Define LIBXML_THREAD_ALLOC_ENABLED via xmlversion.h

Otherwise, direct calls to xmlFree() etc. from the application will
use a different set of allocation functions to what was used to allocate
the memory internally.

configure.in

@@ -954,6 +954,7 @@ WITH_THREADS=0
 THREAD_CFLAGS=""
 TEST_THREADS=""
 THREADS_W32=""
+WITH_THREAD_ALLOC=0
 
 if test "$with_threads" = "no" ; then
     echo Disabling multithreaded support
@@ -1017,7 +1018,7 @@ else
     fi
 fi
 if test "$with_thread_alloc" = "yes" -a "$WITH_THREADS" = "1" ; then
-    THREAD_CFLAGS="$THREAD_CFLAGS -DLIBXML_THREAD_ALLOC_ENABLED"
+    WITH_THREAD_ALLOC=1
 fi
 
 AC_SUBST(THREAD_LIBS)
@@ -1025,6 +1026,7 @@ AC_SUBST(BASE_THREAD_LIBS)
 AC_SUBST(WITH_THREADS)
 AC_SUBST(THREAD_CFLAGS)
 AC_SUBST(TEST_THREADS)
+AC_SUBST(WITH_THREAD_ALLOC)
 AM_CONDITIONAL([THREADS_W32],[test -n "$THREADS_W32"])
 
 dnl

include/libxml/xmlversion.h.in

@@ -97,6 +97,15 @@ XMLPUBFUN void XMLCALL xmlCheckVersion(int version);
 #endif
 #endif
 
+/**
+ * LIBXML_THREAD_ALLOC_ENABLED:
+ *
+ * Whether the allocation hooks are per-thread
+ */
+#if @WITH_THREAD_ALLOC@
+#define LIBXML_THREAD_ALLOC_ENABLED
+#endif
+
 /**
  * LIBXML_TREE_ENABLED:
  *