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diff --git a/intl/icu/source/common/unicode/unorm2.h b/intl/icu/source/common/unicode/unorm2.h
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+// Copyright (C) 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+*******************************************************************************
+*
+*   Copyright (C) 2009-2015, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+*
+*******************************************************************************
+*   file name:  unorm2.h
+*   encoding:   US-ASCII
+*   tab size:   8 (not used)
+*   indentation:4
+*
+*   created on: 2009dec15
+*   created by: Markus W. Scherer
+*/
+
+#ifndef __UNORM2_H__
+#define __UNORM2_H__
+
+/**
+ * \file
+ * \brief C API: New API for Unicode Normalization.
+ *
+ * Unicode normalization functionality for standard Unicode normalization or
+ * for using custom mapping tables.
+ * All instances of UNormalizer2 are unmodifiable/immutable.
+ * Instances returned by unorm2_getInstance() are singletons that must not be deleted by the caller.
+ * For more details see the Normalizer2 C++ class.
+ */
+
+#include "unicode/utypes.h"
+#include "unicode/localpointer.h"
+#include "unicode/uset.h"
+
+/**
+ * Constants for normalization modes.
+ * For details about standard Unicode normalization forms
+ * and about the algorithms which are also used with custom mapping tables
+ * see http://www.unicode.org/unicode/reports/tr15/
+ * @stable ICU 4.4
+ */
+typedef enum {
+    /**
+     * Decomposition followed by composition.
+     * Same as standard NFC when using an "nfc" instance.
+     * Same as standard NFKC when using an "nfkc" instance.
+     * For details about standard Unicode normalization forms
+     * see http://www.unicode.org/unicode/reports/tr15/
+     * @stable ICU 4.4
+     */
+    UNORM2_COMPOSE,
+    /**
+     * Map, and reorder canonically.
+     * Same as standard NFD when using an "nfc" instance.
+     * Same as standard NFKD when using an "nfkc" instance.
+     * For details about standard Unicode normalization forms
+     * see http://www.unicode.org/unicode/reports/tr15/
+     * @stable ICU 4.4
+     */
+    UNORM2_DECOMPOSE,
+    /**
+     * "Fast C or D" form.
+     * If a string is in this form, then further decomposition <i>without reordering</i>
+     * would yield the same form as DECOMPOSE.
+     * Text in "Fast C or D" form can be processed efficiently with data tables
+     * that are "canonically closed", that is, that provide equivalent data for
+     * equivalent text, without having to be fully normalized.
+     * Not a standard Unicode normalization form.
+     * Not a unique form: Different FCD strings can be canonically equivalent.
+     * For details see http://www.unicode.org/notes/tn5/#FCD
+     * @stable ICU 4.4
+     */
+    UNORM2_FCD,
+    /**
+     * Compose only contiguously.
+     * Also known as "FCC" or "Fast C Contiguous".
+     * The result will often but not always be in NFC.
+     * The result will conform to FCD which is useful for processing.
+     * Not a standard Unicode normalization form.
+     * For details see http://www.unicode.org/notes/tn5/#FCC
+     * @stable ICU 4.4
+     */
+    UNORM2_COMPOSE_CONTIGUOUS
+} UNormalization2Mode;
+
+/**
+ * Result values for normalization quick check functions.
+ * For details see http://www.unicode.org/reports/tr15/#Detecting_Normalization_Forms
+ * @stable ICU 2.0
+ */
+typedef enum UNormalizationCheckResult {
+  /**
+   * The input string is not in the normalization form.
+   * @stable ICU 2.0
+   */
+  UNORM_NO,
+  /**
+   * The input string is in the normalization form.
+   * @stable ICU 2.0
+   */
+  UNORM_YES,
+  /**
+   * The input string may or may not be in the normalization form.
+   * This value is only returned for composition forms like NFC and FCC,
+   * when a backward-combining character is found for which the surrounding text
+   * would have to be analyzed further.
