[Buildroot] libreadline undefined symbol error when generating rootfs tarball

[Peter Seiderer]

Hello Bagas,

On Tue, 16 Sep 2025 09:11:08 +0700, Bagas Sanjaya <bagasdotme at gmail.com> wrote:

> Hi,
> 
> On my Arch Linux computer, I'm trying to build an aarch64 SDK tarball (target
> gcc 15.2.0, binutils 2.44, custom kernel headers 6.12.x {I'm using 6.12
> mainline release [1]}) with ``make sdk``. This all goes well until generating
> rootfs.tar step, when the build errors out:
> 
> ```
> ␛[7m>>>   Generating filesystem image rootfs.tar␛[27m  
> mkdir -p /home/bagas/repo/buildroot/output/images
> rm -rf /home/bagas/repo/buildroot/output/build/buildroot-fs/tar
> mkdir -p /home/bagas/repo/buildroot/output/build/buildroot-fs/tar
> rsync -auH --exclude=/THIS_IS_NOT_YOUR_ROOT_FILESYSTEM /home/bagas/repo/buildroot/output/target/ /home/bagas/repo/buildroot/output/build/buildroot-fs/tar/target
> echo '#!/bin/sh' > /home/bagas/repo/buildroot/output/build/buildroot-fs/tar/fakeroot
> echo "set -e" >> /home/bagas/repo/buildroot/output/build/buildroot-fs/tar/fakeroot
> echo "chown -h -R 0:0 /home/bagas/repo/buildroot/output/build/buildroot-fs/tar/target" >> /home/bagas/repo/buildroot/output/build/buildroot-fs/tar/fakeroot
> PATH="/home/bagas/repo/buildroot/output/host/bin:/home/bagas/repo/buildroot/output/host/sbin:/home/bagas/.local/bin:/home/bagas/go/bin:/home/bagas/.local/bin:/home/bagas/.cargo/bin:/home/bagas/.nvm/versions/node/v22.19.0/bin:/home/bagas/go/bin:/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl" /home/bagas/repo/buildroot/support/scripts/mkusers /home/bagas/repo/buildroot/output/build/buildroot-fs/full_users_table.txt /home/bagas/repo/buildroot/output/build/buildroot-fs/tar/target >> /home/bagas/repo/buildroot/output/build/buildroot-fs/tar/fakeroot
> echo "/home/bagas/repo/buildroot/output/host/bin/makedevs -d /home/bagas/repo/buildroot/output/build/buildroot-fs/full_devices_table.txt /home/bagas/repo/buildroot/output/build/buildroot-fs/tar/target" >> /home/bagas/repo/buildroot/output/build/buildroot-fs/tar/fakeroot
> printf '   	rm -rf /home/bagas/repo/buildroot/output/build/buildroot-fs/tar/target/usr/lib/udev/hwdb.d/ /home/bagas/repo/buildroot/output/build/buildroot-fs/tar/target/etc/udev/hwdb.d/\n' >> /home/bagas/repo/buildroot/output/build/buildroot-fs/tar/fakeroot
> echo "find /home/bagas/repo/buildroot/output/build/buildroot-fs/tar/target/run/ -mindepth 1 -prune -print0 | xargs -0r rm -rf --" >> /home/bagas/repo/buildroot/output/build/buildroot-fs/tar/fakeroot
> echo "find /home/bagas/repo/buildroot/output/build/buildroot-fs/tar/target/tmp/ -mindepth 1 -prune -print0 | xargs -0r rm -rf --" >> /home/bagas/repo/buildroot/output/build/buildroot-fs/tar/fakeroot
> printf '   \n' >> /home/bagas/repo/buildroot/output/build/buildroot-fs/tar/fakeroot
> printf '   \n' >> /home/bagas/repo/buildroot/output/build/buildroot-fs/tar/fakeroot
> printf '   	(cd /home/bagas/repo/buildroot/output/build/buildroot-fs/tar/target; find -print0 | LC_ALL=C sort -z | tar  --pax-option=exthdr.name=%%d/PaxHeaders/%%f,atime:=0,ctime:=0 -cf /home/bagas/repo/buildroot/output/images/rootfs.tar --null --xattrs-include='\''*'\'' --no-recursion -T - --numeric-owner)\n' >> /home/bagas/repo/buildroot/output/build/buildroot-fs/tar/fakeroot
> chmod a+x /home/bagas/repo/buildroot/output/build/buildroot-fs/tar/fakeroot
> PATH="/home/bagas/repo/buildroot/output/host/bin:/home/bagas/repo/buildroot/output/host/sbin:/home/bagas/.local/bin:/home/bagas/go/bin:/home/bagas/.local/bin:/home/bagas/.cargo/bin:/home/bagas/.nvm/versions/node/v22.19.0/bin:/home/bagas/go/bin:/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl" FAKEROOTDONTTRYCHOWN=1 /home/bagas/repo/buildroot/output/host/bin/fakeroot -- /home/bagas/repo/buildroot/output/build/buildroot-fs/tar/fakeroot
> /bin/sh: symbol lookup error: /home/bagas/repo/buildroot/output/host/lib/libreadline.so.8: undefined symbol: UP
> make: *** [fs/tar/tar.mk:38: /home/bagas/repo/buildroot/output/images/rootfs.tar] Error 127
> ```
> 
> Is it a build regression? Or do I miss something?

The following patch fixed the problem for me:

diff --git a/package/readline/readline.mk b/package/readline/readline.mk
index f69cbe45e2..078607a0c5 100644
--- a/package/readline/readline.mk
+++ b/package/readline/readline.mk
@@ -15,6 +15,10 @@ READLINE_CONF_OPTS = \
 	--disable-install-examples \
 	--with-curses \
 	--with-shared-termcap-library
+HOST_READLINE_CONF_OPTS = \
+	--disable-install-examples \
+	--with-curses \
+	--with-shared-termcap-library
 READLINE_LICENSE = GPL-3.0+
 READLINE_LICENSE_FILES = COPYING
 READLINE_CPE_ID_VENDOR = gnu

Regards,
Peter

> 
> Full config attached.
> 
> Thanks.
> 
> [1]: https://www.kernel.org/pub/linux/kernel/v6.x/linux-6.12.tar.xz
>