Having to answer questions about my C-compiler isn't always that easy. Sometimes you need to find include files, for which you don't know if and if how they are used. Sometimes you need to compile test programs to see the behaviour, and then there is threads, 32/64 bitness etc. I was recently pointed to http://www.math.utah.edu/pub/features/ Which gives a nice summary of what your C/C++ compiler behaves like. Here's the output for HP C-ANSI-C on HP-UX 11.23/64 IPF and on 11.00 ======================================================================== HP-UX 11.23/64 U rx1620/64 Itanium 2/1600(2) ia64 2037 Mb B9007AA.C-ANSI-C C.06.15 HP C/aC++ Compiler Compiler = cc Available standard predefined constant macros... __DATE__ = "Feb 11 2008" __FILE__ = "features.c" __LINE__ = 180 __STDC__ = 1 __STDC_VERSION__ = 199012 __TIME__ = "08:50:58" Missing standard predefined constant macros... __bool_true_false_are_defined __cplusplus __func__ __STDC_HOSTED__ __STDC_IEC_559__ __STDC_IEC_559_COMPLEX__ __STDC_ISO_10646__ __STDC_CONSTANT_MACROS __STDC_FORMAT_MACROS __STDC_LIMIT_MACROS Available nonstandard but traditional header files... <sys/types.h> <varargs.h> Missing nonstandard but traditional header files... Available 1989 Standard C header files... <assert.h> <ctype.h> <errno.h> <float.h> <limits.h> <locale.h> <math.h> <setjmp.h> <signal.h> <stdarg.h> <stddef.h> <stdio.h> <stdlib.h> <string.h> <time.h> Missing 1989 Standard C standard header files... Available additional 1999 Standard C header files... <complex.h> <fenv.h> <inttypes.h> <iso646.h> <stdbool.h> <stdint.h> <tgmath.h> <wchar.h> <wctype.h> Missing additional 1999 Standard C standard header files... Available additional POSIX (IEEE Std 1003.1-2001) header files... <aio.h> <arpa/inet.h> <cpio.h> <dirent.h> <dlfcn.h> <fcntl.h> <fmtmsg.h> <fnmatch.h> <ftw.h> <glob.h> <grp.h> <iconv.h> <langinfo.h> <libgen.h> <monetary.h> <mqueue.h> <ndbm.h> <net/if.h> <netdb.h> <netinet/in.h> <netinet/tcp.h> <nl_types.h> <poll.h> <pthread.h> <pwd.h> <regex.h> <sched.h> <search.h> <semaphore.h> <strings.h> <stropts.h> <sys/ipc.h> <sys/mman.h> <sys/msg.h> <sys/resource.h> <sys/select.h> <sys/sem.h> <sys/shm.h> <sys/socket.h> <sys/stat.h> <sys/statvfs.h> <sys/time.h> <sys/timeb.h> <sys/times.h> <sys/types.h> <sys/uio.h> <sys/un.h> <sys/utsname.h> <sys/wait.h> <syslog.h> <tar.h> <termios.h> <ucontext.h> <ulimit.h> <unistd.h> <utime.h> <utmpx.h> <wordexp.h> Missing additional POSIX (IEEE Std 1003.1-2001) header files... <spawn.h> <trace.h> Pointer sizes... sizeof(char*) = 8 sizeof(void*) = 8 sizeof(void(*)(void)) = 8 Integer sizes... sizeof(char) = 1 sizeof(short) = 2 sizeof(int) = 4 sizeof(long) = 8 sizeof(long long) = 8 Integer-like sizes... sizeof(clock_t) = 4 sizeof(div_t) = 8 sizeof(fpos_t) = 8 sizeof(intmax_t) = 8 sizeof(ldiv_t) = 16 sizeof(off_t) = 8 sizeof(ptrdiff_t) = 8 sizeof(sig_atomic_t) = 4 sizeof(size_t) = 8 sizeof(time_t) = 8 sizeof(uintmax_t) = 8 sizeof(wchar_t) = 4 C++ 1998 integer-like sizes... C99 integer-like sizes... sizeof(double_t) = 8 sizeof(fenv_t) = 8 sizeof(fexcept_t) = 4 sizeof(float_t) = 4 sizeof(int8_t) = 1 sizeof(int_fast16_t) = 4 sizeof(int_fast32_t) = 4 sizeof(int_fast64_t) = 8 sizeof(int_fast8_t) = 4 sizeof(int_least16_t) = 2 sizeof(int_least32_t) = 4 sizeof(int_least64_t) = 8 sizeof(int_least8_t) = 1 sizeof(intptr_t) = 8 sizeof(ssize_t) = 8 sizeof(uint_fast16_t) = 4 sizeof(uint_fast32_t) = 4 sizeof(uint_fast64_t) = 8 sizeof(uint_fast8_t) = 4 sizeof(uint_least16_t) = 2 sizeof(uint_least32_t) = 