+   * @stable ICU 2.0
+   */
+  UNORM_MAYBE
+} UNormalizationCheckResult;
+
+/**
+ * Opaque C service object type for the new normalization API.
+ * @stable ICU 4.4
+ */
+struct UNormalizer2;
+typedef struct UNormalizer2 UNormalizer2;  /**< C typedef for struct UNormalizer2. @stable ICU 4.4 */
+
+#if !UCONFIG_NO_NORMALIZATION
+
+/**
+ * Returns a UNormalizer2 instance for Unicode NFC normalization.
+ * Same as unorm2_getInstance(NULL, "nfc", UNORM2_COMPOSE, pErrorCode).
+ * Returns an unmodifiable singleton instance. Do not delete it.
+ * @param pErrorCode Standard ICU error code. Its input value must
+ *                  pass the U_SUCCESS() test, or else the function returns
+ *                  immediately. Check for U_FAILURE() on output or use with
+ *                  function chaining. (See User Guide for details.)
+ * @return the requested Normalizer2, if successful
+ * @stable ICU 49
+ */
+U_STABLE const UNormalizer2 * U_EXPORT2
+unorm2_getNFCInstance(UErrorCode *pErrorCode);
+
+/**
+ * Returns a UNormalizer2 instance for Unicode NFD normalization.
+ * Same as unorm2_getInstance(NULL, "nfc", UNORM2_DECOMPOSE, pErrorCode).
+ * Returns an unmodifiable singleton instance. Do not delete it.
+ * @param pErrorCode Standard ICU error code. Its input value must
+ *                  pass the U_SUCCESS() test, or else the function returns
+ *                  immediately. Check for U_FAILURE() on output or use with
+ *                  function chaining. (See User Guide for details.)
+ * @return the requested Normalizer2, if successful
+ * @stable ICU 49
+ */
+U_STABLE const UNormalizer2 * U_EXPORT2
+unorm2_getNFDInstance(UErrorCode *pErrorCode);
+
+/**
+ * Returns a UNormalizer2 instance for Unicode NFKC normalization.
+ * Same as unorm2_getInstance(NULL, "nfkc", UNORM2_COMPOSE, pErrorCode).
+ * Returns an unmodifiable singleton instance. Do not delete it.
+ * @param pErrorCode Standard ICU error code. Its input value must
+ *                  pass the U_SUCCESS() test, or else the function returns
+ *                  immediately. Check for U_FAILURE() on output or use with
+ *                  function chaining. (See User Guide for details.)
+ * @return the requested Normalizer2, if successful
+ * @stable ICU 49
+ */
+U_STABLE const UNormalizer2 * U_EXPORT2
+unorm2_getNFKCInstance(UErrorCode *pErrorCode);
+
+/**
+ * Returns a UNormalizer2 instance for Unicode NFKD normalization.
+ * Same as unorm2_getInstance(NULL, "nfkc", UNORM2_DECOMPOSE, pErrorCode).
+ * Returns an unmodifiable singleton instance. Do not delete it.
+ * @param pErrorCode Standard ICU error code. Its input value must
+ *                  pass the U_SUCCESS() test, or else the function returns
+ *                  immediately. Check for U_FAILURE() on output or use with
+ *                  function chaining. (See User Guide for details.)
+ * @return the requested Normalizer2, if successful
+ * @stable ICU 49
+ */
+U_STABLE const UNormalizer2 * U_EXPORT2
+unorm2_getNFKDInstance(UErrorCode *pErrorCode);
+
+/**
+ * Returns a UNormalizer2 instance for Unicode NFKC_Casefold normalization.
+ * Same as unorm2_getInstance(NULL, "nfkc_cf", UNORM2_COMPOSE, pErrorCode).
+ * Returns an unmodifiable singleton instance. Do not delete it.
+ * @param pErrorCode Standard ICU error code. Its input value must
+ *                  pass the U_SUCCESS() test, or else the function returns
+ *                  immediately. Check for U_FAILURE() on output or use with
+ *                  function chaining. (See User Guide for details.)
