rdma-core: Use overloadable attribute with clang

This ensures that clang is not fussy about overloading recvfrom()

Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-networking/recipes-support/rdma-core/rdma-core/0001-Use-overloadable-attribute-with-clang.patch

@@ -0,0 +1,42 @@
+From 42976ed0a0160864b41680604ea9cdb3c175cb94 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Wed, 15 Jan 2020 17:48:28 -0800
+Subject: [PATCH] Use overloadable attribute with clang
+
+This is overriding the libc implementation
+
+Upstream-Status: Pending
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+ librdmacm/preload.c | 8 +++++++-
+ 1 file changed, 7 insertions(+), 1 deletion(-)
+
+diff --git a/librdmacm/preload.c b/librdmacm/preload.c
+index d46beb1b..b451de50 100644
+--- a/librdmacm/preload.c
++++ b/librdmacm/preload.c
+@@ -59,6 +59,12 @@
+ #include "cma.h"
+ #include "indexer.h"
+ 
++#ifdef __clang__
++#define OVERLOAD  __attribute__((overloadable)) 
++#else
++#define OVERLOAD
++#endif
++
+ struct socket_calls {
+ 	int (*socket)(int domain, int type, int protocol);
+ 	int (*bind)(int socket, const struct sockaddr *addr, socklen_t addrlen);
+@@ -793,7 +799,7 @@ ssize_t recv(int socket, void *buf, size_t len, int flags)
+ 		rrecv(fd, buf, len, flags) : real.recv(fd, buf, len, flags);
+ }
+ 
+-ssize_t recvfrom(int socket, void *buf, size_t len, int flags,
++ssize_t OVERLOAD recvfrom(int socket, void *buf, size_t len, int flags,
+ 		 struct sockaddr *src_addr, socklen_t *addrlen)
+ {
+ 	int fd;
+-- 
+2.25.0
+

meta-networking/recipes-support/rdma-core/rdma-core_27.0.bb

@@ -9,6 +9,7 @@ BRANCH = "stable-v${@d.getVar('PV').split('.')[0]}"
 SRC_URI = "git://github.com/linux-rdma/rdma-core.git;branch=${BRANCH} \
            file://0001-Remove-man-files-which-cant-be-built.patch \
            file://0001-librdmacm-Use-sched_yield-instead-of-pthread_yield.patch \
+           file://0001-Use-overloadable-attribute-with-clang.patch \
            "
 SRCREV = "84caf035ae6123e2296b72006cd2cf698c65eb46"
 S = "${WORKDIR}/git"