[Buildroot] [PATCH 0/2] Fix undefined reference errors on SDK tarball build

[Buildroot] [PATCH 0/2] Fix undefined reference errors on SDK tarball build

[Bagas Sanjaya]

Hi,

Here are fixes for undefined reference errors when building buildroot SDK
tarball on Arch Linux host [1].

Tested toolchain configuration:

  * target gcc 15.2.0
  * target binutils 2.44
  * host gdb 16.3
  * custom kernel headers 6.12 (from kernel.org mainline release [2])

Enjoy!

[1]: https://lore.kernel.org/buildroot/aMjHPLJ5qHp_TTju@archie.me/
[2]: https://www.kernel.org/pub/linux/kernel/v6.x/linux-6.12.tar.xz

Bagas Sanjaya (2):
  package/readline: Fix sdk rootfs tarball generation
  package/ncurses: Also build termlib

 package/ncurses/ncurses.mk   | 4 +++-
 package/readline/readline.mk | 4 ++++
 2 files changed, 7 insertions(+), 1 deletion(-)

-- 
An old man doll... just what I always wanted! - Clara

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[Buildroot] [PATCH 1/2] package/readline: Fix sdk rootfs tarball generation

[Bagas Sanjaya]

Generating rootfs.tar when building the sdk fails with undefined
reference error on host libreadline:

␛[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

Fix it by also passing the same configure options as target readline
to host readline.

Link: https://lore.kernel.org/buildroot/aMjHPLJ5qHp_TTju@archie.me/
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
---
 package/readline/readline.mk | 4 ++++
 1 file changed, 4 insertions(+)

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
-- 
An old man doll... just what I always wanted! - Clara

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Re: [Buildroot] [PATCH 1/2] package/readline: Fix sdk rootfs tarball generation

[Thomas Petazzoni via buildroot]

Hello,

On Sat, 20 Sep 2025 14:47:09 +0700
Bagas Sanjaya <bagasdotme@gmail.com> wrote:

> ␛[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

This is not the "sdk rootfs tarball generation", just the "rootfs
tarball generation". SDK and rootfs generation are two separate things.

However, what exactly is using libreadline here? Is it fakeroot?
Something else?

We need a bit more convincing explanation than "adding those lines in
readline.mk fixed the problem for me".

Which tool is linked with readline? Is it working at link time because
host-readline is not already built, then later on, some other package
builds/installs host-readline, and the tool ends up using our
host-readline instead of the system-provided readline?

This definitely need more investigation/explanation before we can apply
the patch.

Thanks!

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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[Buildroot] [PATCH 2/2] package/ncurses: Also build termlib

[Bagas Sanjaya]

As a side effect of readline fix in previous commit, building host-gdb
fails with undefined reference to ncurses error:

  CXX    init.o
  CXXLD  gdb
/usr/bin/ld: /home/bagas/repo/buildroot/output/host/lib/libreadline.so: undefined reference to `tgoto@NCURSES6_TINFO_5.0.19991023'
/usr/bin/ld: /home/bagas/repo/buildroot/output/host/lib/libreadline.so: undefined reference to `UP@NCURSES6_TINFO_5.0.19991023'
/usr/bin/ld: /home/bagas/repo/buildroot/output/host/lib/libreadline.so: undefined reference to `tgetent@NCURSES6_TINFO_5.0.19991023'
/usr/bin/ld: /home/bagas/repo/buildroot/output/host/lib/libreadline.so: undefined reference to `tgetnum@NCURSES6_TINFO_5.0.19991023'
/usr/bin/ld: /home/bagas/repo/buildroot/output/host/lib/libreadline.so: undefined reference to `PC@NCURSES6_TINFO_5.0.19991023'
/usr/bin/ld: /home/bagas/repo/buildroot/output/host/lib/libreadline.so: undefined reference to `tgetstr@NCURSES6_TINFO_5.0.19991023'
/usr/bin/ld: /home/bagas/repo/buildroot/output/host/lib/libreadline.so: undefined reference to `tgetflag@NCURSES6_TINFO_5.0.19991023'
/usr/bin/ld: /home/bagas/repo/buildroot/output/host/lib/libreadline.so: undefined reference to `BC@NCURSES6_TINFO_5.0.19991023'
/usr/bin/ld: /home/bagas/repo/buildroot/output/host/lib/libreadline.so: undefined reference to `tputs@NCURSES6_TINFO_5.0.19991023'
collect2: error: ld returned 1 exit status
make[3]: *** [Makefile:2232: gdb] Error 1

