[glibc/maskray/clang] configure: Check -fno-tree-loop-distribute-patterns

[Fangrui Song]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=08461be6ac3c7b09d79bdd0cea2c94afd8b57324

commit 08461be6ac3c7b09d79bdd0cea2c94afd8b57324
Author: Fangrui Song <maskray@google.com>
Date:   Sun Sep 26 00:15:23 2021 -0700

    configure: Check -fno-tree-loop-distribute-patterns

Diff:
---
 configure    | 2 +-
 configure.ac | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/configure b/configure
index 2b9602a6e8..95b7d75624 100755
--- a/configure
+++ b/configure
@@ -6492,7 +6492,7 @@ __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
 foo (void) {}
 EOF
 libc_cv_cc_loop_to_function=no
-if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c'
+if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS -Werror -c conftest.c'
   { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
   (eval $ac_try) 2>&5
   ac_status=$?
diff --git a/configure.ac b/configure.ac
index ade88d089b..07f9807e00 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1596,7 +1596,7 @@ __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
 foo (void) {}
 EOF
 libc_cv_cc_loop_to_function=no
-if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
+if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -Werror -c conftest.c])
 then
   libc_cv_cc_loop_to_function=yes
 fi