GCC now supports providing the header <stdint.h> (required by C99 of freestanding implementations) and having information within the compiler about the types used in this header. For further discussion of this and its benefits, see <http://gcc.gnu.org/ml/gcc-patches/2008-11/msg00305.html>.
Right now, the information is present in GCC for targets using glibc or uClibc, bare-metal and RTEMS targets (which are taken to use newlib's default stdint.h types) and Solaris targets. To get the full benefits of this support, the information needs adding for all OSes supported by GCC. This is information about all the types C99 specifies for <stdint.h>, plus sig_atomic_t whose limits go in that header. To add information for a target OS, put definitions such as those in glibc-stdint.h, newlib-stdint.h or sol2.h in a suitable target header, and set use_gcc_stdint in config.gcc. It should be set to "wrap" if the system has its own stdint.h header, or "provide" if it doesn't. (There might be special cases when some other arrangement is needed, but I expect those two generally to suffice.) Make sure the new c99-stdint-*.c tests pass; if they show up bugs in the system's stdint.h header (as wrapped by GCC with the "wrap" setting) then report those upstream and fix them in GCC with fixincludes. If the system does not have stdint.h, then suitable types may be found in one of the following places: * A later OS version. * inttypes.h (some systems have headers from C9x drafts that had only inttypes.h and not stdint.h). * Other headers such as sys/types.h, including possibly variant type names such as u_int32_t in those headers. * As a last resort, for OSes that are no longer maintained or whose maintainers have had no interest in defining those types for the OS, the types may be invented for GCC. At least the following OSes need the information added (for all supported architectures): * Darwin * FreeBSD * NetBSD * OpenBSD * VxWorks * alpha*-dec-osf[45]* * VMS * SymbianOS * WinCE * HP-UX * DJGPP * LynxOS * Netware * QNX * Cygwin * MinGW * Interix * IRIX * AIX * s390x-ibm-tpf* -- Joseph S. Myers jos...@codesourcery.com
