File 1085-erts-Add-diagnostic-suppress-as-sctp-header-is-incor.patch of Package erlang

From 412e2c434c5d47ba86d65e26cc7d7c09a80f1204 Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang.org>
Date: Tue, 3 Nov 2020 08:22:11 +0100
Subject: [PATCH 02/11] erts: Add diagnostic suppress as sctp header is
 incorrect

See https://lore.kernel.org/patchwork/patch/1108122/
---
 erts/configure.in                       | 14 ++++++++++
 erts/emulator/drivers/common/inet_drv.c | 34 +++++++++++++++++++++++++
 2 files changed, 48 insertions(+)

diff --git a/erts/configure.in b/erts/configure.in
index f60bbd515e..70dceabcfe 100644
--- a/erts/configure.in
+++ b/erts/configure.in
@@ -3526,6 +3526,20 @@ dnl Check for log2
 dnl ----------------------------------------------------------------------
 AC_CHECK_FUNCS([log2])
 
+dnl ----------------------------------------------------------------------
+dnl Check for GCC diagnostic ignored "-Waddress-of-packed-member"
+dnl ----------------------------------------------------------------------
+saved_CFLAGS="$CFLAGS"
+CFLAGS="-Werror $CFLAGS"
+AC_TRY_COMPILE([],
+        [_Pragma("GCC diagnostic push")
+         _Pragma("GCC diagnostic ignored \"-Waddress-of-packed-member\"")
+         _Pragma("GCC diagnostic pop")
+         ],
+         AC_DEFINE(HAVE_GCC_DIAG_IGNORE_WADDRESS_OF_PACKED_MEMBER,[1],
+           [define if compiler support _Pragma('GCC diagnostic ignored '-Waddress-of-packed-member'')]))
+CFLAGS="$saved_CFLAGS"
+
 dnl ----------------------------------------------------------------------
 dnl Enable any -Werror flags
 dnl ----------------------------------------------------------------------
diff --git a/erts/emulator/drivers/common/inet_drv.c b/erts/emulator/drivers/common/inet_drv.c
index 301a133d3a..87128b2d4d 100644
--- a/erts/emulator/drivers/common/inet_drv.c
+++ b/erts/emulator/drivers/common/inet_drv.c
@@ -82,6 +82,32 @@
 /* All platforms fail on malloc errors. */
 #define FATAL_MALLOC
 
+/* The linux kernel sctp include files have an alignment bug
+   that causes warnings of this type to appear:
+
+   drivers/common/inet_drv.c:3196:47: error: taking address of packed member of 'struct sctp_paddr_change' may result in an unaligned pointer value [-Werror=address-of-packed-member]
+   3196 |      i = load_inet_get_address(spec, i, desc, &sptr->spc_aaddr);
+
+   So we need to suppress those, without disabling all warning
+   diagnostics of that type.
+
+   See https://lore.kernel.org/patchwork/patch/1108122/ for the
+   patch that fixes this bug. In a few years we should be able to
+   remove this suppression. */
+#ifdef HAVE_GCC_DIAG_IGNORE_WADDRESS_OF_PACKED_MEMBER
+#define PUSH_SUPPRESS_ADDRESS_OF_PACKED_MEMBER()                        \
+    _Pragma("GCC diagnostic push")                                      \
+    _Pragma("GCC diagnostic ignored \"-Waddress-of-packed-member\"")    \
+    do { } while(0)
+#define POP_SUPPRESS_ADDRESS_OF_PACKED_MEMBER() \
+    _Pragma("GCC diagnostic pop")               \
+    do { } while(0)
+#else
+#define PUSH_SUPPRESS_ADDRESS_OF_PACKED_MEMBER() \
+    do { } while(0)
+#define POP_SUPPRESS_ADDRESS_OF_PACKED_MEMBER() \
+    do { } while(0)
+#endif
 
 #include "erl_driver.h"
 
@@ -3193,7 +3219,9 @@ static int sctp_parse_async_event
 	    ASSERT(sptr->spc_length <= sz);  /* No buffer overrun */
 
 	    i = LOAD_ATOM	(spec, i, am_sctp_paddr_change);
+            PUSH_SUPPRESS_ADDRESS_OF_PACKED_MEMBER();
 	    i = load_inet_get_address(spec, i, desc, &sptr->spc_aaddr);
+            POP_SUPPRESS_ADDRESS_OF_PACKED_MEMBER();
 
 	    switch (sptr->spc_state)
 	    {
@@ -8150,7 +8178,9 @@ static int load_paddrinfo (ErlDrvTermData * spec, int i,
 {
     i = LOAD_ATOM	(spec, i, am_sctp_paddrinfo);
     i = LOAD_ASSOC_ID	(spec, i, pai->spinfo_assoc_id);
+    PUSH_SUPPRESS_ADDRESS_OF_PACKED_MEMBER();
     i = load_inet_get_address(spec, i, desc, &pai->spinfo_address);
+    POP_SUPPRESS_ADDRESS_OF_PACKED_MEMBER();
     switch(pai->spinfo_state)
     {
     case SCTP_ACTIVE:
@@ -8670,7 +8700,9 @@ static ErlDrvSSizeT sctp_fill_opts(inet_descriptor* desc,
 		ASSERT(0);
 	    }
 	    i = LOAD_ASSOC_ID	(spec, i, sp.sspp_assoc_id);
+            PUSH_SUPPRESS_ADDRESS_OF_PACKED_MEMBER();
 	    i = load_inet_get_address(spec, i, desc, &sp.sspp_addr);
+            POP_SUPPRESS_ADDRESS_OF_PACKED_MEMBER();
 	    i = LOAD_TUPLE	(spec, i, 3);
 	    i = LOAD_TUPLE	(spec, i, 2);
 	    break;
@@ -8730,7 +8762,9 @@ static ErlDrvSSizeT sctp_fill_opts(inet_descriptor* desc,
 	    i = LOAD_ATOM	(spec, i, am_sctp_peer_addr_params);
 	    i = LOAD_ATOM	(spec, i, am_sctp_paddrparams);
 	    i = LOAD_ASSOC_ID	(spec, i, ap.spp_assoc_id);
+            PUSH_SUPPRESS_ADDRESS_OF_PACKED_MEMBER();
 	    i = load_inet_get_address(spec, i, desc, &ap.spp_address);
+            POP_SUPPRESS_ADDRESS_OF_PACKED_MEMBER();
 	    i = LOAD_INT	(spec, i, ap.spp_hbinterval);
 	    i = LOAD_INT	(spec, i, ap.spp_pathmaxrxt);
 	    
-- 
2.26.2