Filter out unknown symbols in stack-protector test.

1 files changed, 7 insertions, 0 deletions

diff --git a/configure b/configure
index f23c40f..09a0637 100755
--- a/configure
+++ b/configure
@@ -7696,6 +7696,13 @@ libc_undefs=`$NM -u conftest.o |
   as_fn_error $? "confusing output from $NM -u" "$LINENO" 5
 }
 echo >&5 "libc_undefs='$libc_undefs'"
+# On some architectures, there are architecture-specific undefined
+# symbols (resolved by the linker), so filter out unknown symbols.
+# This will fail to produce the correct result if the compiler
+# defaults to -fstack-protector but this produces an undefined symbol
+# other than __stack_chk_fail.  However, compilers like that have not
+# been encountered in practice.
+libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'`
 case "$libc_undefs" in
 foobar) libc_cv_predef_stack_protector=no ;;
 '__stack_chk_fail