test: Suppress upstream -Wduplicate-decl-specifier in bpfcc #32336

1. 
   maflcko commented at 8:27 am on April 24, 2025: member

   On some Linux kernel versions, the bpf compiler invoked in the functional tests will issue a -Wduplicate-decl-specifier warning.

   This seems harmless and should be fixed upstream in the Linux kernel.

   Here, simply suppress it for now. Fixes https://github.com/bitcoin/bitcoin/issues/32322

2. 
   DrahtBot commented at 8:27 am on April 24, 2025: contributor

   The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

   Code Coverage & Benchmarks

   For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/32336.

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3. DrahtBot added the label Tests on Apr 24, 2025
4. test: Add imports for util bpf_cflags

   This is required for the next commit.

   fa0c1baaf8
5. scripted-diff: Use bpf_cflags

   -BEGIN VERIFY SCRIPT-
   
    ren() { sed --regexp-extended -i "s/$1/$2/g" $( git grep --extended-regexp -l "$1" ) ; }
   
    ren 'cflags=\["-Wno-error=implicit-function-declaration"\]' 'cflags=bpf_cflags()'
   
   -END VERIFY SCRIPT-

   facb9b327b
6. maflcko force-pushed on Apr 24, 2025
7. laanwj approved
8. 
   laanwj commented at 9:19 am on April 24, 2025: member

   Code review ACK facb9b327b9da39ce1e09ed56199be9efb19b5b8
9. hebasto approved
10. 
    hebasto commented at 9:24 am on April 24, 2025: member

    ACK facb9b327b9da39ce1e09ed56199be9efb19b5b8, I have reviewed the code and it looks OK.
11. hebasto merged this on Apr 24, 2025
12. hebasto closed this on Apr 24, 2025

    ---

13. maflcko deleted the branch on Apr 24, 2025
14. 
    0xB10C commented at 10:12 am on April 24, 2025: contributor

    Post merge ACK
15. fanquake referenced this in commit 84e5576547 on Apr 24, 2025
16. fanquake referenced this in commit 4e8713094b on Apr 24, 2025
17. 
    fanquake commented at 2:12 pm on April 24, 2025: member

    Backported to 29.x in #32292.
18. fanquake referenced this in commit 3df2624ee9 on Apr 24, 2025
19. fanquake referenced this in commit e478e63cd3 on Apr 24, 2025
20. fanquake referenced this in commit 2ccdfa424c on Apr 24, 2025
21. 
    fanquake commented at 4:03 pm on April 24, 2025: member

    Backported to 28.x in #32299.

Contributors
maflcko DrahtBot laanwj hebasto 0xB10C fanquake

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