GDB无法调试__thread变量

【标题描述】
使用GDB调试带有 __thread 变量的程序，在GDB中无法打印 __thread 变量，报错“Cannot find thread-local storage for process
”
【环境信息】
硬件信息：
华为TaiShan 2280 V2 * Kupeng 920

软件信息：
1）	openEuler release 20.03 (LTS)
2）	Linux version 4.19.90-2003.4.0.0036.oe1.aarch64 (abuild@obs-worker-003) (gcc version 7.3.0 (GCC)) #1 SMP Mon Mar 23 19:06:43 UTC 2020
3）	GNU gdb (GDB) EulerOS 8.3.1-11.oe1

【问题复现步骤】
具体操作步骤
1. 准备测试代码如下：
#include <pthread.h>
#include <stdio.h>
struct C { int x = 42; };
__thread C c;
int main()
{
        printf("%d\n", c.x);
}
编译： gcc -g thread_test.cpp -pthread
2. 使用gdb调试编译输出的二进制 a.out.  gdb a.out
```
(gdb) b main
Breakpoint 1 at 0x4006cc: file thread_test.cpp, line 7.
(gdb) r
Starting program: a.out 
Missing separate debuginfos, use: dnf debuginfo-install glibc-2.28-36.oe1.aarch64
warning: Unable to find libthread_db matching inferior's thread library, thread debugging will not be available.

Breakpoint 1, main () at thread_test.cpp:7
7		printf("%d\n", c.x);
(gdb) p c
Cannot find thread-local storage for process 2760355, executable file a.out:
Cannot find thread-local variables on this target
```

出现概率(是否必现，概率性错误)
必现
【预期结果】
gdb p能够正常打印变量值
【实际结果】
gdb报错
【其他】
网上搜索到两个相关的问题，但是貌似没有解决。
https://github.com/kunpengcompute/Kunpeng/issues/17
https://gitee.com/src-openeuler/glibc/issues/I1HAME

另外，通过网上搜索得知，问题产生的原因可能是系统的 libpthread.so 被 strip 了:
```
# file /usr/lib64/libthread_db-1.0.so 
/usr/lib64/libthread_db-1.0.so: ELF 64-bit LSB shared object, ARM aarch64, version 1 (SYSV), 
statically linked, BuildID[sha1]=xxx, 
for GNU/Linux 3.7.0, stripped

# file /usr/lib64/libpthread-2.28.so
/usr/lib64/libpthread-2.28.so: ELF 64-bit LSB shared object, ARM aarch64, version 1 (GNU/Linux), 
dynamically linked, interpreter /lib/ld-linux-aarch64.so.1, BuildID[sha1]=xxx, 
for GNU/Linux 3.7.0, stripped
```

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