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eclass/sysroot: Sync with Gentoo

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It's from Gentoo commit 68f87a7fe8498f8fd45fef8817e5de596d302cdf.

Signed-off-by: Mathieu Tortuyaux <mtortuyaux@microsoft.com>
This commit is contained in:
Flatcar Buildbot 2025-07-21 07:15:23 +00:00 committed by Mathieu Tortuyaux
parent 9c671a3447
commit 94f7244f0d
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1 changed files with 47 additions and 11 deletions
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56
sdk_container/src/third_party/portage-stable/eclass/sysroot.eclass vendored
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@ -7,7 +7,11 @@
# @AUTHOR:
# James Le Cuirot <chewi@gentoo.org>
# @SUPPORTED_EAPIS: 7 8
# @BLURB: Common functions for using a different sysroot (e.g. cross-compiling)
# @BLURB: Common functions for using a different (sys)root
# @DESCRIPTION:
# This eclass provides common functions to run executables within a different
# root or sysroot, with or without emulation by QEMU. Despite the name, these
# functions can be used in src_* or pkg_* phase functions.
case ${EAPI} in
7|8) ;;
@ -39,7 +43,7 @@ qemu_arch() {
# @FUNCTION: sysroot_make_run_prefixed
# @DESCRIPTION:
# Create a wrapper script for directly running executables within a sysroot
# Create a wrapper script for directly running executables within a (sys)root
# without changing the root directory. The path to that script is returned. If
# no sysroot has been set, then this function returns unsuccessfully.
#
@ -48,19 +52,38 @@ qemu_arch() {
# environment if binfmt_misc has been used with the F flag. It is not feasible
# to add a conditional dependency on QEMU.
sysroot_make_run_prefixed() {
local QEMU_ARCH=$(qemu_arch) SCRIPT MYROOT MYEROOT LIBGCC
if [[ ${EBUILD_PHASE_FUNC} == src_* ]]; then
[[ -z ${SYSROOT} ]] && return 1
SCRIPT="${T}"/sysroot-run-prefixed
MYROOT=${SYSROOT}
MYEROOT=${ESYSROOT}
local SCRIPT="${T}"/sysroot-run-prefixed
local QEMU_ARCH=$(qemu_arch)
# Both methods below might need help to find GCC's libs. GCC might not
# be installed in the SYSROOT. Note that Clang supports this flag too.
LIBGCC=$($(tc-getCC) ${CPPFLAGS} ${CFLAGS} ${LDFLAGS} -print-libgcc-file-name)
LIBGCC=${LIBGCC%/*}
else
[[ -z ${ROOT} ]] && return 1
SCRIPT="${T}"/root-run-prefixed
MYROOT=${ROOT}
MYEROOT=${EROOT}
# Both methods below might need help to find GCC's libraries. GCC might not
# even be installed in the SYSROOT. Note that Clang supports this flag too.
local LIBGCC=$($(tc-getCC) ${CPPFLAGS} ${CFLAGS} ${LDFLAGS} -print-libgcc-file-name)
# Both methods below might need help to find GCC's libs. libc++ systems
# won't have this file, but it's not needed in that case.
if [[ -f ${EROOT}/etc/ld.so.conf.d/05gcc-${CHOST}.conf ]]; then
local LIBGCC_A
mapfile -t LIBGCC_A < "${EROOT}/etc/ld.so.conf.d/05gcc-${CHOST}.conf"
LIBGCC=$(printf "%s:" "${LIBGCC_A[@]/#/${ROOT}}")
LIBGCC=${LIBGCC%:}
fi
fi
if [[ ${QEMU_ARCH} == $(qemu_arch "${CBUILD}") ]]; then
# glibc: ld.so is a symlink, ldd is a binary.
# musl: ld.so doesn't exist, ldd is a symlink.
local DLINKER=$(find "${ESYSROOT}"/usr/bin/{ld.so,ldd} -type l -print -quit 2>/dev/null || die "failed to find dynamic linker")
local DLINKER=$(find "${MYEROOT}"/usr/bin/{ld.so,ldd} -type l -print -quit 2>/dev/null || die "failed to find dynamic linker")
# musl symlinks ldd to ld-musl.so to libc.so. We want the ld-musl.so
# path, not the libc.so path, so don't resolve the symlinks entirely.
@ -70,16 +93,29 @@ sysroot_make_run_prefixed() {
# adjust RUNPATHs, but it is probably good enough.
install -m0755 /dev/stdin "${SCRIPT}" <<-EOF || die
#!/bin/sh
LD_LIBRARY_PATH="\${LD_LIBRARY_PATH}\${LD_LIBRARY_PATH+:}${LIBGCC%/*}:${ESYSROOT}/$(get_libdir):${ESYSROOT}/usr/$(get_libdir)" exec "${DLINKER}" "\${@}"
LD_LIBRARY_PATH="\${LD_LIBRARY_PATH}\${LD_LIBRARY_PATH+:}${LIBGCC}:${MYEROOT}/$(get_libdir):${MYEROOT}/usr/$(get_libdir)" exec "${DLINKER}" "\${@}"
EOF
else
# Use QEMU's environment variables rather than its command line
# arguments to cover both explicit and implicit QEMU usage.
install -m0755 /dev/stdin "${SCRIPT}" <<-EOF || die
#!/bin/sh
QEMU_SET_ENV="\${QEMU_SET_ENV}\${QEMU_SET_ENV+,}LD_LIBRARY_PATH=\${LD_LIBRARY_PATH}\${LD_LIBRARY_PATH+:}${LIBGCC%/*}" QEMU_LD_PREFIX="${SYSROOT}" exec $(type -P "qemu-${QEMU_ARCH}") "\${@}"
QEMU_SET_ENV="\${QEMU_SET_ENV}\${QEMU_SET_ENV+,}LD_LIBRARY_PATH=\${LD_LIBRARY_PATH}\${LD_LIBRARY_PATH+:}${LIBGCC}" QEMU_LD_PREFIX="${MYROOT}" exec $(type -P "qemu-${QEMU_ARCH}") "\${@}"
EOF
fi
echo "${SCRIPT}"
}
# @FUNCTION: sysroot_run_prefixed
# @DESCRIPTION:
# Create a wrapper script with sysroot_make_run_prefixed if necessary, and use
# it to execute the given command, otherwise just execute the command directly.
sysroot_run_prefixed() {
local script
if script=$(sysroot_make_run_prefixed); then
"${script}" "${@}"
else
"${@}"
fi
}