Package: tcc
Version: 0.9.23-1
Severity: normal
Tcc doesn't correctly implement casts from floating point types to _Bool.
According to C99, such casts must return true for all numbers except 0:
When any scalar value is converted to _Bool, the result is 0 if the value
compares equal to 0; otherwise, the result is 1.
This means that (_Bool) 0.1 must be 1; with tcc it's 0. The following
trivial program can be used to test this:
#include <stdio.h>
int
main (void)
{
printf ("%d\n", (_Bool) 0.1);
return 0;
}
The program prints 1 under Gcc (and other C99-compliant compilers I tested
it with, such as Sun's cc) and 0 under Tcc. I know that Tcc doesn't aim for
C99 conformance, but it's confusing that it implements the _Bool type which
comes from C99, but not the associated semantics.
-- System Information:
Debian Release: testing/unstable
APT prefers testing
APT policy: (500, 'testing')
Architecture: i386 (i686)
Shell: /bin/sh linked to /bin/bash
Kernel: Linux 2.6.11-1-686
Locale: LANG=en_US, LC_CTYPE=en_US (charmap=ISO-8859-1)
Versions of packages tcc depends on:
ii libc6 2.3.2.ds1-22 GNU C Library: Shared libraries an
Versions of packages tcc recommends:
ii libc6-dev [libc-dev] 2.3.2.ds1-22 GNU C Library: Development Librari
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