* scripts/abilist.awk: New file.

* Makefile (distribute): Add it.
	* Makerules ($(objpfx)%.dynsym, $(objpfx)%.symlist): New rules.
	(tests): Depend on .symlist file for each $(install-lib.so-versioned).
	[! subdir] (tests): Depend on libc.symlist.
	(generated): Add those files.
	* aclocal.m4 (LIBC_PROG_BINUTILS): Check for objdump, set OBJDUMP.
	* configure: Regenerated.
	* config.make.in (OBJDUMP): New variable, substituted by configure.

	* malloc/mcheck.c (struct hdr): New members `block' and `magic2'.
	(mallochook, reallochook): Set them up.
	(checkhdr): Check HDR->magic2 value.
	(freehook): Reset HDR->magic2.
	(memalignhook): New static function.
	(old_memalign_hook): New static variable.
	(mcheck, reallochook): Set __memalign_hook to memalignhook.

scripts/abilist.awk

@@ -0,0 +1,49 @@
+# This awk script processes the output of objdump --dynamic-syms
+# into a simple format that should not change when the ABI is not changing.
+
+BEGIN { outpipe = "sort" }
+
+# Normalize columns.
+/^[0-9a-fA-F]+      / { sub(/      /, "  -   ") }
+
+# Skip undefineds.
+$4 == "*UND*" { next }
+
+# Skip locals.
+$2 == "l" { next }
+
+$2 == "g" || $2 == "w" && NF == 7 {
+  weak = ($2 == "w") ? "weak" : "strong";
+  type = $3;
+  size = strtonum("0x" $5);
+  version = $6;
+  symbol = $7;
+  gsub(/[()]/, "", version);
+
+  if (version == "GLIBC_PRIVATE") next;
+
+  if (type == "D" && $4 == ".tbss") {
+    print symbol, version, weak, "TLS", size | outpipe;
+  }
+  else if (type == "DO" && $4 == "*ABS*") {
+    print symbol, version, weak, "ABS" | outpipe;
+  }
+  else if (type == "DO") {
+    print symbol, version, weak, "DATA", size | outpipe;
+  }
+  else if (type == "DF") {
+    print symbol, version, weak, "FUNC" | outpipe;
+  }
+  else {
+    print symbol, version, weak, "UNEXPECTED", type, $4, $5;
+  }
+
+  next;
+}
+
+# Header crapola.
+NF == 0 || /DYNAMIC SYMBOL TABLE/ || /file format/ { next }
+
+{
+  print "Don't grok this line:", $0
+}