A conservatively refined FindICU

FindIDU.cmake

# Finds the International Components for Unicode (ICU) Library
#
#  ICU_FOUND          - True if ICU found.
#  ICU_I18N_FOUND     - True if ICU's internationalization library found.
#  ICU_INCLUDE_DIRS   - Directory to include to get ICU headers
#                       Note: always include ICU headers as, e.g.,
#                       unicode/utypes.h
#  ICU_LIBRARIES      - Libraries to link against for the common ICU
#  ICU_I18N_LIBRARIES - Libraries to link against for ICU internationaliation
#                       (note: in addition to ICU_LIBRARIES)

find_package(PkgConfig)
pkg_check_modules(PC_ICU icu-uc)

# Look for the header file.
find_path(
    ICU_INCLUDE_DIR
    NAMES unicode/utypes.h
    HINTS ${PC_ICU_INCLUDE_DIRS}
          ${PC_ICU_INCLUDEDIR}
          ${WEBKIT_LIBRARIES_INCLUDE_DIR}
    DOC "Include directory for the ICU library")
mark_as_advanced(ICU_INCLUDE_DIR)

# Look for the libraries (debug/release).
set(ICU_NAMES_RELEASE icuuc cygicuuc cygicuuc32 icuuc)
set(ICU_NAMES_DEBUG icuucd cygicuucd cygicuuc32d icuucd)

find_library(
    ICU_LIBRARY_RELEASE
    NAMES ${ICU_NAMES_RELEASE}
    HINTS ${PC_ICU_LIBRARY_DIRS}
          ${PC_ICU_LIBDIR}
          ${WEBKIT_LIBRARIES_LINK_DIR}
    DOC "Libraries to link against for the common parts of ICU (Release)")
mark_as_advanced(ICU_LIBRARY_RELEASE)

find_library(
    ICU_LIBRARY_DEBUG
    NAMES ${ICU_NAMES_DEBUG}
    HINTS ${PC_ICU_LIBRARY_DIRS}
          ${PC_ICU_LIBDIR}
          ${WEBKIT_LIBRARIES_LINK_DIR}
    DOC "Libraries to link against for the common parts of ICU (Debug)")
mark_as_advanced(ICU_LIBRARY_DEBUG)

if(ICU_LIBRARY_RELEASE AND ICU_LIBRARY_DEBUG)
    set(ICU_LIBRARY 
        debug ${ICU_LIBRARY_DEBUG}
        optimized ${ICU_LIBRARY_RELEASE}
        CACHE FILEPATH "Libraries to link against for the common parts of ICU")
else()
    set(ICU_LIBRARY ${ICU_LIBRARY_RELEASE} CACHE FILEPATH "Libraries to link against for the common parts of ICU")
endif()
mark_as_advanced(ICU_LIBRARY)
unset(ICU_NAMES_RELEASE)
unset(ICU_NAMES_DEBUG)

# Copy the results to the output variables.
if (ICU_INCLUDE_DIR AND ICU_LIBRARY)
    set(ICU_FOUND 1)
    set(ICU_LIBRARIES ${ICU_LIBRARY})
    set(ICU_INCLUDE_DIRS ${ICU_INCLUDE_DIR})

    set(ICU_VERSION 0)
    set(ICU_MAJOR_VERSION 0)
    set(ICU_MINOR_VERSION 0)
    file(READ "${ICU_INCLUDE_DIR}/unicode/uversion.h" _ICU_VERSION_CONENTS)
    string(REGEX REPLACE ".*#define U_ICU_VERSION_MAJOR_NUM ([0-9]+).*" "\\1" ICU_MAJOR_VERSION "${_ICU_VERSION_CONENTS}")
    string(REGEX REPLACE ".*#define U_ICU_VERSION_MINOR_NUM ([0-9]+).*" "\\1" ICU_MINOR_VERSION "${_ICU_VERSION_CONENTS}")

    set(ICU_VERSION "${ICU_MAJOR_VERSION}.${ICU_MINOR_VERSION}")

    # Look for the ICU internationalization libraries
    pkg_check_modules(PC_ICU_I18N icu-i18n)

    set(ICU_I18N_NAMES_RELEASE icui18n icuin cygicuin cygicuin32)
    set(ICU_I18N_NAMES_DEBUG icui18nd icuind cygicuind cygicuin32d)

    find_library(
        ICU_I18N_LIBRARY_RELEASE
        NAMES ${ICU_I18N_NAMES_RELEASE}
        HINTS ${PC_ICU_I18N_LIBRARY_DIRS}
              ${PC_ICU_I18N_LIBDIR}
              ${WEBKIT_LIBRARIES_LINK_DIR}
        DOC "Libraries to link against for ICU internationalization (Release)")
    mark_as_advanced(ICU_I18N_LIBRARY_RELEASE)

    find_library(
        ICU_I18N_LIBRARY_DEBUG
        NAMES ${ICU_I18N_NAMES_DEBUG}
        HINTS ${PC_ICU_I18N_LIBRARY_DIRS}
              ${PC_ICU_I18N_LIBDIR}
              ${WEBKIT_LIBRARIES_LINK_DIR}
        DOC "Libraries to link against for ICU internationalization (Debug)")
    mark_as_advanced(ICU_I18N_LIBRARY_DEBUG)

    if(ICU_I18N_LIBRARY_RELEASE AND ICU_I18N_LIBRARY_DEBUG)
        set(ICU_I18N_LIBRARY
            debug ${ICU_I18N_LIBRARY_DEBUG}
            optimized ${ICU_I18N_LIBRARY_RELEASE}
            CACHE FILEPATH "Libraries to link against for ICU internationalization")
    else()
        set(ICU_I18N_LIBRARY ${ICU_I18N_LIBRARY_RELEASE} CACHE FILEPATH "Libraries to link against for ICU internationalization")
    endif()
    mark_as_advanced(ICU_I18N_LIBRARY)
    unset(ICU_I18N_NAMES_RELEASE)
    unset(ICU_I18N_NAMES_DEBUG)

    if (ICU_I18N_LIBRARY)
        set(ICU_I18N_FOUND 1)
        set(ICU_I18N_LIBRARIES ${ICU_I18N_LIBRARY})
    else ()
        set(ICU_I18N_FOUND 0)
        set(ICU_I18N_LIBRARIES)
    endif ()

