Mercurial > gnulib
view m4/stdbool.m4 @ 40177:dcd889592b62
dtoastr,ftoastr,ldtoastr: port to c-strtod changes
Decouple these modules from c-strtod. Nowadays it’s reasonable to
assume the C99 signatures for strtod and strtold. Programs that
require stricter adherence to C99 should also use the strtod and
strtold modules as needed, and we no longer need the
HAVE_C99_STRTOLD macro.
* NEWS: Mention this.
* lib/ftoastr.c (STRTOF) [LENGTH == 3]: Assume strtold.
* m4/c-strtod.m4 (gl_C_STRTOLD): Do not define HAVE_C99_STRTOLD.
* modules/dtoastr, modules/ftoastr, modules/ldtoastr:
(Files): Remove m4/c-strtod.m4.
(configure.ac): Do not require gl_C99_STRTOLD, which no longer
exists.
author | Paul Eggert <eggert@cs.ucla.edu> |
---|---|
date | Sat, 02 Feb 2019 13:01:55 -0800 |
parents | b06060465f09 |
children |
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# Check for stdbool.h that conforms to C99. dnl Copyright (C) 2002-2006, 2009-2019 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. #serial 7 # Prepare for substituting <stdbool.h> if it is not supported. AC_DEFUN([AM_STDBOOL_H], [ AC_REQUIRE([AC_CHECK_HEADER_STDBOOL]) # Define two additional variables used in the Makefile substitution. if test "$ac_cv_header_stdbool_h" = yes; then STDBOOL_H='' else STDBOOL_H='stdbool.h' fi AC_SUBST([STDBOOL_H]) AM_CONDITIONAL([GL_GENERATE_STDBOOL_H], [test -n "$STDBOOL_H"]) if test "$ac_cv_type__Bool" = yes; then HAVE__BOOL=1 else HAVE__BOOL=0 fi AC_SUBST([HAVE__BOOL]) ]) # AM_STDBOOL_H will be renamed to gl_STDBOOL_H in the future. AC_DEFUN([gl_STDBOOL_H], [AM_STDBOOL_H]) # This version of the macro is needed in autoconf <= 2.68. AC_DEFUN([AC_CHECK_HEADER_STDBOOL], [AC_CACHE_CHECK([for stdbool.h that conforms to C99], [ac_cv_header_stdbool_h], [AC_COMPILE_IFELSE( [AC_LANG_PROGRAM( [[ #include <stdbool.h> #ifdef __cplusplus typedef bool Bool; #else typedef _Bool Bool; #ifndef bool "error: bool is not defined" #endif #ifndef false "error: false is not defined" #endif #if false "error: false is not 0" #endif #ifndef true "error: true is not defined" #endif #if true != 1 "error: true is not 1" #endif #endif #ifndef __bool_true_false_are_defined "error: __bool_true_false_are_defined is not defined" #endif struct s { Bool s: 1; Bool t; bool u: 1; bool v; } s; char a[true == 1 ? 1 : -1]; char b[false == 0 ? 1 : -1]; char c[__bool_true_false_are_defined == 1 ? 1 : -1]; char d[(bool) 0.5 == true ? 1 : -1]; /* See body of main program for 'e'. */ char f[(Bool) 0.0 == false ? 1 : -1]; char g[true]; char h[sizeof (Bool)]; char i[sizeof s.t]; enum { j = false, k = true, l = false * true, m = true * 256 }; /* The following fails for HP aC++/ANSI C B3910B A.05.55 [Dec 04 2003]. */ Bool n[m]; char o[sizeof n == m * sizeof n[0] ? 1 : -1]; char p[-1 - (Bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1]; /* Catch a bug in an HP-UX C compiler. See https://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html https://lists.gnu.org/r/bug-coreutils/2005-11/msg00161.html */ Bool q = true; Bool *pq = &q; bool *qq = &q; ]], [[ bool e = &s; *pq |= q; *pq |= ! q; *qq |= q; *qq |= ! q; /* Refer to every declared value, to avoid compiler optimizations. */ return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !!j + !k + !!l + !m + !n + !o + !p + !q + !pq + !qq); ]])], [ac_cv_header_stdbool_h=yes], [ac_cv_header_stdbool_h=no])]) AC_CHECK_TYPES([_Bool]) ])