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math.m4: New file.

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2012-03-26  Tristan Gingold  <gingold@adacore.com>

	* math.m4: New file.

From-SVN: r185788
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Tristan Gingold 2012-03-26 08:42:52 +00:00 • committed by Tristan Gingold
parent 2169f14c29
commit ffc2b71438
2 changed files with 53 additions and 0 deletions
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4
config/ChangeLog
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@ -1,3 +1,7 @@
2012-03-26 Tristan Gingold <gingold@adacore.com>
* math.m4: New file.
2012-03-12 Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
* weakref.m4 (GCC_CHECK_ELF_STYLE_WEAKREF): Remove

49
config/math.m4 Normal file
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dnl GCC_CHECK_LIBM
dnl
dnl Check whether -lm is available. This is a pre-requisite for
dnl GCC_CHECK_MATH_FUNC so that it will link with -lm.
AC_DEFUN([GCC_CHECK_LIBM],
[AC_CHECK_LIB([m],[sin])])
dnl GCC_CHECK_MATH_HEADERS
dnl
dnl Check for math.h and complex.h. This is a pre-requisite for
dnl GCC_CHECK_MATH_FUNC so that it includes the right headers.
dnl (Some systems, such as AIX or OpenVMS may define macro for math
dnl functions).
AC_DEFUN([GCC_CHECK_MATH_HEADERS],
[AC_CHECK_HEADERS_ONCE(math.h complex.h)])
dnl GCC_CHECK_MATH_FUNC([name],[if-present])
dnl
dnl Check whether math function NAME is available on the system (by compiling
dnl and linking a C program) and run if-present on success.
dnl
dnl Note that OpenVMS system insists on including complex.h before math.h
AC_DEFUN([GCC_CHECK_MATH_FUNC],
[
AC_REQUIRE([GCC_CHECK_LIBM])
AC_REQUIRE([GCC_CHECK_MATH_HEADERS])
AC_CACHE_CHECK([for $1], [gcc_cv_math_func_$1],
[AC_LINK_IFELSE([
#ifdef HAVE_COMPLEX_H
#include <complex.h>
#endif
#ifdef HAVE_MATH_H
#include <math.h>
#endif
int (*ptr)() = (int (*)())$1;
int
main ()
{
return 0;
}
],
[gcc_cv_math_func_$1=yes],
[gcc_cv_math_func_$1=no])])
if test $gcc_cv_math_func_$1 = yes; then
$2
fi
])