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So far we create our DeclCollector in the CIFactory and then tried to
get this variable back in the IncrementalParser by casting the
ASTConsumer of our compiler instance to a DeclCollector. This strategy
fails as soon as we want to have multiple collectors and start using
the clang multiplexer as this call will now fail (e.g. in this case to
have another ASTConsumer that looks in the C++ modules case for what
libraries we need to link - and the best way to add this is via
the multiplexed ASTConsumer that clang provides).
This patch moves the responsibility for the DeclCollector to the
caller that relies on getting a DeclCollector back, which is in this
case the constructor of IncrementalParser.
To use C++ modules during runtime we need to generate a modulemap
and install it alongside the ROOT headers. However, right now
we need to turn on cxxmodules to generate a modulemap, which would
force experiments to fulfill all the depndencies that cxxmodules
brings with it (that is, a modern clang that can build ROOT with C++
modules).
This patch untangles the modulemap generation from the cxxmodules
option, so that we always generate a modulemap even when cxxmodules
is turned off. We now also install the modulemap alongside
the ROOT headers.
No functional change for normal ROOT expected here, as the modulemap
will just be ignored without having runtime C++ modules enabled.
// clang currently supports native __float128 only on few targets, and
// this target does not have it. The most visible consequence of this is a
// specialization
// __is_floating_point_helper<__float128>
// in include/c++/6.3.0/type_traits:344 that clang then rejects. The
// specialization is protected by !if _GLIBCXX_USE_FLOAT128 (which is
// unconditionally set in c++config.h) and #if !__STRICT_ANSI__. Tweak the
// latter by disabling GNUMode.
