Port VSG_SUPPORTS_ShaderCompiler to option

Author: dg0yt

CMakeLists.txt

@@ -41,7 +41,7 @@ find_package(Threads REQUIRED)
 set(VSG_MAX_INSTRUMENTATION_LEVEL 1 CACHE STRING "Set the instrumentation level to build into the VSG library, 0 for off, 1 coarse grained, 2 medium, 3 fine grained." )
 
 # Enable/disable shader compilation support that pulls in glslang
-set(VSG_SUPPORTS_ShaderCompiler  1 CACHE STRING "Optional shader compiler support, 0 for off, 1 for enabled." )
+option(VSG_SUPPORTS_ShaderCompiler "Optional shader compiler support" ON)
 if (VSG_SUPPORTS_ShaderCompiler)
 
     # Try looking for glslang 15 first.

src/vsg/core/Version.h.in

@@ -37,7 +37,7 @@ extern "C"
     #define VSG_MAX_INSTRUMENTATION_LEVEL @VSG_MAX_INSTRUMENTATION_LEVEL@
 
     /// vsg::ShaderCompiler support enabled when 1, disabled when 0
-    #define VSG_SUPPORTS_ShaderCompiler @VSG_SUPPORTS_ShaderCompiler@
+    #cmakedefine01 VSG_SUPPORTS_ShaderCompiler
 
     /// vsg::ShaderCompiler optimizer support enabled when 1, disabled when 0
     #cmakedefine01 VSG_SUPPORTS_ShaderOptimizer