[Buildroot] [PATCH v3] autofs: allow to use libtirpc instead of internal C implementation

[Waldemar Brodkorb <wbx@openadk.org>]

Hi Thomas,
Thomas Petazzoni wrote,

> Hello,
> 
> On Thu, 23 Mar 2017 08:10:58 +0100, Waldemar Brodkorb wrote:
> > uClibc-ng plans to remove internal RPC implementation as it
> > is ipv4 only and can not be used for most important RPC software
> > rpcbind and nfs-utils.
> > musl does not implement RPC and GNU C library deprecated the
> > internal implementation a while ago.
> > It is still possible to use the C library implementation.
> > 
> > Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
> 
> This is almost good, but there are still a few issues. I had fixed most
> of them locally, but one needs a bit more work.
> 
> > diff --git a/package/autofs/0004-libtirpc-via-pkgconfig.patch b/package/autofs/0004-libtirpc-via-pkgconfig.patch
> > new file mode 100644
> > index 0000000..784b4c6
> > --- /dev/null
> > +++ b/package/autofs/0004-libtirpc-via-pkgconfig.patch
> > @@ -0,0 +1,83 @@
> > +Use pkg-config to find libtirpc headers
> > +
> > +Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
> 
> Please format your patch with Git. The Git repo is available at
> https://git.kernel.org/pub/scm/linux/storage/autofs/autofs.git/, create
> a branch based on the release_5_1_2 tag, and import the three existing
> patches.

Okay, I understand this.
 
> > ++AC_PATH_PROGS(PKG_CONFIG, pkg-config, no)
> > ++
> > + # save current flags
> > + af_check_libtirpc_save_cflags="$CFLAGS"
> > + af_check_libtirpc_save_ldflags="$LDFLAGS"
> > +-CFLAGS="$CFLAGS -I/usr/include/tirpc"
> > +-LDFLAGS="$LDFLAGS -ltirpc"
> > ++
> > ++TIRPC_LIBS=`$PKG_CONFIG --libs libtirpc`
> > ++TIRPC_FLAGS=`$PKG_CONFIG --cflags libtirpc`
> 
> Please PKG_CHECK_MODULES() instead.

I tried, but failed. Do you have some examples how
PKG_CHECK_MODULES() should be used? I am not a autotool expert, so I
am unsure how to create a patch which will be accepted by upstream.

best regards
 Waldemar