add LLVM_ENABLE_ICU and LLVM_ENABLE_ICONV option

Author: abhina-sree

llvm/CMakeLists.txt

@@ -534,6 +534,10 @@ else()
   option(LLVM_ENABLE_THREADS "Use threads if available." ON)
 endif()
 
+set(LLVM_ENABLE_ICU "ON" CACHE STRING "Use ICU for character conversion support if available. Can be ON, OFF, or FORCE_ON")
+
+set(LLVM_ENABLE_ICONV "ON" CACHE STRING "Use iconv for character conversion support if available. Can be ON, OFF, or FORCE_ON")
+
 set(LLVM_ENABLE_ZLIB "ON" CACHE STRING "Use zlib for compression/decompression if available. Can be ON, OFF, or FORCE_ON")
 
 set(LLVM_ENABLE_ZSTD "ON" CACHE STRING "Use zstd for compression/decompression if available. Can be ON, OFF, or FORCE_ON")

llvm/cmake/config-ix.cmake

@@ -258,19 +258,23 @@ else()
 endif()
 
 #Check for icu.
-find_package(ICU COMPONENTS uc i18n)
-if(ICU_FOUND)
-  set(HAVE_ICU 1)
-else()
-  set(HAVE_ICU 0)
+if(LLVM_ENABLE_ICU)
+  find_package(ICU COMPONENTS uc i18n)
+  if(ICU_FOUND)
+    set(HAVE_ICU 1)
+  else()
+    set(HAVE_ICU 0)
+  endif()
 endif()
 
 # Check for iconv.
-find_package(Iconv)
-if(Iconv_FOUND)
-  set(HAVE_ICONV 1)
-else()
-  set(HAVE_ICONV 0)
+if(LLVM_ENABLE_ICONV)
+  find_package(Iconv)
+  if(Iconv_FOUND)
+    set(HAVE_ICONV 1)
+  else()
+    set(HAVE_ICONV 0)
+  endif()
 endif()
 
 # function checks