Fix above by also building termlib (libtinfo.so.6) so that host-readline
is linked to ncurses from buildroot instead from host distro.

Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
---
 package/ncurses/ncurses.mk | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/package/ncurses/ncurses.mk b/package/ncurses/ncurses.mk
index 864f62b57c..a837ac96bf 100644
--- a/package/ncurses/ncurses.mk
+++ b/package/ncurses/ncurses.mk
@@ -162,7 +162,9 @@ HOST_NCURSES_CONF_OPTS = \
 	--without-ada \
 	--with-default-terminfo-dir=/usr/share/terminfo \
 	--disable-db-install \
-	--without-normal
+	--without-normal \
+	--with-termlib \
+	--disable-widec
 
 $(eval $(autotools-package))
 $(eval $(host-autotools-package))
-- 
An old man doll... just what I always wanted! - Clara

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Re: [Buildroot] [PATCH 2/2] package/ncurses: Also build termlib

[Thomas Petazzoni via buildroot]

Hello,

Thanks for your patch!

On Sat, 20 Sep 2025 14:47:10 +0700
Bagas Sanjaya <bagasdotme@gmail.com> wrote:

> As a side effect of readline fix in previous commit, building host-gdb
> fails with undefined reference to ncurses error:
> 
>   CXX    init.o
>   CXXLD  gdb
> /usr/bin/ld: /home/bagas/repo/buildroot/output/host/lib/libreadline.so: undefined reference to `tgoto@NCURSES6_TINFO_5.0.19991023'
> /usr/bin/ld: /home/bagas/repo/buildroot/output/host/lib/libreadline.so: undefined reference to `UP@NCURSES6_TINFO_5.0.19991023'
> /usr/bin/ld: /home/bagas/repo/buildroot/output/host/lib/libreadline.so: undefined reference to `tgetent@NCURSES6_TINFO_5.0.19991023'
> /usr/bin/ld: /home/bagas/repo/buildroot/output/host/lib/libreadline.so: undefined reference to `tgetnum@NCURSES6_TINFO_5.0.19991023'
> /usr/bin/ld: /home/bagas/repo/buildroot/output/host/lib/libreadline.so: undefined reference to `PC@NCURSES6_TINFO_5.0.19991023'
> /usr/bin/ld: /home/bagas/repo/buildroot/output/host/lib/libreadline.so: undefined reference to `tgetstr@NCURSES6_TINFO_5.0.19991023'
> /usr/bin/ld: /home/bagas/repo/buildroot/output/host/lib/libreadline.so: undefined reference to `tgetflag@NCURSES6_TINFO_5.0.19991023'
> /usr/bin/ld: /home/bagas/repo/buildroot/output/host/lib/libreadline.so: undefined reference to `BC@NCURSES6_TINFO_5.0.19991023'
> /usr/bin/ld: /home/bagas/repo/buildroot/output/host/lib/libreadline.so: undefined reference to `tputs@NCURSES6_TINFO_5.0.19991023'
> collect2: error: ld returned 1 exit status
> make[3]: *** [Makefile:2232: gdb] Error 1

Since host-gdb builds fine for most people, there must be something
specific to your environment. Could you provide the details of your
host distribution + the exact Buildroot version + minimal Buildroot
defconfig that exhibits the issue so that people can reproduce ?

To be honest, I don't pretend to fully grasp the interactions between
readline, ncurses, termlib, etc. So if you want patches to be merged,
they need to come with detailed and convincing explanations :-)

Thanks a lot!

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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