fixed noreturn and no_stack_protector brackets and other formatting and includes issues

Author: RoseZhang03

libc/src/__support/OSUtil/linux/exit.cpp

@@ -15,10 +15,9 @@ namespace LIBC_NAMESPACE::internal {
 // mark as no_stack_protector for x86 since TLS can be torn down before calling
 // exit so that the stack protector canary cannot be loaded.
 #ifdef LIBC_TARGET_ARCH_IS_X86
-__attribute__((no_stack_protector))
+[[clang::no_stack_protector]]
 #endif
-__attribute__((noreturn)) void
-exit(int status) {
+[[noreturn]] void exit(int status) {
   for (;;) {
     LIBC_NAMESPACE::syscall_impl<long>(SYS_exit_group, status);
     LIBC_NAMESPACE::syscall_impl<long>(SYS_exit, status);

libc/src/stdlib/CMakeLists.txt

@@ -49,7 +49,6 @@ add_entrypoint_object(
   HDRS
     quick_exit.h
   DEPENDS
-    libc.src.errno.errno
     libc.src.__support.OSUtil.osutil
 )
 

libc/src/stdlib/quick_exit.h

@@ -9,7 +9,6 @@
 #ifndef LLVM_LIBC_SRC_STDLIB_QUICK_EXIT_H
 #define LLVM_LIBC_SRC_STDLIB_QUICK_EXIT_H
 
-#include <stdlib.h>
 
 namespace LIBC_NAMESPACE {
 

libc/test/src/stdlib/quick_exit_test.cpp

@@ -13,4 +13,4 @@
 TEST(LlvmLibcStdlib, quick_exit) {
   EXPECT_EXITS([] { LIBC_NAMESPACE::quick_exit(1); }, 1);
   EXPECT_EXITS([] { LIBC_NAMESPACE::quick_exit(65); }, 65);
-}
+}