From 2b8c9f9a17926ce0eace44ada299e6ecb6f12cd1 Mon Sep 17 00:00:00 2001
From: Ahmad Fatoum <ahmad@a3f.at>
Date: Mon, 23 Jul 2018 20:42:19 +0200
Subject: CMake: Fail when -D{PLATFORM,OPENGL_VERSION}=INVALID_VALUE

as well as -DUSE_EXTERNAL_GLFW.

Nips issues like #584 in the bud.
---
 cmake/EnumOption.cmake | 9 +++++++++
 1 file changed, 9 insertions(+)
 create mode 100644 cmake/EnumOption.cmake

(limited to 'cmake')

diff --git a/cmake/EnumOption.cmake b/cmake/EnumOption.cmake
new file mode 100644
index 00000000..d7d343f4
--- /dev/null
+++ b/cmake/EnumOption.cmake
@@ -0,0 +1,9 @@
+macro(enum_option var values description)
+  set(${var}_VALUES ${values})
+  list(GET ${var}_VALUES 0 default)
+  set(${var} "${default}" CACHE STRING "${description}")
+  set_property(CACHE ${var} PROPERTY STRINGS ${${var}_VALUES})
+  if (NOT ";${${var}_VALUES};" MATCHES ";${${var}};")
+    message(FATAL_ERROR "Unknown value ${${var}}. Only -D${var}=${${var}_VALUES} allowed.")
+  endif()
+endmacro()
-- 
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