[libcpu] fix cpp11 error

libcpu/arm/cortex-a/backtrace.c

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2006-2022, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2019-03-29     Jesven       the first version
+ */
+
 #ifndef __CHECKER__
 #if !defined (__ARM_EABI__)
 #warning Your compiler does not have EABI support.
@@ -31,19 +41,6 @@ rt_inline void arm_get_current_stackframe(struct pt_regs *regs, struct stackfram
     frame->pc = regs->ARM_pc;
 }
 
-/* Dummy functions to avoid linker complaints */
-void __aeabi_unwind_cpp_pr0(void)
-{
-};
-
-void __aeabi_unwind_cpp_pr1(void)
-{
-};
-
-void __aeabi_unwind_cpp_pr2(void)
-{
-};
-
 struct unwind_ctrl_block {
     unsigned long vrs[16];      /* virtual register set */
     const unsigned long *insn;  /* pointer to the current instructions word */
@@ -376,6 +373,7 @@ static char *unwind_get_function_name(void *address)
     return RT_NULL;
 }
 #endif
+
 /*
  * Unwind a single frame starting with *sp for the symbol at *pc. It
  * updates the *pc and *sp with the new values.
@@ -542,4 +540,3 @@ void rt_backtrace(void)
     asm volatile ("mov %0, pc":"=r"(regs.pc));
     rt_unwind(&regs, 8);
 }
-

libcpu/arm/cortex-a/start_gcc.S

@@ -187,21 +187,6 @@ bss_loop:
     bl rt_hw_mmu_init
 #endif
 
-    /* call C++ constructors of global objects */
-    ldr     r0, =__ctors_start__
-    ldr     r1, =__ctors_end__
-
-ctor_loop:
-    cmp     r0, r1
-    beq     ctor_end
-    ldr     r2, [r0], #4
-    stmfd   sp!, {r0-r1}
-    mov     lr, pc
-    bx      r2
-    ldmfd   sp!, {r0-r1}
-    b       ctor_loop
-ctor_end:
-
     /* start RT-Thread Kernel */
     ldr     pc, _rtthread_startup
 _rtthread_startup: