[ovs-dev] [PATCH v2] configure: Properly handle case where libunwind.h is not available.

Yi-Hung Wei yihung.wei at gmail.com
Thu Oct 17 04:35:55 UTC 2019

It is possible that user install libunwind but not libunwind-devel,
and it will run into a compilation error.  So we need to check the
existence of the library and the header file.

Fixes: e2ed6fbeb18c ("fatal-signal: Catch SIGSEGV and print backtrace.")
Suggested-by: Ben Pfaff <blp at ovn.org>
Signed-off-by: Yi-Hung Wei <yihung.wei at gmail.com>
 m4/openvswitch.m4 | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/m4/openvswitch.m4 b/m4/openvswitch.m4
index 79e0be5a33dd..fe323a020b9d 100644
--- a/m4/openvswitch.m4
+++ b/m4/openvswitch.m4
@@ -640,7 +640,9 @@ AC_DEFUN([OVS_CHECK_UNBOUND],
 dnl Checks for libunwind.
-  [AC_CHECK_LIB(unwind, unw_backtrace, [HAVE_UNWIND=yes], [HAVE_UNWIND=no])
+  [AC_CHECK_LIB([unwind], [unw_backtrace],
+   [AC_CHECK_HEADERS([libunwind.h], [HAVE_UNWIND=yes], [HAVE_UNWIND=no])],
+   [HAVE_UNWIND=no])
    if test "$HAVE_UNWIND" = yes; then
      AC_DEFINE([HAVE_UNWIND], [1], [Define to 1 if unwind is detected.])
      LIBS="$LIBS -lunwind"

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