    # Look for the ICU data libraries
    set(ICU_DATALIB_NAMES_RELEASE icudata libicudata cygicudata cygicudata32 icudt)
    set(ICU_DATALIB_NAMES_DEBUG icudatad libicudatad cygicudatad cygicudata32d icudtd)

    find_library(
        ICU_DATA_LIBRARY_RELEASE
        NAMES ${ICU_DATALIB_NAMES_RELEASE}
        HINTS ${PC_ICU_I18N_LIBRARY_DIRS}
              ${PC_ICU_I18N_LIBDIR}
              ${WEBKIT_LIBRARIES_LINK_DIR}
        DOC "Libraries to link against for ICU data (Release)")
    mark_as_advanced(ICU_DATA_LIBRARY_RELEASE)

    find_library(
        ICU_DATA_LIBRARY_DEBUG
        NAMES ${ICU_DATALIB_NAMES_DEBUG}
        HINTS ${PC_ICU_I18N_LIBRARY_DIRS}
              ${PC_ICU_I18N_LIBDIR}
              ${WEBKIT_LIBRARIES_LINK_DIR}
        DOC "Libraries to link against for ICU data (DEBUG)")
    mark_as_advanced(ICU_DATA_LIBRARY_DEBUG)

    if(ICU_DATA_LIBRARY_RELEASE AND ICU_DATA_LIBRARY_DEBUG)
        set(ICU_DATA_LIBRARY
            debug ${ICU_DATA_LIBRARY_DEBUG}
            optimized ${ICU_DATA_LIBRARY_RELEASE}
            CACHE FILEPATH "Libraries to link against for ICU data")
    else()
        set(ICU_DATA_LIBRARY ${ICU_DATA_LIBRARY_RELEASE} CACHE FILEPATH "Libraries to link against for ICU data")
    endif()
    mark_as_advanced(ICU_DATA_LIBRARY)
    unset(ICU_DATALIB_NAMES_RELEASE)
    unset(ICU_DATALIB_NAMES_DEBUG)


    if (ICU_DATA_LIBRARY)
        set(ICU_DATA_FOUND 1)
        set(ICU_DATA_LIBRARIES ${ICU_DATA_LIBRARY})
    else ()
        set(ICU_DATA_FOUND 0)
        set(ICU_DATA_LIBRARIES)
    endif ()
else ()
    set(ICU_FOUND 0)
    set(ICU_I18N_FOUND 0)
    set(ICU_DATA_FOUND 0)
    set(ICU_LIBRARIES)
    set(ICU_I18N_LIBRARIES)
    set(ICU_DATA_LIBRARIES)
    set(ICU_INCLUDE_DIRS)
    set(ICU_VERSION)
    set(ICU_MAJOR_VERSION)
    set(ICU_MINOR_VERSION)
endif ()

if (ICU_FOUND)
    if (NOT ICU_FIND_QUIETLY)
        message(STATUS "Found ICU header files in ${ICU_INCLUDE_DIRS}")
        message(STATUS "Found ICU libraries: ${ICU_LIBRARIES}")
        message(STATUS "Found ICU internationaliation libraries: ${ICU_I18N_LIBRARIES}")
        message(STATUS "Found ICU data libraries: ${ICU_DATA_LIBRARIES}")
    endif ()
else ()
    if (ICU_FIND_REQUIRED)
        message(FATAL_ERROR "Could not find ICU")
    else ()
        message(STATUS "Optional package ICU was not found")
    endif ()
endif ()

cmake config Release:

