[libc] newhdrgen: updated sorting of guarded functions in fuction generation (#98241)

In yaml_to_classes.py, changed order of adding functions so that guarded
functions appear after regular functions. Guarded functions will still
be alphabetically sorted within each guard. Each group of guarded
functions will appear in alphabetical order of the guard name.

Fixed issus in math.yaml such as missing guards.

Fixed Function class for spacing issues and the order in which
attributes are listed in the function header.

Deleted extra whitespace in the last line of unistd.yaml.

Author: RoseZhang03

libc/newhdrgen/class_implementation/classes/function.py

@@ -23,9 +23,12 @@ def __init__(
         self.attributes = attributes or ""
 
     def __str__(self):
-        attributes_str = self.attributes
+        attributes_str = " ".join(self.attributes)
         arguments_str = ", ".join(self.arguments)
-        result = f"{self.return_type} {self.name}({arguments_str}){attributes_str};"
+        if attributes_str == "":
+            result = f"{self.return_type} {self.name}({arguments_str}) __NOEXCEPT;"
+        else:
+            result = f"{attributes_str} {self.return_type} {self.name}({arguments_str}) __NOEXCEPT;"
         if self.guard:
             result = f"#ifdef {self.guard}\n{result}\n#endif // {self.guard}"
         return result

libc/newhdrgen/header.py

@@ -62,6 +62,6 @@ def __str__(self):
             content.append("")
         for object in self.objects:
             content.append(str(object))
-        content.append("\n__END_C_DECLS")
+        content.append("__END_C_DECLS")
 
         return "\n".join(content)

libc/newhdrgen/yaml/dlfcn.yaml

@@ -0,0 +1,39 @@
+header: dlfcn.h
+macros:
+  - macro_name: RTLD_LAZY
+    macro_value: null
+  - macro_name: RTLD_NOW
+    macro_value: null
+  - macro_name: RTLD_GLOBAL
+    macro_value: null
+  - macro_name: RTLD_LOCAL
+    macro_value: null
+types: []
+enums: []
+objects: []
+functions:
+  - name: dlclose
+    standards:
+      - POSIX
+    return_type: int
+    arguments:
+      - type: void *
+  - name: dlerror
+    standards:
+      - POSIX
+    return_type: char *
+    arguments: []
+  - name: dlopen
+    standards:
+      - POSIX
+    return_type: void *
+    arguments:
+      - type: const char *
+      - type: int
+  - name: dlsym
+    standards:
+      - POSIX
+    return_type: void *
+    arguments:
+      - type: void *__restrict
+      - type: const char *__restrict