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Date: Thu, 05 Nov 2009 03:45:38 -0600
From: "Yaakov (Cygwin/X)" <yselkowitz AT users DOT sourceforge DOT net>
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Subject: malloc overrides
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GraphViz uses iffe tests to determine system capabilities.  Two tests, 
however, hang and require manual intervention to kill them and continue. 
  These are the culprits:

####### start code 1 #######

/* Are we stuck with standard malloc? */

extern void _exit (int);
extern char* strdup (const char*);

char* malloc(unsigned n) {
     _exit(0);
     return 0;
}

int main(void) {
     strdup("yo");
     _exit(1);
}

####### end code 1 #######

####### start code 2 #######

/* Is alloca is based on malloc()? */

#include <alloca.h>

void* malloc(unsigned int size) {
     exit(0);
     return 0;
}

int main(void) {
     alloca(10);
     return 1;
}

####### end code 1 #######

In both cases, the program hangs and needs to be forcefully killed 
through Windows' taskmgr.  On Linux, these run quickly and return 0 and 
1, respectively.

Is this a problem with the code, or is this a bug or limitation in Cygwin?


Yaakov


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