Bug#666539: clang: Fails when trying to include chrono from C++11

[Markus Wanner]

Hi,

I just stumbled across this issue. As clang-3.2 certainly doesn't have
any chance of making it into this release anymore, shouldn't this bug be
reopened and assigned to libstdc++6-4.7? A one-line fix seems more
likely to still make it into the release.

I'd also be in favor of severity: important, because this issue really
renders clang unusable to some.

Regards

Markus Wanner



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Bug#666539: clang: Fails when trying to include chrono from C++11

[Manuel Bellersen]

On the clang page there is said
Patches are needed to make libstdc++-4.4
(http://clang.llvm.org/libstdc++4.4-clang0x.patch) and libstdc++-4.7
(http://clang.llvm.org/libstdc++4.7-clang11.patch) work with Clang in
C++11 mode. (http://clang.llvm.org/cxx_status.html)

There is also a bug-report on clang for this saying that this patches
should do it:
http://llvm.org/bugs/show_bug.cgi?id=12893

Hope that helps.



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Bug#666539: clang: Fails when trying to include chrono from C++11

[Sylvestre Ledru]

Hello Mario,

 
 x4:/tmp% clang++ -std=c++0x -o clang-chrono clang-chrono.cxx
 In file included from clang-chrono.cxx:1:
 /usr/include/c++/4.6/chrono:666:7: error: static_assert expression is not an 
 integral constant expression
   static_assert(system_clock::duration::min()
   ^ ~
 1 error generated.
 zsh: exit 1 clang++ -std=c++0x -o clang-chrono clang-chrono.cxx
I haven't checked if it is fixed in the current trunk or not but it
looks like it is a known issue:
http://lists.cs.uiuc.edu/pipermail/cfe-dev/2011-June/015641.html


Sylvestre




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Bug#666539: clang: Fails when trying to include chrono from C++11

[Mario Lang]

Package: clang
Version: 3.0-6
Severity: normal

Dear Maintainer,

clang fails to include chrono from C++11.

Here is a minimal example program:

---snip---
#include chrono
int main() { }
---snip---

Building with GCC (4.6 and 4.7) works fine:

x4:/tmp% g++-4.6 -std=c++0x -o clang-chrono clang-chrono.cxx
x4:/tmp% g++-4.7 -std=c++0x -o clang-chrono clang-chrono.cxx

However, building with clang fails:

x4:/tmp% clang++ -std=c++0x -o clang-chrono clang-chrono.cxx
In file included from clang-chrono.cxx:1:
/usr/include/c++/4.6/chrono:666:7: error: static_assert expression is not an 
integral constant expression
  static_assert(system_clock::duration::min()
  ^ ~
1 error generated.
zsh: exit 1 clang++ -std=c++0x -o clang-chrono clang-chrono.cxx

The same error happens with chrono from c++/4.7/.

I realize that this might be a libstdc++ bug.  However, gcc does not
trigger it, only clang seems to be strict enough (or broken enough? to
actually trigger it.  In any case, C++11 chrono is a no go on clang
right now :(.

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