Building LDC from source
- Git (for fetching the source code, if not using a tarball)
- a C++ toolchain (GCC, Clang, …)
- CMake 2.8+
- LLVM 3.2 (3.1 or 3.0 work, but are not recommended, see LLVM issues affecting LDC)
- libconfig++ and its header files (the -devel or -dev package, for some Linux distributions)
- libcurl-dev for building the D2 standard library and tests (various versions available, e.g. libcurl4-gnutls-dev on Ubuntu)
Please check the LLVM page on broken versions of GCC and other tools to make sure your toolchain is not known to be bad.
Many Linux distributions already provide recent binary LLVM packages, sometimes in the form of user-curated package repositories (PPA, …). If an LLVM 3.2 pacakge is available, you might prefer to use it, as LLVM is a rather big project to build.
Building LLVM manually
Download LLVM 3.2 with $ wget http://www.llvm.org/releases/3.2/llvm-3.2.src.tar.gz, extract the archive, and then run:
$ ./configure --enable-optimized --disable-assertions --enable-targets=x86 $ make # add -j<n> as appropriate depending on your system $ sudo make install
If you are planning to work on LDC itself, you might want to install a debug build of LLVM instead by using ./configure --enable-assertions. Warning: This leads to a heavy slowdown!
Now, your system should be ready to build and install LDC from source. First, clone the [LDC GitHub repository](https://github.com/ldc-developers/ldc):
$ git clone --recursive http://github.com/ldc-developers/ldc.git
If you already have a local clone of the LDC repository, don’t forget to make sure your submodules are up to date by running git submodule update --init.
Then, just run the following commands as usual (see the list of useful CMake switches below):
cd ldc mkdir build && cd build # arbitrary working directory cmake .. make # -j<n> as appropriate sudo make install
The last step is optional; instead of installing it to the system, you can also choose to run LDC from the bin/ directory in your CMake working tree.
Useful CMake variables
- LIB_SUFFIX: Some Linux distributions, such as Fedora, expect 64 bit libraries in /usr/lib64 instead of /usr/lib. In this case, the installation directory can be adjusted using -DLIB_SUFFIX=64.
- CMAKE_INSTALL_PREFIX: The installation prefix, /usr/local by default (e.g. -DCMAKE_INSTALL_PREFIX=/opt/ldc).
- BUILD_SHARED_LIBS: Allows building of druntime/Phobos as shared libraries (unsupported!).
- INCLUDE_INSTALL_DIR: The location the D modules for druntime and Phobos are installed to.
- D_VERSION: Controls the D version the built compiler will support. Defaults to 2, use -DD_VERSION=1 to build the D1 compiler.
- RUNTIME_DIR, PHOBOS2_DIR: By default, druntime and Phobos are expected in runtime/ as Git submodules. Should circumstances require it, these paths can be changed by setting the variables accordingly.
The Makefiles generated by CMake respect the DESTDIR variable for the install target. It is prepended to all the file installation targets. This can be useful for building packages: $ make install DESTDIR=<your root directory>