hosted: Allow to build without libusb, libftdi and hidapi with HOSTED_BMP_ONLY=1

src/platforms/hosted/Makefile.inc

@@ -2,6 +2,14 @@ SYS = $(shell $(CC) -dumpmachine)
 CFLAGS += -DENABLE_DEBUG -DPLATFORM_HAS_DEBUG
 CFLAGS +=-I ./target -I./platforms/pc
 
+# Define HOSTED_BMP_ONLY to '1' in order to build the hosted blackmagic
+# executable with support for native BMP probes only. This makes
+# linking against the libftdi and libusb libraries unnecessary. This can
+# be useful to minimize external dependencies, and make building on
+# windows systems easier.
+HOSTED_BMP_ONLY ?= 0
+CFLAGS  +=  -DHOSTED_BMP_ONLY=$(HOSTED_BMP_ONLY)
+
 ifneq (, $(findstring linux, $(SYS)))
 SRC += serial_unix.c
 ifeq ($(ASAN), 1)
@@ -24,27 +32,32 @@ LDFLAGS += -framework CoreFoundation
 CFLAGS += -Ihidapi/hidapi
 endif
 
+ifneq ($(HOSTED_BMP_ONLY), 1)
 LDFLAGS += -lusb-1.0
 CFLAGS += $(shell pkg-config --cflags libftdi1)
 LDFLAGS += $(shell pkg-config --libs libftdi1)
 CFLAGS += -Wno-missing-field-initializers
+endif
 
-ifneq (, $(findstring mingw, $(SYS)))
+ifneq ($(HOSTED_BMP_ONLY), 1)
- SRC += cmsis_dap.c dap.c hid.c
- CFLAGS  +=  -DCMSIS_DAP
-else
- ifeq ($(shell pkg-config --exists hidapi-libusb && echo 0), 0)
-  CFLAGS += $(shell pkg-config --cflags hidapi-libusb)
-  LDFLAGS += $(shell pkg-config --libs hidapi-libusb)
  CFLAGS  +=  -DCMSIS_DAP
  SRC += cmsis_dap.c dap.c
+ ifneq (, $(findstring mingw, $(SYS)))
+  SRC += hid.c
+ else
+  CFLAGS += $(shell pkg-config --cflags hidapi-libusb)
+  LDFLAGS += $(shell pkg-config --libs hidapi-libusb)
  endif
 endif
 
 VPATH += platforms/pc
 SRC += timing.c cl_utils.c utils.c
-SRC += stlinkv2.c bmp_libusb.c
 SRC += bmp_remote.c remote_swdptap.c remote_jtagtap.c
+ifneq ($(HOSTED_BMP_ONLY), 1)
+SRC += bmp_libusb.c stlinkv2.c
 SRC += ftdi_bmp.c libftdi_swdptap.c libftdi_jtagtap.c
 SRC += jlink.c jlink_adiv5_swdp.c jlink_jtagtap.c
+else
+SRC += bmp_serial.c
+endif
 PC_HOSTED = 1

src/platforms/hosted/bmp_libusb.c

@@ -22,6 +22,7 @@
 #include "libusb-1.0/libusb.h"
 #include "cl_utils.h"
 #include "ftdi_bmp.h"
+#include "version.h"
 
 #define VENDOR_ID_STLINK         0x0483
 #define PRODUCT_ID_STLINK_MASK   0xffe0
@@ -35,6 +36,17 @@
 
 #define VENDOR_ID_SEGGER         0x1366
 
+void bmp_ident(bmp_info_t *info)
+{
+	DEBUG_INFO("BMP hosted %s\n for ST-Link V2/3, CMSIS_DAP, JLINK and "
+			   "LIBFTDI/MPSSE\n", FIRMWARE_VERSION);
+	if (info && info->vid && info->pid)
+		DEBUG_INFO("Using %04x:%04x %s %s\n %s\n", info->vid, info->pid,
+				   info->serial,
+				   info->manufacturer,
+				   info->product);
+}
+
 void libusb_exit_function(bmp_info_t *info)
 {
 	if (!info->usb_link)

src/platforms/hosted/bmp_serial.c

@@ -0,0 +1,40 @@
+/*
+ * This file is part of the Black Magic Debug project.
+ *
+ * Copyright (C) 2020 Uwe Bonnes (bon@elektron.ikp.physik.tu-darmstadt.de)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Find all known serial connected debuggers */
+
+#include "general.h"
+#include <stdint.h>
+#include "platform.h"
+#include "bmp_hosted.h"
+#include "version.h"
+
+void bmp_ident(bmp_info_t *info)
+{
+	(void) info;
+	DEBUG_INFO("BMP hosted %s\n", FIRMWARE_VERSION);
+}
+
+void libusb_exit_function(bmp_info_t *info) {(void)info;};
+int find_debuggers(BMP_CL_OPTIONS_t *cl_opts, bmp_info_t *info)
+{
+	(void)cl_opts;
+	(void)info;
+	return -1;
+};

src/platforms/hosted/platform.c

@@ -85,11 +85,7 @@ void platform_init(int argc, char **argv)
 	} else if (find_debuggers(&cl_opts, &info)) {
 		exit(-1);
 	}
-	DEBUG_INFO("BMP hosted %s\n for ST-Link V2/3, CMSIS_DAP, JLINK and "
+	bmp_ident(&info);
-			   "LIBFTDI/MPSSE\n", FIRMWARE_VERSION);
-	DEBUG_INFO("Using %04x:%04x %s %s\n %s\n", info.vid, info.pid, info.serial,
-		   info.manufacturer,
-		   info.product);
 	switch (info.bmp_type) {
 	case BMP_TYPE_BMP:
 		if (serial_open(&cl_opts, info.serial))