From 6e02b3078b5b80e1a4976759b815264c3b114be6 Mon Sep 17 00:00:00 2001
From: Vadim Yanitskiy <vyanitskiy@sysmocom.de>
Date: Wed, 28 Dec 2022 05:20:49 +0700
Subject: [PATCH] configure.ac: check if LIBTRXCON_DIR (submodule) exists

Fail during the configure stage if the submodule is not fetched.

Change-Id: I06456c2087e160032f5bf8b36304477390f117d0
Related: OS#5599
---
 configure.ac | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 2c4bb288..5d45c279 100644
--- a/configure.ac
+++ b/configure.ac
@@ -212,7 +212,12 @@ AS_IF([test "x$with_bladerf" = "xyes"], [
 AC_MSG_CHECKING([whether to enable building MS TRX])
 AS_IF([test "x$with_mstrx" = "xyes"], [
     AC_CONFIG_SUBDIRS([osmocom-bb/src/host/trxcon])
-    AC_SUBST(LIBTRXCON_DIR, "osmocom-bb/src/host/trxcon")
+    LIBTRXCON_DIR="osmocom-bb/src/host/trxcon"
+    if ! test -d "$LIBTRXCON_DIR"; then
+        AC_MSG_RESULT([no])
+        AC_MSG_ERROR([$LIBTRXCON_DIR does not exist])
+    fi
+    AC_SUBST(LIBTRXCON_DIR)
     AC_MSG_RESULT([yes])
 ], [
     # Despite LIBTRXCON_DIR is added to SUBDIRS conditionally,