fix: preserve build action compiler driver

Author: ZheFeng7110

src/build/ninja_backend.cppm

@@ -642,7 +642,7 @@ std::string emit_ninja_string(const BuildPlan& plan) {
         if (needs_compiler_launcher(plan))
             return shell_quote_arg(escape_ninja_chars(
                 compiler_launcher_path(plan, cxx).string()));
-        return shell_quote_arg(escape_ninja_chars(binary.string()));
+        return escape_ninja_path(binary);
     };
     append(std::format("cxx       = {}\n", compiler_command(flags.cxxBinary, /*cxx=*/true)));
     // clang-scan-deps receives the driver after `--` as argv, not as a shell

tests/e2e/188_build_actions.sh

@@ -279,8 +279,11 @@ EOF
 printf 'int main() { return 0; }\n' > src/main.cpp
 "$MCPP" build > o0.log 2>&1 || { cat o0.log; echo "FAIL: probe build failed"; exit 1; }
 OBJ_NINJA=$(find target -name build.ninja | head -1)
-OBJ_CXX=$(sed -n 's/^cxx *= *//p' "$OBJ_NINJA" | head -1)
-[ -n "$OBJ_CXX" ] || { cat "$OBJ_NINJA"; echo "FAIL: could not read the compiler out of build.ninja"; exit 1; }
+# `cxx` may be a fingerprint-scoped launcher. This action is deliberately
+# retained after that build directory is removed below, so use the stable raw
+# driver exported for clang-scan-deps instead.
+OBJ_CXX=$(sed -n 's/^cxx_driver *= *//p' "$OBJ_NINJA" | head -1)
+[ -n "$OBJ_CXX" ] || { cat "$OBJ_NINJA"; echo "FAIL: could not read the compiler driver out of build.ninja"; exit 1; }
 
 cat > src/main.cpp <<'EOF'
 #include <cstdio>

tests/unit/test_toolchain_detect.cpp

@@ -116,7 +116,7 @@ if [[ "$1" != "--library-path" || "$2" != ")" << wanted.string() << R"(" ]]; the
     exit 127
 fi
 printf '%s\n' "$*" >> ")" << trace.string() << R"("
-shift 3
+shift 2
 exec env -u LD_LIBRARY_PATH "$@"
 )";
     loaderOs.close();