Fix msan compilation warnings, see af38074874c605f9 upstream

0001-Fix-strict-aliasing-warning-in-msan.cpp.patch

@@ -0,0 +1,68 @@
+From af38074874c605f9e598ae3f7e5d4befa3fe92bb Mon Sep 17 00:00:00 2001
+From: serge-sans-paille <sguelton@redhat.com>
+Date: Thu, 28 May 2020 17:50:31 +0200
+Subject: [PATCH] Fix strict aliasing warning in msan.cpp
+
+Use internal_memcpy instead.
+
+Differential Revision: https://reviews.llvm.org/D80732
+---
+ compiler-rt/lib/msan/msan.cpp | 21 ++++++++++++++-------
+ 1 file changed, 14 insertions(+), 7 deletions(-)
+
+diff --git compiler-rt.orig/lib/msan/msan.cpp compiler-rt/lib/msan/msan.cpp
+index 7095ee1bf20..8c789901adc 100644
+--- compiler-rt.orig/lib/msan/msan.cpp
++++ compiler-rt/lib/msan/msan.cpp
+@@ -617,34 +617,41 @@ u32 __msan_get_umr_origin() {
+ }
+ 
+ u16 __sanitizer_unaligned_load16(const uu16 *p) {
+-  *(uu16 *)&__msan_retval_tls[0] = *(uu16 *)MEM_TO_SHADOW((uptr)p);
++  internal_memcpy(&__msan_retval_tls[0], (void *)MEM_TO_SHADOW((uptr)p),
++                  sizeof(uu16));
+   if (__msan_get_track_origins())
+     __msan_retval_origin_tls = GetOriginIfPoisoned((uptr)p, sizeof(*p));
+   return *p;
+ }
+ u32 __sanitizer_unaligned_load32(const uu32 *p) {
+-  *(uu32 *)&__msan_retval_tls[0] = *(uu32 *)MEM_TO_SHADOW((uptr)p);
++  internal_memcpy(&__msan_retval_tls[0], (void *)MEM_TO_SHADOW((uptr)p),
++                  sizeof(uu32));
+   if (__msan_get_track_origins())
+     __msan_retval_origin_tls = GetOriginIfPoisoned((uptr)p, sizeof(*p));
+   return *p;
+ }
+ u64 __sanitizer_unaligned_load64(const uu64 *p) {
+-  __msan_retval_tls[0] = *(uu64 *)MEM_TO_SHADOW((uptr)p);
++  internal_memcpy(&__msan_retval_tls[0], (void *)MEM_TO_SHADOW((uptr)p),
++                  sizeof(uu64));
+   if (__msan_get_track_origins())
+     __msan_retval_origin_tls = GetOriginIfPoisoned((uptr)p, sizeof(*p));
+   return *p;
+ }
+ void __sanitizer_unaligned_store16(uu16 *p, u16 x) {
+-  u16 s = *(uu16 *)&__msan_param_tls[1];
+-  *(uu16 *)MEM_TO_SHADOW((uptr)p) = s;
++  static_assert(sizeof(uu16) == sizeof(u16), "incompatible types");
++  u16 s;
++  internal_memcpy(&s, &__msan_param_tls[1], sizeof(uu16));
++  internal_memcpy((void *)MEM_TO_SHADOW((uptr)p), &s, sizeof(uu16));
+   if (s && __msan_get_track_origins())
+     if (uu32 o = __msan_param_origin_tls[2])
+       SetOriginIfPoisoned((uptr)p, (uptr)&s, sizeof(s), o);
+   *p = x;
+ }
+ void __sanitizer_unaligned_store32(uu32 *p, u32 x) {
+-  u32 s = *(uu32 *)&__msan_param_tls[1];
+-  *(uu32 *)MEM_TO_SHADOW((uptr)p) = s;
++  static_assert(sizeof(uu32) == sizeof(u32), "incompatible types");
++  u32 s;
++  internal_memcpy(&s, &__msan_param_tls[1], sizeof(uu32));
++  internal_memcpy((void *)MEM_TO_SHADOW((uptr)p), &s, sizeof(uu32));
+   if (s && __msan_get_track_origins())
+     if (uu32 o = __msan_param_origin_tls[2])
+       SetOriginIfPoisoned((uptr)p, (uptr)&s, sizeof(s), o);
+-- 
+2.25.2
+

compiler-rt.spec

@@ -4,7 +4,7 @@
 %endif
 
 #%%global rc_ver 6
-%global baserelease 1
+%global baserelease 2
 
 %global crt_srcdir compiler-rt-%{version}%{?rc_ver:rc%{rc_ver}}.src
 
@@ -31,6 +31,7 @@ Source3:	https://github.com/llvm/llvm-project/releases/download/llvmorg-%{versio
 Source2:	https://prereleases.llvm.org/%{version}/hans-gpg-key.asc
 
 Patch0:		0001-PATCH-std-thread-copy.patch
+Patch1:		0001-Fix-strict-aliasing-warning-in-msan.cpp.patch
 
 BuildRequires:	gcc
 BuildRequires:	gcc-c++
@@ -127,6 +128,9 @@ fi
 %endif
 
 %changelog
+* Thu Jun 11 2020 sguelton@redhat.com - 10.0.0-2
+- Fix msan compilation warnings, see af38074874c605f9 upstream
+
 * Mon Mar 30 2020 sguelton@redhat.com - 10.0.0-1
 - 10.0.0 final