dreieck:

When I build OpenWRT with the options
CONFIG_PKG_ASLR_PIE=y
CONFIG_BUSYBOX_DEFAULT_PIE=y
CONFIG_BUSYBOX_CONFIG_PIE=y

build will fail after some time with
mips-openwrt-linux-musl-ld: unrecognized option '-specs=[...]/include/hardened-ld-pie.specs'

Disabling this options mitigates this build error.

The build was carried out on a git clone with latest commit from 2018-02-24T11:24:20+01:00, commit hash 9a0cc49.

To build, a git clone was used, then a previously generated config file by make menuconfig and ./scripts/diffconfig.sh was copied over to .config.

The commands used to build from there were:
make -j1 V=s defconfig
make -j1 V=s download
make -j1 V=s IGNORE_ERRORS=m 2>%1 | tee make.log

Attached you find:

• The diffconfig file used,
• the .config file used (generated after a make defconfig),
• the last parts of the output of make -j1 V=s IGNORE_ERRORS=m 2>&1.

The hardware I tried to build for is
CONFIG_TARGET_lantiq=y
CONFIG_TARGET_lantiq_xway=y
CONFIG_TARGET_lantiq_xway_DEVICE_arcadyan_arv752dpw22=y

The toolchain (staging_dir/toolchain-*) is mips_24kc_gcc-5.5.0_musl.

Build is carried out on a x86_64 Arch Linux machine.