Issue #27453: CPP invocation in configure must use CPPFLAGS.
Patch by Chi Hsuan Yen.
diff --git a/configure b/configure
index f0cf515..bb89a5a 100755
--- a/configure
+++ b/configure
@@ -5369,7 +5369,7 @@
EOF
-if $CPP conftest.c >conftest.out 2>/dev/null; then
+if $CPP $CPPFLAGS conftest.c >conftest.out 2>/dev/null; then
PLATFORM_TRIPLET=`grep -v '^#' conftest.out | grep -v '^ *$' | tr -d ' '`
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $PLATFORM_TRIPLET" >&5
$as_echo "$PLATFORM_TRIPLET" >&6; }