Merge pull request #21 from daipingh/cmake_3_15

Update CMakeLists.txt to allow building with CMake 3.15

Author: dprokoptsev

.github/workflows/ci.yml

@@ -105,7 +105,7 @@ jobs:
               sudo env PYTHONUNBUFFERED=1 ./vsdownload.py --accept-license --dest /opt/msvc
               sudo ./install.sh /opt/msvc
 
-            cmake_flags: -DCMAKE_SYSTEM_NAME=Windows -DCMAKE_LINKER=link -DCMAKE_CXX_FLAGS_DEBUG="/MT /Zi /Ob0 /Od /RTC1" -DCMAKE_MSVC_DEBUG_INFORMATION_FORMAT=Embedded
+            cmake_flags: -DCMAKE_SYSTEM_NAME=Windows -DCMAKE_LINKER=link -DCMAKE_MSVC_RUNTIME_LIBRARY=MultiThreaded -DCMAKE_MSVC_DEBUG_INFORMATION_FORMAT=Embedded
             env: PATH=/opt/msvc/bin/x64:$PATH
             cc: cl
             cxx: cl

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.0)
+cmake_minimum_required(VERSION 3.15)
 project(corral)
 
 set(CMAKE_CXX_STANDARD 20)
@@ -8,6 +8,9 @@ set(CMAKE_CXX_EXTENSIONS OFF)
 add_library(
   corral
   INTERFACE
+)
+target_sources(corral
+  INTERFACE
   corral/asio.h
   corral/CBPortal.h
   corral/Channel.h