Don't automagically enable LTO. Users can enable that if they want via
*FLAGS.
--- a/configure.ac
+++ b/configure.ac
@@ -46,43 +46,6 @@ dnl Checks for typedefs, structures, and compiler characteristics.
 AC_STRUCT_TM
 U="`uname -s`"
 
-# LTO fails on Solaris for some reason
-if test "$U" != "SunOS" -a "$GCC" = yes; then
-   	CFLAGS="$CFLAGS -Wall -Wextra -Wstrict-prototypes"
-        # Check for link-time optimization support
-        OLDCFLAGS="$CFLAGS"
-        CFLAGS="$CFLAGS -flto=auto"
-        AC_MSG_CHECKING([whether $CC supports -flto=auto])
-        AC_LINK_IFELSE(
-            [AC_LANG_PROGRAM(
-               [[int x = 1;]],
-               [[]])],
-               [lto=yes],
-               [lto=no]
-               )
-        AC_MSG_RESULT([$lto])
-        if test "x$lto" != "xyes" ; then
-	    CFLAGS="$OLDCFLAGS"
-        else
-            AC_MSG_CHECKING([whether $CC supports -ffat-lto-object])
-            OLDCFLAGS="$CFLAGS"
-            CFLAGS="$CFLAGS -Werror -ffat-lto-objects"
-            AC_LINK_IFELSE(
-                [AC_LANG_PROGRAM(
-                    [[int x = 1;]],
-                    [[]])],
-                [lto=yes],
-                [lto=no]
-                )
-            AC_MSG_RESULT([$lto])
-            if test "x$lto" != "xyes" ; then
-                CFLAGS="$OLDCFLAGS"
-            else
-                CFLAGS="$OLDCFLAGS -ffat-lto-objects"
-            fi
-        fi
-fi
-
 dnl If sizeof(time_t) is 4, try to get 64-bit time_t
 if test "$ac_cv_sizeof_time_t" = "4" ; then
     AC_MSG_NOTICE([time_t is 32-bits on this system; attempting to use 64-bit time_t])