[Tinycc-devel] unbounded recursion and crash on invalid nested union declaration

[Pascal Cuoq]

Hello,

On the following (invalid) C program, tcc goes into an unbounded recursion, and crashes when it exhausts the space allowed for the stack. I tried to make a valid C program with the same property, which would be a more interesting bug report, but I couldn't find one.

Pascal

________

$ cat cr.i

union u {

  union u { };

};

$ gcc -c cr.i

cr.i:2:9: error: nested redefinition of 'union u'

   union u { };

         ^

cr.i:2:14: warning: declaration does not declare anything

   union u { };

              ^

$ clang -c cr.i

cr.i:2:9: error: nested redefinition of 'u'

  union u { };

        ^

cr.i:1:7: note: previous definition is here

union u {

      ^

1 error generated.

$ ./tcc -c cr.i

Segmentation fault

$