[Buildroot] [PATCH v5] autofs: allow to use libtirpc instead of internal C implementation

[Yann E. MORIN <yann.morin.1998@free.fr>]

Waldemar, All,

On 2017-06-28 22:45 +0200, Yann E. MORIN spake thusly:
> On 2017-06-28 12:50 +0200, Waldemar Brodkorb spake thusly:
> > +Convert configure.in to use PKG_CHECK_MODULES and remove the
> > +hand written autoconf macros from aclocal.m4.
> > +
> 
> As a reminder for the others: when autoreconfiguring libtirpc with the
> change to use pkg-config, the PKG_CHECK_MODULES macros is not expanded
> during autoreconf, and Waldemar fixed that by explicitly including
> pkg.m4 , where the macro is defined, rather than let autoconf find it
> automatically (it is in its search path, after all). Thus the following:
> 
> > +To autoreconf the package you need pkg-config or pkgconf installed,
> > +which provides the needed autoconf macros in pkg.m4. For an
> > +non-automake project a full path to pkg.m4 is required.
> 
> Are you sure this is the real explanation, that pkg.m4 is not found
> because the projet does not use automake (but just autoconf) ?

So, this is all caused by the aclocal.m4 file in the top-level of autofs
source tree.

Here is a proper fix:

 1. change configure.in to have:
    AC_CONFIG_MACRO_DIR([m4])

 2. as a post-patch hook:
    mkdir $(@D)/m4
    mv $(@D)/aclocal.m4 $(@D)/m4/autofs-macros.m4

And there you go, PKG_CHECK_MODULES is properly expanded now.

So, it looks like aclocal.m4 acts as a kind of "I bundle all I
need, don't look in system include dirs".

Regards,
Yann E. MORIN.

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