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111
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1 dnl GCC_CHECK_LIBM
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2 dnl
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3 dnl Check whether -lm is available. This is a pre-requisite for
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4 dnl GCC_CHECK_MATH_FUNC so that it will link with -lm.
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5 AC_DEFUN([GCC_CHECK_LIBM],
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6 [AC_CHECK_LIB([m],[sin])])
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7
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8 dnl GCC_CHECK_MATH_HEADERS
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9 dnl
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10 dnl Check for math.h and complex.h. This is a pre-requisite for
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11 dnl GCC_CHECK_MATH_FUNC so that it includes the right headers.
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12 dnl (Some systems, such as AIX or OpenVMS may define macro for math
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13 dnl functions).
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14 AC_DEFUN([GCC_CHECK_MATH_HEADERS],
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15 [AC_CHECK_HEADERS_ONCE(math.h complex.h)])
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16
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17 dnl GCC_CHECK_MATH_FUNC([name])
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18 dnl
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19 dnl Check whether math function NAME is available on the system (by compiling
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20 dnl and linking a C program) and run define HAVE_name on success.
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21 dnl
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22 dnl Note that OpenVMS system insists on including complex.h before math.h
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23 AC_DEFUN([GCC_CHECK_MATH_FUNC],
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24 [
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25 AC_REQUIRE([GCC_CHECK_LIBM])
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26 AC_REQUIRE([GCC_CHECK_MATH_HEADERS])
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27 AC_CACHE_CHECK([for $1], [gcc_cv_math_func_$1],
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28 [AC_LINK_IFELSE([
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29 #ifdef HAVE_COMPLEX_H
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30 #include <complex.h>
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31 #endif
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32 #ifdef HAVE_MATH_H
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33 #include <math.h>
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34 #endif
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35
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36 int (*ptr)() = (int (*)())$1;
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37
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38 int
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39 main ()
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40 {
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41 return 0;
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42 }
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43 ],
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44 [gcc_cv_math_func_$1=yes],
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45 [gcc_cv_math_func_$1=no])])
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46 if test $gcc_cv_math_func_$1 = yes; then
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47 AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_$1),[1],
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48 [Define to 1 if you have the `$1' function.])
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49 fi
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50 ])
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