-- The C compiler identification is MSVC 19.10.25019.0
-- The CXX compiler identification is MSVC 19.10.25019.0
-- Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.10.25017/bin/HostX64/x86/cl.exe
-- Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.10.25017/bin/HostX64/x86/cl.exe -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.10.25017/bin/HostX64/x86/cl.exe
-- Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.10.25017/bin/HostX64/x86/cl.exe -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found BISON: C:/vcpkg/downloads/tools/winflexbison/win_bison.exe (found suitable version "3.0.4", minimum required is "2.1") 
-- Found Gperf: C:/vcpkg/downloads/tools/gperf/bin/gperf.exe (Required is at least version "3.0.1") 
-- Found Perl: C:/Perl64/bin/perl.exe (found suitable version "5.24.1", minimum required is "5.10.0") 
-- Found PythonInterp: C:/Python27amd64/python.exe (found suitable version "2.7.13", minimum required is "2.7.0") 
-- Could NOT find Ruby (missing:  RUBY_LIBRARY) (found suitable version "2.3.0", minimum required is "1.9")
-- Looking for include file features.h
-- Looking for include file features.h - not found
-- Disabling ENABLE_QT_WEBCHANNEL since ENABLE_WEBKIT2 is disabled.
-- Found Sqlite: C:/vcpkg/installed/x86-windows/include  
-- Looking for pthread.h
-- Looking for pthread.h - not found
-- Found Threads: TRUE  
-- Found JPEG: C:/vcpkg/installed/x86-windows/lib/jpeg.lib  
-- Found ZLIB: C:/vcpkg/installed/x86-windows/lib/zlib.lib (found version "1.2.11") 
-- Found PNG: C:/vcpkg/installed/x86-windows/lib/libpng16.lib (found version "1.6.28") 
-- Could NOT find PkgConfig (missing:  PKG_CONFIG_EXECUTABLE) 
-- Found ICU header files in C:/vcpkg/installed/x86-windows/include
-- Found ICU libraries: C:/vcpkg/installed/x86-windows/lib/icuuc.lib
-- Found ICU internationaliation libraries: C:/vcpkg/installed/x86-windows/lib/icuin.lib
-- Found ICU data libraries: C:/vcpkg/installed/x86-windows/lib/icudt.lib
-- Found LibXml2: C:/vcpkg/installed/x86-windows/lib/libxml2.lib (found suitable version "2.9.4", minimum required is "2.8.0") 
-- Found LibXslt: C:/vcpkg/installed/x86-windows/lib/libxslt.lib (found suitable version "1.1.29", minimum required is "1.1.7") 
-- Found Fontconfig: C:/vcpkg/installed/x86-windows/lib/fontconfig.lib  
-- Could NOT find PkgConfig (missing:  PKG_CONFIG_EXECUTABLE) 
-- Found WEBP: C:/vcpkg/installed/x86-windows/include  
-- The following OPTIONAL packages have been found:

 * Fontconfig
 * WebP
 * Qt5OpenGL (required version >= 5.2.0)

-- The following REQUIRED packages have been found:

 * BISON (required version >= 2.1)
 * Gperf (required version >= 3.0.1)
 * Perl (required version >= 5.10.0)
 * PythonInterp (required version >= 2.7.0)
 * Sqlite
 * Threads
 * JPEG
 * PNG
 * ZLIB
 * ICU
 * LibXml2 (required version >= 2.8.0)
 * LibXslt (required version >= 1.1.7)
 * Qt5Core
 * Qt5Gui
 * Qt5Network
 * Qt5Widgets
 * Qt5Positioning
 * Qt5Sensors
 * Qt5PrintSupport
   Required for ENABLE_PRINT_SUPPORT=ON
 * Qt5 (required version >= 5.2.0)
 * Ruby (required version >= 1.9)

-- The following OPTIONAL packages have not been found:

 * PkgConfig

-- Using platform-specific CMakeLists: C:/vcpkg/buildtrees/qtwebkit/src/qtwebkit-5.8.0/Source/WTF/wtf/PlatformQt.cmake
-- The ASM_MASM compiler identification is MSVC
-- Found assembler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.10.25017/bin/HostX64/x86/ml.exe
-- Using platform-specific CMakeLists: C:/vcpkg/buildtrees/qtwebkit/src/qtwebkit-5.8.0/Source/JavaScriptCore/PlatformQt.cmake
-- Using platform-specific CMakeLists: C:/vcpkg/buildtrees/qtwebkit/src/qtwebkit-5.8.0/Source/JavaScriptCore/shell/PlatformQt.cmake
-- All-in-One build is enabled.
-- Using platform-specific CMakeLists: C:/vcpkg/buildtrees/qtwebkit/src/qtwebkit-5.8.0/Source/WebCore/PlatformQt.cmake
-- Using platform-specific CMakeLists: C:/vcpkg/buildtrees/qtwebkit/src/qtwebkit-5.8.0/Source/WebKit/PlatformQt.cmake
-- Using platform-specific CMakeLists: C:/vcpkg/buildtrees/qtwebkit/src/qtwebkit-5.8.0/Source/PlatformQt.cmake
-- Using platform-specific CMakeLists: C:/vcpkg/buildtrees/qtwebkit/src/qtwebkit-5.8.0/Tools/PlatformQt.cmake
-- Enabled features:
--  ENABLE_ACCELERATED_2D_CANVAS ............ ON
--  ENABLE_ALLINONE_BUILD                     ON
--  ENABLE_API_TESTS ........................ OFF
--  ENABLE_CSS_GRID_LAYOUT                    ON
--  ENABLE_DATABASE_PROCESS ................. ON
--  ENABLE_DATALIST_ELEMENT                   ON
--  ENABLE_DEVICE_ORIENTATION ............... ON
--  ENABLE_DRAG_SUPPORT                       ON
--  ENABLE_FULLSCREEN_API ................... ON
--  ENABLE_GAMEPAD_DEPRECATED                 OFF
--  ENABLE_GEOLOCATION ...................... ON
--  ENABLE_ICONDATABASE                       ON
--  ENABLE_INDEXED_DATABASE ................. ON
--  ENABLE_INSPECTOR_UI                       ON
--  ENABLE_JIT .............................. ON
--  ENABLE_LEGACY_WEB_AUDIO                   OFF
--  ENABLE_LINK_PREFETCH .................... ON
--  ENABLE_MEDIA_SOURCE                       OFF
--  ENABLE_NETSCAPE_PLUGIN_API .............. ON
--  ENABLE_OPENGL                             ON
--  ENABLE_PRINT_SUPPORT .................... ON
--  ENABLE_QT_GESTURE_EVENTS                  ON
--  ENABLE_QT_WEBCHANNEL .................... OFF
--  ENABLE_SAMPLING_PROFILER                  ON
--  ENABLE_SPELLCHECK ....................... ON
--  ENABLE_TOUCH_EVENTS                       ON
--  ENABLE_VIDEO ............................ ON
--  ENABLE_WEBKIT2                            OFF
--  ENABLE_WEB_AUDIO ........................ OFF
--  ENABLE_X11_TARGET                         OFF
--  ENABLE_XSLT ............................. ON
--  USE_GSTREAMER                             OFF
--  USE_LIBHYPHEN ........................... OFF
--  USE_MEDIA_FOUNDATION                      ON
--  USE_QT_MULTIMEDIA ....................... OFF
--  USE_SYSTEM_MALLOC                         1
--  USE_WOFF2 ............................... ON
-- Configuring done
-- Generating done
-- Build files have been written to: C:/vcpkg/buildtrees/qtwebkit/x86-windows-rel

cmake configure Debug:

