80 lines
2.2 KiB
Plaintext
80 lines
2.2 KiB
Plaintext
# strtod.m4 serial 9
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dnl Copyright (C) 2002, 2003, 2006, 2007, 2008 Free Software
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dnl Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN([gl_FUNC_STRTOD],
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[
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AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
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AC_FUNC_STRTOD
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dnl Note: AC_FUNC_STRTOD does AC_LIBOBJ(strtod).
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if test $ac_cv_func_strtod = no; then
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HAVE_STRTOD=0
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REPLACE_STRTOD=1
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gl_PREREQ_STRTOD
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else
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AC_CACHE_CHECK([whether strtod obeys C99], [gl_cv_func_strtod_works],
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[AC_RUN_IFELSE([AC_LANG_PROGRAM([[
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#include <stdlib.h>
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#include <math.h>
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/* Compare two numbers with ==.
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This is a separate function because IRIX 6.5 "cc -O" miscompiles an
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'x == x' test. */
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static int
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numeric_equal (double x, double y)
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{
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return x == y;
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}
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]], [[
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{
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/* Older glibc and Cygwin mis-parse "-0x". */
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const char *string = "-0x";
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char *term;
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double value = strtod (string, &term);
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double zero = 0.0;
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if (1.0 / value != -1.0 / zero || term != (string + 2))
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return 1;
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}
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{
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/* Many platforms do not parse hex floats. */
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const char *string = "0XaP+1";
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char *term;
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double value = strtod (string, &term);
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if (value != 20.0 || term != (string + 6))
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return 1;
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}
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{
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/* Many platforms do not parse infinities. */
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const char *string = "inf";
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char *term;
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double value = strtod (string, &term);
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if (value != HUGE_VAL || term != (string + 3))
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return 1;
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}
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{
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/* glibc 2.7 and cygwin 1.5.24 misparse "nan()". */
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const char *string = "nan()";
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char *term;
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double value = strtod (string, &term);
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if (numeric_equal (value, value) || term != (string + 5))
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return 1;
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}
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]])],
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[gl_cv_func_strtod_works=yes],
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[gl_cv_func_strtod_works=no],
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[gl_cv_func_strtod_works="guessing no"])])
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if test "$gl_cv_func_strtod_works" != yes; then
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REPLACE_STRTOD=1
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gl_PREREQ_STRTOD
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dnl Use undocumented macro to set POW_LIB correctly.
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_AC_LIBOBJ_STRTOD
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fi
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fi
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])
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# Prerequisites of lib/strtod.c.
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# The need for pow() is already handled by AC_FUNC_STRTOD.
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AC_DEFUN([gl_PREREQ_STRTOD], [:])
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