[haiku-bugs] Re: [Haiku] #6793: Issues with __cxa_atexit
- From: "bonefish" <trac@xxxxxxxxxxxx>
- Date: Sat, 06 Nov 2010 20:14:53 -0000
#6793: Issues with __cxa_atexit
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Reporter: kaliber | Owner: axeld
Type: bug | Status: closed
Priority: normal | Milestone: R1
Component: System/libroot.so | Version: R1/Development
Resolution: fixed | Keywords:
Blocked By: | Has a Patch: 0
Platform: All | Blocking:
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Comment (by bonefish):
Replying to [comment:5 kaliber]:
> In my opinion tool chain call looks fine:
Nope, it doesn't. As you can see the object is linked with
`/boot/develop/abi/x86/gcc4/tools/gcc-4.4.4-haiku-100705/lib/gcc/i586-pc-
haiku/4.4.4/crtbegin.o`. That file belongs to the gcc distribution. It
contains the function `__do_global_dtors_aux()` which would call
`__cxa_finalize()`, '''if''' gcc would register any destructors via
`__cxa_atexit()`. Since our gcc currently doesn't do the latter it also
doesn't do the former. If clang uses `__cxa_atexit()`, it has to make sure
that `__cxa_finalize()` is called -- it therefore cannot use gcc's
`crtbegin.o`. At least not until we enable that feature in gcc as well.
> Shouldn't dlclose() call/register "atexit"? LSB specification
http://refspecs.freestandards.org/LSB_3.2.0/LSB-Core-generic/LSB-Core-
generic/baselib---cxa_finalize.html says: "The implementation shall
arrange for _cxa_finalize() to be called during early shared library
unload (e.g. dlclose()) with a handle to the shared library".
The term "implementation" in the Itanium C++ ABI specification mainly
refers to the compiler/tool chain. In this case gcc definitely seems to
feel responsible as it calls `__cxa_finalize()` in its [http://dev.haiku-
os.org/browser/buildtools/trunk/gcc/gcc/crtstuff.c#L281 crtstuff.c]. We
just don't build the `crtbegin.o` version which would do that.
--
Ticket URL: <http://dev.haiku-os.org/ticket/6793#comment:6>
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