[cfe-dev] libc++ and const expr.

[David Blaikie]

For the record, the ultimate fix for this issue was Richard Smith's r150059.

- David

On Wed, Feb 8, 2012 at 3:03 PM, Matt Johnson <johnso87 at illinois.edu> wrote:
> I had this problem (static_assert in include/ratio) with Clang HEAD a few
> days ago, but it has since been resolved (r150103).  libc++ HEAD builds
> cleanly for me on Linux.
> -Matt
>
> On 5 Feb 2012, at 14:07, Christopher Jefferson wrote:
>
> On 4 Feb 2012, at 17:08, Richard Pennington wrote:
>
>> On Saturday, February 04, 2012 04:25:07 AM Jean-Daniel Dupas wrote:
>>> Hi,
>>>
>>> Am I the only one having trouble compiling libc++ with clang TOT.
>>> For sometime now, clang refuse to compile (and use it) because of the
>>> following issue:
>>>
>>> ../include/ratio:193:19: error: static_assert expression is not an
>>> integral
>>> ../include/ratio:189:27: note: declared here
>>>    static const intmax_t max = -min;
>>>
>>> -- Jean-Daniel
>>
>> I got the same thing.
>
> A number of things seem to have broken all at once. Commenting out that
> static_assert leads to a bug in src/locale.cpp about switching on '-1' on a
> switch on size_t in two places. Fixing that bug (by replacing -1 and -2 with
> (size_t)-1 and (size_t)-2, which is hopefully right.
>
> Fixing that leads to lining producing:
>
> ld: bad codegen, pointer diff in __ZSt17__throw_bad_allocv to global weak
> symbol __ZTISt9bad_alloc for architecture i386
>
> Rather than try to debug this myself, I'm tempted to leave it to more
> experienced people.
>
> One problem that this has shown me is that the recommended way of building
> libcxx (symlinking the svn directories into /usr/include and /usr/lib) means
> that if you svn update the library and it won't build, you are left with a
> totally non-functional library.
>
> Chris
>
>
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