-- The C compiler identification is MSVC 19.10.25019.0
-- The CXX compiler identification is MSVC 19.10.25019.0
-- Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.10.25017/bin/HostX64/x86/cl.exe
-- Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.10.25017/bin/HostX64/x86/cl.exe -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.10.25017/bin/HostX64/x86/cl.exe
-- Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.10.25017/bin/HostX64/x86/cl.exe -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found BISON: C:/vcpkg/downloads/tools/winflexbison/win_bison.exe (found suitable version "3.0.4", minimum required is "2.1") 
-- Found Gperf: C:/vcpkg/downloads/tools/gperf/bin/gperf.exe (Required is at least version "3.0.1") 
-- Found Perl: C:/Perl64/bin/perl.exe (found suitable version "5.24.1", minimum required is "5.10.0") 
-- Found PythonInterp: C:/Python27amd64/python.exe (found suitable version "2.7.13", minimum required is "2.7.0") 
-- Could NOT find Ruby (missing:  RUBY_LIBRARY) (found suitable version "2.3.0", minimum required is "1.9")
-- Looking for include file features.h
-- Looking for include file features.h - not found
-- Disabling ENABLE_QT_WEBCHANNEL since ENABLE_WEBKIT2 is disabled.
-- Found Sqlite: C:/vcpkg/installed/x86-windows/include  
-- Looking for pthread.h
-- Looking for pthread.h - not found
-- Found Threads: TRUE  
-- Found JPEG: C:/vcpkg/installed/x86-windows/debug/lib/jpeg.lib  
-- Found ZLIB: optimized;C:/vcpkg/installed/x86-windows/lib/zlib.lib;debug;C:/vcpkg/installed/x86-windows/debug/lib/zlibd.lib (found version "1.2.11") 
-- Found PNG: optimized;C:/vcpkg/installed/x86-windows/lib/libpng16.lib;debug;C:/vcpkg/installed/x86-windows/debug/lib/libpng16d.lib (found version "1.6.28") 
-- Could NOT find PkgConfig (missing:  PKG_CONFIG_EXECUTABLE) 
-- Found ICU header files in C:/vcpkg/installed/x86-windows/include
-- Found ICU libraries: debug;C:/vcpkg/installed/x86-windows/debug/lib/icuucd.lib;optimized;C:/vcpkg/installed/x86-windows/lib/icuuc.lib
-- Found ICU internationaliation libraries: debug;C:/vcpkg/installed/x86-windows/debug/lib/icuind.lib;optimized;C:/vcpkg/installed/x86-windows/lib/icuin.lib
-- Found ICU data libraries: debug;C:/vcpkg/installed/x86-windows/debug/lib/icudtd.lib;optimized;C:/vcpkg/installed/x86-windows/lib/icudt.lib
-- Found LibXml2: C:/vcpkg/installed/x86-windows/debug/lib/libxml2.lib (found suitable version "2.9.4", minimum required is "2.8.0") 
-- Found LibXslt: C:/vcpkg/installed/x86-windows/debug/lib/libxslt.lib (found suitable version "1.1.29", minimum required is "1.1.7") 
-- Found Fontconfig: C:/vcpkg/installed/x86-windows/debug/lib/fontconfig.lib  
-- Could NOT find PkgConfig (missing:  PKG_CONFIG_EXECUTABLE) 
-- Found WEBP: C:/vcpkg/installed/x86-windows/include  
-- The following OPTIONAL packages have been found:

 * Fontconfig
 * WebP
 * Qt5OpenGL (required version >= 5.2.0)

-- The following REQUIRED packages have been found:

 * BISON (required version >= 2.1)
 * Gperf (required version >= 3.0.1)
 * Perl (required version >= 5.10.0)
 * PythonInterp (required version >= 2.7.0)
 * Sqlite
 * Threads
 * JPEG
 * PNG
 * ZLIB
 * ICU
 * LibXml2 (required version >= 2.8.0)
 * LibXslt (required version >= 1.1.7)
 * Qt5Core
 * Qt5Gui
 * Qt5Network
 * Qt5Widgets
 * Qt5Positioning
 * Qt5Sensors
 * Qt5PrintSupport
   Required for ENABLE_PRINT_SUPPORT=ON
 * Qt5 (required version >= 5.2.0)
 * Ruby (required version >= 1.9)

-- The following OPTIONAL packages have not been found:

