On assertion failure, print backtrace if available.

Merge from gnulib, incorporating:
2012-08-24 execinfo: port to FreeBSD
2012-08-22 execinfo: new module
* admin/merge-gnulib (GNULIB_MODULES): Add execinfo.
* lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.
* lib/execinfo.c, lib/execinfo.in.h, m4/execinfo.m4: New files.
* src/alloc.c [ENABLE_CHECKING]: Include <execinfo.h>.
(die) [ENABLE_CHECKING]: Print a backtrace if available.
* src/Makefile.in (LIB_EXECINFO): New macro.
(LIBES): Use it.

2 files changed, 6 insertions, 1 deletions

diff --git a/admin/ChangeLog b/admin/ChangeLog
index ea977e80cfa..0c674b91ea4 100644
--- a/admin/ChangeLog
+++ b/admin/ChangeLog
@@ -1,3 +1,8 @@
+2012-08-24  Paul Eggert  <eggert@cs.ucla.edu>
+
+        On assertion failure, print backtrace if available.
+        * merge-gnulib (GNULIB_MODULES): Add execinfo.
+
 2012-08-16  Paul Eggert  <eggert@cs.ucla.edu>
 
         Use ASCII tests for character types.
diff --git a/admin/merge-gnulib b/admin/merge-gnulib
index 63865edf3ce..775d43e68d3 100755
--- a/admin/merge-gnulib
+++ b/admin/merge-gnulib
@@ -28,7 +28,7 @@ GNULIB_URL=git://git.savannah.gnu.org/gnulib.git
 GNULIB_MODULES='
   alloca-opt c-ctype c-strcase
   careadlinkat crypto/md5 crypto/sha1 crypto/sha256 crypto/sha512
-  dtoastr dtotimespec dup2 environ
+  dtoastr dtotimespec dup2 environ execinfo
   filemode getloadavg getopt-gnu gettime gettimeofday
   ignore-value intprops largefile lstat
   manywarnings mktime pselect pthread_sigmask readlink