Add mention of -xarch=v8plus for "cas" usage on Solaris/sparc.

diff --git a/src/backend/port/tas/solaris_sparc.s b/src/backend/port/tas/solaris_sparc.s
index 51ba569f8d7697225ddcfaa1f8b3769c0b0bd53c..891e248736bd2cdfd070b08f59983e3d5713dc38 100644 (file)
--- a/src/backend/port/tas/solaris_sparc.s
+++ b/src/backend/port/tas/solaris_sparc.s
@@ -26,6 +26,9 @@ pg_atomic_cas:
    ! that is targeting sparcv8:
    !
    !   http://cvs.opensolaris.org/source/xref/on/usr/src/lib/libc/sparc/threads/sparc.il
+   !
+   ! It is actually possible to use "cas" for sparcv8 binaries if 
+   ! -xarch=v8plus is used for compilation.
 
 #ifdef __sparcv9
    cas     [%o0],%o2,%o1