 * PkgConfig

-- Using platform-specific CMakeLists: C:/vcpkg/buildtrees/qtwebkit/src/qtwebkit-5.8.0/Source/WTF/wtf/PlatformQt.cmake
-- The ASM_MASM compiler identification is MSVC
-- Found assembler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.10.25017/bin/HostX64/x86/ml.exe
-- Using platform-specific CMakeLists: C:/vcpkg/buildtrees/qtwebkit/src/qtwebkit-5.8.0/Source/JavaScriptCore/PlatformQt.cmake
-- Using platform-specific CMakeLists: C:/vcpkg/buildtrees/qtwebkit/src/qtwebkit-5.8.0/Source/JavaScriptCore/shell/PlatformQt.cmake
-- All-in-One build is enabled.
-- Using platform-specific CMakeLists: C:/vcpkg/buildtrees/qtwebkit/src/qtwebkit-5.8.0/Source/WebCore/PlatformQt.cmake
-- Using platform-specific CMakeLists: C:/vcpkg/buildtrees/qtwebkit/src/qtwebkit-5.8.0/Source/WebKit/PlatformQt.cmake
-- Using platform-specific CMakeLists: C:/vcpkg/buildtrees/qtwebkit/src/qtwebkit-5.8.0/Source/PlatformQt.cmake
-- Using platform-specific CMakeLists: C:/vcpkg/buildtrees/qtwebkit/src/qtwebkit-5.8.0/Tools/PlatformQt.cmake
-- Enabled features:
--  ENABLE_ACCELERATED_2D_CANVAS ............ ON
--  ENABLE_ALLINONE_BUILD                     ON
--  ENABLE_API_TESTS ........................ OFF
--  ENABLE_CSS_GRID_LAYOUT                    ON
--  ENABLE_DATABASE_PROCESS ................. ON
--  ENABLE_DATALIST_ELEMENT                   ON
--  ENABLE_DEVICE_ORIENTATION ............... ON
--  ENABLE_DRAG_SUPPORT                       ON
--  ENABLE_FULLSCREEN_API ................... ON
--  ENABLE_GAMEPAD_DEPRECATED                 OFF
--  ENABLE_GEOLOCATION ...................... ON
--  ENABLE_ICONDATABASE                       ON
--  ENABLE_INDEXED_DATABASE ................. ON
--  ENABLE_INSPECTOR_UI                       ON
--  ENABLE_JIT .............................. ON
--  ENABLE_LEGACY_WEB_AUDIO                   OFF
--  ENABLE_LINK_PREFETCH .................... ON
--  ENABLE_MEDIA_SOURCE                       OFF
--  ENABLE_NETSCAPE_PLUGIN_API .............. ON
--  ENABLE_OPENGL                             ON
--  ENABLE_PRINT_SUPPORT .................... ON
--  ENABLE_QT_GESTURE_EVENTS                  ON
--  ENABLE_QT_WEBCHANNEL .................... OFF
--  ENABLE_SAMPLING_PROFILER                  ON
--  ENABLE_SPELLCHECK ....................... ON
--  ENABLE_TOUCH_EVENTS                       ON
--  ENABLE_VIDEO ............................ ON
--  ENABLE_WEBKIT2                            OFF
--  ENABLE_WEB_AUDIO ........................ OFF
--  ENABLE_X11_TARGET                         OFF
--  ENABLE_XSLT ............................. ON
--  USE_GSTREAMER                             OFF
--  USE_LIBHYPHEN ........................... OFF
--  USE_MEDIA_FOUNDATION                      ON
--  USE_QT_MULTIMEDIA ....................... OFF
--  USE_SYSTEM_MALLOC                         1
--  USE_WOFF2 ............................... ON
-- Configuring done
-- Generating done
-- Build files have been written to: C:/vcpkg/buildtrees/qtwebkit/x86-windows-dbg

CMakeCache.txt for Release configuration (vcpkg separates Release and Debug build folders):

