On segunda-feira, 3 de setembro de 2012 08.27.43, Olivier Goffart wrote: > > #include <utility> > > #if defined(__clang__) && !defined(_LIBCPP_VERSION) > > # error "C++11 with clang requires libc++ runtime" > > #endif > > But why do we require libc++? What's wrong with using the standard library > from recent GCC?
Because libstdc++ contains GCC'isms and doesn't contain the Clang'isms that
Clang requires. What's more, Clang supports certain C++11 features that GCC
doesn't, so their Standard Library contains the matching features.
> The way to do the detection should be to include the relevant standard
> headers and check they compile fine.
That wouldn't scale. The internals of those libraries are, well, internals.
We'd need to test every combination of libstdc++ release and patched release
with Clang, plus the same the other way around (GCC and libc++).
That also includes future releases...
That means basically trying to compile Qt with that compiler+header
combination to see if it works.
> Else, libc++ should probably be installed on the CI machines.
We should do that.
--
Thiago Macieira - thiago.macieira (AT) intel.com
Software Architect - Intel Open Source Technology Center
Intel Sweden AB - Registration Number: 556189-6027
Knarrarnäsgatan 15, 164 40 Kista, Stockholm, Sweden
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