timeval: Check for HAVE_BACKTRACE instead of HAVE_EXECINFO_H.

Other code in the tree uses HAVE_BACKTRACE and then blindly includes
<execinfo.h> if it is present, so this doesn't make anything worse.

Once we do that, HAVE_EXECINFO_H has no further users, so this commit also
removes the check for <execinfo.h>

Reported-by: YAMAMOTO Takashi <yamt@mwd.biglobe.ne.jp>
Signed-off-by: Ben Pfaff <blp@nicira.com>

diff --git a/configure.ac b/configure.ac
index 79fb46e..9f42941 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -61,7 +61,7 @@ OVS_CHECK_STRTOK_R
 AC_CHECK_MEMBERS([struct stat.st_mtim.tv_nsec, struct stat.st_mtimensec],
   [], [], [[#include <sys/stat.h>]])
 AC_CHECK_FUNCS([mlockall strnlen strsignal getloadavg statvfs setmntent])
-AC_CHECK_HEADERS([mntent.h sys/statvfs.h linux/types.h linux/if_ether.h execinfo.h])
+AC_CHECK_HEADERS([mntent.h sys/statvfs.h linux/types.h linux/if_ether.h])
 
 OVS_CHECK_PKIDIR
 OVS_CHECK_RUNDIR

diff --git a/lib/timeval.c b/lib/timeval.c
index 6e41514..163de1e 100644 (file)
--- a/lib/timeval.c
+++ b/lib/timeval.c
@@ -37,7 +37,7 @@
 
 /* backtrace() from <execinfo.h> is really useful, but it is not signal safe
  * everywhere, such as on x86-64.  */
-#if HAVE_EXECINFO_H && !defined __x86_64__
+#if HAVE_BACKTRACE && !defined __x86_64__
 #  define USE_BACKTRACE 1
 #  include <execinfo.h>
 #else