ext/libxml: Fix build failure with libxml2 2.15.

Fix GH-22752

libxml2 2.15 removed the built-in HTTP client, the FTP module, the
functions in xmlunicode.h, the shell and several other legacy symbols.
The Windows export list php_libxml2.def still referenced them, so the
statically linked build failed with hundreds of unresolved external
symbols.

Move the removed symbols into a separate php_libxml2_legacy.def and add
it only when building against libxml2 < 2.15, keeping the exports intact
for 2.11 through 2.14.

Author: devnexen

ext/libxml/config.w32

@@ -12,11 +12,17 @@ if (PHP_LIBXML == "yes") {
 		if (GREP_HEADER("libxml/xmlversion.h", "#define\\s+LIBXML_VERSION\\s+(\\d+)", PHP_PHP_BUILD + "\\include\\libxml2") &&
 				+RegExp.$1 >= 20904) {
 
+			var libxml_ver = +RegExp.$1; /* capture now; RegExp.$1 gets clobbered below */
+
 			EXTENSION("libxml", "libxml.c mime_sniff.c", false /* never shared */, "/DZEND_ENABLE_STATIC_TSRMLS_CACHE=1");
 			AC_DEFINE("HAVE_LIBXML", 1, "Define to 1 if the PHP extension 'libxml' is available.");
 			ADD_FLAG("CFLAGS_LIBXML", "/D LIBXML_STATIC /D LIBXML_STATIC_FOR_DLL /D HAVE_WIN32_THREADS ");
 			if (!PHP_LIBXML_SHARED) {
 				ADD_DEF_FILE("ext\\libxml\\php_libxml2.def");
+				if (libxml_ver < 21500) {
+					/* HTTP/FTP modules, xmlunicode.h and other legacy symbols were removed in libxml2 2.15 */
+					ADD_DEF_FILE("ext\\libxml\\php_libxml2_legacy.def");
+				}
 			}
 			PHP_INSTALL_HEADERS("ext/libxml", "php_libxml.h");
 		} else {

