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[tests] Add -Wno-implicit-function-declaration for LTP build #2005

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[tests] Add -Wno-implicit-function-declaration for LTP build #2005

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Commits on Sep 24, 2024

  1. [tests] Add -Wno-implicit-function-declaration for LTP build 

    Currently used version of LTP has a bug that results in the following
build error, e.g. when using Clang v18 on Ubuntu 24.04:

    clone301.c:136:8: error: call to undeclared function 'pidfd_send_signal'

This is because Clang promoted "implicit function declaration" check
from a warning to an error starting from Clang v16. This commit adds
`-Wno-implicit-function-declaration` flag to CFLAGS during LTP build.

Newer LTP releases fixed this bug, so in the future, when Gramine uses
newer LTP, this commit should be reverted.

Signed-off-by: Dmitrii Kuvaiskii <[email protected]>
    @dimakuv
    dimakuv committed Sep 24, 2024
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