ppp: fix build against 5.15 headers

The 5.15 kernel has removed ipx support, along with the userspace
visible header.

The build error was found for muslc, since it doesn't have a
fallback header, we disable it for both glibc/muslc.

This support wasn't used previously (as it hasn't been very well
maintained in the kernel for several years), so we can simply
disable it in our build and wait for upstream to do a release that
drops the support.

Although the tarball we use for our build (versus git), doesn't
use the autoconf disable flag to turn off the support, it is included
in this patch in case someone is building via git source base.

Upstream-Status: Inappropriate [OE-specific configuration/headers]

(From OE-Core rev: 2d61b061f52cc8dbed82e2d9547e8b52d3ec9e34)

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 39 insertions, 0 deletions

diff --git a/meta/recipes-connectivity/ppp/ppp/0001-ppp-fix-build-against-5.15-headers.patch b/meta/recipes-connectivity/ppp/ppp/0001-ppp-fix-build-against-5.15-headers.patch
new file mode 100644
index 0000000000..c91246dbf5
--- /dev/null
+++ b/meta/recipes-connectivity/ppp/ppp/0001-ppp-fix-build-against-5.15-headers.patch
@@ -0,0 +1,36 @@
+From aba3273273e826c6dc90f197ca9a3e800e826891 Mon Sep 17 00:00:00 2001
+From: Bruce Ashfield <bruce.ashfield@gmail.com>
+Date: Fri, 5 Nov 2021 12:41:35 -0400
+Subject: [PATCH] ppp: fix build against 5.15 headers
+
+The 5.15 kernel has removed ipx support, along with the userspace
+visible header.
+
+This support wasn't used previously (as it hasn't been very well
+maintained in the kernel for several years), so we can simply
+disable it in our build and wait for upstream to do a release that
+drops the support.
+
+Upstream-Status: Inappropriate [OE-specific configuration/headers]
+
+Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
+---
+ pppd/Makefile.linux | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/pppd/Makefile.linux b/pppd/Makefile.linux
+index 22837c5..23b9b22 100644
+--- a/pppd/Makefile.linux
++++ b/pppd/Makefile.linux
+@@ -91,7 +91,7 @@ MAXOCTETS=y
+ 
+ INCLUDE_DIRS= -I../include
+ 
+-COMPILE_FLAGS= -DHAVE_PATHS_H -DIPX_CHANGE -DHAVE_MMAP -pipe
++COMPILE_FLAGS= -DHAVE_PATHS_H -DHAVE_MMAP -pipe
+ 
+ CFLAGS= $(COPTS) $(COMPILE_FLAGS) $(INCLUDE_DIRS) '-DDESTDIR="@DESTDIR@"'
+ 
+-- 
+2.25.1
+
diff --git a/meta/recipes-connectivity/ppp/ppp_2.4.9.bb b/meta/recipes-connectivity/ppp/ppp_2.4.9.bb
index 235595ff76..bd6435e69c 100644
--- a/meta/recipes-connectivity/ppp/ppp_2.4.9.bb
+++ b/meta/recipes-connectivity/ppp/ppp_2.4.9.bb
@@ -24,6 +24,7 @@ SRC_URI = "https://download.samba.org/pub/${BPN}/${BP}.tar.gz \
            file://ppp_on_boot \
            file://provider \
            file://ppp@.service \
+           file://0001-ppp-fix-build-against-5.15-headers.patch \
            "
 
 SRC_URI[sha256sum] = "f938b35eccde533ea800b15a7445b2f1137da7f88e32a16898d02dee8adc058d"
@@ -39,6 +40,8 @@ EXTRA_OECONF = "--disable-strip"
 #
 EXTRA_OEMAKE += ' COPTS="${CFLAGS} -I${STAGING_INCDIR}/openssl -I${S}/include"'
 
+EXTRA_OECONF:append:libc-musl = " --disable-ipxcp"
+
 do_configure () {
         oe_runconf
 }