build-sys: require elfutils >= 158

The recently added stacktrace support in 8d4e028f uses functions added
in elfutils 158. Check for one of the new functions to avoid attempting
to build against older versions.

diff --git a/configure.ac b/configure.ac
index 18e934c382123fe9341f65c10c5fb5cf21c59d42..bb6018f87decb325298d4f2b59d6f37a92b7c88d 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -672,7 +672,7 @@ AC_ARG_ENABLE([elfutils],
 if test "x${have_elfutils}" != xno ; then
         AC_CHECK_HEADERS(
                 [elfutils/libdwfl.h],
-                [have_elfutils=yes],
+                [],
                 [if test "x$have_elfutils" = xyes ; then
                         AC_MSG_ERROR([*** ELFUTILS headers not found.])
                 fi])
@@ -680,11 +680,19 @@ if test "x${have_elfutils}" != xno ; then
         AC_CHECK_LIB(
                 [dw],
                 [dwfl_begin],
-                [have_elfutils=yes],
+                [],
                 [if test "x$have_elfutils" = xyes ; then
                         AC_MSG_ERROR([*** ELFUTILS libs not found.])
                 fi])
 
+        AC_CHECK_LIB(
+                [dw],
+                [dwfl_core_file_attach],
+                [have_elfutils=yes],
+                [if test "x$have_elfutils" = xyes ; then
+                        AC_MSG_ERROR([*** ELFUTILS >= 158 is required.])
+                fi])
+
         if test "x$have_elfutils" = xyes ; then
                 ELFUTILS_LIBS="-lelf -ldw"
                 AC_DEFINE(HAVE_ELFUTILS, 1, [ELFUTILS available])