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Fix incompatibilities with libxml2 >= 2.12.0. 

libxml2 changed the required signature of error handler callbacks
to make the passed xmlError struct "const".  This is causing build
failures on buildfarm member caiman, and no doubt will start showing
up in the field quite soon.  Add a version check to adjust the
declaration of xml_errorHandler() according to LIBXML_VERSION.

2.12.x also produces deprecation warnings for contrib/xml2/xpath.c's
assignment to xmlLoadExtDtdDefaultValue.  I see no good reason for
that to still be there, seeing that we disabled external DTDs (at a
lower level) years ago for security reasons.  Let's just remove it.

Back-patch to all supported branches, since they might all get built
with newer libxml2 once it gets a bit more popular.  (The back
branches produce another deprecation warning about xpath.c's use of
xmlSubstituteEntitiesDefault().  We ought to consider whether to
back-patch all or part of commit 65c5864d7 to silence that.  It's
less urgent though, since it won't break the buildfarm.)

Discussion: https://postgr.es/m/1389505.1706382262@sss.pgh.pa.us
This commit is contained in:
Tom Lane 2024-01-29 12:06:07 -05:00
parent e43425f481
commit 3f8ac13b19
2 changed files with 12 additions and 3 deletions
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1
contrib/xml2/xpath.c
View File

@ -75,7 +75,6 @@ pgxml_parser_init(PgXmlStrictness strictness)
xmlInitParser();
xmlSubstituteEntitiesDefault(1);
xmlLoadExtDtdDefaultValue = 1;
return xmlerrcxt;
}

14
src/backend/utils/adt/xml.c
View File

@ -65,6 +65,16 @@
#if LIBXML_VERSION >= 20704
#define HAVE_XMLSTRUCTUREDERRORCONTEXT 1
#endif
/*
* libxml2 2.12 decided to insert "const" into the error handler API.
*/
#if LIBXML_VERSION >= 21200
#define PgXmlErrorPtr const xmlError *
#else
#define PgXmlErrorPtr xmlErrorPtr
#endif
#endif /* USE_LIBXML */
#include "access/htup_details.h"
@ -119,7 +129,7 @@ struct PgXmlErrorContext
static xmlParserInputPtr xmlPgEntityLoader(const char *URL, const char *ID,
xmlParserCtxtPtr ctxt);
static void xml_errorHandler(void *data, xmlErrorPtr error);
static void xml_errorHandler(void *data, PgXmlErrorPtr error);
static void xml_ereport_by_code(int level, int sqlcode,
const char *msg, int errcode);
static void chopStringInfoNewlines(StringInfo str);
@ -1749,7 +1759,7 @@ xml_ereport(PgXmlErrorContext *errcxt, int level, int sqlcode, const char *msg)
* Error handler for libxml errors and warnings
*/
static void
xml_errorHandler(void *data, xmlErrorPtr error)
xml_errorHandler(void *data, PgXmlErrorPtr error)
{
PgXmlErrorContext *xmlerrcxt = (PgXmlErrorContext *) data;
xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) error->ctxt;