Using and Porting the GNU Compiler Collection (GCC)
GCC by itself attempts to be what the ISO/ANSI C standard calls a
conforming freestanding implementation. This means all ANSI
C language features are available, as well as the contents of
`float.h', `limits.h', `stdarg.h', and
`stddef.h'. The rest of the C library is supplied by the
vendor of the operating system. If that C library doesn't conform to
the C standards, then your programs might get warnings (especially when
using `-Wall') that you don't expect.
For example, the sprintf function on SunOS 4.1.3 returns
char * while the C standard says that sprintf returns an
int. The fixincludes program could make the prototype for
this function match the Standard, but that would be wrong, since the
function will still return char *.
If you need a Standard compliant library, then you need to find one, as
GCC does not provide one. The GNU C library (called glibc)
has been ported to a number of operating systems, and provides ANSI/ISO,
POSIX, BSD and SystemV compatibility. You could also ask your operating
system vendor if newer libraries are available.
Using and Porting the GNU Compiler Collection (GCC)
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