From 2af7e40ce698eab25ac44cd492e7546e1010f16a Mon Sep 17 00:00:00 2001
From: Jan Beich <jbeich@FreeBSD.org>
Date: Tue, 7 Jul 2020 10:13:15 +0000
Subject: [PATCH] cmake: unbreak system libusb support
Reference libusb doesn't support DragonFly and FreeBSD because those
ship a different libusb implementation (supports 0.1, 1.0, 2.0 API).
ld: error: undefined symbol: usbi_backend
>>> referenced by core.c
>>> core.c.o:(usbi_alloc_device) in archive externals/libusb/libusb.a
ld: error: undefined symbol: usbi_backend
>>> referenced by core.c
>>> core.c.o:(usbi_alloc_device) in archive externals/libusb/libusb.a
ld: error: undefined symbol: usbi_backend
>>> referenced by core.c
>>> core.c.o:(libusb_has_capability) in archive externals/libusb/libusb.a
ld: error: undefined symbol: usbi_backend
>>> referenced by core.c
>>> core.c.o:(libusb_has_capability) in archive externals/libusb/libusb.a
ld: error: undefined symbol: usbi_backend
>>> referenced by core.c
>>> core.c.o:(libusb_has_capability) in archive externals/libusb/libusb.a
ld: error: undefined symbol: usbi_backend
>>> referenced by core.c
>>> core.c.o:(usbi_connect_device) in archive externals/libusb/libusb.a
ld: error: undefined symbol: usbi_backend
>>> referenced by core.c
>>> core.c.o:(usbi_disconnect_device) in archive externals/libusb/libusb.a
ld: error: undefined symbol: usbi_backend
>>> referenced by core.c
>>> core.c.o:(libusb_get_device_list) in archive externals/libusb/libusb.a
ld: error: undefined symbol: usbi_backend
>>> referenced by core.c
>>> core.c.o:(libusb_get_device_list) in archive externals/libusb/libusb.a
ld: error: undefined symbol: usbi_backend
>>> referenced by core.c
>>> core.c.o:(libusb_unref_device) in archive externals/libusb/libusb.a
ld: error: undefined symbol: usbi_backend
>>> referenced by core.c
>>> core.c.o:(libusb_unref_device) in archive externals/libusb/libusb.a
ld: error: undefined symbol: usbi_write
>>> referenced by core.c
>>> core.c.o:(usbi_signal_event) in archive externals/libusb/libusb.a
ld: error: undefined symbol: usbi_read
>>> referenced by core.c
>>> core.c.o:(usbi_clear_event) in archive externals/libusb/libusb.a
ld: error: undefined symbol: usbi_backend
>>> referenced by core.c
>>> core.c.o:(libusb_wrap_sys_device) in archive externals/libusb/libusb.a
ld: error: undefined symbol: usbi_backend
>>> referenced by core.c
>>> core.c.o:(libusb_wrap_sys_device) in archive externals/libusb/libusb.a
ld: error: undefined symbol: usbi_backend
>>> referenced by core.c
>>> core.c.o:(libusb_wrap_sys_device) in archive externals/libusb/libusb.a
ld: error: undefined symbol: usbi_backend
>>> referenced by core.c
>>> core.c.o:(libusb_open) in archive externals/libusb/libusb.a
ld: error: undefined symbol: usbi_backend
>>> referenced by core.c
>>> core.c.o:(libusb_open) in archive externals/libusb/libusb.a
ld: error: undefined symbol: usbi_read
>>> referenced by core.c
>>> core.c.o:(libusb_close) in archive externals/libusb/libusb.a
ld: error: undefined symbol: usbi_write
>>> referenced by core.c
>>> core.c.o:(libusb_close) in archive externals/libusb/libusb.a
ld: error: too many errors emitted, stopping now (use -error-limit=0 to see all errors)
c++: error: linker command failed with exit code 1 (use -v to see invocation)
---
CMakeLists.txt | 6 ++--
externals/find-modules/FindLibUSB.cmake | 43 +++++++++++++++++++++++++
2 files changed, 47 insertions(+), 2 deletions(-)
create mode 100644 externals/find-modules/FindLibUSB.cmake
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 27383bce8..cd40e5cfe 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -331,8 +331,10 @@ endif()
# Ensure libusb is properly configured (based on dolphin libusb include)
find_package(LibUSB)
-add_subdirectory(externals/libusb)
-set(LIBUSB_LIBRARIES usb)
+if (NOT LIBUSB_FOUND)
+ add_subdirectory(externals/libusb)
+ set(LIBUSB_LIBRARIES usb)
+endif()
# Prefer the -pthread flag on Linux.
diff --git a/externals/find-modules/FindLibUSB.cmake b/externals/find-modules/FindLibUSB.cmake
new file mode 100644
index 000000000..dec0b98b0
--- /dev/null
+++ b/externals/find-modules/FindLibUSB.cmake
@@ -0,0 +1,43 @@
+# - Find libusb-1.0 library
+# This module defines
+# LIBUSB_INCLUDE_DIR, where to find bluetooth.h
+# LIBUSB_LIBRARIES, the libraries needed to use libusb-1.0.
+# LIBUSB_FOUND, If false, do not try to use libusb-1.0.
+#
+# Copyright (c) 2009, Michal Cihar, <michal@cihar.com>
+#
+# vim: expandtab sw=4 ts=4 sts=4:
+
+if(ANDROID)
+ set(LIBUSB_FOUND FALSE CACHE INTERNAL "libusb-1.0 found")
+ message(STATUS "libusb-1.0 not found.")
+elseif (NOT LIBUSB_FOUND)
+ pkg_check_modules (LIBUSB_PKG libusb-1.0)
+
+ find_path(LIBUSB_INCLUDE_DIR NAMES libusb.h
+ PATHS
+ ${LIBUSB_PKG_INCLUDE_DIRS}
+ /usr/include/libusb-1.0
+ /usr/include
+ /usr/local/include/libusb-1.0
+ /usr/local/include
+ )
+
+ find_library(LIBUSB_LIBRARIES NAMES usb-1.0 usb
+ PATHS
+ ${LIBUSB_PKG_LIBRARY_DIRS}
+ /usr/lib
+ /usr/local/lib
+ )
+
+ if(LIBUSB_INCLUDE_DIR AND LIBUSB_LIBRARIES)
+ set(LIBUSB_FOUND TRUE CACHE INTERNAL "libusb-1.0 found")
+ message(STATUS "Found libusb-1.0: ${LIBUSB_INCLUDE_DIR}, ${LIBUSB_LIBRARIES}")
+ else(LIBUSB_INCLUDE_DIR AND LIBUSB_LIBRARIES)
+ set(LIBUSB_FOUND FALSE CACHE INTERNAL "libusb-1.0 found")
+ message(STATUS "libusb-1.0 not found.")
+ endif(LIBUSB_INCLUDE_DIR AND LIBUSB_LIBRARIES)
+
+ mark_as_advanced(LIBUSB_INCLUDE_DIR LIBUSB_LIBRARIES)
+endif ()
+