Mercurial > gnulib
view m4/modf.m4 @ 40109:e2e6dc79463b
Defeat current GCC optimizations in math autoconf tests.
* m4/cbrtl.m4 (gl_FUNC_CBRTL): Mark function pointer as 'volatile'.
* m4/ceil.m4 (gl_FUNC_CEIL): Likewise.
* m4/ceilf.m4 (gl_FUNC_CEILF): Likewise.
* m4/ceill.m4 (gl_FUNC_CEILL): Likewise.
* m4/exp2l.m4 (gl_FUNC_EXP2L): Likewise.
* m4/expm1.m4 (gl_FUNC_EXPM1): Likewise.
* m4/floor.m4 (gl_FUNC_FLOOR): Likewise.
* m4/floorf.m4 (gl_FUNC_FLOORF): Likewise.
* m4/fmod.m4 (gl_FUNC_FMOD): Likewise.
* m4/fmodf.m4 (gl_FUNC_FMODF): Likewise.
* m4/fmodl.m4 (gl_FUNC_FMODL): Likewise.
* m4/hypot.m4 (gl_FUNC_HYPOT): Likewise.
* m4/hypotf.m4 (gl_FUNC_HYPOTF): Likewise.
* m4/hypotl.m4 (gl_FUNC_HYPOTL): Likewise.
* m4/ilogb.m4 (gl_FUNC_ILOGB_WORKS): Likewise.
* m4/ilogbf.m4 (gl_FUNC_ILOGBF_WORKS): Likewise.
* m4/ilogbl.m4 (gl_FUNC_ILOGBL_WORKS): Likewise.
* m4/log.m4 (gl_FUNC_LOG): Likewise.
* m4/logf.m4 (gl_FUNC_LOGF): Likewise.
* m4/log10.m4 (gl_FUNC_LOG10): Likewise.
* m4/log10f.m4 (gl_FUNC_LOG10F): Likewise.
* m4/log1p.m4 (gl_FUNC_LOG1P): Likewise.
* m4/log1pf.m4 (gl_FUNC_LOG1PF): Likewise.
* m4/log1pl.m4 (gl_FUNC_LOG1PL): Likewise.
* m4/log2.m4 (gl_FUNC_LOG2): Likewise.
* m4/log2f.m4 (gl_FUNC_LOG2F): Likewise.
* m4/modf.m4 (gl_FUNC_MODF): Likewise.
* m4/modff.m4 (gl_FUNC_MODFF): Likewise.
* m4/modfl.m4 (gl_FUNC_MODFL): Likewise.
* m4/remainder.m4 (gl_FUNC_REMAINDER): Likewise.
* m4/remainderf.m4 (gl_FUNC_REMAINDERF): Likewise.
* m4/remainderl.m4 (gl_FUNC_REMAINDERL): Likewise.
* m4/round.m4 (gl_FUNC_ROUND): Likewise.
* m4/roundf.m4 (gl_FUNC_ROUNDF): Likewise.
* m4/roundl.m4 (gl_FUNC_ROUNDL): Likewise.
* m4/trunc.m4 (gl_FUNC_TRUNC): Likewise.
* m4/truncf.m4 (gl_FUNC_TRUNCF): Likewise.
* m4/truncl.m4 (gl_FUNC_TRUNCL): Likewise.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Sun, 20 Jan 2019 21:19:41 +0100 |
parents | b06060465f09 |
children |
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# modf.m4 serial 6 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_MODF], [ m4_divert_text([DEFAULTS], [gl_modf_required=plain]) AC_REQUIRE([gl_MATH_H_DEFAULTS]) dnl Determine MODF_LIBM. gl_MATHFUNC([modf], [double], [(double, double *)]) m4_ifdef([gl_FUNC_MODF_IEEE], [ if test $gl_modf_required = ieee && test $REPLACE_MODF = 0; then AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CACHE_CHECK([whether modf works according to ISO C 99 with IEC 60559], [gl_cv_func_modf_ieee], [ save_LIBS="$LIBS" LIBS="$LIBS $MODF_LIBM" AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #ifndef __NO_MATH_INLINES # define __NO_MATH_INLINES 1 /* for glibc */ #endif #include <math.h> ]gl_DOUBLE_MINUS_ZERO_CODE[ ]gl_DOUBLE_SIGNBIT_CODE[ /* Compare two numbers with ==. This is a separate function because IRIX 6.5 "cc -O" miscompiles an 'x == x' test. */ static int numeric_equal (double x, double y) { return x == y; } static double dummy (double x, double *iptr) { return 0; } double zero; double minus_one = - 1.0; int main (int argc, char *argv[]) { double (* volatile my_modf) (double, double *) = argc ? modf : dummy; int result = 0; double i; double f; /* Test modf(NaN,...). This test fails on NetBSD 5.1, Cygwin. */ f = my_modf (zero / zero, &i); if (numeric_equal (f, f)) result |= 1; /* Test modf(-Inf,...). This test fails on FreeBSD 6.4, OpenBSD 4.9, IRIX 6.5, OSF/1 5.1. */ f = my_modf (minus_one / zero, &i); if (!(f == 0.0) || (signbitd (minus_zerod) && !signbitd (f))) result |= 2; return result; } ]])], [gl_cv_func_modf_ieee=yes], [gl_cv_func_modf_ieee=no], [case "$host_os" in # Guess yes on glibc systems. *-gnu* | gnu*) gl_cv_func_modf_ieee="guessing yes" ;; # Guess yes on MSVC, no on mingw. mingw*) AC_EGREP_CPP([Known], [ #ifdef _MSC_VER Known #endif ], [gl_cv_func_modf_ieee="guessing yes"], [gl_cv_func_modf_ieee="guessing no"]) ;; # If we don't know, assume the worst. *) gl_cv_func_modf_ieee="guessing no" ;; esac ]) LIBS="$save_LIBS" ]) case "$gl_cv_func_modf_ieee" in *yes) ;; *) REPLACE_MODF=1 ;; esac fi ]) if test $REPLACE_MODF = 1; then dnl Find libraries needed to link lib/modf.c. AC_REQUIRE([gl_FUNC_TRUNC]) MODF_LIBM="$TRUNC_LIBM" fi ])