From a36ec8cfdb8764e4f8bf6b16a149a60ea6ad038d Mon Sep 17 00:00:00 2001
From: Doug Nazar <nazard@nazar.ca>
Date: Wed, 4 Sep 2019 23:36:06 -0400
Subject: Add support for zlib compressed elf .debug_frame sections

In case zlib support is not available, fail to load instead of
crashing while trying to read invalid data.
---
 configure.ac | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 8e62b8bd..11aeb2d2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -302,6 +302,23 @@ fi
 AC_SUBST([LIBLZMA])
 AM_CONDITIONAL(HAVE_LZMA, test x$enable_minidebuginfo = xyes)
 
+LIBZ=
+AC_MSG_CHECKING([whether to support ZLIB-compressed symbol tables])
+AC_ARG_ENABLE(zlibdebuginfo,
+AS_HELP_STRING([--enable-zlibdebuginfo], [Enables support for ZLIB-compressed symbol tables]),, [enable_zlibdebuginfo=auto])
+AC_MSG_RESULT([$enable_zlibdebuginfo])
+if test x$enable_zlibdebuginfo != xno; then
+   AC_CHECK_LIB([z], [uncompress],
+   [LIBZ=-lz
+    AC_DEFINE([HAVE_ZLIB], [1], [Define if you have libz])
+    enable_zlibdebuginfo=yes],
+   [if test x$enable_zlibdebuginfo = xyes; then
+      AC_MSG_FAILURE([libz not found])
+    fi])
+fi
+AC_SUBST([LIBZ])
+AM_CONDITIONAL(HAVE_ZLIB, test x$enable_zlibdebuginfo = xyes)
+
 AC_MSG_CHECKING([whether to support UNW_CACHE_PER_THREAD])
 AC_ARG_ENABLE([per-thread-cache],
 AS_HELP_STRING([--enable-per-thread-cache], [build with support for UNW_CACHE_PER_THREAD (which imposes a hight TLS memory usage) (default: disabled)]))
-- 
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