configure.ac: add arg --with-libunwind

Add arg --with-libunwind for configure so it's optional to check
libunwind, which is helpfull to make deterministic builds.

Signed-off-by: Jackie Huang <jackie.huang@windriver.com>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

diff --git a/configure.ac b/configure.ac
index 0d5d486ca7f3edaecd4094ff5eb9b2392966f5bb..885cb394f6ca53e9fc09e286721037ff0e4ffc5c 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -60,13 +60,22 @@ PKG_PROG_PKG_CONFIG()
 PKG_CHECK_MODULES(MTDEV, [mtdev >= 1.1.0])
 PKG_CHECK_MODULES(LIBUDEV, [libudev])
 PKG_CHECK_MODULES(LIBEVDEV, [libevdev >= 0.4])
-PKG_CHECK_MODULES(LIBUNWIND,
+
+AC_ARG_WITH(libunwind,
+            AS_HELP_STRING([--without-libunwind],[Do not use libunwind]))
+
+AS_IF([test "x$with_libunwind" != "xno"],
+       [PKG_CHECK_MODULES(LIBUNWIND,
                  [libunwind],
                  [HAVE_LIBUNWIND=yes],
-                 [HAVE_LIBUNWIND=no])
-if test "x$HAVE_LIBUNWIND" = "xyes"; then
-       AC_DEFINE(HAVE_LIBUNWIND, 1, [Have libunwind support])
-fi
+                 [HAVE_LIBUNWIND=no])],
+       [HAVE_LIBUNWIND=no])
+
+AS_IF([test "x$HAVE_LIBUNWIND" = "xyes"],
+       [AC_DEFINE(HAVE_LIBUNWIND, 1, [Have libunwind support])],
+       [AS_IF([test "x$with_libunwind" = "xyes"],
+               [AC_MSG_ERROR([libunwind requested but not found])])])
+
 AM_CONDITIONAL(HAVE_LIBUNWIND, [test "x$HAVE_LIBUNWIND" = xyes])
 AC_PATH_PROG(ADDR2LINE, [addr2line])
 if test "x$ADDR2LINE" != "x"; then