$ grep -i ICU CMakeCache.txt
//Libraries to link against for ICU data
ICU_DATA_LIBRARY:FILEPATH=C:/vcpkg/installed/x86-windows/lib/icudt.lib
//Libraries to link against for ICU data (DEBUG)
ICU_DATA_LIBRARY_DEBUG:FILEPATH=ICU_DATA_LIBRARY_DEBUG-NOTFOUND
//Libraries to link against for ICU data (Release)
ICU_DATA_LIBRARY_RELEASE:FILEPATH=C:/vcpkg/installed/x86-windows/lib/icudt.lib
//Libraries to link against for ICU internationalization
ICU_I18N_LIBRARY:FILEPATH=C:/vcpkg/installed/x86-windows/lib/icuin.lib
//Libraries to link against for ICU internationalization (Debug)
ICU_I18N_LIBRARY_DEBUG:FILEPATH=ICU_I18N_LIBRARY_DEBUG-NOTFOUND
//Libraries to link against for ICU internationalization (Release)
ICU_I18N_LIBRARY_RELEASE:FILEPATH=C:/vcpkg/installed/x86-windows/lib/icuin.lib
//Include directory for the ICU library
ICU_INCLUDE_DIR:PATH=C:/vcpkg/installed/x86-windows/include
//Libraries to link against for the common parts of ICU
ICU_LIBRARY:FILEPATH=C:/vcpkg/installed/x86-windows/lib/icuuc.lib
//Libraries to link against for the common parts of ICU (Debug)
ICU_LIBRARY_DEBUG:FILEPATH=ICU_LIBRARY_DEBUG-NOTFOUND
//Libraries to link against for the common parts of ICU (Release)
ICU_LIBRARY_RELEASE:FILEPATH=C:/vcpkg/installed/x86-windows/lib/icuuc.lib
JavaScriptCore_LIB_DEPENDS:STATIC=general;WTF;general;C:/vcpkg/installed/x86-windows/lib/icuin.lib;general;Qt5::Core;
WTF_LIB_DEPENDS:STATIC=general;C:/vcpkg/installed/x86-windows/lib/icuin.lib;general;C:/vcpkg/installed/x86-windows/lib/icuuc.lib;general;Qt5::Core;general;winmm;
WebCore_LIB_DEPENDS:STATIC=general;C:/vcpkg/installed/x86-windows/lib/icuuc.lib;general;JavaScriptCore;general;WTF;general;woff2;general;C:/vcpkg/installed/x86-windows/lib/jpeg.lib;general;C:/vcpkg/installed/x86-windows/lib/libpng16.lib;general;C:/vcpkg/installed/x86-windows/lib/zlib.lib;general;C:/vcpkg/installed/x86-windows/lib/webp.lib;general;Shlwapi;general;version;general;C:/vcpkg/installed/x86-windows/lib/libxml2.lib;general;C:/vcpkg/installed/x86-windows/lib/libxslt.lib;general;Qt5::Core;general;Qt5::Gui;general;Qt5::Network;general;Qt5::Sensors;general;C:/vcpkg/installed/x86-windows/lib/sqlite3.lib;general;C:/vcpkg/installed/x86-windows/lib/zlib.lib;general;mfuuid;general;strmbase;general;C:/vcpkg/installed/x86-windows/lib/icuuc.lib;general;JavaScriptCore;general;WTF;general;woff2;general;C:/vcpkg/installed/x86-windows/lib/jpeg.lib;general;C:/vcpkg/installed/x86-windows/lib/libpng16.lib;general;C:/vcpkg/installed/x86-windows/lib/zlib.lib;general;C:/vcpkg/installed/x86-windows/lib/webp.lib;general;Shlwapi;general;version;general;C:/vcpkg/installed/x86-windows/lib/libxml2.lib;general;C:/vcpkg/installed/x86-windows/lib/libxslt.lib;general;Qt5::Core;general;Qt5::Gui;general;Qt5::Network;general;Qt5::Sensors;general;C:/vcpkg/installed/x86-windows/lib/sqlite3.lib;general;C:/vcpkg/installed/x86-windows/lib/zlib.lib;general;mfuuid;general;strmbase;general;ANGLESupport;
WebKit_LIB_DEPENDS:STATIC=general;JavaScriptCore;general;WTF;general;WebCore;general;C:/vcpkg/installed/x86-windows/lib/icuuc.lib;general;Qt5::Positioning;general;Qt5::Core;general;Qt5::Gui;general;Qt5::Network;
//ADVANCED property for variable: ICU_DATA_LIBRARY
ICU_DATA_LIBRARY-ADVANCED:INTERNAL=1
//ADVANCED property for variable: ICU_DATA_LIBRARY_DEBUG
ICU_DATA_LIBRARY_DEBUG-ADVANCED:INTERNAL=1
//ADVANCED property for variable: ICU_DATA_LIBRARY_RELEASE
ICU_DATA_LIBRARY_RELEASE-ADVANCED:INTERNAL=1
//ADVANCED property for variable: ICU_I18N_LIBRARY
ICU_I18N_LIBRARY-ADVANCED:INTERNAL=1
//ADVANCED property for variable: ICU_I18N_LIBRARY_DEBUG
ICU_I18N_LIBRARY_DEBUG-ADVANCED:INTERNAL=1
//ADVANCED property for variable: ICU_I18N_LIBRARY_RELEASE
ICU_I18N_LIBRARY_RELEASE-ADVANCED:INTERNAL=1
//ADVANCED property for variable: ICU_INCLUDE_DIR
ICU_INCLUDE_DIR-ADVANCED:INTERNAL=1
//ADVANCED property for variable: ICU_LIBRARY
ICU_LIBRARY-ADVANCED:INTERNAL=1
//ADVANCED property for variable: ICU_LIBRARY_DEBUG
ICU_LIBRARY_DEBUG-ADVANCED:INTERNAL=1
//ADVANCED property for variable: ICU_LIBRARY_RELEASE
ICU_LIBRARY_RELEASE-ADVANCED:INTERNAL=1
PC_ICU_CFLAGS:INTERNAL=
PC_ICU_CFLAGS_I:INTERNAL=
PC_ICU_CFLAGS_OTHER:INTERNAL=
PC_ICU_FOUND:INTERNAL=
PC_ICU_I18N_CFLAGS:INTERNAL=
PC_ICU_I18N_CFLAGS_I:INTERNAL=
PC_ICU_I18N_CFLAGS_OTHER:INTERNAL=
PC_ICU_I18N_FOUND:INTERNAL=
PC_ICU_I18N_INCLUDEDIR:INTERNAL=
PC_ICU_I18N_LIBDIR:INTERNAL=
PC_ICU_I18N_LIBS:INTERNAL=
PC_ICU_I18N_LIBS_L:INTERNAL=
PC_ICU_I18N_LIBS_OTHER:INTERNAL=
PC_ICU_I18N_LIBS_PATHS:INTERNAL=
PC_ICU_I18N_PREFIX:INTERNAL=
PC_ICU_I18N_STATIC_CFLAGS:INTERNAL=
PC_ICU_I18N_STATIC_CFLAGS_I:INTERNAL=
PC_ICU_I18N_STATIC_CFLAGS_OTHER:INTERNAL=
PC_ICU_I18N_STATIC_LIBDIR:INTERNAL=
PC_ICU_I18N_STATIC_LIBS:INTERNAL=
PC_ICU_I18N_STATIC_LIBS_L:INTERNAL=
PC_ICU_I18N_STATIC_LIBS_OTHER:INTERNAL=
PC_ICU_I18N_STATIC_LIBS_PATHS:INTERNAL=
PC_ICU_I18N_VERSION:INTERNAL=
PC_ICU_INCLUDEDIR:INTERNAL=
PC_ICU_LIBDIR:INTERNAL=
PC_ICU_LIBS:INTERNAL=
PC_ICU_LIBS_L:INTERNAL=
PC_ICU_LIBS_OTHER:INTERNAL=
PC_ICU_LIBS_PATHS:INTERNAL=
PC_ICU_PREFIX:INTERNAL=
PC_ICU_STATIC_CFLAGS:INTERNAL=
PC_ICU_STATIC_CFLAGS_I:INTERNAL=
PC_ICU_STATIC_CFLAGS_OTHER:INTERNAL=
PC_ICU_STATIC_LIBDIR:INTERNAL=
PC_ICU_STATIC_LIBS:INTERNAL=
PC_ICU_STATIC_LIBS_L:INTERNAL=
PC_ICU_STATIC_LIBS_OTHER:INTERNAL=
PC_ICU_STATIC_LIBS_PATHS:INTERNAL=
PC_ICU_VERSION:INTERNAL=
__pkg_config_checked_PC_ICU:INTERNAL=1
__pkg_config_checked_PC_ICU_I18N:INTERNAL=1

