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authorAndreas Rottmann <a.rottmann@gmx.at>2009-09-14 12:32:44 +0200
committerAndreas Rottmann <a.rottmann@gmx.at>2009-09-14 12:32:44 +0200
commitfa095a4504cbe668e4244547e2c141597bea4ecf (patch)
tree06135820a286ffec47804e75fbf8a147e92acd2e /gnulib-m4/isnand.m4
Imported Upstream version 0.9.1upstream/0.9.1
Diffstat (limited to 'gnulib-m4/isnand.m4')
-rw-r--r--gnulib-m4/isnand.m495
1 files changed, 95 insertions, 0 deletions
diff --git a/gnulib-m4/isnand.m4 b/gnulib-m4/isnand.m4
new file mode 100644
index 00000000..c823c2ce
--- /dev/null
+++ b/gnulib-m4/isnand.m4
@@ -0,0 +1,95 @@
+# isnand.m4 serial 6
+dnl Copyright (C) 2007-2009 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl Check how to get or define isnand().
+
+AC_DEFUN([gl_FUNC_ISNAND],
+[
+ AC_REQUIRE([gl_MATH_H_DEFAULTS])
+ ISNAND_LIBM=
+ gl_HAVE_ISNAND_NO_LIBM
+ if test $gl_cv_func_isnand_no_libm = no; then
+ gl_HAVE_ISNAND_IN_LIBM
+ if test $gl_cv_func_isnand_in_libm = yes; then
+ ISNAND_LIBM=-lm
+ fi
+ fi
+ dnl The variable gl_func_isnand set here is used by isnan.m4.
+ if test $gl_cv_func_isnand_no_libm = yes \
+ || test $gl_cv_func_isnand_in_libm = yes; then
+ gl_func_isnand=yes
+ else
+ gl_func_isnand=no
+ HAVE_ISNAND=0
+ gl_BUILD_ISNAND
+ fi
+ AC_SUBST([ISNAND_LIBM])
+])
+
+dnl Check how to get or define isnand() without linking with libm.
+
+AC_DEFUN([gl_FUNC_ISNAND_NO_LIBM],
+[
+ gl_HAVE_ISNAND_NO_LIBM
+ if test $gl_cv_func_isnand_no_libm = yes; then
+ AC_DEFINE([HAVE_ISNAND_IN_LIBC], [1],
+ [Define if the isnan(double) function is available in libc.])
+ else
+ gl_BUILD_ISNAND
+ fi
+])
+
+dnl Pull in replacement isnand definition. It does not need -lm.
+AC_DEFUN([gl_BUILD_ISNAND],
+[
+ AC_LIBOBJ([isnand])
+ gl_DOUBLE_EXPONENT_LOCATION
+])
+
+dnl Test whether isnand() can be used with libm.
+
+AC_DEFUN([gl_HAVE_ISNAND_IN_LIBM],
+[
+ AC_CACHE_CHECK([whether isnan(double) can be used with libm],
+ [gl_cv_func_isnand_in_libm],
+ [
+ save_LIBS="$LIBS"
+ LIBS="$LIBS -lm"
+ AC_TRY_LINK([#include <math.h>
+ #if __GNUC__ >= 4
+ # undef isnand
+ # define isnand(x) __builtin_isnand ((double)(x))
+ #elif defined isnan
+ # undef isnand
+ # define isnand(x) isnan ((double)(x))
+ #endif
+ double x;],
+ [return isnand (x);],
+ [gl_cv_func_isnand_in_libm=yes],
+ [gl_cv_func_isnand_in_libm=no])
+ LIBS="$save_LIBS"
+ ])
+])
+
+AC_DEFUN([gl_HAVE_ISNAND_NO_LIBM],
+[
+ AC_CACHE_CHECK([whether isnan(double) can be used without linking with libm],
+ [gl_cv_func_isnand_no_libm],
+ [
+ AC_TRY_LINK([#include <math.h>
+ #if __GNUC__ >= 4
+ # undef isnand
+ # define isnand(x) __builtin_isnan ((double)(x))
+ #else
+ # undef isnand
+ # define isnand(x) isnan ((double)(x))
+ #endif
+ double x;],
+ [return isnand (x);],
+ [gl_cv_func_isnand_no_libm=yes],
+ [gl_cv_func_isnand_no_libm=no])
+ ])
+])