4 sizeof(uint_least64_t) = 8 sizeof(uint_least8_t) = 1 sizeof(uintptr_t) = 8 sizeof(wchar_t) = 4 sizeof(wctype_t) = 4 sizeof(wint_t) = 4 sizeof(_Bool) = 1 Floating-point sizes... sizeof(float) = 4 sizeof(double) = 8 sizeof(long double) = 16 Missing data types... imaxdiv_t lldiv_t mbstate_t nothrow_t wctrans_t _Complex _Imaginary fpathconf() and pathconf() tests... pathconf("/", _PC_NAME_MAX) = 255 pathconf("/bin", _PC_NAME_MAX) = 255 pathconf("/etc", _PC_NAME_MAX) = 255 pathconf("/tmp", _PC_NAME_MAX) = 255 pathconf("/usr", _PC_NAME_MAX) = 255 pathconf("/var", _PC_NAME_MAX) = 255 pathconf("./", _PC_NAME_MAX) = 255 fpathconf(fileno(stdin), _PC_NAME_MAX) = -1 fpathconf(fileno(stdout), _PC_NAME_MAX) = -1 fpathconf(fileno(stderr), _PC_NAME_MAX) = -1 pathconf("/", _PC_PATH_MAX) = 1023 pathconf("/bin", _PC_PATH_MAX) = 1023 pathconf("/etc", _PC_PATH_MAX) = 1023 pathconf("/tmp", _PC_PATH_MAX) = 1023 pathconf("/usr", _PC_PATH_MAX) = 1023 pathconf("/var", _PC_PATH_MAX) = 1023 pathconf("./", _PC_PATH_MAX) = 1023 fpathconf(fileno(stdin), _PC_PATH_MAX) = -1 fpathconf(fileno(stdout), _PC_PATH_MAX) = -1 fpathconf(fileno(stderr), _PC_PATH_MAX) = -1 float limits: smallest floating-point number: 1.40129846e-45 == 2^(-149) [IEEE 754 smallest 32-bit subnormal] machine epsilon: 1.19209290e-07 == 2^(-23) [IEEE 754 32-bit conformant] double limits: smallest floating-point number: 4.94065646e-324 == 2^(-1074) [IEEE 754 smallest 64-bit subnormal] machine epsilon: 2.22044605e-16 == 2^(-52) [IEEE 754 64-bit conformant] long double limits: smallest floating-point number: 0.00000000e+00 == 2^(-16494) [IEEE 754 smallest 128-bit subnormal] machine epsilon: 1.92592994e-34 == 2^(-112) [IEEE 754 128-bit conformant] long double appears to be 128-bit value stored in 128-bit (16-byte) field FEATURES TESTS COMPLETED ======================================================================== HP-UX 11.00/64 U A500-7X/64 PA8700/750(2) pa-2.0 2048 Mb B3901BA.C-ANSI-C B.11.11.10 HP C/ANSI C Compiler Compiler = cc Available standard predefined constant macros... __bool_true_false_are_defined = 1 __DATE__ = "Feb 11 2008" __FILE__ = "features.c" __LINE__ = 180 __STDC__ = 1 __TIME__ = "09:01:55" Missing standard predefined constant macros... __cplusplus __func__ __STDC_HOSTED__ __STDC_IEC_559__ __STDC_IEC_559_COMPLEX__ __STDC_ISO_10646__ __STDC_CONSTANT_MACROS __STDC_FORMAT_MACROS __STDC_LIMIT_MACROS __STDC_VERSION__ Available nonstandard but traditional header files... <sys/types.h> <varargs.h> Missing nonstandard but traditional header files... Available 1989 Standard C header files... <assert.h> <ctype.h> <errno.h> <float.h> <limits.h> <locale.h> <math.h> <setjmp.h> <signal.h> <stdarg.h> <stddef.h> <stdio.h> <stdlib.h> <string.h> <time.h> Missing 1989 Standard C standard header files... Available additional 1999 Standard C header files... <fenv.h> <inttypes.h> <stdbool.h> <wchar.h> Missing additional 1999 Standard C standard header files... <complex.h> <iso646.h> <stdint.h> <tgmath.h> <wctype.h> Available additional POSIX (IEEE Std 1003.1-2001) header files... <aio.h> <arpa/inet.h> <cpio.h> <dirent.h> <dlfcn.h> <fcntl.h> <fmtmsg.h> <fnmatch.h> <ftw.h> <glob.h> <grp.h> <iconv.h> <langinfo.h> <libgen.h> <monetary.h> <mqueue.h> <ndbm.h> <net/if.h> <netdb.h> <netinet/in.h> <netinet/tcp.h> <nl_types.h> <poll.h> <pthread.h> <pwd.h> <regex.h> <sched.h> <search.h> <semaphore.h> <strings.h> <stropts.h> <sys/ipc.h> <sys/mman.h> <sys/msg.h> <sys/resource.h> <sys/sem.h> <sys/shm.h> <sys/socket.h> <sys/stat.h> <sys/statvfs.h> <sys/time.h> <sys/timeb.h> <sys/times.h> <sys/types.h> <sys/uio.h> <sys/un.h> <sys/utsname.h> <sys/wait.h> <syslog.h> <tar.h> <termios.h> <ucontext.h> <ulimit.h> <unistd.h> <utime.h> <utmpx.h> <wordexp.h> Missing