1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
|
AC_DEFUN([ACX_STD_ABS], [
AC_MSG_CHECKING([std::abs(long)])
AC_LANG_PUSH([C++])
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <cmath>
#include <cstdlib>
long (*absptr)(long) = &std::abs;
long a = -1;
long b = std::abs(a);
]])],
[AC_DEFINE(HAVE_STD_ABS_LONG,[1],[Define if have std::abs(long)]) have_abs_long=yes],
[have_abs_long=no])
AC_MSG_RESULT([$have_abs_long])
if test X"$have_abs_long" = Xno; then
AC_MSG_CHECKING([std::labs(long)])
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <cmath>
#include <cstdlib>
long (*labsptr)(long) = &std::labs;
long a = -1l;
long b = labs(a);
]])],
[AC_DEFINE(HAVE_LABS,[1],[Define if have std::labs(long)]) have_std_labs=yes],
[have_std_labs=no])
AC_MSG_RESULT([$have_std_labs])
fi
])
|
