[configure] Print compiler version info in report
diff --git a/configure.ac b/configure.ac
index b7827a6..10636e7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -58,6 +58,9 @@
HB_LIBTOOL_VERSION_INFO=hb_libtool_current:hb_libtool_revision:hb_libtool_age
AC_SUBST(HB_LIBTOOL_VERSION_INFO)
+cxx_version=`$CXX --version`
+AC_SUBST(cxx_version)
+
AC_ARG_WITH([libstdc++],
[AS_HELP_STRING([--with-libstdc++=@<:@yes/no@:>@],
[Allow linking with libstdc++ @<:@default=no@:>@])],
@@ -519,6 +522,9 @@
Build configuration:
+C++ compiler version:
+${cxx_version}
+
Unicode callbacks (you want at least one):
Builtin (UCDN): ${have_ucdn}
Glib: ${have_glib}
