Possibly a bug

Possibly a bug

[Abdul Wahid Memon]

Hello everyone

I am sorry if this question doesn't relates to the bugs mailing list
but I think its a bug.

I posted a question on gcc-help but didn't got a useful answer yet. I
am using plugin with gcc-4.5.3.

The plugin just uses a simple number_of_loops() function. Plugin
defines 2 passes (one at GIMPEL level and the other at RTL).

GIMPLE Pass goes smoothly but at RTL, I receive an error concerning dominance.c

hello.c: In function ‘main’:
hello.c:13:1: internal compiler error: in calc_dfs_tree, at dominance.c:394
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

There are 2 functions in hello.c. Things are fine if main function
call another function (in this case called function doesn't return any
value) but
if I modify the function to return some value then I get the above
error but only in RTL pass.

Re: Possibly a bug

[Eric Botcazou]

> hello.c: In function ‘main’:
> hello.c:13:1: internal compiler error: in calc_dfs_tree, at dominance.c:394
> Please submit a full bug report,
> with preprocessed source if appropriate.
> See <http://gcc.gnu.org/bugs.html> for instructions.

This error means that some basic blocks are unreachable in the CFG.  The CFG 
needs to be cleaned up before that point.

-- 
Eric Botcazou