[libclc] [libclc] Set OpenCL C version for each target (PR #135733)

[Fraser Cormack via cfe-commits]

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@@ -387,21 +387,39 @@ foreach( t ${LIBCLC_TARGETS_TO_BUILD} )
 
     message( STATUS "  device: ${d} ( ${${d}_aliases} )" )
 
-    if ( ARCH STREQUAL spirv OR ARCH STREQUAL spirv64 )
+    # 1.2 is Clang's default OpenCL C language standard to compile for.
+    set( opencl_lang_std "CL1.2" )
+
+    if ( ${DARCH} STREQUAL spirv )
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frasercrmck wrote:

I'd prefer `if( DARCH STREQUAL spirv )` which better fits the current style.

https://github.com/llvm/llvm-project/pull/135733