build: Add -j to make install to speed compilation

Dockerfile

@@ -30,4 +30,9 @@ RUN apt update && apt install -y \
     wget \
     xz-utils
 
+# Install musl-based toolchains.
+ENV MUSL_INSTALL_DIR="/usr/"
+COPY src/compilation/install_musl_toolchains.sh .
+RUN ./install_musl_toolchains.sh
+
 WORKDIR /app/gdb

Makefile

@@ -59,7 +59,7 @@ $(PYTHON_TARGETS): build-with-python-%:
 
 _build-%: symlink-git-packages download-packages build-docker-image
 	mkdir -p build
-	docker run --user $(shell id -u):$(shell id -g) \
+	docker run -it --user $(shell id -u):$(shell id -g) \
 		--rm --volume .:/app/gdb gdb-static env TERM=xterm-256color \
 		/app/gdb/src/compilation/build.sh $* /app/gdb/build/ /app/gdb/src $(WITH_PYTHON)
 

src/compilation/build.sh

@@ -28,23 +28,23 @@ function set_compliation_variables() {
     >&2 fancy_title "Setting compilation variables for $target_arch"
 
     if [[ "$target_arch" == "arm" ]]; then
-        CROSS=arm-linux-gnueabi-
-        export HOST=arm-linux-gnueabi
+        CROSS=arm-linux-musleabi-
+        export HOST=arm-linux-musleabi
     elif [[ "$target_arch" == "aarch64" ]]; then
-        CROSS=aarch64-linux-gnu-
-        export HOST=aarch64-linux-gnu
+        CROSS=aarch64-linux-musl-
+        export HOST=aarch64-linux-musl
     elif [[ "$target_arch" == "powerpc" ]]; then
-        CROSS=powerpc-linux-gnu-
-        export HOST=powerpc-linux-gnu
+        CROSS=powerpc-linux-musl-
+        export HOST=powerpc-linux-musl
     elif [[ "$target_arch" == "mips" ]]; then
-        CROSS=mips-linux-gnu-
-        export HOST=mips-linux-gnu
+        CROSS=mips-linux-musl-
+        export HOST=mips-linux-musl
     elif [[ "$target_arch" == "mipsel" ]]; then
-        CROSS=mipsel-linux-gnu-
-        export HOST=mipsel-linux-gnu
+        CROSS=mipsel-linux-musl-
+        export HOST=mipsel-linux-musl
     elif [[ "$target_arch" == "x86_64" ]]; then
-        CROSS=x86_64-linux-gnu-
-        export HOST=x86_64-linux-gnu
+        CROSS=x86_64-linux-musl-
+        export HOST=x86_64-linux-musl
     fi
 
     export CC="${CROSS}gcc"
@@ -497,7 +497,7 @@ function install_gdb() {
 
     mkdir -p "$artifacts_location"
 
-    make -C "$gdb_build_dir" install "DESTDIR=$temp_artifacts_dir" 1>&2
+    make -j$(nproc) -C "$gdb_build_dir" install "DESTDIR=$temp_artifacts_dir" 1>&2
     if [[ $? -ne 0 ]]; then
         rm -rf "$temp_artifacts_dir"
         return 1

src/compilation/install_musl_toolchains.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+set -e
+
+# Define architectures and their respective musl toolchain URLs.
+ARCHS=("x86_64" "arm" "aarch64" "powerpc" "mips" "mipsel")
+BASE_URL="https://musl.cc"
+
+if [[ -z "$MUSL_INSTALL_DIR" ]]; then
+    echo "MUSL_INSTALL_DIR variable has not been set!"
+    exit 1
+fi
+
+# Create install directory.
+mkdir -p "$MUSL_INSTALL_DIR"
+cd "$MUSL_INSTALL_DIR"
+
+# Download and extract each toolchain.
+for ARCH in "${ARCHS[@]}"; do
+    TOOLCHAIN_TAR="${ARCH}-linux-musl-cross.tgz"
+
+    # Arm has a non-generic special toolchain name :(.
+    if [[ "$ARCH" == "arm" ]]; then
+        TOOLCHAIN_TAR="arm-linux-musleabi-cross.tgz"
+    fi
+
+    URL="$BASE_URL/$TOOLCHAIN_TAR"
+
+    echo "Downloading $URL..."
+    wget -q --show-progress "$URL"
+
+    echo "Extracting $TOOLCHAIN_TAR..."
+    tar -xzf "$TOOLCHAIN_TAR" --strip-components=1
+    rm "$TOOLCHAIN_TAR"
+done