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In the libc++ test suite, we consistently declare main() functions with
full parameters and explicitly return from the function. This helps code
that compiles the tests with -ffreestanding, where main() is not a
special function (with an implicit return and special mangling).
This patch fixes a few stray declarations, including in libunwind and
libc++abi.
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We can't use `dladdr()` in the tests, because when we're statically
linking with musl that function is a no-op.
Additionally, because musl disables emission of unwind information in
its build, and because its signal trampolines don't include unwind
information, tests that involve unwinding through a signal handler won't
work and need to be disabled for musl.
rdar://123436891
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During a backtrace the `.cfi_undefined` for a float register causes an assert in libunwind.
Reviewed By: MaskRay
Differential Revision: https://reviews.llvm.org/D110144
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