+ * @return the requested Normalizer2, if successful
+ * @stable ICU 49
+ */
+U_STABLE const UNormalizer2 * U_EXPORT2
+unorm2_getNFKCCasefoldInstance(UErrorCode *pErrorCode);
+
+/**
+ * Returns a UNormalizer2 instance which uses the specified data file
+ * (packageName/name similar to ucnv_openPackage() and ures_open()/ResourceBundle)
+ * and which composes or decomposes text according to the specified mode.
+ * Returns an unmodifiable singleton instance. Do not delete it.
+ *
+ * Use packageName=NULL for data files that are part of ICU's own data.
+ * Use name="nfc" and UNORM2_COMPOSE/UNORM2_DECOMPOSE for Unicode standard NFC/NFD.
+ * Use name="nfkc" and UNORM2_COMPOSE/UNORM2_DECOMPOSE for Unicode standard NFKC/NFKD.
+ * Use name="nfkc_cf" and UNORM2_COMPOSE for Unicode standard NFKC_CF=NFKC_Casefold.
+ *
+ * @param packageName NULL for ICU built-in data, otherwise application data package name
+ * @param name "nfc" or "nfkc" or "nfkc_cf" or name of custom data file
+ * @param mode normalization mode (compose or decompose etc.)
+ * @param pErrorCode Standard ICU error code. Its input value must
+ *                  pass the U_SUCCESS() test, or else the function returns
+ *                  immediately. Check for U_FAILURE() on output or use with
+ *                  function chaining. (See User Guide for details.)
+ * @return the requested UNormalizer2, if successful
+ * @stable ICU 4.4
+ */
+U_STABLE const UNormalizer2 * U_EXPORT2
+unorm2_getInstance(const char *packageName,
+                   const char *name,
+                   UNormalization2Mode mode,
+                   UErrorCode *pErrorCode);
+
+/**
+ * Constructs a filtered normalizer wrapping any UNormalizer2 instance
+ * and a filter set.
+ * Both are aliased and must not be modified or deleted while this object
+ * is used.
+ * The filter set should be frozen; otherwise the performance will suffer greatly.
+ * @param norm2 wrapped UNormalizer2 instance
+ * @param filterSet USet which determines the characters to be normalized
+ * @param pErrorCode Standard ICU error code. Its input value must
+ *                   pass the U_SUCCESS() test, or else the function returns
+ *                   immediately. Check for U_FAILURE() on output or use with
+ *                   function chaining. (See User Guide for details.)
+ * @return the requested UNormalizer2, if successful
+ * @stable ICU 4.4
+ */
+U_STABLE UNormalizer2 * U_EXPORT2
+unorm2_openFiltered(const UNormalizer2 *norm2, const USet *filterSet, UErrorCode *pErrorCode);
+
+/**
+ * Closes a UNormalizer2 instance from unorm2_openFiltered().
+ * Do not close instances from unorm2_getInstance()!
+ * @param norm2 UNormalizer2 instance to be closed
+ * @stable ICU 4.4
+ */
+U_STABLE void U_EXPORT2
+unorm2_close(UNormalizer2 *norm2);
+
+#if U_SHOW_CPLUSPLUS_API
+
+U_NAMESPACE_BEGIN
+
+/**
+ * \class LocalUNormalizer2Pointer
+ * "Smart pointer" class, closes a UNormalizer2 via unorm2_close().
+ * For most methods see the LocalPointerBase base class.
+ *
+ * @see LocalPointerBase
+ * @see LocalPointer
+ * @stable ICU 4.4
+ */
+U_DEFINE_LOCAL_OPEN_POINTER(LocalUNormalizer2Pointer, UNormalizer2, unorm2_close);
+
+U_NAMESPACE_END
+
+#endif
+
+/**
+ * Writes the normalized form of the source string to the destination string
+ * (replacing its contents) and returns the length of the destination string.
+ * The source and destination strings must be different buffers.
