configure: Properly handle case where libunwind.h is not available.

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: e2ed6fb ("fatal-signal: Catch SIGSEGV and print backtrace.") Suggested-by: Ben Pfaff <[email protected]> Signed-off-by: Yi-Hung Wei <[email protected]> Signed-off-by: William Tu <[email protected]>
qlw · Oct 17, 2019 · 81a29c0 · 81a29c0
1 parent 15394e0
commit 81a29c0
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/m4/openvswitch.m4 b/m4/openvswitch.m4
@@ -640,7 +640,9 @@ AC_DEFUN([OVS_CHECK_UNBOUND],
 
 dnl Checks for libunwind.
 AC_DEFUN([OVS_CHECK_UNWIND],
-  [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"