build: unconditionally try -rdynamic

-rdynamic is needed for useful backtraces and future plugin loading
support.  Try and enable it unconditionally.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>

diff --git a/configure.ac b/configure.ac
index 61b50d779e1639aeb7d160f0e25fb8cb677a52d1..6d0598b88840f224b909e202144a5c0347356855 100755 (executable)
--- a/configure.ac
+++ b/configure.ac
@@ -188,6 +188,20 @@ if test x"${enable_werror}" = x"yes" ; then
 fi
 AC_SUBST(WERROR)
 
+dnl need link on this one, not compile
+AC_LANG_PUSH(C)
+ac_ld_flag_save="$LDFLAGS"
+LDFLAGS="$LDFLAGS -rdynamic"
+AC_MSG_CHECKING([[whether linker supports -rdynamic]])
+AC_LINK_IFELSE(
+       [AC_LANG_PROGRAM([[]])],
+       [AC_MSG_RESULT([yes])],
+       [
+               LDFLAGS="$ac_ld_flag_save"
+               AC_MSG_RESULT([no])
+       ])
+AC_LANG_POP(C)
+
 dnl --------------
 dnl Check programs
 dnl --------------
@@ -298,8 +312,6 @@ AC_ARG_ENABLE(gcc_ultra_verbose,
   AS_HELP_STRING([--enable-gcc-ultra-verbose], [enable ultra verbose GCC warnings]))
 AC_ARG_ENABLE(linux24_tcp_md5,
   AS_HELP_STRING([--enable-linux24-tcp-md5], [enable support for old, Linux-2.4 RFC2385 patch]))
-AC_ARG_ENABLE(gcc-rdynamic,
-  AS_HELP_STRING([--enable-gcc-rdynamic], [enable linking with -rdynamic for better backtraces (default if gcc)]))
 AC_ARG_ENABLE(backtrace,
   AS_HELP_STRING([--disable-backtrace,], [disable crash backtraces (default autodetect)]))
 AC_ARG_ENABLE(time-check,
@@ -333,12 +345,6 @@ fi
 AC_ARG_ENABLE([dev_build],
     AS_HELP_STRING([--enable-dev-build], [build for development]))
 
-if test x"${enable_gcc_rdynamic}" != x"no" ; then
-  if test x"${enable_gcc_rdynamic}" = x"yes" -o x"$COMPILER" = x"GCC"; then
-    LDFLAGS="${LDFLAGS} -rdynamic"
-  fi
-fi
-
 if test x"${enable_time_check}" != x"no" ; then
   if test x"${enable_time_check}" = x"yes" -o x"${enable_time_check}" = x ; then
     AC_DEFINE(CONSUMED_TIME_CHECK,5000000,Consumed Time Check)