ext/libxml/php_libxml2.def

@@ -1,23 +1,14 @@
 EXPORTS
-__htmlDefaultSAXHandler
 __oldXMLWDcompatibility
 __xmlBufferAllocScheme
 __xmlDefaultBufferSize
-__xmlDefaultSAXHandler
-__xmlDefaultSAXLocator
 __xmlDeregisterNodeDefaultValue
 __xmlDoValidityCheckingDefaultValue
 xmlFree DATA
 __xmlGenericError
 __xmlGenericErrorContext
 __xmlGetWarningsDefaultValue
 __xmlIndentTreeOutput
-xmlIsBaseCharGroup DATA
-xmlIsCharGroup DATA
-xmlIsCombiningGroup DATA
-xmlIsDigitGroup DATA
-xmlIsExtenderGroup DATA
-xmlIsIdeographicGroup DATA
 xmlIsPubidChar_tab DATA
 __xmlKeepBlanksDefaultValue
 xmlLastError DATA
@@ -44,7 +35,6 @@ __xmlTreeIndentString
 xmlXPathNAN DATA
 xmlXPathNINF DATA
 xmlXPathPINF DATA
-UTF8ToHtml
 UTF8Toisolat1
 attribute
 attributeDecl
@@ -443,11 +433,6 @@ xmlIOFTPClose
 xmlIOFTPMatch
 xmlIOFTPOpen
 xmlIOFTPRead
-xmlIOHTTPClose
-xmlIOHTTPMatch
-xmlIOHTTPOpen
-xmlIOHTTPOpenW
-xmlIOHTTPRead
 xmlIOParseDTD
 xmlInitCharEncodingHandlers
 xmlInitGlobals
@@ -533,45 +518,6 @@ xmlMutexUnlock
 xmlNamespaceParseNCName
 xmlNamespaceParseNSDef
 xmlNamespaceParseQName
-xmlNanoFTPCheckResponse
-xmlNanoFTPCleanup
-xmlNanoFTPClose
-xmlNanoFTPCloseConnection
-xmlNanoFTPConnect
-xmlNanoFTPConnectTo
-xmlNanoFTPCwd
-xmlNanoFTPDele
-xmlNanoFTPFreeCtxt
-xmlNanoFTPGet
-xmlNanoFTPGetConnection
-xmlNanoFTPGetResponse
-xmlNanoFTPGetSocket
-xmlNanoFTPInit
-xmlNanoFTPList
-xmlNanoFTPNewCtxt
-xmlNanoFTPOpen
-xmlNanoFTPProxy
-xmlNanoFTPQuit
-xmlNanoFTPRead
-xmlNanoFTPScanProxy
-xmlNanoFTPUpdateURL
-xmlNanoHTTPAuthHeader
-xmlNanoHTTPCleanup
-xmlNanoHTTPClose
-xmlNanoHTTPContentLength
-xmlNanoHTTPEncoding
-xmlNanoHTTPFetch
-xmlNanoHTTPInit
-xmlNanoHTTPMethod
-xmlNanoHTTPMethodRedir
-xmlNanoHTTPMimeType
-xmlNanoHTTPOpen
-xmlNanoHTTPOpenRedir
-xmlNanoHTTPRead
-xmlNanoHTTPRedir
-xmlNanoHTTPReturnCode
-xmlNanoHTTPSave
-xmlNanoHTTPScanProxy
 xmlNewAutomata
 xmlNewCDataBlock
 xmlNewCatalog
@@ -783,7 +729,6 @@ xmlRegexpPrint
 xmlRegisterCharEncodingHandler
 xmlRegisterDefaultInputCallbacks
 xmlRegisterDefaultOutputCallbacks
-xmlRegisterHTTPPostCallbacks
 xmlRegisterInputCallbacks
 xmlRegisterNodeDefault
 xmlRegisterOutputCallbacks
@@ -929,20 +874,6 @@ xmlSetProp
 xmlSetStructuredErrorFunc
 xmlSetTreeDoc
 xmlSetupParserForBuffer
-xmlShell
-xmlShellBase
-xmlShellCat
-xmlShellDir
-xmlShellDu
-xmlShellList
-xmlShellLoad
-xmlShellPrintNode
-xmlShellPrintXPathError
-xmlShellPrintXPathResult
-xmlShellPwd
-xmlShellSave
-xmlShellValidate
-xmlShellWrite
 xmlSkipBlankChars
 xmlSnprintfElementContent
 xmlSplitQName
@@ -1135,172 +1066,6 @@ xmlThrDefSetGenericErrorFunc
 xmlThrDefSetStructuredErrorFunc
 xmlThrDefSubstituteEntitiesDefaultValue
 xmlThrDefTreeIndentString
-xmlUCSIsAegeanNumbers
-xmlUCSIsAlphabeticPresentationForms
-xmlUCSIsArabic
-xmlUCSIsArabicPresentationFormsA
-xmlUCSIsArabicPresentationFormsB
-xmlUCSIsArmenian
-xmlUCSIsArrows
-xmlUCSIsBasicLatin
-xmlUCSIsBengali
-xmlUCSIsBlock
-xmlUCSIsBlockElements
-xmlUCSIsBopomofo
-xmlUCSIsBopomofoExtended
-xmlUCSIsBoxDrawing
-xmlUCSIsBraillePatterns
-xmlUCSIsBuhid
-xmlUCSIsByzantineMusicalSymbols
-xmlUCSIsCJKCompatibility
-xmlUCSIsCJKCompatibilityForms
-xmlUCSIsCJKCompatibilityIdeographs
-xmlUCSIsCJKCompatibilityIdeographsSupplement
-xmlUCSIsCJKRadicalsSupplement
-xmlUCSIsCJKSymbolsandPunctuation
