commit a4754272958a8368701bb2a8d6b0c224fe3b4e73
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Thu Mar 3 14:51:40 2016 -0800

    Or bit_Prefer_MAP_32BIT_EXEC in EXTRA_LD_ENVVARS
    
    We should turn on bit_Prefer_MAP_32BIT_EXEC in EXTRA_LD_ENVVARS without
    overriding other bits.
    
      [BZ #19758]
      * sysdeps/unix/sysv/linux/x86_64/64/dl-librecon.h
      (EXTRA_LD_ENVVARS): Or bit_Prefer_MAP_32BIT_EXEC.

diff --git a/sysdeps/unix/sysv/linux/x86_64/64/dl-librecon.h b/sysdeps/unix/sysv/linux/x86_64/64/dl-librecon.h
index c9db5ea..a759934 100644
--- a/sysdeps/unix/sysv/linux/x86_64/64/dl-librecon.h
+++ b/sysdeps/unix/sysv/linux/x86_64/64/dl-librecon.h
@@ -33,7 +33,7 @@
   case 21:							      \
     if (memcmp (envline, "PREFER_MAP_32BIT_EXEC", 21) == 0)	      \
       GLRO(dl_x86_cpu_features).feature[index_Prefer_MAP_32BIT_EXEC]  \
-	= bit_Prefer_MAP_32BIT_EXEC;				      \
+	|= bit_Prefer_MAP_32BIT_EXEC;				      \
     break;
 
 /* Extra unsecure variables.  The names are all stuffed in a single