Merge pull request #12910 from fwcd/better-no-env-errors

CMakeLists: Emit better errors for exotic target platforms

CMakeLists.txt

@@ -54,14 +54,18 @@ function(FATAL_ERROR_MISSING_ENV)
     else()
       message(FATAL_ERROR "Did you download the Mixxx build environment using `${CMAKE_SOURCE_DIR}/tools/windows_release_buildenv.bat` or `${CMAKE_SOURCE_DIR}/tools/windows_buildenv.bat`(includes Debug)?")
     endif()
-  elseif(APPLE)
+  elseif(APPLE AND NOT IOS)
     if(CMAKE_BUILD_TYPE MATCHES "Debug")
       message(FATAL_ERROR "Did you download the Mixxx build environment using `${CMAKE_SOURCE_DIR}/tools/macos_buildenv.sh`")
     else()
       message(FATAL_ERROR "Did you download the Mixxx build environment using `${CMAKE_SOURCE_DIR}/tools/macos_release_buildenv.sh` or `${CMAKE_SOURCE_DIR}/tools/macos_buildenv.sh`(includes Debug)?")
     endif()
-  else()
+  elseif(LINUX)
     message(FATAL_ERROR "Did you install the Debian dev packages via `${CMAKE_SOURCE_DIR}/tools/debian_buildenv.sh` or the equivalent packages using your package manager?")
+  elseif(DEFINED VCPKG_TARGET_TRIPLET)
+    message(FATAL_ERROR "You are targeting ${VCPKG_TARGET_TRIPLET}, which does not have a prebuilt environment. Please make sure that -DMIXXX_VCPKG_ROOT points to a vcpkg environment containing installed dependencies for ${VCPKG_TARGET_TRIPLET}!")
+  else()
+    message(FATAL_ERROR "You are building for an unknown platform and are missing a build environment. Please set -DVCPKG_TARGET_TRIPLET and make sure that -DMIXXX_VCPKG_ROOT points to a vcpkg environment containing installed dependencies for your target platform!")
   endif()
 endfunction()