[LTP] [PATCH 1/1] autoconf: Use pkg-config for keyutils detection

[Petr Vorel]

> On 2021/1/13 18:39, Petr Vorel wrote:
> > Hi Yang,

> > > On 2021/1/11 20:36, Petr Vorel wrote:
> > > > Using pkg-config is less error prone during cross compilation.
> > > Hi Petr,
> > > Is there any detailed example about the above point?
> > Sometimes I experienced problems during cross compilation with installed library
> > for build architecture but missing library for host architecture build failed
> > during linking because library was expected but missing.

> > But I it turned out to be when using our CROSS_COMPILE implementation (without
> > specifying --host). When configuring with just --host libraries are properly
> > detected with AC_CHECK_LIB().
> Hi Petr,

> Does the issue only happened when we use ./configure without --host?
> In an other word, AC_CHECK_LIB() can detect proper installed libraries for
> build architecture by './configure --host', right?
Yes (but it cannot detect library version).

> > pkg-config has some pros and cons.
> > Pros:
> > * easily require specific library version
> > * getting CFLAGS from *.pc file
> > * IMHO it's a standard way nowadays

> > Cons:
> > * For cross compilation it's reuired to set correctly PKG_CONFIG_LIBDIR.
> Current ltp mixes pkg-config and AC_CHECK_LIB() so I want to unify them.
> We cannot use pkg-config for all libraries because some packages don't
> provide *.pc files.
Yes. But if you want to remove pkg-config, I'd wait for others opinions about
it :).

Kind regards,
Petr

> Best Regards,
> Xiao Yang
> > I brought pkg-config as dependency to LTP due checking libtirpc>= 0.2.4.
> > But this version is already 7 years old so we might not need this version check now.
> > (and one day it'd be best to fix (or rewrite from scratch) rpc/tirpc tests and
> > move them to libtirpc upstream as Sun-RPC was removed from glibc in 2.32).

> > Thus we can safely reconsider if we want pkg-config or not.

> > Kind regards,
> > Petr


> > .