[Tinycc-devel] problem with -b option and ternary operator

[Somchai Smythe]

Hello tinycc-devel list,

Using 330c01bfc6fa6721fd455911a966bce041df31d8 version of tcc, I hit a
bug while trying to compile stuff using the '-b' option.  Here is a
reduced test case:

------8< cut here 8<-------
// reduced test case for -b bug with ternary operator
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

struct token {
  char *toketext;
};

struct tree_node {
  struct token *leaftoken;
};

int main(void) {
 struct tree_node *node=(struct tree_node *)malloc(sizeof(struct tree_node));

 node->leaftoken=(struct token *)malloc(sizeof(struct token));
 node->leaftoken->toketext=strdup("whatever");
 // the ternary operator will cause
 // 'error: unhandled size when dereferencing bounded pointer'
 // when you compile with tcc and '-b' option
 // true even for 330c01bfc6fa6721fd455911a966bce041df31d8
 // set argument to if to 1 to see error, set it to 0 to see pass
#if 1
 fprintf(stderr, "data->leaftoken->toketext = '%s'\n",
         !(node->leaftoken->toketext) ? "null" : node->leaftoken->toketext);
#else
 // but this works
 fprintf(stderr, "data->leaftoken->toketext = '%s'\n",
         node->leaftoken->toketext ? node->leaftoken->toketext : "null");
#endif
  return EXIT_SUCCESS;
}
------8< cut here 8<-------

When compiled without '-b' option, both ways to do it run and work fine.