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-rw-r--r--config/math.m450
1 files changed, 50 insertions, 0 deletions
diff --git a/config/math.m4 b/config/math.m4
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+++ b/config/math.m4
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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])
+dnl
+dnl Check whether math function NAME is available on the system (by compiling
+dnl and linking a C program) and run define HAVE_name 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
+ AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_$1),[1],
+ [Define to 1 if you have the `$1' function.])
+ fi
+])