Build docker executable with musl libc.

Dockerfile

@@ -1,4 +1,4 @@
-FROM busybox:glibc
+FROM busybox
 
 MAINTAINER "André Stein <[email protected]>"
 

ci/Dockerfile

@@ -0,0 +1,46 @@
+FROM alpine:3.10
+
+ENV DUB_BRANCH "v1.20.1"
+ENV RDMD_BRANCH "v2.091.0"
+
+RUN apk add --no-cache llvm5-libs g++ binutils-gold clang \
+    llvm8-libs llvm8-static llvm8-dev \
+    cmake ninja zlib-dev curl-dev curl-static openssl-dev git make
+
+# build ldc2 ########################################################
+
+ADD https://github.com/ldc-developers/ldc/releases/download/v1.13.0/ldc2-1.13.0-alpine-linux-x86_64.tar.xz /ldc-bin.tar.xz
+RUN tar xf ldc-bin.tar.xz
+
+# TODO: use environment variable from travis for LDC version
+ADD https://github.com/ldc-developers/ldc/releases/download/v1.21.0/ldc-1.21.0-src.tar.gz /ldc-src.tar.xz
+RUN tar xf ldc-src.tar.xz
+
+RUN mkdir /ldc-1.21.0-src/build \
+    && cd /ldc-1.21.0-src/build \
+    && cmake -G Ninja .. -DCMAKE_BUILD_TYPE=Release \
+        -DD_COMPILER=/ldc2-1.13.0-alpine-linux-x86_64/bin/ldmd2 \
+    && ninja -j2 \
+    && ninja install
+
+# build dub ##########################################################
+
+RUN git clone --single-branch --branch ${DUB_BRANCH} https://github.com/dlang/dub \
+    && cd dub \
+    && ldmd2 -run build.d \
+    && cp bin/dub /usr/local/bin/
+
+# build rdmd #########################################################
+
+RUN git clone --single-branch --branch ${RDMD_BRANCH} https://github.com/dlang/tools \
+    && cd tools \
+    && sed -i "s|^DMD = .*$|DMD = ldmd2|" posix.mak \
+    && sed -i "s|^INSTALL_DIR = .*$|INSTALL_DIR = $PWD|" posix.mak \
+    && make -f posix.mak install \
+    && cp bin/rdmd /usr/local/bin/
+
+
+COPY docker.build.sh /docker.build.sh
+RUN chmod +x /docker.build.sh
+
+ENTRYPOINT [ "/docker.build.sh" ]

ci/docker.build.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+set -e -u
+
+cd /core/
+dub build -c static --compiler=ldc2

ci/travis.sh

@@ -19,7 +19,9 @@ dub --compiler=${DC} -- --sanitycheck
 
 # Compile to static binary with ldc
 if [[ "${DC}" == "ldc2" ]]; then
-    dub build -c static --compiler=${DC}
+    docker build -t dlangtour_build ./ci/
+    docker run --rm -v `pwd`:/core/ -ti dlangtour_build
+
     docker build -t dlangtour_test_image ./
     docker run --rm -v /var/run/docker.sock:/var/run/docker.sock -ti dlangtour_test_image --wait-until-pulled --sanitycheck
 fi

dub.sdl

@@ -22,7 +22,9 @@ configuration "static" {
 	targetType "executable"
 	versions "VibeDefaultMain"
 	lflags "-lz" "-lssl" "-lcrypto" "-ldl" platform="posix"
-	dflags "-static" platform="posix"
+
+	// gcc on alpine has issues with the ld.gold linker, use bfd instead
+	dflags "-linker=bfd" "-static" platform="posix"
 }
 configuration "library" {
 	versions "VibeCustomMain"