From 063bea58bcc1c27864a0351bba07254855903377 Mon Sep 17 00:00:00 2001
From: Nick Mathewson <nickm@torproject.org>
Date: Fri, 19 Jul 2013 14:09:58 -0400
Subject: Basic backtrace ability

On platforms with the backtrace/backtrace_symbols_fd interface, Tor
can now dump stack traces on assertion failure.  By default, I log
them to DataDir/stack_dump and to stderr.
---
 configure.ac | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 4aeec929e..5059079f7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -302,6 +302,8 @@ dnl exports strlcpy without defining it in a header.
 AC_CHECK_FUNCS(
         _NSGetEnviron \
         accept4 \
+        backtrace \
+        backtrace_symbols_fd \
         clock_gettime \
         flock \
         ftime \
@@ -319,6 +321,7 @@ AC_CHECK_FUNCS(
         memmem \
         prctl \
         rint \
+        sigaction \
         socketpair \
         strlcat \
         strlcpy \
@@ -802,6 +805,7 @@ dnl These headers are not essential
 AC_CHECK_HEADERS(
         arpa/inet.h \
         crt_externs.h \
+        execinfo.h \
         grp.h \
         ifaddrs.h \
         inttypes.h \
-- 
cgit v1.2.3


From b0023083c413c6447ef34cf3c6cfaf54a1cc8793 Mon Sep 17 00:00:00 2001
From: Nick Mathewson <nickm@torproject.org>
Date: Fri, 19 Jul 2013 14:18:43 -0400
Subject: On Linux (and some other systems) we need -rdynamic for backtraces

---
 configure.ac | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 5059079f7..8e247db32 100644
--- a/configure.ac
+++ b/configure.ac
@@ -593,6 +593,9 @@ if test x$enable_linker_hardening != xno; then
     TOR_CHECK_LDFLAGS(-z relro -z now, "$all_ldflags_for_check", "$all_libs_for_check")
 fi
 
+# For backtrace support
+TOR_CHECK_LDFLAGS(-rdynamic)
+
 dnl ------------------------------------------------------
 dnl Now see if we have a -fomit-frame-pointer compiler option.
 
-- 
cgit v1.2.3


From 2662885aa9cb6c9b7447b729d0321a633e8c46c3 Mon Sep 17 00:00:00 2001
From: Nick Mathewson <nickm@torproject.org>
Date: Fri, 26 Jul 2013 12:46:17 +0200
Subject: Use pc_from_ucontext.m4 from Google Performance Tools

This M4 module lets us learn the right way (out of at least 18
possibilities) to extract the current PC for stack-trace-fixup-in-signal
purposes.  The Google Performance Tools license is 3-clause BSD.
---
 configure.ac | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 8e247db32..06e9e3b37 100644
--- a/configure.ac
+++ b/configure.ac
@@ -937,6 +937,8 @@ AC_CHECK_SIZEOF(pid_t)
 
 AC_CHECK_TYPES([uint, u_char, ssize_t])
 
+AC_PC_FROM_UCONTEXT([/bin/true])
+
 dnl used to include sockaddr_storage, but everybody has that.
 AC_CHECK_TYPES([struct in6_addr, struct sockaddr_in6, sa_family_t], , ,
 [#ifdef HAVE_SYS_TYPES_H
-- 
cgit v1.2.3