+ * @param norm2 UNormalizer2 instance
+ * @param src source string
+ * @param length length of the source string, or -1 if NUL-terminated
+ * @param dest destination string; its contents is replaced with normalized src
+ * @param capacity number of UChars that can be written to dest
+ * @param pErrorCode Standard ICU error code. Its input value must
+ *                   pass the U_SUCCESS() test, or else the function returns
+ *                   immediately. Check for U_FAILURE() on output or use with
+ *                   function chaining. (See User Guide for details.)
+ * @return dest
+ * @stable ICU 4.4
+ */
+U_STABLE int32_t U_EXPORT2
+unorm2_normalize(const UNormalizer2 *norm2,
+                 const UChar *src, int32_t length,
+                 UChar *dest, int32_t capacity,
+                 UErrorCode *pErrorCode);
+/**
+ * Appends the normalized form of the second string to the first string
+ * (merging them at the boundary) and returns the length of the first string.
+ * The result is normalized if the first string was normalized.
+ * The first and second strings must be different buffers.
+ * @param norm2 UNormalizer2 instance
+ * @param first string, should be normalized
+ * @param firstLength length of the first string, or -1 if NUL-terminated
+ * @param firstCapacity number of UChars that can be written to first
+ * @param second string, will be normalized
+ * @param secondLength length of the source string, or -1 if NUL-terminated
+ * @param pErrorCode Standard ICU error code. Its input value must
+ *                   pass the U_SUCCESS() test, or else the function returns
+ *                   immediately. Check for U_FAILURE() on output or use with
+ *                   function chaining. (See User Guide for details.)
+ * @return first
+ * @stable ICU 4.4
+ */
+U_STABLE int32_t U_EXPORT2
+unorm2_normalizeSecondAndAppend(const UNormalizer2 *norm2,
+                                UChar *first, int32_t firstLength, int32_t firstCapacity,
+                                const UChar *second, int32_t secondLength,
+                                UErrorCode *pErrorCode);
+/**
+ * Appends the second string to the first string
+ * (merging them at the boundary) and returns the length of the first string.
+ * The result is normalized if both the strings were normalized.
+ * The first and second strings must be different buffers.
+ * @param norm2 UNormalizer2 instance
+ * @param first string, should be normalized
+ * @param firstLength length of the first string, or -1 if NUL-terminated
+ * @param firstCapacity number of UChars that can be written to first
+ * @param second string, should be normalized
+ * @param secondLength length of the source string, or -1 if NUL-terminated
+ * @param pErrorCode Standard ICU error code. Its input value must
+ *                   pass the U_SUCCESS() test, or else the function returns
+ *                   immediately. Check for U_FAILURE() on output or use with
+ *                   function chaining. (See User Guide for details.)
+ * @return first
+ * @stable ICU 4.4
+ */
+U_STABLE int32_t U_EXPORT2
+unorm2_append(const UNormalizer2 *norm2,
+              UChar *first, int32_t firstLength, int32_t firstCapacity,
+              const UChar *second, int32_t secondLength,
+              UErrorCode *pErrorCode);
+
+/**
+ * Gets the decomposition mapping of c.
+ * Roughly equivalent to normalizing the String form of c
+ * on a UNORM2_DECOMPOSE UNormalizer2 instance, but much faster, and except that this function
+ * returns a negative value and does not write a string
+ * if c does not have a decomposition mapping in this instance's data.
+ * This function is independent of the mode of the UNormalizer2.
+ * @param norm2 UNormalizer2 instance
+ * @param c code point
+ * @param decomposition String buffer which will be set to c's
+ *                      decomposition mapping, if there is one.
+ * @param capacity number of UChars that can be written to decomposition
+ * @param pErrorCode Standard ICU error code. Its input value must
+ *                   pass the U_SUCCESS() test, or else the function returns
+ *                   immediately. Check for U_FAILURE() on output or use with
+ *                   function chaining. (See User Guide for details.)
