MSYS2 / MinGW support (#61)

README.md

@@ -29,6 +29,20 @@ cd build
 cmake -G "NMake Makefiles" ..
 nmake
 ```
+
+Windows with MinGW in MSYS2:
+
+No need to download libusb separately or set LIBUSB_ROOT.
+
+```console
+pacman -S $MINGW_PACKAGE_PREFIX-{toolchain,cmake,libusb}
+mkdir build
+cd build
+MSYS2_ARG_CONV_EXCL=- cmake .. -G"MSYS Makefiles" -DCMAKE_INSTALL_PREFIX=$MINGW_PREFIX
+make
+make install DESTDIR=/  # optional
+```
+
 ## Overview
 
 `picotool` is a tool for inspecting RP2040 binaries, and interacting with RP2040 devices when they are in BOOTSEL mode. (As of version 1.1 of `picotool` it is also possible to interact with RP2040 devices that are not in BOOTSEL mode, but are using USB stdio support from the Raspberry Pi Pico SDK by using the `-f` argument of `picotool`).

cmake/FindLIBUSB.cmake

@@ -12,12 +12,12 @@ if (LIBUSB_INCLUDE_DIR AND LIBUSB_LIBRARIES)
     # in cache already
     set(LIBUSB_FOUND TRUE)
 else (LIBUSB_INCLUDE_DIR AND LIBUSB_LIBRARIES)
-    IF (NOT WIN32)
+    IF (NOT MSVC)
         # use pkg-config to get the directories and then use these values
         # in the FIND_PATH() and FIND_LIBRARY() calls
         find_package(PkgConfig)
         pkg_check_modules(PC_LIBUSB libusb-1.0)
-    ENDIF(NOT WIN32)
+    ENDIF ()
     FIND_PATH(LIBUSB_INCLUDE_DIR libusb.h
             HINTS $ENV{LIBUSB_ROOT}/include/libusb-1.0
             PATHS ${PC_LIBUSB_INCLUDEDIR} ${PC_LIBUSB_INCLUDE_DIRS})

main.cpp

@@ -4,7 +4,7 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifdef _MSC_VER
+#ifdef _WIN32
 #define _CRT_SECURE_NO_WARNINGS
 #endif
 
@@ -37,7 +37,7 @@
 #endif
 
 // tsk namespace is polluted on windows
-#ifdef _MSC_VER
+#ifdef _WIN32
 #undef min
 #undef max
 
@@ -2043,7 +2043,7 @@ static int reboot_device(libusb_device *device, bool bootsel, uint disable_mask=
     libusb_device_handle *dev_handle;
     ret = libusb_open(device, &dev_handle);
     if (ret) {
-#if _MSC_VER
+#if _WIN32
         fail(ERROR_USB, "Unable to access device to reboot it; Make sure there is a driver installed via Zadig\n", ret);
 #else
         fail(ERROR_USB, "Unable to access device to reboot it; Use sudo or setup a udev rule\n", ret);