Mercurial > gnulib
view m4/log10.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 | e2e6dc79463b |
children |
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# log10.m4 serial 9 dnl Copyright (C) 2011-2019 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_LOG10], [ m4_divert_text([DEFAULTS], [gl_log10_required=plain]) AC_REQUIRE([gl_MATH_H_DEFAULTS]) dnl Determine LOG10_LIBM. gl_COMMON_DOUBLE_MATHFUNC([log10]) save_LIBS="$LIBS" LIBS="$LIBS $LOG10_LIBM" gl_FUNC_LOG10_WORKS LIBS="$save_LIBS" case "$gl_cv_func_log10_works" in *yes) ;; *) REPLACE_LOG10=1 ;; esac m4_ifdef([gl_FUNC_LOG10_IEEE], [ if test $gl_log10_required = ieee && test $REPLACE_LOG10 = 0; then AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CACHE_CHECK([whether log10 works according to ISO C 99 with IEC 60559], [gl_cv_func_log10_ieee], [ save_LIBS="$LIBS" LIBS="$LIBS $LOG10_LIBM" AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #ifndef __NO_MATH_INLINES # define __NO_MATH_INLINES 1 /* for glibc */ #endif #include <math.h> /* Compare two numbers with ==. This is a separate function because IRIX 6.5 "cc -O" miscompiles an 'x == x' test. */ static int numeric_equal (double x, double y) { return x == y; } static double dummy (double x) { return 0; } int main (int argc, char *argv[]) { double (* volatile my_log10) (double) = argc ? log10 : dummy; /* Test log10(negative). This test fails on NetBSD 5.1, Solaris 11.4. */ double y = my_log10 (-1.0); if (numeric_equal (y, y)) return 1; return 0; } ]])], [gl_cv_func_log10_ieee=yes], [gl_cv_func_log10_ieee=no], [case "$host_os" in # Guess yes on glibc systems. *-gnu* | gnu*) gl_cv_func_log10_ieee="guessing yes" ;; # Guess yes on native Windows. mingw*) gl_cv_func_log10_ieee="guessing yes" ;; # If we don't know, assume the worst. *) gl_cv_func_log10_ieee="guessing no" ;; esac ]) LIBS="$save_LIBS" ]) case "$gl_cv_func_log10_ieee" in *yes) ;; *) REPLACE_LOG10=1 ;; esac fi ]) ]) dnl Test whether log10() works. dnl On OSF/1 5.1, log10(-0.0) is NaN. AC_DEFUN([gl_FUNC_LOG10_WORKS], [ AC_REQUIRE([AC_PROG_CC]) AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CACHE_CHECK([whether log10 works], [gl_cv_func_log10_works], [ AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #include <math.h> volatile double x; double y; int main () { x = -0.0; y = log10 (x); if (!(y + y == y)) return 1; return 0; } ]])], [gl_cv_func_log10_works=yes], [gl_cv_func_log10_works=no], [case "$host_os" in osf*) gl_cv_func_log10_works="guessing no" ;; # Guess yes on native Windows. mingw*) gl_cv_func_log10_works="guessing yes" ;; *) gl_cv_func_log10_works="guessing yes" ;; esac ]) ]) ])