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.

Description:
verror and verror_at_line functions: Error reporting with va_list.

Notice:
If you are using GNU gettext version 0.16.1 or older, add the following options
to XGETTEXT_OPTIONS in your po/Makevars:
  --flag=verror:3:c-format --flag=verror_at_line:5:c-format

Files:
lib/verror.h
lib/verror.c

Depends-on:
error
xvasprintf

configure.ac:
m4_ifdef([AM_XGETTEXT_OPTION],
  [AM_][XGETTEXT_OPTION([--flag=verror:3:c-format])
   AM_][XGETTEXT_OPTION([--flag=verror_at_line:5:c-format])])

Makefile.am:
lib_SOURCES += verror.h verror.c

Include:
"verror.h"

License:
GPL

Maintainer:
Eric Blake