-# signbit.m4 serial 6
-dnl Copyright (C) 2007-2009 Free Software Foundation, Inc.
+# signbit.m4 serial 7
+dnl Copyright (C) 2007-2010 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_REQUIRE([gl_MATH_H_DEFAULTS])
AC_CACHE_CHECK([for signbit macro], [gl_cv_func_signbit],
[
- AC_TRY_RUN([
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
#include <math.h>
/* If signbit is defined as a function, don't use it, since calling it for
'float' or 'long double' arguments would involve conversions.
#endif
#include <string.h>
]gl_SIGNBIT_TEST_PROGRAM
-, [gl_cv_func_signbit=yes], [gl_cv_func_signbit=no],
+])],
+ [gl_cv_func_signbit=yes],
+ [gl_cv_func_signbit=no],
[gl_cv_func_signbit="guessing no"])
])
dnl GCC 4.0 and newer provides three built-ins for signbit.
dnl libc.
AC_CACHE_CHECK([for signbit compiler built-ins], [gl_cv_func_signbit_gcc],
[
- AC_TRY_RUN([
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
#if __GNUC__ >= 4
# define signbit(x) \
(sizeof (x) == sizeof (long double) ? __builtin_signbitl (x) : \
#endif
#include <string.h>
]gl_SIGNBIT_TEST_PROGRAM
-, [gl_cv_func_signbit_gcc=yes], [gl_cv_func_signbit_gcc=no],
+])],
+ [gl_cv_func_signbit_gcc=yes],
+ [gl_cv_func_signbit_gcc=no],
[gl_cv_func_signbit_gcc="guessing no"])
])
dnl Use the compiler built-ins whenever possible, because they are more
AC_CACHE_CHECK([whether copysignf can be used without linking with libm],
[gl_cv_func_copysignf_no_libm],
[
- AC_TRY_LINK([#include <math.h>
- float x, y;],
- [return copysignf (x, y) < 0;],
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <math.h>
+ float x, y;]],
+ [[return copysignf (x, y) < 0;]])],
[gl_cv_func_copysignf_no_libm=yes],
[gl_cv_func_copysignf_no_libm=no])
])
AC_CACHE_CHECK([whether copysign can be used without linking with libm],
[gl_cv_func_copysign_no_libm],
[
- AC_TRY_LINK([#include <math.h>
- double x, y;],
- [return copysign (x, y) < 0;],
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <math.h>
+ double x, y;]],
+ [[return copysign (x, y) < 0;]])],
[gl_cv_func_copysign_no_libm=yes],
[gl_cv_func_copysign_no_libm=no])
])
AC_CACHE_CHECK([whether copysignl can be used without linking with libm],
[gl_cv_func_copysignl_no_libm],
[
- AC_TRY_LINK([#include <math.h>
- long double x, y;],
- [return copysignl (x, y) < 0;],
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <math.h>
+ long double x, y;]],
+ [[return copysignl (x, y) < 0;]])],
[gl_cv_func_copysignl_no_libm=yes],
[gl_cv_func_copysignl_no_libm=no])
])
AC_CACHE_CHECK([where to find the sign bit in a '$1'],
[$2],
[
- AC_TRY_RUN([
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
#include <stddef.h>
#include <stdio.h>
#define NWORDS \
fprintf (fp, "word %d bit %d", (int) k, (int) i);
return (fclose (fp) != 0);
}
- ],
+ ]])],
[$2=`cat conftest.out`],
[$2="unknown"],
[