Build ICU library from sources.

.gitmodules

@@ -122,3 +122,9 @@
 [submodule "contrib/curl"]
 	path = contrib/curl
 	url = https://github.com/curl/curl.git
+[submodule "contrib/icudata"]
+	path = contrib/icudata
+	url = https://github.com/ClickHouse-Extras/icudata.git
+[submodule "contrib/icu"]
+	path = contrib/icu
+	url = https://github.com/unicode-org/icu.git

cmake/find/icu.cmake

@@ -1,6 +1,18 @@
 option(ENABLE_ICU "Enable ICU" ${ENABLE_LIBRARIES})
 
-if(ENABLE_ICU)
+if (ENABLE_ICU)
+
+option (USE_INTERNAL_ICU_LIBRARY "Set to FALSE to use system ICU library instead of bundled" ${NOT_UNBUNDLED})
+
+if (NOT EXISTS "${ClickHouse_SOURCE_DIR}/contrib/icu/icu4c/LICENSE")
+    if (USE_INTERNAL_ICU_LIBRARY)
+        message (WARNING "submodule contrib/icu is missing. to fix try run: \n git submodule update --init --recursive")
+        set (USE_INTERNAL_ICU_LIBRARY 0)
+    endif ()
+    set (MISSING_INTERNAL_ICU_LIBRARY 1)
+endif ()
+
+if(NOT USE_INTERNAL_ICU_LIBRARY)
     if (APPLE)
         set(ICU_ROOT "/usr/local/opt/icu4c" CACHE STRING "")
     endif()
@@ -11,6 +23,16 @@ if(ENABLE_ICU)
     endif()
 endif()
 
+if (ICU_LIBRARY AND ICU_INCLUDE_DIR)
+    set (USE_ICU 1)
+elseif (NOT MISSING_INTERNAL_ICU_LIBRARY)
+    set (USE_INTERNAL_ICU_LIBRARY 1)
+    set (ICU_LIBRARIES icui18n icuuc icudata)
+    set (USE_ICU 1)
+endif ()
+
+endif()
+
 if(USE_ICU)
     message(STATUS "Using icu=${USE_ICU}: ${ICU_INCLUDE_DIR} : ${ICU_LIBRARIES}")
 else()

contrib/CMakeLists.txt

@@ -165,6 +165,10 @@ if (ENABLE_ODBC AND USE_INTERNAL_ODBC_LIBRARY)
     add_library(ODBC::ODBC ALIAS ${ODBC_LIBRARIES})
 endif ()
 
+if (ENABLE_ICU AND USE_INTERNAL_ICU_LIBRARY)
+    add_subdirectory (icu-cmake)
+endif ()
+
 if (USE_INTERNAL_PARQUET_LIBRARY)
 if (USE_INTERNAL_PARQUET_LIBRARY_NATIVE_CMAKE)
     # We dont use arrow's cmakefiles because they uses too many depends and download some libs in compile time