* configure.in: always check dladdr(1).

* addr2line.c (fill_lines): show the line number in C backtrace if
  ruby is built without --enable-shared (PIE) on Linux.
  patch is originally by Shinichiro Hamaji
  https://twitter.com/shinh/status/441957774264504321
  NOTE: ld doesn't insert __executable_start for PIE.
  dladdr(3)'s argument must be a function pointer.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45305 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,14 @@
+Mon Mar 10 12:14:26 2014  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* configure.in: always check dladdr(1).
+
+	* addr2line.c (fill_lines): show the line number in C backtrace if
+	  ruby is built without --enable-shared (PIE) on Linux.
+	  patch is originally by Shinichiro Hamaji
+	  https://twitter.com/shinh/status/441957774264504321
+	  NOTE: ld doesn't insert __executable_start for PIE.
+	  dladdr(3)'s argument must be a function pointer.
+
 Mon Mar 10 10:51:17 2014  ksss  <co000ri@gmail.com>
 
 	* test/ruby/test_enumerator.rb (test_iterators): fix test for hash

addr2line.c

@@ -514,6 +514,14 @@ fill_lines(int num_traces, void **traces, char **syms, int check_debuglink,
 	size_t len;
 	if (get_path_from_symbol(syms[i], &path, &len) &&
 		!strncmp(path, binary_filename, len)) {
+#if defined(HAVE_DLADDR) && defined(__pie__) && defined(__linux__)
+	    if (ehdr->e_type == ET_DYN && lines[i].base_addr == 0) {
+		Dl_info info;
+		if (dladdr(fill_lines, &info)) {
+		    lines[i].base_addr = (unsigned long)info.dli_fbase;
+		}
+	    }
+#endif
 	    lines[i].line = -1;
 	}
     }

configure.in

@@ -1897,6 +1897,7 @@ AC_CHECK_FUNCS(cosh)
 AC_CHECK_FUNCS(daemon)
 AC_CHECK_FUNCS(dl_iterate_phdr)
 AC_CHECK_FUNCS(dlopen)
+AC_CHECK_FUNCS(dladdr)
 AC_CHECK_FUNCS(dup)
 AC_CHECK_FUNCS(dup3)
 AC_CHECK_FUNCS(eaccess)
@@ -2946,7 +2947,6 @@ else
 	DLEXT=so])
 fi
 if test "$rb_cv_dlopen:$load_relative" = yes:yes; then
-    AC_CHECK_FUNCS(dladdr)
     if test "$ac_cv_func_dladdr" = yes; then
 	LOAD_RELATIVE=1
     fi