additional POSIX (IEEE Std 1003.1-2001) header files... <spawn.h> <sys/select.h> <trace.h> Pointer sizes... sizeof(char*) = 4 sizeof(void*) = 4 sizeof(void(*)(void)) = 4 Integer sizes... sizeof(char) = 1 sizeof(short) = 2 sizeof(int) = 4 sizeof(long) = 4 sizeof(long long) = 8 Integer-like sizes... sizeof(clock_t) = 4 sizeof(div_t) = 8 sizeof(fpos_t) = 4 sizeof(intmax_t) = 8 sizeof(ldiv_t) = 8 sizeof(off_t) = 4 sizeof(ptrdiff_t) = 4 sizeof(sig_atomic_t) = 4 sizeof(size_t) = 4 sizeof(time_t) = 4 sizeof(uintmax_t) = 8 sizeof(wchar_t) = 4 C++ 1998 integer-like sizes... C99 integer-like sizes... sizeof(double_t) = 8 sizeof(fenv_t) = 4 sizeof(fexcept_t) = 4 sizeof(float_t) = 4 sizeof(int8_t) = 1 sizeof(int_fast16_t) = 4 sizeof(int_fast32_t) = 4 sizeof(int_fast64_t) = 8 sizeof(int_fast8_t) = 4 sizeof(int_least16_t) = 2 sizeof(int_least32_t) = 4 sizeof(int_least64_t) = 8 sizeof(int_least8_t) = 1 sizeof(intptr_t) = 4 sizeof(ssize_t) = 4 sizeof(uint_fast16_t) = 4 sizeof(uint_fast32_t) = 4 sizeof(uint_fast64_t) = 8 sizeof(uint_fast8_t) = 4 sizeof(uint_least16_t) = 2 sizeof(uint_least32_t) = 4 sizeof(uint_least64_t) = 8 sizeof(uint_least8_t) = 1 sizeof(uintptr_t) = 4 sizeof(wchar_t) = 4 sizeof(wctype_t) = 4 sizeof(wint_t) = 4 sizeof(_Bool) = 1 Floating-point sizes... sizeof(float) = 4 sizeof(double) = 8 sizeof(long double) = 16 Missing data types... imaxdiv_t lldiv_t mbstate_t nothrow_t wctrans_t _Complex _Imaginary fpathconf() and pathconf() tests... pathconf("/", _PC_NAME_MAX) = 255 pathconf("/bin", _PC_NAME_MAX) = 255 pathconf("/etc", _PC_NAME_MAX) = 255 pathconf("/tmp", _PC_NAME_MAX) = 255 pathconf("/usr", _PC_NAME_MAX) = 255 pathconf("/var", _PC_NAME_MAX) = 255 pathconf("./", _PC_NAME_MAX) = 255 fpathconf(fileno(stdin), _PC_NAME_MAX) = -1 fpathconf(fileno(stdout), _PC_NAME_MAX) = -1 fpathconf(fileno(stderr), _PC_NAME_MAX) = -1 pathconf("/", _PC_PATH_MAX) = 1023 pathconf("/bin", _PC_PATH_MAX) = 1023 pathconf("/etc", _PC_PATH_MAX) = 1023 pathconf("/tmp", _PC_PATH_MAX) = 1023 pathconf("/usr", _PC_PATH_MAX) = 1023 pathconf("/var", _PC_PATH_MAX) = 1023 pathconf("./", _PC_PATH_MAX) = 1023 fpathconf(fileno(stdin), _PC_PATH_MAX) = -1 fpathconf(fileno(stdout), _PC_PATH_MAX) = -1 fpathconf(fileno(stderr), _PC_PATH_MAX) = -1 float limits: smallest floating-point number: 1.40129846e-45 == 2^(-149) [IEEE 754 smallest 32-bit subnormal] machine epsilon: 1.19209290e-07 == 2^(-23) [IEEE 754 32-bit conformant] double limits: smallest floating-point number: 4.94065646e-324 == 2^(-1074) [IEEE 754 smallest 64-bit subnormal] machine epsilon: 2.22044605e-16 == 2^(-52) [IEEE 754 64-bit conformant] long double limits: smallest floating-point number: 0.00000000e+00 == 2^(-16494) [IEEE 754 smallest 128-bit subnormal] machine epsilon: 1.92592994e-34 == 2^(-112) [IEEE 754 128-bit conformant] long double appears to be 128-bit value stored in 128-bit (16-byte) field FEATURES TESTS COMPLETED -- H.Merijn Brand Amsterdam Perl Mongers (http://amsterdam.pm.org/) using & porting perl 5.6.2, 5.8.x, 5.10.x on HP-UX 10.20, 11.00, 11.11, & 11.23, SuSE 10.1 & 10.2, AIX 5.2, and Cygwin. http://qa.perl.org http://mirrors.develooper.com/hpux/ http://www.test-smoke.org http://www.goldmark.org/jeff/stupid-disclaimers/ - To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
