configure.ac: Abort attempts to cross build in source

diff --git a/configure.ac b/configure.ac
index d98631fcfcd08b184d6c223db679684d90ef1936..d68d1bf5f8922e101aab62edd1a5b046448f5c8e 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -28,6 +28,12 @@ dnl Checks for programs.
 AC_GNU_SOURCE
 AC_PROG_CC
 gl_EARLY
+if test x"$cross_compiling" = x"yes"; then
+   if test x"$srcdir" = x"."; then
+      AC_ERROR([Cross compiling must be done out of source.])
+   fi
+fi
+
 AM_PROG_CC_C_O
 AC_LIBTOOL_WIN32_DLL
 AC_LIBTOOL_DLOPEN