1dnl GCC_CHECK_LIBM
2dnl
3dnl Check whether -lm is available.  This is a pre-requisite for
4dnl GCC_CHECK_MATH_FUNC so that it will link with -lm.
5AC_DEFUN([GCC_CHECK_LIBM],
6[AC_CHECK_LIB([m],[sin])])
7
8dnl GCC_CHECK_MATH_HEADERS
9dnl
10dnl Check for math.h and complex.h.  This is a pre-requisite for
11dnl GCC_CHECK_MATH_FUNC so that it includes the right headers.
12dnl (Some systems, such as AIX or OpenVMS may define macro for math
13dnl  functions).
14AC_DEFUN([GCC_CHECK_MATH_HEADERS],
15[AC_CHECK_HEADERS_ONCE(math.h complex.h)])
16
17dnl GCC_CHECK_MATH_FUNC([name])
18dnl
19dnl Check whether math function NAME is available on the system (by compiling
20dnl and linking a C program) and run define HAVE_name on success.
21dnl
22dnl Note that OpenVMS system insists on including complex.h before math.h
23AC_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([AC_LANG_SOURCE([
29#ifdef HAVE_COMPLEX_H
30#include <complex.h>
31#endif
32#ifdef HAVE_MATH_H
33#include <math.h>
34#endif
35
36int (*ptr)() = (int (*)())$1;
37
38int
39main ()
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])
51
52dnl GCC_CHECK_MATH_INLINE_BUILTIN_FALLBACK1([name], [type])
53dnl
54dnl Check if math function NAME fallback for function with single
55dnl TYPE argument and TYPE result can be implemented using
56dnl __builtin_NAME expanded inline without needing unavailable math
57dnl library function.
58AC_DEFUN([GCC_CHECK_MATH_INLINE_BUILTIN_FALLBACK1],
59[
60  AC_REQUIRE([GCC_CHECK_LIBM])
61if test $gcc_cv_math_func_$1 = no; then
62  AC_CACHE_CHECK([for inline __builtin_$1], [gcc_cv_math_inline_builtin_$1],
63		 [AC_LINK_IFELSE([AC_LANG_SOURCE([
64$2
65$1_fallback ($2 x)
66{
67  return __builtin_$1 (x);
68}
69
70int
71main ()
72{
73  return 0;
74}
75])],
76[gcc_cv_math_inline_builtin_$1=yes],
77[gcc_cv_math_inline_builtin_$1=no])])
78  if test $gcc_cv_math_inline_builtin_$1 = yes; then
79    AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_INLINE_BUILTIN_$1),[1],
80	      [Define to 1 if `__builtin_$1' is expanded inline.])
81  fi
82fi])
83
84dnl GCC_CHECK_MATH_INLINE_BUILTIN_FALLBACK2([name], [type])
85dnl
86dnl Check if math function NAME fallback for function with two
87dnl TYPE arguments and TYPE result can be implemented using
88dnl __builtin_NAME expanded inline without needing unavailable math
89dnl library function.
90AC_DEFUN([GCC_CHECK_MATH_INLINE_BUILTIN_FALLBACK2],
91[
92  AC_REQUIRE([GCC_CHECK_LIBM])
93if test $gcc_cv_math_func_$1 = no; then
94  AC_CACHE_CHECK([for inline __builtin_$1], [gcc_cv_math_inline_builtin_$1],
95		 [AC_LINK_IFELSE([AC_LANG_SOURCE([
96$2
97$1_fallback ($2 x, $2 y)
98{
99  return __builtin_$1 (x, y);
100}
101
102int
103main ()
104{
105  return 0;
106}
107])],
108[gcc_cv_math_inline_builtin_$1=yes],
109[gcc_cv_math_inline_builtin_$1=no])])
110  if test $gcc_cv_math_inline_builtin_$1 = yes; then
111    AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_INLINE_BUILTIN_$1),[1],
112	      [Define to 1 if `__builtin_$1' is expanded inline.])
113  fi
114fi])
115