feat: further improve toolchain sizes (#191)

Author: f0rmiga

sysroot/Dockerfile

@@ -167,8 +167,6 @@ RUN --mount=source=configure.sh,target=/usr/bin/configure.sh configure.sh \
         --with-headers=/var/install/kernel/usr/include \
         --with-tls \
         libc_cv_slibdir=/lib \
-        CFLAGS="-O2 -falign-functions=32" \
-        LDFLAGS="-Wl,-z,max-page-size=0x1000" \
         || (cat config.log && exit 1)
 RUN make all --jobs $(nproc)
 RUN make DESTDIR=/var/install/glibc install
@@ -179,6 +177,7 @@ WORKDIR /build/gcc/build
 COPY --from=kernel /var/install/kernel /var/install/gcc/sysroot
 COPY --from=glibc /var/install/glibc /var/install/gcc/sysroot
 RUN --mount=source=configure.sh,target=/usr/bin/configure.sh IS_GCC_BUILD=1 configure.sh \
+        --disable-bootstrap \
         --enable-default-pie \
         --enable-languages=c,c++,fortran,lto \
         --disable-multilib \
@@ -187,14 +186,10 @@ RUN --mount=source=configure.sh,target=/usr/bin/configure.sh IS_GCC_BUILD=1 conf
         --with-linker-hash-style=gnu \
         --with-build-sysroot=/var/install/gcc/sysroot \
         --with-sysroot=/RELOCATABLE_SYSROOT \
-        CFLAGS="-O2 -falign-functions=32" \
-        CXXFLAGS="-O2 -falign-functions=32" \
-        LDFLAGS="-Wl,-z,max-page-size=0x1000" \
         || (cat config.log && exit 1)
 RUN grep -rl '/RELOCATABLE_SYSROOT' . | xargs sed -i 's|/RELOCATABLE_SYSROOT|$(exec_prefix)/sysroot|g'
 RUN make --jobs $(nproc) all-gcc
 RUN make install-gcc
-RUN rm -v "/opt/gcc/${ARCH}/bin/"*{gcc,g++,cpp}
 ENV PATH="/var/install/gcc/bin:${PATH}"
 RUN make --jobs $(nproc)
 RUN make install
@@ -216,8 +211,6 @@ RUN --mount=source=configure.sh,target=/usr/bin/configure.sh IS_GCC_BUILD=1 conf
         --prefix=/var/install/binutils \
         --with-build-sysroot=/var/install/gcc/sysroot \
         --with-lib-path=/var/install/glibc/usr/lib \
-        CFLAGS="-O2 -falign-functions=32" \
-        LDFLAGS="-Wl,-z,max-page-size=0x1000" \
         || (cat config.log && exit 1)
 RUN make --jobs $(nproc)
 RUN make install
@@ -344,6 +337,15 @@ RUN --mount=source=dedup,target=/usr/bin/dedup dedup /var/builds/toolchain
 # We patch the shared libraries to set the rpath to $ORIGIN, so that during runtime the
 # libraries are found in the same directory as the executable.
 COPY --from=patchelf_download /downloads/patchelf /var/install/patchelf
-RUN find /var \
+RUN find /var/builds/toolchain \
         -name '*.so*' \
         -exec /var/install/patchelf/bin/patchelf --set-rpath '$ORIGIN/' {} \;
+
+RUN find /var/builds/toolchain/bin -type f \
+        -exec strip \
+            --strip-all \
+            --remove-section=.comment \
+            --remove-section=.note \
+            --remove-section=.eh_frame \
+            --remove-section=.eh_frame_hdr \
+            {} \;

sysroot/configure.sh

@@ -83,4 +83,17 @@ export STRIP="${toolchain_prefix}-strip"
 
 args+=("${@}")
 
+readonly common_flags=(
+    -O2
+    -falign-functions=32
+    -ffunction-sections
+    -fdata-sections
+)
+
+args+=(
+    CFLAGS="${common_flags[*]}"
+    CXXFLAGS="${common_flags[*]}"
+    LDFLAGS="-Wl,-z,max-page-size=0x1000 -Wl,--strip-all -Wl,--as-needed"
+)
+
 ../configure "${args[@]}" 1> >(tee configure.stdout) 2> >(>&2 tee configure.stderr)

sysroot/gcc-toolchain-aarch64.tar.xz

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:ba19e9a6cc7cc64930263a9a1126c3dbdad6bdc8b0f2e8e2d38377d84e8d52fe
-size 146755452
+oid sha256:1ee2734713ab3329e4c416ecf55aa6177d9d33dc654659ef612f5e2956f6c01d
+size 118165348

sysroot/gcc-toolchain-armv7.tar.xz

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:975212e47be7bd979a2c98abd2c25361eb8cc482175accb2bf936ad7b044b068
-size 109767980
+oid sha256:b04b10d5ae97796a0e06abf59c05de96a13134f0d7d45cd193148de5aa009c82
+size 97197372

sysroot/gcc-toolchain-x86_64.tar.xz

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:e07a63499c0c608d765e653cecf816f30920d57f824cc8549890f8b444ef309e
-size 479900468
+oid sha256:a2e95cb78cdcef2989231497d1eb28fdc924d4bf9859c76e7509dfdd37aa9131
+size 133241152