From 3552b793e3b30f2bba0e77fbda45a86575f4dae6 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Sat, 27 Jul 2024 19:01:18 -0400
Subject: build/flags: Infrastructure to detect compiler flag support

Use it to detect -MD -MP support.
---
 build/flags-if.sh | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100755 build/flags-if.sh

(limited to 'build/flags-if.sh')

diff --git a/build/flags-if.sh b/build/flags-if.sh
new file mode 100755
index 0000000..098b2d3
--- /dev/null
+++ b/build/flags-if.sh
@@ -0,0 +1,16 @@
+#!/bin/sh
+
+# Copyright © Tavian Barnes <tavianator@tavianator.com>
+# SPDX-License-Identifier: 0BSD
+
+# Add flags to a makefile if a build succeeds
+
+set -eu
+
+FLAGS=$(sed -n '\|^///|{s|^/// ||; s|[^=]*= ||; p}' "$1")
+
+if build/cc.sh "$@" $FLAGS; then
+    sed -n 's|^/// \(.*=.*\)|\1|p' "$1"
+else
+    exit 1
+fi
-- 
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