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<p class="MsoNormal">Is there a special step to test with c++03? Because I could pass make check-cxx with lambdas in <atomic>.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Olivier<o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">Eric Fiselier <eric@efcs.ca><br>
<b>Date: </b>Sunday, February 10, 2019 at 2:11 PM<br>
<b>To: </b>Olivier Giroux <OGiroux@nvidia.com><br>
<b>Cc: </b>JF Bastien <jfbastien@apple.com>, "libcxx-dev@lists.llvm.org" <libcxx-dev@lists.llvm.org><br>
<b>Subject: </b>Re: [libcxx-dev] What C++03 support should <atomic> have?<o:p></o:p></span></p>
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<p class="MsoNormal">Libc++ is a C++11 STL implementation that tolerates C++03 compilers.<o:p></o:p></p>
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<p class="MsoNormal">If a feature can be reasonably implemented in C++03, then we provide it.<o:p></o:p></p>
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<p class="MsoNormal"><atomic> is one example, <thread>, <unordered_map> and `std::shared_ptr` are others.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">All of these components should have tests that run in C++03 (Tests are disabled in C++03 using the comment // UNSUPPORTED: c++98, c++03).<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Wed, Feb 6, 2019 at 11:39 PM Olivier Giroux via libcxx-dev <<a href="mailto:libcxx-dev@lists.llvm.org">libcxx-dev@lists.llvm.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Maybe another way to test these waters is to ask what is actually being _<i>tested_</i>?<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Olivier<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black"><<a href="mailto:jfbastien@apple.com" target="_blank">jfbastien@apple.com</a>> on behalf of JF Bastien <<a href="mailto:jfbastien@apple.com" target="_blank">jfbastien@apple.com</a>><br>
<b>Date: </b>Wednesday, February 6, 2019 at 11:21 AM<br>
<b>To: </b>Olivier Giroux <<a href="mailto:OGiroux@nvidia.com" target="_blank">OGiroux@nvidia.com</a>><br>
<b>Cc: </b>"<a href="mailto:libcxx-dev@lists.llvm.org" target="_blank">libcxx-dev@lists.llvm.org</a>" <<a href="mailto:libcxx-dev@lists.llvm.org" target="_blank">libcxx-dev@lists.llvm.org</a>><br>
<b>Subject: </b>Re: [libcxx-dev] What C++03 support should <atomic> have?</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Doing atomics before 11 was pretty wild… So I understand that people using an old C++ want some nice atomics. At the same time… They really should update to C++11 or later.
<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">What does libc++ try to do with new library features on old languages? Seems easy enough so support most of say optional or variant (without CTAD) before C++17. Is this done consistently?
And how far back, do we even try to support C++98? <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">It seems like we can be nice where it’s easy, but at some point in time are we just supporting stuff nobody cares about?<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On Feb 5, 2019, at 9:33 PM, Olivier Giroux via libcxx-dev <<a href="mailto:libcxx-dev@lists.llvm.org" target="_blank">libcxx-dev@lists.llvm.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Sorry, that quote is from my patch, but there’s identical code elsewhere in the file. I swear!<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Olivier<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:12.0pt">From:<span class="gmail-m-2222480216075481894apple-converted-space"> </span></span></b><span style="font-size:12.0pt">libcxx-dev <<a href="mailto:libcxx-dev-bounces@lists.llvm.org" target="_blank">libcxx-dev-bounces@lists.llvm.org</a>>
on behalf of Olivier Giroux via libcxx-dev <<a href="mailto:libcxx-dev@lists.llvm.org" target="_blank">libcxx-dev@lists.llvm.org</a>><br>
<b>Reply-To:<span class="gmail-m-2222480216075481894apple-converted-space"> </span></b>Olivier Giroux <<a href="mailto:OGiroux@nvidia.com" target="_blank">OGiroux@nvidia.com</a>><br>
<b>Date:<span class="gmail-m-2222480216075481894apple-converted-space"> </span></b>Tuesday, February 5, 2019 at 9:33 PM<br>
<b>To:<span class="gmail-m-2222480216075481894apple-converted-space"> </span></b>"<a href="mailto:libcxx-dev@lists.llvm.org" target="_blank">libcxx-dev@lists.llvm.org</a>" <<a href="mailto:libcxx-dev@lists.llvm.org" target="_blank">libcxx-dev@lists.llvm.org</a>><br>
<b>Subject:<span class="gmail-m-2222480216075481894apple-converted-space"> </span></b>[libcxx-dev] What C++03 support should <atomic> have?</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">There is a little bit of code in this file that suggests it once worked in C++03.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Like so:<o:p></o:p></p>
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<span style="font-size:10.0pt;font-family:Consolas;color:#C586C0">#ifndef</span><span class="gmail-m-2222480216075481894apple-converted-space"><span style="font-size:10.0pt;font-family:Consolas;color:#569CD6"> </span></span><span style="font-size:10.0pt;font-family:Consolas;color:#DCDCAA">_LIBCPP_CXX03_LANG</span><o:p></o:p></p>
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<span style="font-size:10.0pt;font-family:Consolas;color:#D4D4D4"> <span class="gmail-m-2222480216075481894apple-converted-space"> </span></span><span style="font-size:10.0pt;font-family:Consolas;color:#DCDCAA">__cxx_atomic_type</span><span style="font-size:10.0pt;font-family:Consolas;color:#D4D4D4">()
_NOEXCEPT =<span class="gmail-m-2222480216075481894apple-converted-space"> </span></span><span style="font-size:10.0pt;font-family:Consolas;color:#C586C0">default</span><span style="font-size:10.0pt;font-family:Consolas;color:#D4D4D4">;</span><o:p></o:p></p>
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<span style="font-size:10.0pt;font-family:Consolas;color:#C586C0">#else</span><o:p></o:p></p>
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<span style="font-size:10.0pt;font-family:Consolas;color:#D4D4D4"> <span class="gmail-m-2222480216075481894apple-converted-space"> </span></span><span style="font-size:10.0pt;font-family:Consolas;color:#DCDCAA">__cxx_atomic_type</span><span style="font-size:10.0pt;font-family:Consolas;color:#D4D4D4">()
_NOEXCEPT :<span class="gmail-m-2222480216075481894apple-converted-space"> </span></span><span style="font-size:10.0pt;font-family:Consolas;color:#DCDCAA">__a_value</span><span style="font-size:10.0pt;font-family:Consolas;color:#D4D4D4">() {}</span><o:p></o:p></p>
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<span style="font-size:10.0pt;font-family:Consolas;color:#C586C0">#endif</span><span class="gmail-m-2222480216075481894apple-converted-space"><span style="font-size:10.0pt;font-family:Consolas;color:#D4D4D4"> </span></span><span style="font-size:10.0pt;font-family:Consolas;color:#6A9955">//
_LIBCPP_CXX03_LANG</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Is that an actual design goal? It looks like it’s broken right now.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Do we maintain this, or do we bump the assumed default to C++11?<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thanks for your guidance,<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Olivier<o:p></o:p></p>
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If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original message.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:9.0pt;font-family:Helvetica">_______________________________________________<br>
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