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