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prod_image_util: install GCC libraries to /usr/lib

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Normally GCC is installed in a way that allows installing multiple
versions and switching between them. Our production images do not need
this and additionally the only things from the GCC package that are
needed are the shared libraries. To ensure these libraries are *always*
locatable regardless of the presence of /etc/ld.so.conf and
/etc/ld.so.cache we can install those libraries to plain old /usr/lib.
The GCC packages don't have a built in way to do this but we can get
away with extracting the libraries directly from the binary package.

This is actually similar to what ChromeOS did with a few exceptions:
 - We use a native GCC build instead of the cross toolchain
 - The archive is properly extracted from the package instead of feeding
   the package directly to tar and ignoring the resulting warnings.

As an added benefit switching from a blacklist to a whitelist ensures
that extra cruft does not slip through the cracks, saving 5-10MB.
This commit is contained in:
Michael Marineau 2014-08-27 20:08:19 -07:00
parent 8a3a5e1c51
commit 70051bf6ef
1 changed files with 16 additions and 16 deletions
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32
build_library/prod_image_util.sh
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@ -5,24 +5,24 @@
# The GCC package includes both its libraries and the compiler.
# In prod images we only need the shared libraries.
emerge_prod_gcc() {
extract_prod_gcc() {
local root_fs_dir="$1"; shift
local mask="${INSTALL_MASK:-$(portageq-$BOARD envvar INSTALL_MASK)}"
test -n "$mask" || die "INSTALL_MASK not defined"
local gcc=$(portageq-${BOARD} best_version "${BOARD_ROOT}" sys-devel/gcc)
local pkg="$(portageq-${BOARD} pkgdir)/${gcc}.tbz2"
mask="${mask}
/usr/bin
/usr/*/gcc-bin
/usr/lib/gcc/*/*/*.o
/usr/lib/gcc/*/*/include
/usr/lib/gcc/*/*/include-fixed
/usr/lib/gcc/*/*/plugin
/usr/libexec
/usr/share/gcc-data/*/*/c89
/usr/share/gcc-data/*/*/c99
/usr/share/gcc-data/*/*/python"
if [[ ! -f "${pkg}" ]]; then
die "Binary package missing: $pkg"
fi
INSTALL_MASK="${mask}" emerge_to_image "${root_fs_dir}" --nodeps sys-devel/gcc "$@"
# Normally GCC's shared libraries are installed to:
# /usr/lib/gcc/x86_64-cros-linux-gnu/$version/*
# Instead we extract them to plain old /usr/lib
qtbz2 -O -t "${pkg}" | \
sudo tar -C "${root_fs_dir}" -xj \
--transform 's#/usr/lib/.*/#/usr/lib/#' \
--wildcards './usr/lib/gcc/*.so*'
package_provided "${gcc}"
}
create_prod_image() {
@ -39,7 +39,7 @@ create_prod_image() {
# Install minimal GCC (libs only) and then everything else
set_image_profile prod
emerge_prod_gcc "${root_fs_dir}"
extract_prod_gcc "${root_fs_dir}"
emerge_to_image "${root_fs_dir}" coreos-base/coreos
write_packages "${root_fs_dir}" "${BUILD_DIR}/${image_packages}"