1 files changed, 69 insertions, 0 deletions
diff --git a/m4/strtod.m4 b/m4/strtod.m4
new file mode 100644
index 000000000..8aaf4b793
--- /dev/null
+++ b/m4/strtod.m4
@@ -0,0 +1,69 @@
+## Copyright (C) 1996 Free Software Foundation, Inc.
+
+## This program is free software; you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 2, or (at your option)
+## any later version.
+
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+
+## You should have received a copy of the GNU General Public License
+## along with this program; if not, write to the Free Software
+## Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+## 02111-1307, USA.
+
+## From Jim Meyering.
+
+## serial 1
+
+## @defmac AC_FUNC_STRTOD
+## @maindex FUNC_STRTOD
+## @ovindex LIBOBJS
+## If the @code{strtod} function is not available, or does not work
+## correctly (like the one on SunOS 5.4), add @samp{strtod.o} to output
+## variable @code{LIBOBJS}.
+## @end defmac
+
+AC_DEFUN(AM_FUNC_STRTOD,
+[AC_CACHE_CHECK(for working strtod, am_cv_func_strtod,
+[AC_TRY_RUN([
+double strtod ();
+int
+main()
+{
+  {
+    /* Some versions of Linux strtod mis-parse strings with leading '+'.  */
+    char *string = " +69";
+    char *term;
+    double value;
+    value = strtod (string, &term);
+    if (value != 69 || term != (string + 4))
+      exit (1);
+  }
+
+  {
+    /* Under Solaris 2.4, strtod returns the wrong value for the
+       terminating character under some conditions.  */
+    char *string = "NaN";
+    char *term;
+    strtod (string, &term);
+    if (term != string && *(term - 1) == 0)
+      exit (1);
+  }
+  exit (0);
+}
+], am_cv_func_strtod=yes, am_cv_func_strtod=no, am_cv_func_strtod=no)])
+test $am_cv_func_strtod = no && LIBOBJS="$LIBOBJS strtod.o"
+AC_SUBST(LIBOBJS)dnl
+am_cv_func_strtod_needs_libm=no
+if test $am_cv_func_strtod = no; then
+  AC_CHECK_FUNCS(pow)
+  if test $ac_cv_func_pow = no; then
+    AC_CHECK_LIB(m, pow, [am_cv_func_strtod_needs_libm=yes],
+		 [AC_MSG_WARN(can't find library containing definition of pow)])
+  fi
+fi
+])