wip: RISC-V build

.docker/Dockerfile.alpine

@@ -51,7 +51,13 @@ RUN apk add --no-cache \
 
 # Install UPX
 ARG ARCH
-RUN wget -O - https://github.com/upx/upx/releases/download/v5.0.0/upx-5.0.0-$(bash -c "echo \${0//v8/}" $ARCH)_linux.tar.xz | tar -xJf - -C /usr/local/bin --strip-components=1 --wildcards "*/upx"
+# UPX isn't supported on RISC-V yet, so skip this
+RUN if [ "$ARCH" != "riscv64" ]; then \
+        wget -O - https://github.com/upx/upx/releases/download/v5.0.0/upx-5.0.0-$(bash -c "echo \${0//v8/}" $ARCH)_linux.tar.xz | tar -xJf - -C /usr/local/bin --strip-components=1 --wildcards "*/upx"; \
+    else \
+        echo "Skipping UPX installation for RISC-V architecture while it is not supported."; \
+        echo "See https://github.com/upx/upx/discussions/793 for details."; \
+    fi
 
 # Install mistletoe
 RUN pip3 install --break-system-packages --root-user-action ignore mistletoe
@@ -67,11 +73,17 @@ RUN bash /usr/local/bin/install-mold.sh
 
 # Install bloaty
 COPY install-bloaty.sh /usr/local/bin/install-bloaty.sh
-RUN bash /usr/local/bin/install-bloaty.sh
+RUN if [ "$ARCH" != "riscv64" ]; then \
+        bash /usr/local/bin/install-bloaty.sh; \
+    else \
+        echo "Skipping bloaty installation for RISC-V."; \
+    fi
 
 # Install all static libraries
 COPY install-static-libs.sh /usr/local/bin/install-static-libs.sh
-RUN bash /usr/local/bin/install-static-libs.sh gcc clang-19 :alpine
+RUN bash /usr/local/bin/install-static-libs.sh gcc clang-19 :alpine:benchmark,boost,brotli,double-conversion,fmt,fuse,glog,jemalloc,libunwind,lz4,mimalloc,xxhash,xz,zstd
+RUN bash /usr/local/bin/install-static-libs.sh gcc clang-19 :alpine:cpptrace,flac
+RUN bash /usr/local/bin/install-static-libs.sh gcc clang-19 :alpine:libressl,openssl,libarchive
 
 # Install the *real* ninja...
 # TODO: move this up if we change anything

.docker/Makefile

@@ -1,5 +1,6 @@
 IMAGE_UBUNTU="dwarfs-buildenv"
 IMAGE_ALPINE="dwarfs-buildenv-alpine"
+IMAGE_ALPINE_RISCV="dwarfs-buildenv-alpine-riscv64"
 IMAGE_UBUNTU2204="dwarfs-buildenv-ubuntu2204"
 IMAGE_FEDORA="dwarfs-buildenv-fedora"
 IMAGE_ARCH="dwarfs-buildenv-arch"
@@ -31,6 +32,12 @@ build_alpine:
 run_alpine:
 	@docker run $(COMMON_RUN_OPTS) $(IMAGE_ALPINE)
 
+build_alpine_riscv:
+	docker build -f Dockerfile.alpine -t $(IMAGE_ALPINE_RISCV) --build-arg ARCH=riscv64 --platform=linux/riscv64 .
+
+run_alpine_riscv:
+	@docker run --platform=linux/riscv64 $(COMMON_RUN_OPTS) $(IMAGE_ALPINE_RISCV)
+
 build_ubuntu2204:
 	docker build -f Dockerfile.ubuntu-2204 -t $(IMAGE_UBUNTU2204) .
 

.docker/install-static-libs.sh

@@ -41,12 +41,22 @@ echo "Using $GCC and $CLANG"
 if [[ "$PKGS" == ":ubuntu" ]]; then
     PKGS="file,bzip2,libarchive,flac,libunwind,benchmark,openssl,cpptrace"
     COMPILERS="clang gcc"
-elif [[ "$PKGS" == ":alpine" ]]; then
+elif [[ "$PKGS" == ":alpine"* ]]; then
-    PKGS="benchmark,boost,brotli,cpptrace,double-conversion,flac,fmt,fuse,glog,jemalloc,libarchive,libunwind,libressl,lz4,mimalloc,openssl,xxhash,xz,zstd"
+    if [[ "$PKGS" == ":alpine" ]]; then
+        PKGS="benchmark,boost,brotli,cpptrace,double-conversion,flac,fmt,fuse,glog,jemalloc,libarchive,libunwind,libressl,lz4,mimalloc,openssl,xxhash,xz,zstd"
+    else
+        PKGS="${PKGS#:alpine:}"
+    fi
     export COMMON_CFLAGS="-ffunction-sections -fdata-sections -fmerge-all-constants"
     export COMMON_CXXFLAGS="$COMMON_CFLAGS"
+    export COMMON_LDFLAGS="-fuse-ld=mold"
     # COMPILERS="clang clang-lto clang-minsize-lto gcc"
-    COMPILERS="clang clang-minsize-lto gcc"
+    if [[ "$ARCH" != "x86_64" && "$ARCH" != "aarch64" ]]; then
+        # We have to emulate all other architectures, so let's keep it simple
+        COMPILERS="clang-minsize-lto"
+    else
+        COMPILERS="clang clang-minsize-lto gcc"
+    fi
 elif [[ "$PKGS" == ":none" ]]; then
     echo "No libraries to build"
     exit 0
@@ -451,7 +461,9 @@ for COMPILER in $COMPILERS; do
             ./configure --prefix="$prefix" \
                         --without-iconv --without-xml2 --without-expat \
                         --without-bz2lib --without-zlib \
-                        --disable-shared --disable-acl --disable-xattr
+                        --disable-shared --disable-acl --disable-xattr \
+                        --disable-bsdtar --disable-bsdcat --disable-bsdcpio \
+                        --disable-bsdunzip
             make -j$(nproc)
             make install
         done
@@ -472,7 +484,8 @@ for COMPILER in $COMPILERS; do
         cd "$HOME/pkgs/$COMPILER"
         tar xf ../${FLAC_TARBALL}
         cd flac-${FLAC_VERSION}
-        ./configure --prefix="$INSTALL_DIR" --enable-static=yes --enable-shared=no --disable-doxygen-docs --disable-ogg --disable-programs --disable-examples
+        ./configure --prefix="$INSTALL_DIR" --enable-static=yes --enable-shared=no \
+                    --disable-doxygen-docs --disable-ogg --disable-programs --disable-examples
         make -j$(nproc)
         make install
     fi