RFR: 8352481: Extra a.out generated after configure with clang

[SendaoYan]

On Thu, 20 Mar 2025 06:57:04 GMT, SendaoYan <syan at openjdk.org> wrote:

> Hi all,
> 
> There is an extra a.out file generated located in repository root directory after execute the configure command with llvm/clang compiler sometimes, not always. The a.out was generate by `$LINKER -Wl,-v 2>&1 | $HEAD -n 1`, shows as below. This PR  add a command to remove the extra a.out file. No risk.
> 
> 
>> rm -rf a.out ; date ; ~/software/acc/x86_64/bin/clang -Wl,-v 2>&1 | head -n 1 ; stat a.out ; ls -lh a.out ; file a.out
> Thu Mar 20 02:46:13 PM CST 2025
> GNU ld (GNU Binutils) 2.43.50.20240909
>   File: a.out
>   Size: 792 Blocks: 8 IO Block: 4096 regular file
> Device: 10303h/66307d Inode: 2355308 Links: 1
> Access: (0640/-rw-r-----) Uid: ( 995/yansendao) Gid: ( 992/yansendao)
> Access: 2025-03-20 14:46:13.682967228 +0800
> Modify: 2025-03-20 14:46:13.682967228 +0800
> Change: 2025-03-20 14:46:13.682967228 +0800
>  Birth: 2025-03-20 14:46:13.674966977 +0800
> -rw-r----- 1 yansendao yansendao 792 Mar 20 14:46 a.out
> a.out: data

I have add a comment line do demonstrate why we need `RM -rf a.out`.

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PR Comment: https://git.openjdk.org/jdk/pull/24125#issuecomment-2744952540