tests: add signature checks These tests will help catch problems similar to the one recently fixed for cygwin declaring getsubopt and symlinkat in the wrong header. * tests/signature.h (SIGNATURE_CHECK): New file. * modules/atexit-tests (Files): Use it. * modules/btowc-tests (Files): Likewise. * modules/canonicalize-lgpl-tests (Files): Likewise. * modules/ceilf-tests (Files): Likewise. * modules/ceill-tests (Files): Likewise. * modules/chown-tests (Files): Likewise. * modules/dprintf-posix-tests (Files): Likewise. * modules/dup2-tests (Files): Likewise. * modules/dup3-tests (Files): Likewise. * modules/duplocale-tests (Files): Likewise. * modules/fchdir-tests (Files): Likewise. * modules/fcntl-tests (Files): Likewise. * modules/fdopendir-tests (Files): Likewise. * modules/fflush-tests (Files): Likewise. * modules/flock-tests (Files): Likewise. * modules/floorf-tests (Files): Likewise. * modules/floorl-tests (Files): Likewise. * modules/fnmatch-tests (Files): Likewise. * modules/fopen-tests (Files): Likewise. * modules/fprintf-posix-tests (Files): Likewise. * modules/freopen-tests (Files): Likewise. * modules/frexp-nolibm-tests (Files): Likewise. * modules/frexp-tests (Files): Likewise. * modules/frexpl-nolibm-tests (Files): Likewise. * modules/frexpl-tests (Files): Likewise. * modules/fseek-tests (Files): Likewise. * modules/fseeko-tests (Files): Likewise. * modules/fsync-tests (Files): Likewise. * modules/ftell-tests (Files): Likewise. * modules/ftello-tests (Files): Likewise. * modules/futimens-tests (Files): Likewise. * modules/getaddrinfo-tests (Files): Likewise. * modules/getcwd-tests (Files): Likewise. * modules/getdelim-tests (Files): Likewise. * modules/getdtablesize-tests (Files): Likewise. * modules/getgroups-tests (Files): Likewise. * modules/gethostname-tests (Files): Likewise. * modules/getline-tests (Files): Likewise. * modules/getopt-posix-tests (Files): Likewise. * modules/gettimeofday-tests (Files): Likewise. * modules/glob-tests (Files): Likewise. * modules/iconv-tests (Files): Likewise. * modules/inet_ntop-tests (Files): Likewise. * modules/inet_pton-tests (Files): Likewise. * modules/isblank-tests (Files): Likewise. * modules/lchown-tests (Files): Likewise. * modules/ldexpl-tests (Files): Likewise. * modules/link-tests (Files): Likewise. * modules/linkat-tests (Files): Likewise. * modules/lseek-tests (Files): Likewise. * modules/lstat-tests (Files): Likewise. * modules/mbrtowc-tests (Files): Likewise. * modules/mbsinit-tests (Files): Likewise. * modules/mbsnrtowcs-tests (Files): Likewise. * modules/mbsrtowcs-tests (Files): Likewise. * modules/memchr-tests (Files): Likewise. * modules/memcmp-tests (Files): Likewise. * modules/memmem-tests (Files): Likewise. * modules/memrchr-tests (Files): Likewise. * modules/mkdir-tests (Files): Likewise. * modules/mkfifo-tests (Files): Likewise. * modules/mkfifoat-tests (Files): Likewise. * modules/mknod-tests (Files): Likewise. * modules/nanosleep-tests (Files): Likewise. * modules/nl_langinfo-tests (Files): Likewise. * modules/obstack-printf-tests (Files): Likewise. * modules/open-tests (Files): Likewise. * modules/openat-tests (Files): Likewise. * modules/perror-tests (Files): Likewise. * modules/pipe2-tests (Files): Likewise. * modules/poll-tests (Files): Likewise. * modules/popen-tests (Files): Likewise. * modules/posix_spawn-tests (Files): Likewise. * modules/posix_spawnp-tests (Files): Likewise. * modules/pread-tests (Files): Likewise. * modules/printf-posix-tests (Files): Likewise. * modules/pty-tests (Files): Likewise. * modules/random_r-tests (Files): Likewise. * modules/rawmemchr-tests (Files): Likewise. * modules/readlink-tests (Files): Likewise. * modules/remove-tests (Files): Likewise. * modules/rename-tests (Files): Likewise. * modules/renameat-tests (Files): Likewise. * modules/rmdir-tests (Files): Likewise. * modules/round-tests (Files): Likewise. * modules/roundf-tests (Files): Likewise. * modules/roundl-tests (Files): Likewise. * modules/select-tests (Files): Likewise. * modules/setenv-tests (Files): Likewise. * modules/sigaction-tests (Files): Likewise. * modules/sleep-tests (Files): Likewise. * modules/snprintf-posix-tests (Files): Likewise. * modules/snprintf-tests (Files): Likewise. * modules/sprintf-posix-tests (Files): Likewise. * modules/stat-tests (Files): Likewise. * modules/strcasestr-tests (Files): Likewise. * modules/strchrnul-tests (Files): Likewise. * modules/strerror-tests (Files): Likewise. * modules/strsignal-tests (Files): Likewise. * modules/strstr-tests (Files): Likewise. * modules/strtod-tests (Files): Likewise. * modules/strverscmp-tests (Files): Likewise. * modules/symlink-tests (Files): Likewise. * modules/symlinkat-tests (Files): Likewise. * modules/times-tests (Files): Likewise. * modules/trunc-tests (Files): Likewise. * modules/truncf-tests (Files): Likewise. * modules/truncl-tests (Files): Likewise. * modules/tsearch-tests (Files): Likewise. * modules/uname-tests (Files): Likewise. * modules/unlink-tests (Files): Likewise. * modules/unsetenv-tests (Files): Likewise. * modules/usleep-tests (Files): Likewise. * modules/utimensat-tests (Files): Likewise. * modules/vasprintf-tests (Files): Likewise. * modules/vdprintf-posix-tests (Files): Likewise. * modules/vfprintf-posix-tests (Files): Likewise. * modules/vprintf-posix-tests (Files): Likewise. * modules/vsnprintf-posix-tests (Files): Likewise. * modules/vsnprintf-tests (Files): Likewise. * modules/vsprintf-posix-tests (Files): Likewise. * modules/wcrtomb-tests (Files): Likewise. * modules/wcsnrtombs-tests (Files): Likewise. * modules/wcsrtombs-tests (Files): Likewise. * modules/wcwidth-tests (Files): Likewise. * tests/test-isfinite.c (isfinite): Ensure macro declaration. * tests/test-isinf.c (isinf): Likewise. * tests/test-isnan.c (isnan): Likewise. * tests/test-signbit.c (signbit): Likewise. * tests/test-select.c (FD_CLR, FD_ISSET, FD_SET, FD_ZERO): Ensure declaration, either as macro or with correct signature. (select): Ensure function under test is declared with correct signature in correct header. * tests/test-atexit.c (atexit): Likewise. * tests/test-btowc.c (btowc): Likewise. * tests/test-canonicalize-lgpl.c (realpath) (canonicalize_file_name): Likewise. * tests/test-ceilf1.c (ceilf): Likewise. * tests/test-ceill.c (ceill): Likewise. * tests/test-chown.c (chown): Likewise. * tests/test-dprintf-posix.c (dprintf): Likewise. * tests/test-dup2.c (dup2): Likewise. * tests/test-dup3.c (dup3): Likewise. * tests/test-duplocale.c (duplocale): Likewise. * tests/test-fchdir.c (fchdir): Likewise. * tests/test-fchownat.c (fchownat): Likewise. * tests/test-fcntl.c (fcntl): Likewise. * tests/test-fdopendir.c (fdopendir): Likewise. * tests/test-fflush.c (fflush): Likewise. * tests/test-flock.c (flock): Likewise. * tests/test-floorf1.c (floorf): Likewise. * tests/test-floorl.c (floorl): Likewise. * tests/test-fnmatch.c (fnmatch): Likewise. * tests/test-fopen.c (fopen): Likewise. * tests/test-fprintf-posix.c (fprintf): Likewise. * tests/test-freopen.c (freopen): Likewise. * tests/test-frexp.c (frexp): Likewise. * tests/test-frexpl.c (frexpl): Likewise. * tests/test-fseek.c (fseek): Likewise. * tests/test-fseeko.c (fseeko): Likewise. * tests/test-fstatat.c (fstatat): Likewise. * tests/test-fsync.c (fsync): Likewise. * tests/test-ftell.c (ftell): Likewise. * tests/test-ftello.c (ftello): Likewise. * tests/test-futimens.c (futimens): Likewise. * tests/test-getaddrinfo.c (getaddrinfo, freeaddrinfo) (gai_strerror): Likewise. * tests/test-getcwd.c (getcwd): Likewise. * tests/test-getdelim.c (getdelim): Likewise. * tests/test-getdtablesize.c (getdtablesize): Likewise. * tests/test-getgroups.c (getgroups): Likewise. * tests/test-gethostname.c (gethostname): Likewise. * tests/test-getline.c (getline): Likewise. * tests/test-getopt.c (getopt, getopt_long, getopt_long_only): Likewise. * tests/test-gettimeofday.c (gettimeofday): Likewise. * tests/test-glob.c (glob, globfree): Likewise. * tests/test-iconv.c (iconv, iconv_open, iconv_close): Likewise. * tests/test-inet_ntop.c (inet_ntop): Likewise. * tests/test-inet_pton.c (inet_pton): Likewise. * tests/test-isblank.c (isblank): Likewise. * tests/test-lchown.c (lchown): Likewise. * tests/test-ldexpl.c (ldexpl): Likewise. * tests/test-link.c (link): Likewise. * tests/test-linkat.c (linkat): Likewise. * tests/test-lseek.c (lseek): Likewise. * tests/test-lstat.c (lstat): Likewise. * tests/test-mbrtowc.c (mbrtowc): Likewise. * tests/test-mbsinit.c (mbsinit): Likewise. * tests/test-mbsnrtowcs.c (mbsnrtowcs): Likewise. * tests/test-mbsrtowcs.c (mbsrtowcs): Likewise. * tests/test-memchr.c (memchr): Likewise. * tests/test-memcmp.c (memcmp): Likewise. * tests/test-memmem.c (memmem): Likewise. * tests/test-memrchr.c (memrchr): Likewise. * tests/test-mkdir.c (mkdir): Likewise. * tests/test-mkdirat.c (mkdirat): Likewise. * tests/test-mkfifo.c (mkfifo): Likewise. * tests/test-mkfifoat.c (mkfifoat, mknodat): Likewise. * tests/test-mknod.c (mknod): Likewise. * tests/test-nanosleep.c (nanosleep): Likewise. * tests/test-nl_langinfo.c (nl_langinfo): Likewise. * tests/test-obstack-printf.c (obstack_printf, obstack_vprintf): Likewise. * tests/test-open.c (open): Likewise. * tests/test-openat.c (openat): Likewise. * tests/test-perror.c (perror): Likewise. * tests/test-pipe2.c (pipe2): Likewise. * tests/test-poll.c (poll): Likewise. * tests/test-popen.c (popen, pclose): Likewise. * tests/test-posix_spawn1.c (posix_spawnp, posix_spawnattr_init) (posix_spawnattr_destroy, posix_spawnattr_setsigmask) (posix_spawnattr_setflags, posix_spawn_file_actions_init) (posix_spawn_file_actions_destroy) (posix_spawn_file_actions_addclose) (posix_spawn_file_actions_addopen) (posix_spawn_file_actions_adddup2): Likewise. * tests/test-posix_spawn3.c (posix_spawn): Likewise. * tests/test-pread.c (pread): Likewise. * tests/test-printf-posix.c (printf): Likewise. * tests/test-pty.c (openpty, forkpty): Likewise. * tests/test-random_r.c (srandom_r, initstate_r, setstate_r) (random_r): Likewise. * tests/test-rawmemchr.c (rawmemchr): Likewise. * tests/test-readlink.c (readlink): Likewise. * tests/test-remove.c (remove): Likewise. * tests/test-rename.c (rename): Likewise. * tests/test-renameat.c (renameat): Likewise. * tests/test-rmdir.c (rmdir): Likewise. * tests/test-round1.c (round): Likewise. * tests/test-roundf1.c (roundf): Likewise. * tests/test-roundl.c (roundl): Likewise. * tests/test-setenv.c (setenv): Likewise. * tests/test-sigaction.c (sigaction): Likewise. * tests/test-sleep.c (sleep): Likewise. * tests/test-snprintf.c (snprintf): Likewise. * tests/test-sprintf-posix.c (sprintf): Likewise. * tests/test-stat.c (stat): Likewise. * tests/test-stpncpy.c (stpncpy): Likewise. * tests/test-strcasestr.c (strcasestr): Likewise. * tests/test-strchrnul.c (strchrnul): Likewise. * tests/test-strerror.c (strerror): Likewise. * tests/test-strsignal.c (strsignal): Likewise. * tests/test-strstr.c (strstr): Likewise. * tests/test-strtod.c (strtod): Likewise. * tests/test-strverscmp.c (strverscmp): Likewise. * tests/test-symlink.c (symlink): Likewise. * tests/test-symlinkat.c (symlinkat, readlinkat): Likewise. * tests/test-times.c (times): Likewise. * tests/test-trunc1.c (trunc): Likewise. * tests/test-truncf1.c (truncf): Likewise. * tests/test-truncl.c (truncl): Likewise. * tests/test-tsearch.c (tdelete, tfind, tsearch, twalk): Likewise. * tests/test-uname.c (uname): Likewise. * tests/test-unlink.c (unlink): Likewise. * tests/test-unlinkat.c (unlinkat): Likewise. * tests/test-unsetenv.c (unsetenv): Likewise. * tests/test-usleep.c (usleep): Likewise. * tests/test-utimensat.c (utimensat): Likewise. * tests/test-vasprintf.c (asprintf, vasprintf): Likewise. * tests/test-vdprintf-posix.c (vdprintf): Likewise. * tests/test-vfprintf-posix.c (vfprintf): Likewise. * tests/test-vprintf-posix.c (vprintf): Likewise. * tests/test-vsnprintf.c (vsnprintf): Likewise. * tests/test-vsprintf-posix.c (vsprintf): Likewise. * tests/test-wcrtomb.c (wcrtomb): Likewise. * tests/test-wcsnrtombs.c (wcsnrtombs): Likewise. * tests/test-wcsrtombs.c (wcsrtombs): Likewise. * tests/test-wcwidth.c (wcwidth): Likewise. Signed-off-by: Eric Blake <ebb9@byu.net>