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buildenv: enable pointing enclave build to alternative glibc headers #1062

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buildenv: enable pointing enclave build to alternative glibc headers #1062

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Commits on Oct 9, 2024

  1. buildenv: enable pointing enclave build to alternative glibc headers 

    The enclaves must be built with headers from a specific glibc version
for the sake of reproducibility. It does not actually link to glibc,
merely requiring a few self contained definitions. In the NixOS build
env the glibc system include directories get set through various
wrapper scripts NixOS creates.

When attempting a reproducible build outside of NixOS though, we can't
rely on the compiler having the matching glibc system include dirs.
Instead there needs to be a way to inject "-isystem/some/path" args
into the enclave compiler flags.

This commit adds a "ENCLAVE_SYSTEM_INCLUDES" make var can be set by
the person triggering 'make', to provide a way to inject system include
directories to the enclave build process.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
    @berrange
    berrange committed Oct 9, 2024
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