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comparison config/math.m4 @ 111:04ced10e8804

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gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
parents
children 1830386684a0
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68:561a7518be6b 111:04ced10e8804
1 dnl GCC_CHECK_LIBM
2 dnl
3 dnl Check whether -lm is available. This is a pre-requisite for
4 dnl GCC_CHECK_MATH_FUNC so that it will link with -lm.
5 AC_DEFUN([GCC_CHECK_LIBM],
6 [AC_CHECK_LIB([m],[sin])])
7
8 dnl GCC_CHECK_MATH_HEADERS
9 dnl
10 dnl Check for math.h and complex.h. This is a pre-requisite for
11 dnl GCC_CHECK_MATH_FUNC so that it includes the right headers.
12 dnl (Some systems, such as AIX or OpenVMS may define macro for math
13 dnl functions).
14 AC_DEFUN([GCC_CHECK_MATH_HEADERS],
15 [AC_CHECK_HEADERS_ONCE(math.h complex.h)])
16
17 dnl GCC_CHECK_MATH_FUNC([name])
18 dnl
19 dnl Check whether math function NAME is available on the system (by compiling
20 dnl and linking a C program) and run define HAVE_name on success.
21 dnl
22 dnl Note that OpenVMS system insists on including complex.h before math.h
23 AC_DEFUN([GCC_CHECK_MATH_FUNC],
24 [
25 AC_REQUIRE([GCC_CHECK_LIBM])
26 AC_REQUIRE([GCC_CHECK_MATH_HEADERS])
27 AC_CACHE_CHECK([for $1], [gcc_cv_math_func_$1],
28 [AC_LINK_IFELSE([
29 #ifdef HAVE_COMPLEX_H
30 #include <complex.h>
31 #endif
32 #ifdef HAVE_MATH_H
33 #include <math.h>
34 #endif
35
36 int (*ptr)() = (int (*)())$1;
37
38 int
39 main ()
40 {
41 return 0;
42 }
43 ],
44 [gcc_cv_math_func_$1=yes],
45 [gcc_cv_math_func_$1=no])])
46 if test $gcc_cv_math_func_$1 = yes; then
47 AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_$1),[1],
48 [Define to 1 if you have the `$1' function.])
49 fi
50 ])