[cfe-dev] Help with compiling code with libcxx

Ashok Nalkund ashoknn at qualcomm.com
Fri Jun 15 15:04:54 PDT 2012

Hi All,
   I compiled Qt with clang + libstdc++. Now using that, I'm trying to 
compile my code with clang + libc++. Now, one of the Qt headers is 
looking for std::bidirectional_iterator_tag by including <iterator>. 
This file does exist in libcxx/include and is picked up. However, 
<iterator> defines "bidirectional_iterator_tag" as:

> struct _LIBCPP_VISIBLE bidirectional_iterator_tag : public forward_iterator_tag {};

which is translated to:
> namespace std {inline namespace __1 {
> struct __attribute__ ((__visibility__("default"))) bidirectional_iterator_tag : public forward_iterator_tag {};

after pre-processing. So, the namespaces dont seem to match and clang 
compiles about incomplete type:
> include/QtCore/qtconcurrentiteratekernel.h:154:60: error: variable has incomplete type 'std::bidirectional_iterator_tag'

Any idea how to resolve this? I tried to compile Qt (4.8.2) with clang + 
libc++ but ran into problems with missing <ext/atomicity.h> in libc++.


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