Same thing for Debug configuration:

$ grep -i ICU CMakeCache.txt
//Libraries to link against for ICU data
ICU_DATA_LIBRARY:FILEPATH=debug;C:/vcpkg/installed/x86-windows/debug/lib/icudtd.lib;optimized;C:/vcpkg/installed/x86-windows/lib/icudt.lib
//Libraries to link against for ICU data (DEBUG)
ICU_DATA_LIBRARY_DEBUG:FILEPATH=C:/vcpkg/installed/x86-windows/debug/lib/icudtd.lib
//Libraries to link against for ICU data (Release)
ICU_DATA_LIBRARY_RELEASE:FILEPATH=C:/vcpkg/installed/x86-windows/lib/icudt.lib
//Libraries to link against for ICU internationalization
ICU_I18N_LIBRARY:FILEPATH=debug;C:/vcpkg/installed/x86-windows/debug/lib/icuind.lib;optimized;C:/vcpkg/installed/x86-windows/lib/icuin.lib
//Libraries to link against for ICU internationalization (Debug)
ICU_I18N_LIBRARY_DEBUG:FILEPATH=C:/vcpkg/installed/x86-windows/debug/lib/icuind.lib
//Libraries to link against for ICU internationalization (Release)
ICU_I18N_LIBRARY_RELEASE:FILEPATH=C:/vcpkg/installed/x86-windows/lib/icuin.lib
//Include directory for the ICU library
ICU_INCLUDE_DIR:PATH=C:/vcpkg/installed/x86-windows/include
//Libraries to link against for the common parts of ICU
ICU_LIBRARY:FILEPATH=debug;C:/vcpkg/installed/x86-windows/debug/lib/icuucd.lib;optimized;C:/vcpkg/installed/x86-windows/lib/icuuc.lib
//Libraries to link against for the common parts of ICU (Debug)
ICU_LIBRARY_DEBUG:FILEPATH=C:/vcpkg/installed/x86-windows/debug/lib/icuucd.lib
//Libraries to link against for the common parts of ICU (Release)
ICU_LIBRARY_RELEASE:FILEPATH=C:/vcpkg/installed/x86-windows/lib/icuuc.lib
JavaScriptCore_LIB_DEPENDS:STATIC=general;WTF;debug;C:/vcpkg/installed/x86-windows/debug/lib/icuind.lib;optimized;C:/vcpkg/installed/x86-windows/lib/icuin.lib;general;Qt5::Core;
WTF_LIB_DEPENDS:STATIC=debug;C:/vcpkg/installed/x86-windows/debug/lib/icuind.lib;optimized;C:/vcpkg/installed/x86-windows/lib/icuin.lib;debug;C:/vcpkg/installed/x86-windows/debug/lib/icuucd.lib;optimized;C:/vcpkg/installed/x86-windows/lib/icuuc.lib;general;Qt5::Core;general;winmm;
WebCore_LIB_DEPENDS:STATIC=debug;C:/vcpkg/installed/x86-windows/debug/lib/icuucd.lib;optimized;C:/vcpkg/installed/x86-windows/lib/icuuc.lib;general;JavaScriptCore;general;WTF;general;woff2;general;C:/vcpkg/installed/x86-windows/debug/lib/jpeg.lib;optimized;C:/vcpkg/installed/x86-windows/lib/libpng16.lib;debug;C:/vcpkg/installed/x86-windows/debug/lib/libpng16d.lib;optimized;C:/vcpkg/installed/x86-windows/lib/zlib.lib;debug;C:/vcpkg/installed/x86-windows/debug/lib/zlibd.lib;general;C:/vcpkg/installed/x86-windows/lib/webp.lib;general;Shlwapi;general;version;general;C:/vcpkg/installed/x86-windows/debug/lib/libxml2.lib;general;C:/vcpkg/installed/x86-windows/debug/lib/libxslt.lib;general;Qt5::Core;general;Qt5::Gui;general;Qt5::Network;general;Qt5::Sensors;general;C:/vcpkg/installed/x86-windows/debug/lib/sqlite3.lib;optimized;C:/vcpkg/installed/x86-windows/lib/zlib.lib;debug;C:/vcpkg/installed/x86-windows/debug/lib/zlibd.lib;general;mfuuid;general;strmbase;debug;C:/vcpkg/installed/x86-windows/debug/lib/icuucd.lib;optimized;C:/vcpkg/installed/x86-windows/lib/icuuc.lib;general;JavaScriptCore;general;WTF;general;woff2;general;C:/vcpkg/installed/x86-windows/debug/lib/jpeg.lib;optimized;C:/vcpkg/installed/x86-windows/lib/libpng16.lib;debug;C:/vcpkg/installed/x86-windows/debug/lib/libpng16d.lib;optimized;C:/vcpkg/installed/x86-windows/lib/zlib.lib;debug;C:/vcpkg/installed/x86-windows/debug/lib/zlibd.lib;general;C:/vcpkg/installed/x86-windows/lib/webp.lib;general;Shlwapi;general;version;general;C:/vcpkg/installed/x86-windows/debug/lib/libxml2.lib;general;C:/vcpkg/installed/x86-windows/debug/lib/libxslt.lib;general;Qt5::Core;general;Qt5::Gui;general;Qt5::Network;general;Qt5::Sensors;general;C:/vcpkg/installed/x86-windows/debug/lib/sqlite3.lib;optimized;C:/vcpkg/installed/x86-windows/lib/zlib.lib;debug;C:/vcpkg/installed/x86-windows/debug/lib/zlibd.lib;general;mfuuid;general;strmbase;general;ANGLESupport;
WebKit_LIB_DEPENDS:STATIC=general;JavaScriptCore;general;WTF;general;WebCore;debug;C:/vcpkg/installed/x86-windows/debug/lib/icuucd.lib;optimized;C:/vcpkg/installed/x86-windows/lib/icuuc.lib;general;Qt5::Positioning;general;Qt5::Core;general;Qt5::Gui;general;Qt5::Network;
//ADVANCED property for variable: ICU_DATA_LIBRARY
ICU_DATA_LIBRARY-ADVANCED:INTERNAL=1
//ADVANCED property for variable: ICU_DATA_LIBRARY_DEBUG
ICU_DATA_LIBRARY_DEBUG-ADVANCED:INTERNAL=1
//ADVANCED property for variable: ICU_DATA_LIBRARY_RELEASE
ICU_DATA_LIBRARY_RELEASE-ADVANCED:INTERNAL=1
//ADVANCED property for variable: ICU_I18N_LIBRARY
ICU_I18N_LIBRARY-ADVANCED:INTERNAL=1
//ADVANCED property for variable: ICU_I18N_LIBRARY_DEBUG
ICU_I18N_LIBRARY_DEBUG-ADVANCED:INTERNAL=1
//ADVANCED property for variable: ICU_I18N_LIBRARY_RELEASE
ICU_I18N_LIBRARY_RELEASE-ADVANCED:INTERNAL=1
//ADVANCED property for variable: ICU_INCLUDE_DIR
ICU_INCLUDE_DIR-ADVANCED:INTERNAL=1
//ADVANCED property for variable: ICU_LIBRARY
ICU_LIBRARY-ADVANCED:INTERNAL=1
//ADVANCED property for variable: ICU_LIBRARY_DEBUG
ICU_LIBRARY_DEBUG-ADVANCED:INTERNAL=1
//ADVANCED property for variable: ICU_LIBRARY_RELEASE
ICU_LIBRARY_RELEASE-ADVANCED:INTERNAL=1
PC_ICU_CFLAGS:INTERNAL=
PC_ICU_CFLAGS_I:INTERNAL=
PC_ICU_CFLAGS_OTHER:INTERNAL=
PC_ICU_FOUND:INTERNAL=
PC_ICU_I18N_CFLAGS:INTERNAL=
PC_ICU_I18N_CFLAGS_I:INTERNAL=
PC_ICU_I18N_CFLAGS_OTHER:INTERNAL=
PC_ICU_I18N_FOUND:INTERNAL=
PC_ICU_I18N_INCLUDEDIR:INTERNAL=
PC_ICU_I18N_LIBDIR:INTERNAL=
PC_ICU_I18N_LIBS:INTERNAL=
PC_ICU_I18N_LIBS_L:INTERNAL=
PC_ICU_I18N_LIBS_OTHER:INTERNAL=
PC_ICU_I18N_LIBS_PATHS:INTERNAL=
PC_ICU_I18N_PREFIX:INTERNAL=
PC_ICU_I18N_STATIC_CFLAGS:INTERNAL=
PC_ICU_I18N_STATIC_CFLAGS_I:INTERNAL=
PC_ICU_I18N_STATIC_CFLAGS_OTHER:INTERNAL=
PC_ICU_I18N_STATIC_LIBDIR:INTERNAL=
PC_ICU_I18N_STATIC_LIBS:INTERNAL=
PC_ICU_I18N_STATIC_LIBS_L:INTERNAL=
PC_ICU_I18N_STATIC_LIBS_OTHER:INTERNAL=
PC_ICU_I18N_STATIC_LIBS_PATHS:INTERNAL=
PC_ICU_I18N_VERSION:INTERNAL=
PC_ICU_INCLUDEDIR:INTERNAL=
PC_ICU_LIBDIR:INTERNAL=
PC_ICU_LIBS:INTERNAL=
PC_ICU_LIBS_L:INTERNAL=
PC_ICU_LIBS_OTHER:INTERNAL=
PC_ICU_LIBS_PATHS:INTERNAL=
PC_ICU_PREFIX:INTERNAL=
PC_ICU_STATIC_CFLAGS:INTERNAL=
PC_ICU_STATIC_CFLAGS_I:INTERNAL=
PC_ICU_STATIC_CFLAGS_OTHER:INTERNAL=
PC_ICU_STATIC_LIBDIR:INTERNAL=
PC_ICU_STATIC_LIBS:INTERNAL=
PC_ICU_STATIC_LIBS_L:INTERNAL=
PC_ICU_STATIC_LIBS_OTHER:INTERNAL=
PC_ICU_STATIC_LIBS_PATHS:INTERNAL=
PC_ICU_VERSION:INTERNAL=
__pkg_config_checked_PC_ICU:INTERNAL=1
__pkg_config_checked_PC_ICU_I18N:INTERNAL=1