- Avoid out of bounds array index diagnostic with gcc-11

libpsm2-gcc11.patch

@@ -0,0 +1,26 @@
+diff -Nrup a/include/linux-i386/sysdep.h b/include/linux-i386/sysdep.h
+--- a/include/linux-i386/sysdep.h	2019-10-03 20:00:29.000000000 -0600
++++ b/include/linux-i386/sysdep.h	2020-10-19 16:10:45.680585173 -0600
+@@ -139,12 +139,18 @@ static __inline__ uint32_t ips_cmpxchg(v
+ 				       uint32_t old_val, uint32_t new_val)
+ {
+ 	uint32_t prev;
+-	struct xchg_dummy {
+-		uint32_t a[100];
+-	};
+ 
++	/* This code used to cast PTR to a type which was an array of 100
++	   uint32_t objects.  That makes no sense as the cmpxchgl's side
++	   effect can be covered by an single int.
++
++	   The semantics of GCC's ASMs for memory is that it clobbers the
++	   whole pointed-to object.  Thus analyzers saw a 100 uint32_t sized
++	   store which triggers diagnostics for out of bounds array writes.
++
++	   The cast to the dummy type has been removed.  */
+ 	asm volatile (LOCK_PREFIX "cmpxchgl %1,%2" : "=a"(prev)
+-		      : "q"(new_val), "m"(*(struct xchg_dummy *)ptr), "0"(old_val)
++		      : "q"(new_val), "m"(*ptr), "0"(old_val)
+ 		      : "memory");
+ 
+ 	return prev;

libpsm2.spec

@@ -53,7 +53,7 @@
 Summary: Intel PSM Libraries
 Name: libpsm2
 Version: 11.2.86
-Release: 6%{?dist}
+Release: 7%{?dist}
 License: BSD or GPLv2
 URL: https://github.com/01org/opa-psm2/
 
@@ -65,6 +65,7 @@ URL: https://github.com/01org/opa-psm2/
 Source0: %{name}-%{version}.tar.gz
 Patch0: 0001-Fix-multiple-definition-issues.patch
 Patch1: makefile-distro-from-environment.patch
+Patch2: %{name}-gcc11.patch
 
 # The OPA product is supported on x86 64 only:
 ExclusiveArch: x86_64
@@ -105,6 +106,7 @@ Support for MPIs linked with PSM versions < 2
 %setup -q
 %patch0 -p1
 %patch1 -p1
+%patch2 -p1
 
 %build
 %{set_build_flags}
@@ -150,6 +152,9 @@ rm -f %{buildroot}%{_libdir}/*.a
 %endif
 
 %changelog
+* Mon Oct 19 2020 Jeff Law <law@redhat.com> - 11.2.86-7
+- Avoid out of bounds array index diagnostic with gcc-11
+
 * Tue Jul 28 2020 Fedora Release Engineering <releng@fedoraproject.org> - 11.2.86-6
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild