Mercurial > gnulib
view m4/ldexp.m4 @ 40198:5a34193cbc07
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.
author | Bernhard Voelker <mail@bernhard-voelker.de> |
---|---|
date | Thu, 29 Nov 2018 09:06:26 +0100 |
parents | b06060465f09 |
children |
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# ldexp.m4 serial 1 dnl Copyright (C) 2010-2019 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. AC_DEFUN([gl_FUNC_LDEXP], [ AC_REQUIRE([gl_CHECK_LDEXP_NO_LIBM]) LDEXP_LIBM= if test $gl_cv_func_ldexp_no_libm = no; then AC_CACHE_CHECK([whether ldexp() can be used with libm], [gl_cv_func_ldexp_in_libm], [ save_LIBS="$LIBS" LIBS="$LIBS -lm" AC_LINK_IFELSE( [AC_LANG_PROGRAM([[#ifndef __NO_MATH_INLINES # define __NO_MATH_INLINES 1 /* for glibc */ #endif #include <math.h> double (*funcptr) (double, int) = ldexp; double x;]], [[return ldexp (x, -1) > 0;]])], [gl_cv_func_ldexp_in_libm=yes], [gl_cv_func_ldexp_in_libm=no]) LIBS="$save_LIBS" ]) if test $gl_cv_func_ldexp_in_libm = yes; then LDEXP_LIBM=-lm fi fi AC_SUBST([LDEXP_LIBM]) ]) dnl Test whether ldexp() can be used without linking with libm. dnl Set gl_cv_func_ldexp_no_libm to 'yes' or 'no' accordingly. AC_DEFUN([gl_CHECK_LDEXP_NO_LIBM], [ AC_CACHE_CHECK([whether ldexp() can be used without linking with libm], [gl_cv_func_ldexp_no_libm], [ AC_LINK_IFELSE( [AC_LANG_PROGRAM([[#ifndef __NO_MATH_INLINES # define __NO_MATH_INLINES 1 /* for glibc */ #endif #include <math.h> double (*funcptr) (double, int) = ldexp; double x;]], [[return ldexp (x, -1) > 0;]])], [gl_cv_func_ldexp_no_libm=yes], [gl_cv_func_ldexp_no_libm=no]) ]) ])