Fix an outdated comment as pointed out in BZ #211256.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@15146 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/NEWS b/NEWS
index 1232c8e..8079ef2 100644
--- a/NEWS
+++ b/NEWS
@@ -72,6 +72,7 @@
 201435  Fix Darwin: -v does not show kernel version
 210028  ppc32: Unhandled instruction vmhraddshs
         = 338095
+211256  Fixed an outdated comment regarding the default platform.
 211926  Avoid compilation warnings in valgrind.h with -pedantic
 226609  Crediting upstream authors in man page
 231257  Valgrind omits path when executing script from shebang line
diff --git a/coregrind/launcher-linux.c b/coregrind/launcher-linux.c
index 08f38c1..a5ebb02 100644
--- a/coregrind/launcher-linux.c
+++ b/coregrind/launcher-linux.c
@@ -341,14 +341,11 @@
    }
 
    /* Select a platform to use if we can't decide that by looking at
-      the executable (eg because it's a shell script).  Note that the
-      default_platform is not necessarily either the primary or
-      secondary build target.  Instead it's chosen to maximise the
-      chances that /bin/sh will work on it.  Hence for a primary
-      target of ppc64-linux we still choose ppc32-linux as the default
-      target, because on most ppc64-linux setups, the basic /bin,
-      /usr/bin, etc, stuff is built in 32-bit mode, not 64-bit
-      mode. */
+      the executable (eg because it's a shell script).  VG_PLATFORM is the
+      default_platform. Its value is defined in coregrind/Makefile.am and
+      typically it is the primary build target. Unless the primary build
+      target is not built is not built in which case VG_PLATFORM is the
+      secondary build target. */
    if ((0==strcmp(VG_PLATFORM,"x86-linux"))    ||
        (0==strcmp(VG_PLATFORM,"amd64-linux"))  ||
        (0==strcmp(VG_PLATFORM,"ppc32-linux"))  ||