configure.ac: Only compile with -fPIC if the target supports it.

	* configure.ac: Only compile with -fPIC if the target
	supports it.
	* configure: Regenerate.

From-SVN: r227203

libbacktrace/ChangeLog

+2015-08-26  Hans-Peter Nilsson  <hp@axis.com>
+
+	* configure.ac: Only compile with -fPIC if the target
+	supports it.
+	* configure: Regenerate.
+
 2015-08-24  Ulrich Weigand  <Ulrich.Weigand@de.ibm.com>
 
 	* configure.ac: Set have_mmap to no on spu-*-* targets.

libbacktrace/configure

@@ -11710,11 +11710,29 @@ fi
 
 # When building as a target library, shared libraries may want to link
 # this in.  We don't want to provide another shared library to
-# complicate dependencies.  Instead, we just compile with -fPIC.
+# complicate dependencies.  Instead, we just compile with -fPIC, if
+# the target supports compiling with that option.
 PIC_FLAG=
 if test -n "${with_target_subdir}"; then
+  ac_save_CFLAGS="$CFLAGS"
+  CFLAGS="$CFLAGS -fPIC"
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
   PIC_FLAG=-fPIC
 fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+  CFLAGS="$ac_save_CFLAGS"
+fi
 # Similarly, use -fPIC with --enable-host-shared:
 # Check whether --enable-host-shared was given.
 if test "${enable_host_shared+set}" = set; then :

libbacktrace/configure.ac

@@ -163,10 +163,14 @@ fi
 
 # When building as a target library, shared libraries may want to link
 # this in.  We don't want to provide another shared library to
-# complicate dependencies.  Instead, we just compile with -fPIC.
+# complicate dependencies.  Instead, we just compile with -fPIC, if
+# the target supports compiling with that option.
 PIC_FLAG=
 if test -n "${with_target_subdir}"; then
-  PIC_FLAG=-fPIC
+  ac_save_CFLAGS="$CFLAGS"
+  CFLAGS="$CFLAGS -fPIC"
+  AC_TRY_COMPILE([], [], [PIC_FLAG=-fPIC])
+  CFLAGS="$ac_save_CFLAGS"
 fi
 # Similarly, use -fPIC with --enable-host-shared:
 AC_ARG_ENABLE(host-shared,