+ * @return the non-negative length of c's decomposition, if there is one; otherwise a negative value
+ * @stable ICU 4.6
+ */
+U_STABLE int32_t U_EXPORT2
+unorm2_getDecomposition(const UNormalizer2 *norm2,
+                        UChar32 c, UChar *decomposition, int32_t capacity,
+                        UErrorCode *pErrorCode);
+
+/**
+ * Gets the raw decomposition mapping of c.
+ *
+ * This is similar to the unorm2_getDecomposition() function but returns the
+ * raw decomposition mapping as specified in UnicodeData.txt or
+ * (for custom data) in the mapping files processed by the gennorm2 tool.
+ * By contrast, unorm2_getDecomposition() returns the processed,
+ * recursively-decomposed version of this mapping.
+ *
+ * When used on a standard NFKC Normalizer2 instance,
+ * unorm2_getRawDecomposition() returns the Unicode Decomposition_Mapping (dm) property.
+ *
+ * When used on a standard NFC Normalizer2 instance,
+ * it returns the Decomposition_Mapping only if the Decomposition_Type (dt) is Canonical (Can);
+ * in this case, the result contains either one or two code points (=1..4 UChars).
+ *
+ * This function is independent of the mode of the UNormalizer2.
+ * @param norm2 UNormalizer2 instance
+ * @param c code point
+ * @param decomposition String buffer which will be set to c's
+ *                      raw decomposition mapping, if there is one.
+ * @param capacity number of UChars that can be written to decomposition
+ * @param pErrorCode Standard ICU error code. Its input value must
+ *                   pass the U_SUCCESS() test, or else the function returns
+ *                   immediately. Check for U_FAILURE() on output or use with
+ *                   function chaining. (See User Guide for details.)
+ * @return the non-negative length of c's raw decomposition, if there is one; otherwise a negative value
+ * @stable ICU 49
+ */
+U_STABLE int32_t U_EXPORT2
+unorm2_getRawDecomposition(const UNormalizer2 *norm2,
+                           UChar32 c, UChar *decomposition, int32_t capacity,
+                           UErrorCode *pErrorCode);
+
+/**
+ * Performs pairwise composition of a & b and returns the composite if there is one.
+ *
+ * Returns a composite code point c only if c has a two-way mapping to a+b.
+ * In standard Unicode normalization, this means that
+ * c has a canonical decomposition to a+b
+ * and c does not have the Full_Composition_Exclusion property.
+ *
+ * This function is independent of the mode of the UNormalizer2.
+ * @param norm2 UNormalizer2 instance
+ * @param a A (normalization starter) code point.
+ * @param b Another code point.
+ * @return The non-negative composite code point if there is one; otherwise a negative value.
+ * @stable ICU 49
+ */
+U_STABLE UChar32 U_EXPORT2
+unorm2_composePair(const UNormalizer2 *norm2, UChar32 a, UChar32 b);
+
+/**
+ * Gets the combining class of c.
+ * The default implementation returns 0
+ * but all standard implementations return the Unicode Canonical_Combining_Class value.
+ * @param norm2 UNormalizer2 instance
+ * @param c code point
+ * @return c's combining class
+ * @stable ICU 49
+ */
+U_STABLE uint8_t U_EXPORT2
+unorm2_getCombiningClass(const UNormalizer2 *norm2, UChar32 c);
+
+/**
+ * Tests if the string is normalized.
+ * Internally, in cases where the quickCheck() method would return "maybe"
+ * (which is only possible for the two COMPOSE modes) this method
+ * resolves to "yes" or "no" to provide a definitive result,
+ * at the cost of doing more work in those cases.
+ * @param norm2 UNormalizer2 instance
+ * @param s input string
+ * @param length length of the string, or -1 if NUL-terminated
+ * @param pErrorCode Standard ICU error code. Its input value must
+ *                   pass the U_SUCCESS() test, or else the function returns
+ *                   immediately. Check for U_FAILURE() on output or use with
+ *                   function chaining. (See User Guide for details.)
