From d65c062a42bb906981aeed7c2739944937172c09 Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: May 31 2021 09:58:19 +0000
Subject: build system: configure: config_host(): added freestanding environment support.


---

diff --git a/configure b/configure
index 725cd6f..f770ae1 100755
--- a/configure
+++ b/configure
@@ -859,8 +859,22 @@ config_host()
 
 	mb_cfghost_cflags="${mb_cfghost_cflags#*: }"
 
-	printf 'int main(void){return 0;}' \
-		> "$mb_cfghost_tmpname"
+	if [ $mb_cc_environment = 'freestanding' ]; then
+		if [ -z "mb_cc_underscore" ]; then
+			mb_cfghost_start_fn='_start'
+		else
+			mb_cfghost_start_fn='start'
+		fi
+
+		printf 'int %s(void){return 0;}' "$mb_cfghost_start_fn" \
+			> "$mb_cfghost_tmpname"
+
+		mb_cfghost_cflags="$mb_cfghost_cflags -ffreestanding"
+		mb_cfghost_cflags="$mb_cfghost_cflags -nostdlib"
+	else
+		printf 'int main(void){return 0;}' \
+			> "$mb_cfghost_tmpname"
+	fi
 
 	# log
 	printf '\n' >&3