Segmentation fault in df-scan.c

[Hans-Peter Nilsson]

On Sun, 20 Jan 2008, Kenneth Zadeck wrote:
> If you
> build your compiler with --enable-checking=df,yes (basically add "df"
> onto what ever you normally set for --enable-checking) it will check that
> there have been no unauthorized changes to any instructions after
> every rtl pass.

For the record, the options above are in the wrong order; it's
significant.  To add "df" to the default, you need to make that
"--enable-checking=yes,df" where "yes" represents the default
flags for checking.  See gcc/configure.ac.  When desperate, try
"all"! ;)

(Or perhaps --enable-checking=all,valgrind, since valgrind is
exempted from "all" probably because it requires an external
package.)

brgds, H-P