build: Use C23 if possible

For broader compiler support, we try both -std=c23 and -std=c2x.  If
neither is supported, we fall back to -std=c17, but we will start
requiring some C23 features as extensions in this mode.

1 files changed, 12 insertions, 0 deletions

diff --git a/build/flags/std.c b/build/flags/std.c
new file mode 100644
index 0000000..6030d1f
--- /dev/null
+++ b/build/flags/std.c
@@ -0,0 +1,12 @@
+// Copyright © Tavian Barnes <tavianator@tavianator.com>
+// SPDX-License-Identifier: 0BSD
+
+/// _CFLAGS += -std=c23
+/// ---
+/// _CFLAGS += -std=c2x
+/// ---
+/// _CFLAGS += -std=c17
+
+int main(void) {
+	return 0;
+}