[Buildroot] /bin/ld: skipping incompatible //lib/libpam.so when searching for -lpam

[Peter Seiderer <ps.report@gmx.net>]

On Fri, 26 Feb 2021 21:46:02 -0600 (CST), GA K <guyarkam@gmail.com> wrote:

> The problem is related to the linking of runuser during the  build of
> host-util-linux.
>
> On the first system, the build process completes successfully because the
> host-util-linux configuration script fails to locate PAM header files among
> other things and issues the following warning:
>
> configure: WARNING: ncursesw, ncurses or slang library not found; not
> building irqtop
> configure: WARNING: linux/blkzoned.h header not found; not building blkzone
> checking for LIBUSER... no
> configure: WARNING: PAM header file not found; not building runuser
> checking for ECONF... no
> configure: WARNING: libpython not found; not building pylibmount
> checking that generated files are newer than configure... done
>
> On the second system, the host-util-linux configuration script finds the PAM
> header (I have these lines)
> checking for LIBUSER... no
> checking for ECONF... no
>  and proceeds with the build of runuser. However, on this system (64-bit
> machine)  /lib/libpam.so points to the file libpam.so.0.83.1 which is a
> 32-bit ELF file.
>
> $ file libpam.so.0.83.1
> libpam.so.0.83.1: ELF 32-bit LSB shared object, Intel 80386, version 1
> (SYSV), dynamically linked,
> BuildID[sha1]=75203587ca0241a766a756b1cec17c0fc54dd479, stripped
>
>
> I have no root access to the second machine so my only solution is to skip
> runuser during the host-util-linux build process. I see that
> package/util-linux/Config.in defines BR2_PACKAGE_UTIL_LINUX_RUNUSER and
> automatically selects it when BR2_PACKAGE_LINUX_PAM is selected. In my
> particular case, I am not selecting BR2_PACKAGE_LINUX_PAM and yet runuser
> gets selected. I am hence wondering what would be the safest way to skip
> runuser while building host-util-linux.
>
> Thanks for any hint

Disable runuser for the host build (completely untested):

diff --git a/package/util-linux/util-linux.mk b/package/util-linux/util-linux.mk
index 0178c52bac..09acaca1a7 100644
--- a/package/util-linux/util-linux.mk
+++ b/package/util-linux/util-linux.mk
@@ -211,6 +211,7 @@ HOST_UTIL_LINUX_CONF_OPTS += \
 	--disable-nsenter \
 	--disable-pg \
 	--disable-rfkill \
+	--disable-runuser \
 	--disable-schedutils \
 	--disable-setpriv \
 	--disable-setterm \

Regards,
Peter

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