Re: [ptxdist] pkg-config-wrapper libdir confusion, ABI dynamic-linker path.

[Michael Olbrich <m.olbrich@pengutronix.de>]

On Thu, Apr 22, 2021 at 09:59:06PM +0200, Christian Melki wrote:
> I'm using a crosstool-ng toolchain which adheres to the ld.so ABI path
> for x86_64 (glibc).
> 
> Afaiu, ptxdist does not like multilib.
> But it will happily get the dynamic-linker path which contain a multilib
> description or just a regular lib64 path.
> 
> https://git.pengutronix.de/cgit/ptxdist/tree/scripts/lib/ptxd_make_00-init.sh#n169
> 
> This might be a symbolic link to the real dynamic linker, because a
> demultilibbed toolchain must still adhere to the ABI specifications.
> For x86_64: 64-bit, hard-float, LE: /lib64/ld-linux-x86-64.so.2
> 
> So ptxdist will use lib64 as it's base for libdirs placing various
> libraries in a lib64 path.

Right, that was contributed a long time ago. But since I don't have a
test-case for this, the support for this has not been maintained.


> But when using the pkg-config-wrapper it looks like all libraries are
> only statically set from a something /lib path.
> 
> https://git.pengutronix.de/cgit/ptxdist/tree/scripts/pkg-config-wrapper#n19

Right, and here it get's ugly. I don't want to rely on some external
environment variable here. Maybe just search for the paths:

libdir=( $(find ${prefix} -maxdepth 3 -type d -name pkgconfig )

Would care to provide a patch for this?

Michael

> So building a library yields:
> $ ls -la platform-tracker/sysroot-target/usr/lib64/libmnl.so*
> lrwxrwxrwx 2 xxx users    15 Apr 22 21:01
> platform-tracker/sysroot-target/usr/lib64/libmnl.so -> libmnl.so.0.2.0*
> lrwxrwxrwx 2 xxx users    15 Apr 22 21:01
> platform-tracker/sysroot-target/usr/lib64/libmnl.so.0 -> libmnl.so.0.2.0*
> -rwxr-xr-x 2 xxx users 77216 Apr 22 21:01
> platform-tracker/sysroot-target/usr/lib64/libmnl.so.0.2.0*
> 
> $ ls -la platform-tracker/sysroot-target/usr/lib64/pkgconfig/libmnl.pc
> -rw-r--r-- 2 xxx users 318 Apr 22 21:01
> platform-tracker/sysroot-target/usr/lib64/pkgconfig/libmnl.pc
> 
> In the search for the library:
> PKG_CONFIG_DEBUG_SPEW variable enabling debug spew
> Adding directory
> '/home/xxx/work/tracker/bin/platform-tracker/sysroot-target/usr/lib/pkgconfig'
> from PKG_CONFIG_PATH
> Adding directory
> '/home/xxx/work/tracker/bin/platform-tracker/sysroot-target/usr/share/pkgconfig'
> from PKG_CONFIG_PATH
> Global variable definition 'pc_sysrootdir' = '/'
> Global variable definition 'pc_top_builddir' = '$(top_builddir)'
> Error printing enabled by default due to use of output options besides
> --exists, --atleast/exact/max-version or --list-all. Value of
> --silence-errors: 0
> Error printing enabled
> Adding virtual 'pkg-config' package to list of known packages
> Looking for package 'libmnl'
> Looking for package 'libmnl-uninstalled'
> No package 'libmnl' found
> 
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