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diff m4/acinclude.m4 @ 14550:bc4c574ab3b6

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Add configure check for isnan in fortran. * libcruft/slatec-fn/erfc.in.f: Rename from erfc.f. * libcruft/slatec-fn/derfc.in.f: Rename from derfc.f. * libcruft/slatec-fn/module.mk (slatec-fn/derfc.f, slatec-fn/erfc.f): New targets and rules. * m4/acinclude.m4 (OCTAVE_CHECK_FORTRAN_HAVE_ISNAN): New macro. * configure.ac: Use it. Substitute F77_ISNAN_MACRO. * build-aux/common.mk (F77_ISNAN_MACRO): New variable.
author Carlo de Falco <cdf@users.sourceforge.net>
date Wed, 11 Apr 2012 15:40:01 -0400
parents 2258a0b73eb8
children 28e53daab1f8
line wrap: on
line diff
--- a/m4/acinclude.m4
+++ b/m4/acinclude.m4
@@ -329,6 +329,28 @@
   fi
 ])
 dnl
+dnl Check to see whether Fortran compiler has the intrinsic function ISNAN.
+dnl
+AC_DEFUN([OCTAVE_CHECK_FORTRAN_HAVE_ISNAN], [
+  AC_LANG_PUSH(Fortran 77)
+  AC_CACHE_CHECK([whether $F77 has the intrinsic function ISNAN],
+                 [octave_cv_fortran_have_isnan],
+[AC_COMPILE_IFELSE(
+[      program foo
+      implicit none
+      real x
+      double precision y
+      if (isnan(x)) then
+         print *, 'x is NaN'
+      end if
+      if (isnan(y)) then
+         print *, 'y is NaN'
+      end if
+      end program], [octave_cv_fortran_have_isnan=yes], [octave_cv_fortran_have_isnan=no]
+)])
+  AC_LANG_POP(Fortran 77)      
+])
+dnl
 dnl Check to see whether the default Fortran INTEGER is 64 bits wide.
 dnl
 AC_DEFUN([OCTAVE_CHECK_FORTRAN_INTEGER_SIZE], [