[Valgrind-users] Re: Recommended gcc version

[Melchior F. <mf...@kd...>]

* Leonard mckinley -- Tuesday 10 June 2003 00:05:
> Pulled CVS today and I'm getting 10s of thousands of Mismatched free
> errors that aren't mismatched, a known issue reported earlier in the
> archives.

I can confirm that cvs/head gives hundreds of bogus error messages
about mismatched allocation. I only checked one of them and saw that
the concerned code creates an automatic variable of a c++ object.
valgrind obviously complains when the auto var is to be destroyed
at function end. The bug was introduced with "vg_replace_malloc.c"
revision 1.7. (1.6 did still work.)

Example error message from debugging FlightGear/gcc 3.2/Linux 2.4.21-pre6:

==10706== Mismatched free() / delete / delete []
==10706==    at 0x400263EC: __builtin_vec_delete (vg_replace_malloc.c:252)
==10706==    by 0x4002640C: operator delete[](void*) (vg_replace_malloc.c:261)
==10706==    by 0x8491E79: ulRTTITypeinfo::ulRTTITypeinfo(char const*, ulRTTITypeinfo const**, void* (*)(int, void*), void* (*)()) (ulRTTI.cxx:50)
==10706==    Address 0x42B4EA2C is 0 bytes inside a block of size 4 alloc'd
==10706==    at 0x40026020: malloc (vg_replace_malloc.c:153)
==10706==    by 0x4033789D: operator new(unsigned) (in /usr/lib/libGLU.so.1.3)
==10706==    by 0x403379FE: operator new[](unsigned) (in /usr/lib/libGLU.so.1.3)
==10706==    by 0x8491E34: ulRTTITypeinfo::ulRTTITypeinfo(char const*, ulRTTITypeinfo const**, void* (*)(int, void*), void* (*)()) (ulRTTI.cxx:67)




And then: line 123 in configure.in from cvs/head causes the
following error when running ./autogen.sh:

  running: autoconf
  configure.in:123: error: possibly undefined macro: AC_PROG_EGREP
  error: while running 'autoconf'

Commenting this check out makes ./autogen.sh work. The funny thing
is, that if I run autoconf manually, then I do neither get a complaint
about AC_PROG_EGREP, nor an error return value.  (WTF??)

m.



PS: I didn't mean to be ungrateful when I complained about my joystick
    patch being ignored for a month. I =am= grateful for that wonderful
    tool and all your work on it!   :-)