Default to static linking runtime libs with GCC and Clang

src/dds/toolchain/toolchain.cpp

@@ -237,6 +237,12 @@ std::optional<toolchain> toolchain::get_builtin(std::string_view tc_id) noexcept
         return std::nullopt;
     }
 
+    if (starts_with(tc_id, "gcc") || starts_with(tc_id, "clang")) {
+        json5::data& arr = root_map.emplace("link_flags", json5::data::array_type()).first->second;
+        arr.as_array().emplace_back("-static-libgcc");
+        arr.as_array().emplace_back("-static-libstdc++");
+    }
+
     root_map.emplace("c_compiler", opt_triple->c);
     root_map.emplace("cxx_compiler", opt_triple->cxx);
     root_map.emplace("compiler_id", opt_triple->id);

tests/deps/use-spdlog/gcc.tc.jsonc

@@ -3,4 +3,5 @@
     "cxx_version": 'c++17',
     "cxx_compiler": 'g++-9',
     "flags": '-DSPDLOG_COMPILED_LIB',
+    "link_flags": '-static-libgcc -static-libstdc++'
 }