long-options: add parse_gnu_standard_options_only Discussed in https://bugs.gnu.org/33468 . * lib/long-options.c (parse_long_options): Use EXIT_SUCCESS instead of 0. (parse_gnu_standard_options_only): Add function to process the GNU default options --help and --version and fail for any other unknown long or short option. See https://gnu.org/prep/standards/html_node/Command_002dLine-Interfaces.html . * lib/long-options.h (parse_gnu_standard_options_only): Declare it. * modules/long-options (depends-on): Add stdbool, exitfail. * top/maint.mk (sc_prohibit_long_options_without_use): Update syntax-check rule, add new function name.

Files:
tests/test-snprintf-posix.c
tests/test-snprintf-posix.h
tests/test-snprintf.c
tests/minus-zero.h
tests/infinity.h
tests/nan.h
tests/signature.h
tests/macros.h

Depends-on:
stdint
float

configure.ac:
AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
AC_DEFINE([CHECK_SNPRINTF_POSIX], 1,
  [Define to 1 for strict checking in test-snprintf.c.])

Makefile.am:
TESTS += test-snprintf-posix test-snprintf
check_PROGRAMS += test-snprintf-posix test-snprintf