-# strtod.m4 serial 8
-dnl Copyright (C) 2002, 2003, 2006, 2007, 2008 Free Software
-dnl Foundation, Inc.
+# strtod.m4 serial 22
+dnl Copyright (C) 2002-2003, 2006-2013 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_STRTOD],
[
AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
- AC_FUNC_STRTOD
- dnl Note: AC_FUNC_STRTOD does AC_LIBOBJ(strtod).
- if test $ac_cv_func_strtod = no; then
- HAVE_STRTOD=0
- REPLACE_STRTOD=1
- gl_PREREQ_STRTOD
- else
+ m4_ifdef([gl_FUNC_STRTOD_OBSOLETE], [
+ dnl Test whether strtod is declared.
+ dnl Don't call AC_FUNC_STRTOD, because it does not have the right guess
+ dnl when cross-compiling.
+ dnl Don't call AC_CHECK_FUNCS([strtod]) because it would collide with the
+ dnl ac_cv_func_strtod variable set by the AC_FUNC_STRTOD macro.
+ AC_CHECK_DECLS_ONCE([strtod])
+ if test $ac_cv_have_decl_strtod != yes; then
+ HAVE_STRTOD=0
+ fi
+ ])
+ if test $HAVE_STRTOD = 1; then
AC_CACHE_CHECK([whether strtod obeys C99], [gl_cv_func_strtod_works],
[AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#include <stdlib.h>
#include <math.h>
+#include <errno.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;
+}
]], [[
+ int result = 0;
+ {
+ /* In some old versions of Linux (2000 or before), strtod mis-parses
+ strings with leading '+'. */
+ const char *string = " +69";
+ char *term;
+ double value = strtod (string, &term);
+ if (value != 69 || term != (string + 4))
+ result |= 1;
+ }
+ {
+ /* Under Solaris 2.4, strtod returns the wrong value for the
+ terminating character under some conditions. */
+ const char *string = "NaN";
+ char *term;
+ strtod (string, &term);
+ if (term != string && *(term - 1) == 0)
+ result |= 2;
+ }
{
/* Older glibc and Cygwin mis-parse "-0x". */
const char *string = "-0x";
char *term;
double value = strtod (string, &term);
- if (1 / value != -HUGE_VAL || term != (string + 2))
- return 1;
+ double zero = 0.0;
+ if (1.0 / value != -1.0 / zero || term != (string + 2))
+ result |= 4;
}
{
/* Many platforms do not parse hex floats. */
char *term;
double value = strtod (string, &term);
if (value != 20.0 || term != (string + 6))
- return 1;
+ result |= 8;
}
{
- /* Many platforms do not parse infinities. */
+ /* Many platforms do not parse infinities. HP-UX 11.31 parses inf,
+ but mistakenly sets errno. */
const char *string = "inf";
char *term;
+ double value;
+ errno = 0;
+ value = strtod (string, &term);
+ if (value != HUGE_VAL || term != (string + 3) || errno)
+ result |= 16;
+ }
+ {
+ /* glibc 2.7 and cygwin 1.5.24 misparse "nan()". */
+ const char *string = "nan()";
+ char *term;
double value = strtod (string, &term);
- if (value != HUGE_VAL || term != (string + 3))
- return 1;
+ if (numeric_equal (value, value) || term != (string + 5))
+ result |= 32;
}
+ {
+ /* darwin 10.6.1 misparses "nan(". */
+ const char *string = "nan(";
+ char *term;
+ double value = strtod (string, &term);
+ if (numeric_equal (value, value) || term != (string + 3))
+ result |= 64;
+ }
+ return result;
]])],
- [gl_cv_func_strtod_works=yes],
- [gl_cv_func_strtod_works=no],
- [gl_cv_func_strtod_works="guessing no"])])
- if test "$gl_cv_func_strtod_works" != yes; then
- REPLACE_STRTOD=1
- gl_PREREQ_STRTOD
- dnl Use undocumented macro to set POW_LIB correctly.
- _AC_LIBOBJ_STRTOD
- fi
+ [gl_cv_func_strtod_works=yes],
+ [gl_cv_func_strtod_works=no],
+ [dnl The last known bugs in glibc strtod(), as of this writing,
+ dnl were fixed in version 2.8
+ AC_EGREP_CPP([Lucky user],
+ [
+#include <features.h>
+#ifdef __GNU_LIBRARY__
+ #if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 8) || (__GLIBC__ > 2)) \
+ && !defined __UCLIBC__
+ Lucky user
+ #endif
+#endif
+ ],
+ [gl_cv_func_strtod_works="guessing yes"],
+ [gl_cv_func_strtod_works="guessing no"])])])
+ case "$gl_cv_func_strtod_works" in
+ *yes) ;;
+ *)
+ REPLACE_STRTOD=1
+ ;;
+ esac
fi
])
# Prerequisites of lib/strtod.c.
-# The need for pow() is already handled by AC_FUNC_STRTOD.
-AC_DEFUN([gl_PREREQ_STRTOD], [:])
+AC_DEFUN([gl_PREREQ_STRTOD], [
+ AC_REQUIRE([gl_CHECK_LDEXP_NO_LIBM])
+ if test $gl_cv_func_ldexp_no_libm = yes; then
+ AC_DEFINE([HAVE_LDEXP_IN_LIBC], [1],
+ [Define if the ldexp function is available in libc.])
+ fi
+])