libftdi1: add test file

src/libftdi1-test.c

@@ -0,0 +1,38 @@
+/*
+ * This file is part of MXE.
+ * See index.html for further information.
+ */
+
+#include <stdio.h>
+#include <ftdi.h>
+
+int main(int argc, char *argv[])
+{
+    int num_devs;
+    struct ftdi_context *ctx;
+    struct ftdi_device_list *devs = NULL;
+
+    (void)argc;
+    (void)argv;
+
+    ctx = ftdi_new();
+    if (!ctx) {
+        printf("Initialization error.\n");
+        return 1;
+    }
+
+    num_devs = ftdi_usb_find_all(ctx, &devs, 0, 0);
+    if (num_devs < 0) {
+        printf("Device list error: %s.\n", ftdi_get_error_string(ctx));
+        ftdi_free(ctx);
+        return 2;
+    }
+
+    printf("Found %d FTDI devices.\n", (int)num_devs);
+
+    ftdi_list_free(&devs);
+
+    ftdi_free(ctx);
+
+    return 0;
+}

src/libftdi1.mk

@@ -22,6 +22,11 @@ define $(PKG)_BUILD
         -DCMAKE_BUILD_TYPE=Release \
         -DLIBUSB_INCLUDE_DIR=$(PREFIX)/$(TARGET)/include/libusb-1.0
     $(MAKE) -C '$(1)' -j '$(JOBS)' install VERBOSE=1
+
+    '$(TARGET)-gcc' \
+        -W -Wall -Wextra -Werror \
+        '$(2).c' -o '$(PREFIX)/$(TARGET)/bin/test-libftdi1.exe' \
+        `'$(TARGET)-pkg-config' libftdi1 --cflags --libs`
 endef
 
 $(PKG)_BUILD_SHARED =