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This commit fundamentally changes the way symbol emission in LDC works: Previously, whenever a declaration was used in some way, the compiler would check whether it actually needs to be defined in the currently processed module, based only on the symbol itself. This lack of contextual information proved to be a major problem in correctly handling emission of templates (see e.g. #454). Now, the DtoResolve…() family of functions and similar only ever declare the symbols, and definition is handled by doing a single pass over Module::members for the root module. This is the same strategy that DMD uses as well, which should also reduce the maintainance burden down the road (which is important as during the last few releases, there was pretty much always a symbol emission related problem slowing us down). Our old approach might have been a bit better tuned w.r.t. avoiding emission of unneeded template instances, but 2.064 will bring improvements here (DMD: FuncDeclaration::toObjFile). Barring such issues, the change shoud also marginally improve compile times because of declarations no longer being emitted when they are not needed. In the future, we should also consider refactoring the code so that it no longer directly accesses Dsymbol::ir but uses wrapper functions that ensure that the appropriate DtoResolve…() function has been called. GitHub: Fixes #454.
LDC – the LLVM-based D Compiler
===============================
The LDC project aims to provide a portable D programming language
compiler with modern optimization and code generation capabilities.
The compiler uses the official DMD frontends to support the latest
version of D2, and relies on the LLVM Core libraries for code
generation.
LDC is fully Open Source; the parts of the code not taken/adapted from
other projects are BSD-licensed (see the LICENSE file for details).
Please consult the D wiki for further information:
http://wiki.dlang.org/LDC
D1 is no longer available; see the 'd1' Git branch for the last
version supporting it.
Installation
------------
In-depth material on building and installing LDC and the standard
libraries, including experimental instructions for running LDC on
Windows, is available on the project wiki, at
http://wiki.dlang.org/Building_LDC_from_source.
If you have a working C++ build environment, CMake, a current LLVM and
libconfig++ (http://hyperrealm.com/libconfig/libconfig.html)
available, there should be no big surprises, though.
Do not forget to make sure all the submodules are up to date:
$ cd ldc
$ git submodule update --init
Some Linux distributions are also packaging a recent version of LDC,
so building it manually might not be necessary.
Contact
-------
The best way to get in touch with the developers is either via the
digitalmars.D.ldc forum/newsgroup/mailing list
(http://forum.dlang.org) or the #ldc IRC channel on FreeNode.
For further documentation, contributor information, etc. please see
the D wiki: http://wiki.dlang.org/LDC
Feedback of any kind is very much appreciated!