Check if TEST_CC supports -Wno-restrict before using it

Check if TEST_CC supports -Wno-restrict before using it to avoid Clang
error:

error: unknown warning option '-Wno-restrict' [-Werror,-Wunknown-warning-option]

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Reviewed-by: Sam James <sam@gentoo.org>

1 files changed, 34 insertions, 0 deletions

diff --git a/configure b/configure
index 7bc028c..5fb4141 100755
--- a/configure
+++ b/configure
@@ -7969,6 +7969,40 @@ have-test-cc-trampoline = $libc_cv_test_cc_trampolines"
 
 saved_CC="$CC"
 CC="$TEST_CC"
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking -Wno-restrict in testing" >&5
+printf %s "checking -Wno-restrict in testing... " >&6; }
+if test ${libc_cv_test_cflags_wno_restrict+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) if { ac_try='${CC-cc} -c -Werror -Wno-restrict -xc /dev/null -S -o /dev/null'
+  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }
+then :
+  libc_cv_test_cflags_wno_restrict=-Wno-restrict
+else case e in #(
+  e) libc_cv_test_cflags_wno_restrict=
+ ;;
+esac
+fi ;;
+esac
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_test_cflags_wno_restrict" >&5
+printf "%s\n" "$libc_cv_test_cflags_wno_restrict" >&6; }
+
+CC="$saved_CC"
+
+
+config_vars="$config_vars
+test-config-cflags-wno-restrict = $libc_cv_test_cflags_wno_restrict"
+
+
+
+saved_CC="$CC"
+CC="$TEST_CC"
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking -finput-charset=ascii in testing" >&5
 printf %s "checking -finput-charset=ascii in testing... " >&6; }
 if test ${libc_cv_test_cflags_finput_charset_ascii+y}