uhd: enable vcpkg support on windows

vcpkg can be used for the Windows C++ dependencies for uhd with this commit.

To use vcpkg on Windows:
1) Copy the custom triplets in host/cmake/vcpkg/ to the vcpkg/triplets/ folder.
2) Install boost and libusb for the custom triplet

"vcpkg install libusb:uhd-x64-windows-static-md boost:uhd-x64-windows-static-md"

3) Call CMake with vcpkg toolchain file flags:
-DVCPKG_TARGET_TRIPLET=uhd-x64-windows-static-md
-DCMAKE_TOOLCHAIN_FILE=%VCPKG_INSTALL_DIR%/scripts/buildsystems/vcpkg.cmake
-G "Visual Studio 16 2019" -A x64

Replace the -G with the installed version of Visual Studio and matching
architecture. Then build normally by running vcvarsall.bat and msbuild.

Signed-off-by: Steven Koo <steven.koo@ni.com>

host/cmake/Modules/UHDBoost.cmake

@@ -118,12 +118,26 @@ endif(UNIX AND NOT BOOST_ROOT AND EXISTS "/usr/lib64")
 
 # special Microsoft Visual C handling
 if(MSVC)
-    set(BOOST_ALL_DYN_LINK "${BOOST_ALL_DYN_LINK}" CACHE BOOL "boost enable dynamic linking")
-    if(BOOST_ALL_DYN_LINK)
-        add_definitions(-DBOOST_ALL_DYN_LINK) #setup boost auto-linking in msvc
-    else(BOOST_ALL_DYN_LINK)
-        set(UHD_BOOST_REQUIRED_COMPONENTS) #empty components list for static link
-    endif(BOOST_ALL_DYN_LINK)
+    if(VCPKG_TARGET_TRIPLET)
+        message(STATUS "  VCPKG Libs")
+        string(FIND ${VCPKG_TARGET_TRIPLET} "static" vcpkg_check_static)
+        string(FIND ${VCPKG_TARGET_TRIPLET} "static-md" vcpkg_check_static_md)
+        if((NOT vcpkg_check_static EQUAL -1) AND vcpkg_check_static_md EQUAL -1)
+            # Statically linked CRT
+            message(STATUS "  VCPKG static CRT triplet found. Configuring compiler flags.")
+            set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /MT")
+            set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /MTd")
+        endif((NOT vcpkg_check_static EQUAL -1) AND vcpkg_check_static_md EQUAL -1)
+    else(VCPKG_TARGET_TRIPLET)
+        set(BOOST_ALL_DYN_LINK "${BOOST_ALL_DYN_LINK}" CACHE BOOL "boost enable dynamic linking")
+        if(BOOST_ALL_DYN_LINK)
+            message(STATUS "  Dynamic Libs")
+            add_definitions(-DBOOST_ALL_DYN_LINK) #setup boost auto-linking in msvc
+        else(BOOST_ALL_DYN_LINK)
+            message(STATUS "  Static Libs")
+            set(UHD_BOOST_REQUIRED_COMPONENTS) #empty components list for static link
+        endif(BOOST_ALL_DYN_LINK)
+    endif(VCPKG_TARGET_TRIPLET)
 endif(MSVC)
 
 # Starting in CMake 3.15.0, if policy 'CMP0093' is available and set

host/cmake/vcpkg/uhd-x64-windows-static-md.cmake

@@ -0,0 +1,14 @@
+set(VCPKG_TARGET_ARCHITECTURE x64)
+set(VCPKG_CRT_LINKAGE dynamic)
+set(VCPKG_LIBRARY_LINKAGE static)
+# uhd dynamic links for boost-test and libusb.
+# The other boost dependencies are static.
+# This maintains historical compatibility
+# with previous binaries.
+if (PORT STREQUAL boost-test)
+    set(VCPKG_LIBRARY_LINKAGE dynamic)
+endif()
+
+if (PORT STREQUAL libusb)
+    set(VCPKG_LIBRARY_LINKAGE dynamic)
+endif()

host/cmake/vcpkg/uhd-x86-windows-static-md.cmake

@@ -0,0 +1,14 @@
+set(VCPKG_TARGET_ARCHITECTURE x86)
+set(VCPKG_CRT_LINKAGE dynamic)
+set(VCPKG_LIBRARY_LINKAGE static)
+# uhd dynamic links for boost-test and libusb.
+# The other boost dependencies are static.
+# This maintains historical compatibility
+# with previous binaries.
+if (PORT STREQUAL boost-test)
+    set(VCPKG_LIBRARY_LINKAGE dynamic)
+endif()
+
+if (PORT STREQUAL libusb)
+    set(VCPKG_LIBRARY_LINKAGE dynamic)
+endif()

host/include/uhd/config.h

@@ -12,8 +12,11 @@
 #include <iso646.h>
 
 // Define ssize_t
-#include <stddef.h>
-typedef ptrdiff_t ssize_t;
+#ifndef _SSIZE_T_DEFINED
+#define _SSIZE_T_DEFINED
+# include <BaseTsd.h>
+typedef SSIZE_T ssize_t;
+#endif /* _SSIZE_T_DEFINED */
 
 #endif /* _MSC_VER */
 

host/include/uhd/config.hpp

@@ -38,8 +38,11 @@
 #    include <ciso646>
 
 // define ssize_t
-#    include <cstddef>
-typedef ptrdiff_t ssize_t;
+#ifndef _SSIZE_T_DEFINED
+#define _SSIZE_T_DEFINED
+#    include <BaseTsd.h>
+typedef SSIZE_T ssize_t;
+#endif /* _SSIZE_T_DEFINED */
 
 #endif // BOOST_MSVC
 

host/utils/CMakeLists.txt

@@ -53,6 +53,7 @@ set(util_share_sources_py
     uhd_power_cal.py
 )
 if(ENABLE_USB)
+    find_package(LIBUSB)
     list(APPEND util_share_sources
         fx2_init_eeprom.cpp
     )