[libc] fix aarch64 linux full build (#95358)

Author: SchrodingerZhu

libc/config/linux/aarch64/entrypoints.txt

@@ -643,6 +643,12 @@ if(LLVM_LIBC_FULL_BUILD)
     libc.src.pthread.pthread_mutexattr_setrobust
     libc.src.pthread.pthread_mutexattr_settype
     libc.src.pthread.pthread_once
+    libc.src.pthread.pthread_rwlockattr_destroy
+    libc.src.pthread.pthread_rwlockattr_getkind_np
+    libc.src.pthread.pthread_rwlockattr_getpshared
+    libc.src.pthread.pthread_rwlockattr_init
+    libc.src.pthread.pthread_rwlockattr_setkind_np
+    libc.src.pthread.pthread_rwlockattr_setpshared
     libc.src.pthread.pthread_setspecific
 
     # sched.h entrypoints
@@ -753,6 +759,7 @@ if(LLVM_LIBC_FULL_BUILD)
     libc.src.unistd._exit
     libc.src.unistd.environ
     libc.src.unistd.execv
+    libc.src.unistd.fork
     libc.src.unistd.getopt
     libc.src.unistd.optarg
     libc.src.unistd.optind

libc/src/__support/threads/linux/CMakeLists.txt

@@ -64,6 +64,7 @@ add_object_library(
     .futex_utils
     libc.config.linux.app_h
     libc.include.sys_syscall
+    libc.include.fcntl
     libc.src.errno.errno
     libc.src.__support.CPP.atomic
     libc.src.__support.CPP.stringstream

libc/test/IntegrationTest/test.cpp

@@ -79,4 +79,10 @@ void *realloc(void *ptr, size_t s) {
 // Integration tests are linked with -nostdlib. BFD linker expects
 // __dso_handle when -nostdlib is used.
 void *__dso_handle = nullptr;
+
+// On some platform (aarch64 fedora tested) full build integration test
+// objects need to link against libgcc, which may expect a __getauxval
+// function. For now, it is fine to provide a weak definition that always
+// returns false.
+[[gnu::weak]] bool __getauxval(uint64_t, uint64_t *) { return false; }
 } // extern "C"