Add building dmd with dub

.github/workflows/main.yml

@@ -101,6 +101,8 @@ jobs:
  ci/run.sh setup_repos "$REPO_BRANCH"
  - name: Build
  run: ci/run.sh build
+ - name: Build with dub
+ run: dub run dmd:compiler -- --version
  - name: Rebuild dmd (with enabled coverage)
  if: matrix.coverage
  run: ENABLE_RELEASE=0 ENABLE_DEBUG=1 ENABLE_COVERAGE=1 ${{ runner.os == 'macOS' && 'OS_NAME=osx' || '' }} ci/run.sh rebuild

README.md

@@ -37,7 +37,13 @@ Refer to their respective `README.md` for more in-depth information.
 | [compiler/samples](compiler/samples) | Various code examples |
 | [druntime](druntime) | root of all runtime related code |
 
-For more general information regarding compiling, installing, and
+With a D compiler and dub installed, dmd can be built with:
+
+```
+dub build dmd:compiler
+```
+
+For more information regarding compiling, installing, and
 hacking on DMD, check the [contribution guide](CONTRIBUTING.md) and
 visit the [D Wiki](https://wiki.dlang.org/DMD).
 

dub.sdl

@@ -7,6 +7,17 @@ license "BSL-1.0"
 targetType "none"
 dependency ":frontend" version="*"
 
+subPackage {
+ name "compiler"
+ targetType "executable"
+ targetName "dmd"
+ sourcePaths "compiler/src/dmd"
+ importPaths "compiler/src"
+ stringImportPaths "compiler/src/dmd/res" "."
+ dflags "-L/STACK:16777216" platform="windows"
+ preGenerateCommands "echo -n /etc > SYSCONFDIR.imp" platform="posix"
+}
+
 subPackage {
  name "root"
  targetType "library"