[libclc] Use VERSION_GREATER_EQUAL where appropriate. NFC

This was added in CMake 3.7, which might explain why it wasn't used
before.

Also reformat a couple of comments.

Author: frasercrmck

libclc/CMakeLists.txt

@@ -20,7 +20,7 @@ set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS
   spirv64/lib/SOURCES
 )
 
-set( LIBCLC_MIN_LLVM "3.9.0" )
+set( LIBCLC_MIN_LLVM 3.9.0 )
 
 set( LIBCLC_TARGETS_TO_BUILD "all"
     CACHE STRING "Semicolon-separated list of targets to build, or 'all'." )
@@ -32,7 +32,7 @@ include(AddLLVM)
 
 message( STATUS "libclc LLVM version: ${LLVM_PACKAGE_VERSION}" )
 
-if( ${LLVM_PACKAGE_VERSION} VERSION_LESS ${LIBCLC_MIN_LLVM} )
+if( LLVM_PACKAGE_VERSION VERSION_LESS LIBCLC_MIN_LLVM )
   message( FATAL_ERROR "libclc needs at least LLVM ${LIBCLC_MIN_LLVM}" )
 endif()
 
@@ -66,7 +66,7 @@ set( LIBCLC_TARGETS_ALL
 )
 
 # mesa3d environment is only available since LLVM 4.0
-if( ${LLVM_PACKAGE_VERSION} VERSION_GREATER "3.9.0" )
+if( LLVM_PACKAGE_VERSION VERSION_GREATER_EQUAL 4.0.0 )
   list( APPEND LIBCLC_TARGETS_ALL amdgcn-mesa-mesa3d )
 endif()
 
@@ -102,7 +102,7 @@ set( LLVM_VERSION_DEFINE "-DHAVE_LLVM=0x${LLVM_VERSION_MAJOR}0${LLVM_VERSION_MIN
 
 
 # LLVM 13 enables standard includes by default
-if( ${LLVM_PACKAGE_VERSION} VERSION_GREATER "12.99.99" )
+if( LLVM_PACKAGE_VERSION VERSION_GREATER_EQUAL 13.0.0 )
   set( CMAKE_LLAsm_FLAGS "${CMAKE_LLAsm_FLAGS} -cl-no-stdinc" )
   set( CMAKE_CLC_FLAGS "${CMAKE_CLC_FLAGS} -cl-no-stdinc" )
 endif()
@@ -205,7 +205,7 @@ foreach( t ${LIBCLC_TARGETS_TO_BUILD} )
     list( APPEND dirs amdgpu )
   endif()
 
-  #nvptx is special
+  # nvptx is special
   if( ${ARCH} STREQUAL nvptx OR ${ARCH} STREQUAL nvptx64 )
     set( DARCH ptx )
   else()
@@ -226,8 +226,8 @@ foreach( t ${LIBCLC_TARGETS_TO_BUILD} )
     endforeach()
   endforeach()
 
-  # Add the generated convert.cl here to prevent adding
-  # the one listed in SOURCES
+  # Add the generated convert.cl here to prevent adding the one listed in
+  # SOURCES
   if( NOT ${ARCH} STREQUAL "spirv" AND NOT ${ARCH} STREQUAL "spirv64" )
     if( NOT ENABLE_RUNTIME_SUBNORMAL AND NOT ${ARCH} STREQUAL "clspv" AND
         NOT ${ARCH} STREQUAL "clspv64" )