[PD-dev] Externals with interdependancies

[Mathieu Bouchard]

On Mon, 23 Mar 2009, Mike McGonagle wrote:

> Any suggestions about the "consistency check" issue? The only
> reference I see to them in the Pd source is in the 's_print.c' file,
> but that is just the function that gets called to report the error.

It could be any function that calls the bug() function. Here are three 
ways of finding causes:

1. #define bug(A,B...) bug("%s:%d:"A,__FILE__,__LINE__,B) and recompile 
Pd. This will cause every call to bug() to also report the file and line 
number where it was called from. You do it in <m_pd.h> but you need to 
#undef it where it is defined so that the function can be defined without 
a parse error.

2. Use a debugger. In gdb, type "break bug" before you type "run". This 
will make the programme pause at every call to bug(). Then use "where" to 
get a backtrace.

3. Edit the bug() definition so that it posts a stacktrace as well. This 
is OS-specific. In Linux, use the backtrace() and backtrace_symbols() 
functions from <execinfo.h>.

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| Mathieu Bouchard - tél:+1.514.383.3801, Montréal, Québec