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[PATCH] fix build on uClibc without UCLIBC_HAS_BACKTRACE

Backtrace support is only used for logging on signal errors, which
isn't really critical, so simply remove backtrace info if not
available in uClibc.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
---
 src/log.c |    7 +++++++
 1 file changed, 7 insertions(+)

Index: ofono-1.5/src/log.c
===================================================================
--- ofono-1.5.orig/src/log.c
+++ ofono-1.5/src/log.c
@@ -30,7 +30,12 @@
 #include <stdlib.h>
 #include <string.h>
 #include <syslog.h>
+#include <features.h>
+/* backtrace support is optional on uClibc */
+#if !(defined(__UCLIBC__) && !defined (__UCLIBC_HAS_BACKTRACE__))
+#define HAVE_BACKTRACE
 #include <execinfo.h>
+#endif
 #include <dlfcn.h>
 
 #include "ofono.h"
@@ -115,6 +120,7 @@
 
 static void print_backtrace(unsigned int offset)
 {
+#ifdef HAVE_BACKTRACE
 	void *frames[99];
 	size_t n_ptrs;
 	unsigned int i;
@@ -213,6 +219,7 @@
 
 	close(outfd[1]);
 	close(infd[0]);
+#endif /* HAVE_BACKTRACE */
 }
 
 static void signal_handler(int signo)