+ * @return TRUE if s is normalized
+ * @stable ICU 4.4
+ */
+U_STABLE UBool U_EXPORT2
+unorm2_isNormalized(const UNormalizer2 *norm2,
+                    const UChar *s, int32_t length,
+                    UErrorCode *pErrorCode);
+
+/**
+ * Tests if the string is normalized.
+ * For the two COMPOSE modes, the result could be "maybe" in cases that
+ * would take a little more work to resolve definitively.
+ * Use spanQuickCheckYes() and normalizeSecondAndAppend() for a faster
+ * combination of quick check + normalization, to avoid
+ * re-checking the "yes" prefix.
+ * @param norm2 UNormalizer2 instance
+ * @param s input string
+ * @param length length of the string, or -1 if NUL-terminated
+ * @param pErrorCode Standard ICU error code. Its input value must
+ *                   pass the U_SUCCESS() test, or else the function returns
+ *                   immediately. Check for U_FAILURE() on output or use with
+ *                   function chaining. (See User Guide for details.)
+ * @return UNormalizationCheckResult
+ * @stable ICU 4.4
+ */
+U_STABLE UNormalizationCheckResult U_EXPORT2
+unorm2_quickCheck(const UNormalizer2 *norm2,
+                  const UChar *s, int32_t length,
+                  UErrorCode *pErrorCode);
+
+/**
+ * Returns the end of the normalized substring of the input string.
+ * In other words, with <code>end=spanQuickCheckYes(s, ec);</code>
+ * the substring <code>UnicodeString(s, 0, end)</code>
+ * will pass the quick check with a "yes" result.
+ *
+ * The returned end index is usually one or more characters before the
+ * "no" or "maybe" character: The end index is at a normalization boundary.
+ * (See the class documentation for more about normalization boundaries.)
+ *
+ * When the goal is a normalized string and most input strings are expected
+ * to be normalized already, then call this method,
+ * and if it returns a prefix shorter than the input string,
+ * copy that prefix and use normalizeSecondAndAppend() for the remainder.
+ * @param norm2 UNormalizer2 instance
+ * @param s input string
+ * @param length length of the string, or -1 if NUL-terminated
+ * @param pErrorCode Standard ICU error code. Its input value must
+ *                   pass the U_SUCCESS() test, or else the function returns
+ *                   immediately. Check for U_FAILURE() on output or use with
+ *                   function chaining. (See User Guide for details.)
+ * @return "yes" span end index
+ * @stable ICU 4.4
+ */
+U_STABLE int32_t U_EXPORT2
+unorm2_spanQuickCheckYes(const UNormalizer2 *norm2,
+                         const UChar *s, int32_t length,
+                         UErrorCode *pErrorCode);
+
+/**
+ * Tests if the character always has a normalization boundary before it,
+ * regardless of context.
+ * For details see the Normalizer2 base class documentation.
+ * @param norm2 UNormalizer2 instance
+ * @param c character to test
+ * @return TRUE if c has a normalization boundary before it
+ * @stable ICU 4.4
+ */
+U_STABLE UBool U_EXPORT2
+unorm2_hasBoundaryBefore(const UNormalizer2 *norm2, UChar32 c);
+
+/**
+ * Tests if the character always has a normalization boundary after it,
+ * regardless of context.
+ * For details see the Normalizer2 base class documentation.
+ * @param norm2 UNormalizer2 instance
+ * @param c character to test
+ * @return TRUE if c has a normalization boundary after it
+ * @stable ICU 4.4
+ */
+U_STABLE UBool U_EXPORT2
+unorm2_hasBoundaryAfter(const UNormalizer2 *norm2, UChar32 c);
+
+/**
+ * Tests if the character is normalization-inert.
+ * For details see the Normalizer2 base class documentation.
+ * @param norm2 UNormalizer2 instance
+ * @param c character to test
+ * @return TRUE if c is normalization-inert
+ * @stable ICU 4.4
+ */
+U_STABLE UBool U_EXPORT2
+unorm2_isInert(const UNormalizer2 *norm2, UChar32 c);
+
+/**
+ * Option bit for unorm_compare:
+ * Both input strings are assumed to fulfill FCD conditions.
