libclc: Set CMAKE_CXX_STANDARD to 17 to match llvm

Reviewed By: thieta

Differential Revision: https://reviews.llvm.org/D142720

GitOrigin-RevId: 409f42b10ac6dc1c6a4e68d20ccd3adf6770e238
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0a23471..0e21a86 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,6 +2,8 @@
 
 project( libclc VERSION 0.2.0 LANGUAGES CXX C)
 
+set(CMAKE_CXX_STANDARD 17)
+
 include( GNUInstallDirs )
 set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS
   amdgcn-amdhsa/lib/SOURCES;