[clang] [clang][analyzer] Fix false positive of BlockInCriticalSectionChecker (PR #127049)

[via cfe-commits]

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@@ -0,0 +1,50 @@
+// RUN: %clang_analyze_cc1 \
+// RUN:   -analyzer-checker=unix.BlockInCriticalSection \
+// RUN:   -std=c++11 \
+// RUN:   -analyzer-output text \
+// RUN:   -verify %s
+
+// expected-no-diagnostics
+
+namespace std {
+  struct mutex {
+    void lock() {}
+    void unlock() {}
+  };
+  template<typename T>
+  struct lock_guard {
+    lock_guard<T>(std::mutex) {}
+    ~lock_guard<T>() {}
+  };
+  template<typename T>
+  struct unique_lock {
+    unique_lock<T>(std::mutex) {}
+    ~unique_lock<T>() {}
+  };
+  template<typename T>
+  struct not_real_lock {
+    not_real_lock<T>(std::mutex) {}
+  };
+  } // namespace std
+
+std::mutex mtx;
+using ssize_t = long long;
+using size_t = unsigned long long;
+int open (const char *__file, int __oflag, ...);
+ssize_t read(int fd, void *buf, size_t count);
+void close(int fd);
+#define O_RDONLY	     00
+# define O_NONBLOCK	  04000
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flovent wrote:

yes, it's copied from system header, but in system header there's a `#ifndef` outside, I will change this.
I think I run `git format` before push, will that no applies to testcase folder?

https://github.com/llvm/llvm-project/pull/127049