From ac3ffa95e1e6a529cbe08a9f134b1729ea40c213 Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Mon, 15 Mar 2021 16:26:05 -0400
Subject: build: Check for required functions

---
diff --git a/configure.ac b/configure.ac
index 4785bb4..5143bf7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -33,6 +33,17 @@ AC_PROG_CC()
 AM_PROG_CC_C_O()
 test -d "${srcdir}/.git" || CFLAGS="${save_CFLAGS}"
 
+funcs_missing=false
+AC_CHECK_FUNCS(
+	[\
+		free malloc printf putchar sscanf strcmp strdup vprintf
+	],
+	[],
+	[funcs_missing=true])
+if ${funcs_missing}; then
+	AC_MSG_ERROR([required functions are missing])
+fi
+
 AX_CFLAGS_WARN_ALL()  dnl Adds -Wall or equivalent
 AX_CHECK_COMPILE_FLAG([-Wpedantic], [AX_APPEND_FLAG([-Wpedantic])])
 AX_CHECK_COMPILE_FLAG([-Wextra],    [AX_APPEND_FLAG([-Wextra])])
--
cgit v0.9.1