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README.md

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DMD's source code

This directory contains the source code of the dmd compiler. Refer to this file for an overview of the actual source files.

Building the compiler

The compiler can be built using the integrated build system build.d.

./build.d

Building requires a host D compiler (DMD/LDC/GDC) of version 2.079.1 or above and defaults to dmd as found on the path. This behaviour can be overriden by explicitly specifying a different host compiler using the HOST_DMD variable.

./build.d HOST_DMD=<compiler path>

Note that building with LDC & GDC requires the ldmd2/gdmd wrappers to translate the command line arguments.

See the output of ./build.d --help to get a list of all supported targets or see the list of major targets below.

Prerequisites

To bootstrap dmd on posix you need to have a C++ compiler installed, such as gcc, when using the default $CC setting.

Bootstrapping

Use bootstrap.sh to bootstrap the compiler if there is no D compiler installed. The script will download an official release and use it as a host compiler when forwarding targets to build.d.

Refer to the HOST_DMD_VER variable in bootstrap.sh for the currently used release version.

Major targets

build.d supports a variety of checks for the source which are enforced alongside of the general test suite.

unittest

Runs all unittest blocks in the source code.

cxx-unittest

Runs the C++ frontent test to verify the manually created C++ headers in the source directory.

Note: This is currently not supported on windows.

cxx-headers-test

Automatically generates a C++ header from the compilers source code using the integrated C++ header generator dtoh and compares it to the reference header.

Changes to the C++ interface need to be reflected in both the reference and the manually curated header (named XXX.h for XXX.d). The first can be done automatically by passing AUTO_UPDATE=1 when running this target.

./build.d cxx-headers-test AUTO_UPDATE=1

Note that dtoh is currently experimental and may emit invalid code for certain declarations, so frontend.h is not required to be compilable until the remaining issues are resolved.