--- a/auto/endianness
+++ b/auto/endianness
@@ -21,7 +21,7 @@ int main() {
 
 END
 
-ngx_test="$CC $CC_TEST_FLAGS $CC_AUX_FLAGS \
+ngx_test="$CC $NGX_CC_OPT $CC_TEST_FLAGS $CC_AUX_FLAGS \
           -o $NGX_AUTOTEST $NGX_AUTOTEST.c $NGX_LD_OPT $ngx_feature_libs"
 
 eval "$ngx_test >> $NGX_AUTOCONF_ERR 2>&1"
--- a/auto/feature
+++ b/auto/feature
@@ -39,7 +39,7 @@ int main() {
 END
 
 
-ngx_test="$CC $CC_TEST_FLAGS $CC_AUX_FLAGS $ngx_feature_inc_path \
+ngx_test="$CC $NGX_CC_OPT $CC_TEST_FLAGS $CC_AUX_FLAGS $ngx_feature_inc_path \
           -o $NGX_AUTOTEST $NGX_AUTOTEST.c $NGX_TEST_LD_OPT $ngx_feature_libs"
 
 ngx_feature_inc_path=
--- a/auto/include
+++ b/auto/include
@@ -27,7 +27,7 @@ int main() {
 END
 
 
-ngx_test="$CC -o $NGX_AUTOTEST $NGX_AUTOTEST.c"
+ngx_test="$CC $NGX_CC_OPT -o $NGX_AUTOTEST $NGX_AUTOTEST.c"
 
 eval "$ngx_test >> $NGX_AUTOCONF_ERR 2>&1"