[OpenMP][cmake] Add SPARC support (#142364)

This patch adds SPARC infrastructure to the `openmp` `cmake` files,
matching what is done for other architectures.

Tested on `sparc-sun-solaris2.11`, `sparcv9-sun-solaris2.11`,
`sparc-unknown-linux-gnu`, `sparc64-unknown-linux-gnu`,
`i386-pc-solaris2.11`, `amd64-pc-solaris2.11`, `i686-pc-linux-gnu`, and
`x86_64-pc-linux-gnu`.

Author: rorth

openmp/runtime/CMakeLists.txt

@@ -190,6 +190,8 @@ set(VE FALSE)
 set(S390X FALSE)
 set(WASM FALSE)
 set(PPC FALSE)
+set(SPARC FALSE)
+set(SPARCV9 FALSE)
 if("${LIBOMP_ARCH}" STREQUAL "i386" OR "${LIBOMP_ARCH}" STREQUAL "32")    # IA-32 architecture
   set(IA32 TRUE)
 elseif("${LIBOMP_ARCH}" STREQUAL "x86_64" OR "${LIBOMP_ARCH}" STREQUAL "32e") # Intel(R) 64 architecture
@@ -226,6 +228,10 @@ elseif("${LIBOMP_ARCH}" STREQUAL "s390x") # S390x (Z) architecture
     set(S390X TRUE)
 elseif("${LIBOMP_ARCH}" STREQUAL "wasm32") # WebAssembly architecture
     set(WASM TRUE)
+elseif("${LIBOMP_ARCH}" STREQUAL "sparc") # SPARC architecture
+    set(SPARC TRUE)
+elseif("${LIBOMP_ARCH}" STREQUAL "sparcv9") # SPARC V9 architecture
+    set(SPARCV9 TRUE)
 endif()
 
 # Set some flags based on build_type

openmp/runtime/cmake/LibompUtils.cmake

@@ -117,6 +117,10 @@ function(libomp_get_legal_arch return_arch_string)
     set(${return_arch_string} "VE" PARENT_SCOPE)
   elseif(${S390X})
     set(${return_arch_string} "S390X" PARENT_SCOPE)
+  elseif(${SPARC})
+    set(${return_arch_string} "SPARC" PARENT_SCOPE)
+  elseif(${SPARCV9})
+    set(${return_arch_string} "SPARCV9" PARENT_SCOPE)
   else()
     set(${return_arch_string} "${LIBOMP_ARCH}" PARENT_SCOPE)
     libomp_warning_say("libomp_get_legal_arch(): Warning: Unknown architecture: Using ${LIBOMP_ARCH}")