fix(tests): prevent GlobalEnv double-init crash in multi-suite binaries

Add IsInitialized() to GlobalEnv and guard SetUpTestSuite so a second
test class in the same process skips re-initialization instead of
hitting CHECK(!initialized_). Also print try_compile output on
compile-fail test to surface header-not-found vs real type errors.

Author: chen2021673

infini_train/include/nn/parallel/global.h

@@ -31,6 +31,8 @@ class GlobalEnv {
     void Init(int threads_per_process, int tensor_parallel_size, bool sequence_parallel_enabled,
               int pipeline_parallel_size, int virtual_pipeline_parallel_size);
 
+    bool IsInitialized() const;
+
     int nnodes() const;
 
     int nproc_per_node() const;

infini_train/src/nn/parallel/global.cc

@@ -91,6 +91,11 @@ GlobalEnv &GlobalEnv::Instance() {
     return instance;
 }
 
+bool GlobalEnv::IsInitialized() const {
+    std::lock_guard<std::mutex> lock(mutex_);
+    return initialized_;
+}
+
 void GlobalEnv::Init(int nthread_per_process, int tensor_parallel_size, bool sequence_parallel_enabled,
                      int pipeline_parallel_size, int virtual_pipeline_parallel_size) {
     std::lock_guard<std::mutex> lock(mutex_);

tests/common/test_utils.h

@@ -103,7 +103,12 @@ inline void FillConstantTensor(const std::shared_ptr<Tensor> &tensor, float valu
 
 class InfiniTrainTest : public ::testing::TestWithParam<Device::DeviceType> {
 protected:
-    static void SetUpTestSuite() { nn::parallel::global::GlobalEnv::Instance().Init(1, 1, false, 1, 1); }
+    static void SetUpTestSuite() {
+        auto &env = nn::parallel::global::GlobalEnv::Instance();
+        if (!env.IsInitialized()) {
+            env.Init(1, 1, false, 1, 1);
+        }
+    }
     Device GetDevice() const { return Device(GetParam(), 0); }
     std::shared_ptr<Tensor> createTensor(const std::vector<int64_t> &shape, DataType dtype = DataType::kFLOAT32,
                                          bool requires_grad = false) {

tests/dtype/CMakeLists.txt

@@ -29,6 +29,8 @@ if(DTYPE_DISPATCH_COMPILE_UNEXPECTEDLY_SUCCEEDED)
     "dtype dispatch compile-fail test unexpectedly succeeded.\n"
     "Source: ${DTYPE_DISPATCH_COMPILE_FAIL_SOURCE}\n"
     "Output:\n${DTYPE_DISPATCH_TRY_COMPILE_OUTPUT}")
+else()
+  message(STATUS "compile-fail output:\n${DTYPE_DISPATCH_TRY_COMPILE_OUTPUT}")
 endif()
 
 add_custom_target(test_dtype_dispatch_compile_fail