Hi, TinyCC fails to test on i386 on the CI that I just set up. Apparently, though, the problem is not in tcc, but in gcc, which is used to compile the test program too and compare the results.
I managed to trim down the offending example to this:
int main() {
asm volatile ("mov %%eax, %%eax\n" : : "i" ("A string"));
return 0;
}
If I compile this with gcc (9.2) on Debian this happens:
$ gcc -g -m32 test.c
test.c: In function ‘main’:
test.c:3:5: warning: asm operand 0 probably doesn’t match constraints
3 | asm volatile ("mov %%eax, %%eax\n" : : "i" ("A string"));
| ^~~
test.c:3:5: error: impossible constraint in ‘asm’
I believe this is wrong, "i" should accept a literal string as value.
Also, the same program works on Compiler Explorer[1].
[1] https://godbolt.org/z/xAP-dy
I suspect this might be a bug in Debian's gcc. Anybody not using Debian
could please try to compile this program and see what happens?
Thanks, Giovanni.
--
Giovanni Mascellani <g.mascell...@gmail.com>
Postdoc researcher - Université Libre de Bruxelles
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