use older cmake for non-windows (#405)

* use older cmake for non-windows

* filter CI

.circleci/config.yml

@@ -82,3 +82,4 @@ workflows:
             branches:
               ignore:
                 - release
+                - deployment

.github/workflows/linux_ci.yml

@@ -2,6 +2,8 @@ name: Linux CI
 
 on:
   push:
+    branches:
+      - master
   pull_request:
 
 jobs:

.github/workflows/mac_ci.yml

@@ -2,6 +2,8 @@ name: Mac CI
 
 on:
   push:
+    branches:
+      - master
   pull_request:
 
 jobs:

.github/workflows/vcpkg_build.yml

@@ -1,6 +1,8 @@
 name: Vcpkg Build
 on:
   push:
+    branches:
+      - master
   pull_request:
 
 jobs:

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.15.0)
+cmake_minimum_required(VERSION 3.0.2)
 
 set(EXTERNAL_DIR "${CMAKE_SOURCE_DIR}/external")
 
@@ -63,7 +63,17 @@ else()
   endif()
 endif()
 
-project(EternalTCP VERSION 6.1.1)
+# Don't specify languages yet in case we need to bump the cmake version
+project(EternalTCP VERSION 6.1.1 LANGUAGES NONE)
+
+if(WIN32)
+message(STATUS "Windows detected.  Bumping up cmake version.")
+# Hack to force a higher minimum version on windows
+cmake_minimum_required(VERSION 3.15.0)
+endif()
+
+enable_language(C)
+enable_language(CXX)
 
 include(CMakeFindDependencyMacro)