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LLVM TargetMachines default to using the (now-legacy) .ctors
representation of init functions. Mixing .ctors and .init_array
representations can cause issues when linking with lld.
This happens in practice for:
* Our profiling runtime which is currently implicitly built with
.init_array since it is built by clang, which sets this field.
* External C/C++ code that may be linked into the same process.
To support legacy systems which may use .ctors, targets may now specify
that they use .ctors via the use_ctors attribute which defaults to
false.
For debugging and manual control, -Z use-ctors-section=yes/no will allow
manual override.
Fixes: #71233
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NetBSD ignores this note and marks the stack no-exec unconditionally
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The no_default_libraries was introduced in #28578 because the
NetBSD-based rumprun needed to disable the link flag.
This moves the definition to be used by all NetBSD linker flavors to
close #49627.
A different solution would be adding -lc but as there is no platform
with explicit -lc, this approach is used.
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