -fPIC -pthread -Wall -Wextra -Wpedantic -Wconversion "
-                     "-MD -MF foo.o.d -MT foo.o -c foo.cpp -ofoo.o",
+                     "-MD -MF foo.o.d -MQ foo.o -c foo.cpp -ofoo.o",
                      "ar rcs stuff.a foo.o bar.o",
                      "g++ -fPIC foo.o bar.a -pthread -omeow.exe -g");
 
     check_tc_compile("{compiler_id: 'gnu', debug: true, optimize: true}",
-                     "g++ -O2 -g -fPIC -pthread -MD -MF foo.o.d -MT foo.o -c foo.cpp "
+                     "g++ -O2 -g -fPIC -pthread -MD -MF foo.o.d -MQ foo.o -c foo.cpp "
                      "-ofoo.o",
                      "g++ -O2 -g -fPIC -pthread -Wall -Wextra -Wpedantic -Wconversion "
-                     "-MD -MF foo.o.d -MT foo.o -c foo.cpp -ofoo.o",
+                     "-MD -MF foo.o.d -MQ foo.o -c foo.cpp -ofoo.o",
                      "ar rcs stuff.a foo.o bar.o",
                      "g++ -fPIC foo.o bar.a -pthread -omeow.exe -O2 -g");
 
     check_tc_compile(
         "{compiler_id: 'gnu', debug: 'split', optimize: true}",
-        "g++ -O2 -g -gsplit-dwarf -fPIC -pthread -MD -MF foo.o.d -MT foo.o -c foo.cpp -ofoo.o",
+        "g++ -O2 -g -gsplit-dwarf -fPIC -pthread -MD -MF foo.o.d -MQ foo.o -c foo.cpp -ofoo.o",
         "g++ -O2 -g -gsplit-dwarf -fPIC -pthread -Wall -Wextra -Wpedantic -Wconversion -MD -MF "
-        "foo.o.d -MT foo.o -c foo.cpp -ofoo.o",
+        "foo.o.d -MQ foo.o -c foo.cpp -ofoo.o",
         "ar rcs stuff.a foo.o bar.o",
         "g++ -fPIC foo.o bar.a -pthread -omeow.exe -O2 -g -gsplit-dwarf");
 
                                       "-MD",
                                       "-MF",
                                       "foo.o.d",
-                                      "-MT",
+                                      "-MQ",
                                       "foo.o",
                                       "-c",
                                       "foo.cpp",
                                       "-MD",
                                       "-MF",
                                       "foo.o.d",
-                                      "-MT",
+                                      "-MQ",
                                       "foo.o",
                                       "-c",
                                       "foo.cpp",
                                       "-MD",
                                       "-MF",
                                       "foo.o.d",
-                                      "-MT",
+                                      "-MQ",
                                       "foo.o",
                                       "-c",
                                       "foo.cpp",

src/dds/toolchain/toolchain.cpp

                {"-MD"sv,
                 "-MF"sv,
                 std::string_view(gnu_depfile_path->string()),
-                "-MT"sv,
+                "-MQ"sv,
                 std::string_view(spec.out_path.string())});
     } else if (_deps_mode == file_deps_mode::msvc) {
         flags.push_back("/showIncludes");