[Buildroot] [PATCH 1/1] package/readline: propagate CONF_OPTS to host build

[Buildroot] [PATCH 1/1] package/readline: propagate CONF_OPTS to host build

[Ronan Loftus]

--with-shared-termcap-library is only applied to the target readline
because CONF_OPTS is not inherited by the host variant. The resulting
host libreadline.so.8 has no DT_NEEDED on ncurses/tinfo, leaving
termcap symbols (UP, BC, tgetent, ...) unresolved.

With recent binutils (--no-copy-dt-needed-entries), any process
loading this libreadline via LD_LIBRARY_PATH fails at startup. This
breaks fakeroot-based rootfs generation when host-gdb (which pulls
host-readline) is selected:

  /bin/sh: symbol lookup error: .../host/lib/libreadline.so.8:
  undefined symbol: UP

Reproduced on Arch Linux (gcc 16.1.1, binutils 2.46.1).

Signed-off-by: Ronan Loftus <rlf42@posteo.net>
---
 package/readline/readline.mk | 1 +
 1 file changed, 1 insertion(+)

diff --git a/package/readline/readline.mk b/package/readline/readline.mk
index f69cbe45..8c49fab8 100644
--- a/package/readline/readline.mk
+++ b/package/readline/readline.mk
@@ -15,6 +15,7 @@ READLINE_CONF_OPTS = \
 	--disable-install-examples \
 	--with-curses \
 	--with-shared-termcap-library
+HOST_READLINE_CONF_OPTS = $(READLINE_CONF_OPTS)
 READLINE_LICENSE = GPL-3.0+
 READLINE_LICENSE_FILES = COPYING
 READLINE_CPE_ID_VENDOR = gnu
-- 
2.55.0

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Re: [Buildroot] [PATCH 1/1] package/readline: propagate CONF_OPTS to host build

[Thomas Petazzoni via buildroot]

On Sun, Jul 19, 2026 at 03:16:04AM +0000, Ronan Loftus wrote:
> --with-shared-termcap-library is only applied to the target readline
> because CONF_OPTS is not inherited by the host variant. The resulting
> host libreadline.so.8 has no DT_NEEDED on ncurses/tinfo, leaving
> termcap symbols (UP, BC, tgetent, ...) unresolved.
> 
> With recent binutils (--no-copy-dt-needed-entries), any process
> loading this libreadline via LD_LIBRARY_PATH fails at startup. This
> breaks fakeroot-based rootfs generation when host-gdb (which pulls
> host-readline) is selected:
> 
>   /bin/sh: symbol lookup error: .../host/lib/libreadline.so.8:
>   undefined symbol: UP
> 
> Reproduced on Arch Linux (gcc 16.1.1, binutils 2.46.1).

Could you provide some detailed reproduction instructions? I did a
build of host-gdb in an Arch Linux container, and the resulting gdb
binary runs just fine... apparently because it is itself directly
linked with libncurses.

> diff --git a/package/readline/readline.mk b/package/readline/readline.mk
> index f69cbe45..8c49fab8 100644
> --- a/package/readline/readline.mk
> +++ b/package/readline/readline.mk
> @@ -15,6 +15,7 @@ READLINE_CONF_OPTS = \
>  	--disable-install-examples \
>  	--with-curses \
>  	--with-shared-termcap-library
> +HOST_READLINE_CONF_OPTS = $(READLINE_CONF_OPTS)

We don't want to do that, we really want a separate
HOST_READLINE_CONF_OPTS, even if today it will carry the same value as
READLINE_CONF_OPTS. There is in general no reason for the host and
target variants of a package to share the same configuration options.

Best regards,

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