The current warning is:
WARNING: glibc: unable to generate header for spray.x

Which is easier to debug than:
WARNING: unable to generate header for spray.x

And remove the file before generate it again to fix the warning when
recompile:
file `bootparam_prot.h' already exists and may be overwritten
WARNING: unable to generate header for bootparam_prot.x
file `nlm_prot.h' already exists and may be overwritten
WARNING: unable to generate header for nlm_prot.x
[snip]

Signed-off-by: Robert Yang <liezhi.y...@windriver.com>
---
 meta/recipes-core/glibc/glibc_2.21.bb |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/meta/recipes-core/glibc/glibc_2.21.bb 
b/meta/recipes-core/glibc/glibc_2.21.bb
index 8197c29..30f1937 100644
--- a/meta/recipes-core/glibc/glibc_2.21.bb
+++ b/meta/recipes-core/glibc/glibc_2.21.bb
@@ -135,7 +135,8 @@ do_compile () {
                cd ${S}/sunrpc/rpcsvc
                for r in ${rpcsvc}; do
                        h=`echo $r|sed -e's,\.x$,.h,'`
-                       rpcgen -h $r -o $h || bbwarn "unable to generate header 
for $r"
+                       rm -f $h
+                       rpcgen -h $r -o $h || bbwarn "${PN}: unable to generate 
header for $r"
                done
        )
        echo "Adjust ldd script"
-- 
1.7.9.5

-- 
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