-xmlUCSIsCJKUnifiedIdeographs
-xmlUCSIsCJKUnifiedIdeographsExtensionA
-xmlUCSIsCJKUnifiedIdeographsExtensionB
-xmlUCSIsCat
-xmlUCSIsCatC
-xmlUCSIsCatCc
-xmlUCSIsCatCf
-xmlUCSIsCatCo
-xmlUCSIsCatCs
-xmlUCSIsCatL
-xmlUCSIsCatLl
-xmlUCSIsCatLm
-xmlUCSIsCatLo
-xmlUCSIsCatLt
-xmlUCSIsCatLu
-xmlUCSIsCatM
-xmlUCSIsCatMc
-xmlUCSIsCatMe
-xmlUCSIsCatMn
-xmlUCSIsCatN
-xmlUCSIsCatNd
-xmlUCSIsCatNl
-xmlUCSIsCatNo
-xmlUCSIsCatP
-xmlUCSIsCatPc
-xmlUCSIsCatPd
-xmlUCSIsCatPe
-xmlUCSIsCatPf
-xmlUCSIsCatPi
-xmlUCSIsCatPo
-xmlUCSIsCatPs
-xmlUCSIsCatS
-xmlUCSIsCatSc
-xmlUCSIsCatSk
-xmlUCSIsCatSm
-xmlUCSIsCatSo
-xmlUCSIsCatZ
-xmlUCSIsCatZl
-xmlUCSIsCatZp
-xmlUCSIsCatZs
-xmlUCSIsCherokee
-xmlUCSIsCombiningDiacriticalMarks
-xmlUCSIsCombiningDiacriticalMarksforSymbols
-xmlUCSIsCombiningHalfMarks
-xmlUCSIsCombiningMarksforSymbols
-xmlUCSIsControlPictures
-xmlUCSIsCurrencySymbols
-xmlUCSIsCypriotSyllabary
-xmlUCSIsCyrillic
-xmlUCSIsCyrillicSupplement
-xmlUCSIsDeseret
-xmlUCSIsDevanagari
-xmlUCSIsDingbats
-xmlUCSIsEnclosedAlphanumerics
-xmlUCSIsEnclosedCJKLettersandMonths
-xmlUCSIsEthiopic
-xmlUCSIsGeneralPunctuation
-xmlUCSIsGeometricShapes
-xmlUCSIsGeorgian
-xmlUCSIsGothic
-xmlUCSIsGreek
-xmlUCSIsGreekExtended
-xmlUCSIsGreekandCoptic
-xmlUCSIsGujarati
-xmlUCSIsGurmukhi
-xmlUCSIsHalfwidthandFullwidthForms
-xmlUCSIsHangulCompatibilityJamo
-xmlUCSIsHangulJamo
-xmlUCSIsHangulSyllables
-xmlUCSIsHanunoo
-xmlUCSIsHebrew
-xmlUCSIsHighPrivateUseSurrogates
-xmlUCSIsHighSurrogates
-xmlUCSIsHiragana
-xmlUCSIsIPAExtensions
-xmlUCSIsIdeographicDescriptionCharacters
-xmlUCSIsKanbun
-xmlUCSIsKangxiRadicals
-xmlUCSIsKannada
-xmlUCSIsKatakana
-xmlUCSIsKatakanaPhoneticExtensions
-xmlUCSIsKhmer
-xmlUCSIsKhmerSymbols
-xmlUCSIsLao
-xmlUCSIsLatin1Supplement
-xmlUCSIsLatinExtendedA
-xmlUCSIsLatinExtendedAdditional
-xmlUCSIsLatinExtendedB
-xmlUCSIsLetterlikeSymbols
-xmlUCSIsLimbu
-xmlUCSIsLinearBIdeograms
-xmlUCSIsLinearBSyllabary
-xmlUCSIsLowSurrogates
-xmlUCSIsMalayalam
-xmlUCSIsMathematicalAlphanumericSymbols
-xmlUCSIsMathematicalOperators
-xmlUCSIsMiscellaneousMathematicalSymbolsA
-xmlUCSIsMiscellaneousMathematicalSymbolsB
-xmlUCSIsMiscellaneousSymbols
-xmlUCSIsMiscellaneousSymbolsandArrows
-xmlUCSIsMiscellaneousTechnical
-xmlUCSIsMongolian
-xmlUCSIsMusicalSymbols
-xmlUCSIsMyanmar
-xmlUCSIsNumberForms
-xmlUCSIsOgham
-xmlUCSIsOldItalic
-xmlUCSIsOpticalCharacterRecognition
-xmlUCSIsOriya
-xmlUCSIsOsmanya
-xmlUCSIsPhoneticExtensions
-xmlUCSIsPrivateUse
-xmlUCSIsPrivateUseArea
-xmlUCSIsRunic
-xmlUCSIsShavian
-xmlUCSIsSinhala
-xmlUCSIsSmallFormVariants
-xmlUCSIsSpacingModifierLetters
-xmlUCSIsSpecials
-xmlUCSIsSuperscriptsandSubscripts
-xmlUCSIsSupplementalArrowsA
-xmlUCSIsSupplementalArrowsB
-xmlUCSIsSupplementalMathematicalOperators
-xmlUCSIsSupplementaryPrivateUseAreaA
-xmlUCSIsSupplementaryPrivateUseAreaB
-xmlUCSIsSyriac
-xmlUCSIsTagalog
-xmlUCSIsTagbanwa
-xmlUCSIsTags
-xmlUCSIsTaiLe
-xmlUCSIsTaiXuanJingSymbols
-xmlUCSIsTamil
-xmlUCSIsTelugu
-xmlUCSIsThaana
-xmlUCSIsThai
-xmlUCSIsTibetan
-xmlUCSIsUgaritic
-xmlUCSIsUnifiedCanadianAboriginalSyllabics
-xmlUCSIsVariationSelectors
-xmlUCSIsVariationSelectorsSupplement
-xmlUCSIsYiRadicals
-xmlUCSIsYiSyllables
-xmlUCSIsYijingHexagramSymbols
 xmlURIEscape
 xmlURIEscapeStr
 xmlURIUnescapeString