refactor: move binutils build into independent Docker layer

Signed-off-by: Martin Kröning <[email protected]>

Dockerfile

@@ -11,6 +11,38 @@ RUN cargo xtask build \
     --no-default-features \
     --features pci,smp,acpi,newlib,tcp,dhcpv4
 
+FROM buildpack-deps:bookworm AS binutils
+RUN set -eux; \
+    apt-get update; \
+    apt-get install -y --no-install-recommends \
+        bison \
+        flex \
+        texinfo \
+    ; \
+    rm -rf /var/lib/apt/lists/*;
+ADD --link https://github.com/hermit-os/binutils.git /binutils
+WORKDIR /binutils
+ARG TARGET
+ARG PREFIX
+RUN set -eux; \
+    ./configure \
+        --target=${TARGET} \
+        --prefix=${PREFIX} \
+        --with-sysroot \
+        --disable-werror \
+        --disable-multilib \
+        --disable-shared \
+        --disable-nls \
+        --disable-gdb \
+        --disable-libdecnumber \
+        --disable-readline \
+        --disable-sim \
+        --enable-tls \
+        --enable-lto \
+        --enable-plugin; \
+    make -O -j$(nproc); \
+    make install
+
 FROM buildpack-deps:bookworm AS builder
 
 RUN set -eux; \
@@ -29,15 +61,15 @@ RUN set -eux; \
 
 WORKDIR /root
 
+ARG PREFIX
 COPY --link --from=kernel /kernel/libhermit.a ./kernel/libhermit.a
-ADD --link https://github.com/hermit-os/binutils.git binutils
+COPY --link --from=binutils ${PREFIX} ${PREFIX}
 ADD --link https://github.com/hermit-os/gcc.git gcc
 ADD --link https://github.com/hermit-os/newlib.git newlib
 ADD --link https://github.com/hermit-os/pthread-embedded.git pte
 ADD --link ./toolchain.sh ./toolchain.sh
 
 ARG TARGET
-ARG PREFIX
 RUN ./toolchain.sh ${TARGET} ${PREFIX}
 
 

toolchain.sh

@@ -23,29 +23,6 @@ export CXXFLAGS_FOR_TARGET="-m64 -O3 -fPIE"
 
 echo "Build bootstrap toolchain for $TARGET with $NJOBS jobs for $PREFIX"
 
-if [ ! -d "tmp/binutils" ]; then
-mkdir -p tmp/binutils
-cd tmp/binutils
-../../binutils/configure \
-    --target=$TARGET \
-    --prefix=$PREFIX \
-    --with-sysroot \
-    --disable-werror \
-    --disable-multilib \
-    --disable-shared \
-    --disable-nls \
-    --disable-gdb \
-    --disable-libdecnumber \
-    --disable-readline \
-    --disable-sim \
-    --enable-tls \
-    --enable-lto \
-    --enable-plugin
-make -O $NJOBS
-make install
-cd -
-fi
-
 if [ ! -d "tmp/bootstrap" ]; then
 mkdir -p tmp/bootstrap
 cd tmp/bootstrap