Aws Lambda: C++ custom runtime - /usr/bin/ld: cannot find /usr/lib64/libc_nonshared.a

I am trying to add `g++` inside `AWS Lambda C++ custom runtime`.

Now `g++` requires `.so` (shared libraries) files as well as `.a` (static libraries).

For this, I installed g++ inside chroot directory (directory `gpp`) on the Amazon Linux machine.

Now, I created another directory that has `bin`, `usr`, `lib`, and `lib64` directories (taken from chroot directory). I created a zip of this directory, uploaded to s3 (as it is more than 50MB), and created a Lambda layer using this zip directory.

Now, after adding this `layer` in the `lambda` function, I am trying to run.
```
execl("/opt/usr/bin/g++48", "/opt/usr/bin/g++48", "-Wall", "/tmp/hello.cpp","-o", "/tmp/hello.o",
"-I/opt/gpp3/usr/include/", (char *) 0)
```

Using the above `g++` is able to find `shared libraries` as well as `header files` but it is not able to find the static library.

```
/usr/bin/ld: cannot find /usr/lib64/libc_nonshared.a
collect2: error: ld returned 1 exit status
```
`libc_nonshared.a` exists inside `/opt/gpp3/usr/lib64/` but it is searching in `/usr/lib64/`.

I tried providing full path in g++ command as `-L/opt/gpp3/usr/lib64/libc_nonshared.a` and
`-L/opt/gpp3/usr/lib64/libc_nonshared` and `-L/opt/gpp3/usr/lib64/`

But none of them works. Any help is deeply appreciated.

先从报告中的 execl 调用以及 /opt/gpp3 下的 AWS Lambda layer 路径入手，然后检查 linker 为什么搜索 /usr/lib64 而不是 layer 目录。重现 g++48 命令，并验证 libc_nonshared.a 是从 /opt/gpp3/usr/lib64 解析的；当示例编译在 Lambda 环境中成功时，该 issue 即完成。

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