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cb4c0c9a93
usrmerge nowaday required by systemd [1] but it broke
external-arm-toolchain in several ways...
When usrmerge is enabled, /lib is no longer part of SYSROOT_DIRS list
while the prebuilt toolchain expect the dynamic loader to be placed in
/lib not /usr/lib.
There is no /lib directory in the per-package sysroot directory
generated to build each package:
[...]/build/tmp/sysroots-components/<target>/<package>/
sysroot-providers/ usr/
But the cross-compiler still generate binaries with dynamic loarder
path set to "/lib/ld-linux-<target>.so*"
strings sanitycheckc_cross.exe | grep ld
/lib/ld-linux-aarch64.so.1
A symlink /lib -> /usr/lib is crated in the final rootfs image.
But this broke the meson-qemuwrapper used when "qemu-usermode"
(MACHINE_FEATURES) is available:
See [2]:
do_write_config:append:class-target() {
# Write out a qemu wrapper that will be used as exe_wrapper so that meson
# can run target helper binaries through that.
qemu_binary="${@qemu_wrapper_cmdline(d, '$STAGING_DIR_HOST', ['$STAGING_DIR_HOST/${libdir}','$STAGING_DIR_HOST/${base_libdir}'])}"
It produce a runtime issue while running a meson sanity check:
meson-qemuwrapper [...]/build/meson-private/sanitycheckc_cross.exe
qemu-aarch64: Could not open '/lib/ld-linux-aarch64.so.1': No such file or directory
Note: The binaries build by the Yocto internal toolchain seems be "patched" [3]
to look at /usr/lib instead of /lib.
We use -Wl,--dynamic-linker to make sure that the cross-compiler
generate binaries using the dynamic loader path defined by usrmerge
for all packages build by Yocto.
[1] https://git.openembedded.org/openembedded-core/commit/?id=802e853eeddf16d73db1900546cc5f045d1fb7ed
[2] https://git.openembedded.org/openembedded-core/tree/meta/classes-recipe/meson.bbclass?h=2024-04.3-scarthgap#n130
[3] https://github.com/openembedded/openembedded-core/blob/scarthgap/meta/recipes-devtools/gcc/gcc/0007-Define-GLIBC_DYNAMIC_LINKER-and-UCLIBC_DYNAMIC_LINKE.patch
Signed-off-by: Romain Naour <romain.naour@smile.fr>
Acked-by: Denys Dmytriyenko <denys@konsulko.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>