Mercurial > gnulib
view m4/float_h.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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# float_h.m4 serial 12 dnl Copyright (C) 2007, 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. AC_DEFUN([gl_FLOAT_H], [ AC_REQUIRE([AC_PROG_CC]) AC_REQUIRE([AC_CANONICAL_HOST]) FLOAT_H= REPLACE_FLOAT_LDBL=0 case "$host_os" in aix* | beos* | openbsd* | mirbsd* | irix*) FLOAT_H=float.h ;; freebsd* | dragonfly*) case "$host_cpu" in changequote(,)dnl i[34567]86 ) changequote([,])dnl FLOAT_H=float.h ;; x86_64 ) # On x86_64 systems, the C compiler may still be generating # 32-bit code. AC_COMPILE_IFELSE( [AC_LANG_SOURCE( [[#if defined __LP64__ || defined __x86_64__ || defined __amd64__ int ok; #else error fail #endif ]])], [], [FLOAT_H=float.h]) ;; esac ;; linux*) case "$host_cpu" in powerpc*) FLOAT_H=float.h ;; esac ;; esac case "$host_os" in aix* | freebsd* | dragonfly* | linux*) if test -n "$FLOAT_H"; then REPLACE_FLOAT_LDBL=1 fi ;; esac dnl Test against glibc-2.7 Linux/SPARC64 bug. REPLACE_ITOLD=0 AC_CACHE_CHECK([whether conversion from 'int' to 'long double' works], [gl_cv_func_itold_works], [ AC_RUN_IFELSE( [AC_LANG_SOURCE([[ int i = -1; volatile long double ld; int main () { ld += i * 1.0L; if (ld > 0) return 1; return 0; }]])], [gl_cv_func_itold_works=yes], [gl_cv_func_itold_works=no], [case "$host" in sparc*-*-linux*) AC_COMPILE_IFELSE( [AC_LANG_SOURCE( [[#if defined __LP64__ || defined __arch64__ int ok; #else error fail #endif ]])], [gl_cv_func_itold_works="guessing no"], [gl_cv_func_itold_works="guessing yes"]) ;; # Guess yes on native Windows. mingw*) gl_cv_func_itold_works="guessing yes" ;; *) gl_cv_func_itold_works="guessing yes" ;; esac ]) ]) case "$gl_cv_func_itold_works" in *no) REPLACE_ITOLD=1 dnl We add the workaround to <float.h> but also to <math.h>, dnl to increase the chances that the fix function gets pulled in. FLOAT_H=float.h ;; esac if test -n "$FLOAT_H"; then gl_NEXT_HEADERS([float.h]) fi AC_SUBST([FLOAT_H]) AM_CONDITIONAL([GL_GENERATE_FLOAT_H], [test -n "$FLOAT_H"]) AC_SUBST([REPLACE_ITOLD]) ])