+ * @stable ICU 2.2
+ */
+#define UNORM_INPUT_IS_FCD          0x20000
+
+/**
+ * Option bit for unorm_compare:
+ * Perform case-insensitive comparison.
+ * @stable ICU 2.2
+ */
+#define U_COMPARE_IGNORE_CASE       0x10000
+
+#ifndef U_COMPARE_CODE_POINT_ORDER
+/* see also unistr.h and ustring.h */
+/**
+ * Option bit for u_strCaseCompare, u_strcasecmp, unorm_compare, etc:
+ * Compare strings in code point order instead of code unit order.
+ * @stable ICU 2.2
+ */
+#define U_COMPARE_CODE_POINT_ORDER  0x8000
+#endif
+
+/**
+ * Compares two strings for canonical equivalence.
+ * Further options include case-insensitive comparison and
+ * code point order (as opposed to code unit order).
+ *
+ * Canonical equivalence between two strings is defined as their normalized
+ * forms (NFD or NFC) being identical.
+ * This function compares strings incrementally instead of normalizing
+ * (and optionally case-folding) both strings entirely,
+ * improving performance significantly.
+ *
+ * Bulk normalization is only necessary if the strings do not fulfill the FCD
+ * conditions. Only in this case, and only if the strings are relatively long,
+ * is memory allocated temporarily.
+ * For FCD strings and short non-FCD strings there is no memory allocation.
+ *
+ * Semantically, this is equivalent to
+ *   strcmp[CodePointOrder](NFD(foldCase(NFD(s1))), NFD(foldCase(NFD(s2))))
+ * where code point order and foldCase are all optional.
+ *
+ * UAX 21 2.5 Caseless Matching specifies that for a canonical caseless match
+ * the case folding must be performed first, then the normalization.
+ *
+ * @param s1 First source string.
+ * @param length1 Length of first source string, or -1 if NUL-terminated.
+ *
+ * @param s2 Second source string.
+ * @param length2 Length of second source string, or -1 if NUL-terminated.
+ *
+ * @param options A bit set of options:
+ *   - U_FOLD_CASE_DEFAULT or 0 is used for default options:
+ *     Case-sensitive comparison in code unit order, and the input strings
+ *     are quick-checked for FCD.
+ *
+ *   - UNORM_INPUT_IS_FCD
+ *     Set if the caller knows that both s1 and s2 fulfill the FCD conditions.
+ *     If not set, the function will quickCheck for FCD
+ *     and normalize if necessary.
+ *
+ *   - U_COMPARE_CODE_POINT_ORDER
+ *     Set to choose code point order instead of code unit order
+ *     (see u_strCompare for details).
+ *
+ *   - U_COMPARE_IGNORE_CASE
+ *     Set to compare strings case-insensitively using case folding,
+ *     instead of case-sensitively.
+ *     If set, then the following case folding options are used.
+ *
+ *   - Options as used with case-insensitive comparisons, currently:
+ *
+ *   - U_FOLD_CASE_EXCLUDE_SPECIAL_I
+ *    (see u_strCaseCompare for details)
+ *
+ *   - regular normalization options shifted left by UNORM_COMPARE_NORM_OPTIONS_SHIFT
+ *
+ * @param pErrorCode ICU error code in/out parameter.
+ *                   Must fulfill U_SUCCESS before the function call.
+ * @return <0 or 0 or >0 as usual for string comparisons
+ *
+ * @see unorm_normalize
+ * @see UNORM_FCD
+ * @see u_strCompare
+ * @see u_strCaseCompare
+ *
+ * @stable ICU 2.2
+ */
+U_STABLE int32_t U_EXPORT2
+unorm_compare(const UChar *s1, int32_t length1,
+              const UChar *s2, int32_t length2,
+              uint32_t options,
+              UErrorCode *pErrorCode);
+
+#endif  /* !UCONFIG_NO_NORMALIZATION */
+#endif  /* __UNORM2_H__ */