New module 'log1pf'.

* lib/math.in.h (log1pf): New declaration.
* lib/log1pf.c: New file.
* m4/log1pf.m4: New file.
* m4/math_h.m4 (gl_MATH_H): Test whether log1pf is declared.
(gl_MATH_H_DEFAULTS): Initialize GNULIB_LOG1PF, HAVE_LOG1PF,
REPLACE_LOG1PF.
* modules/math (Makefile.am): Substitute GNULIB_LOG1PF, HAVE_LOG1PF,
REPLACE_LOG1PF.
* modules/log1pf: New file.
* tests/test-math-c++.cc: Check the declaration of log1pf.
* doc/posix-functions/log1pf.texi: Mention the new module.

1 files changed, 26 insertions, 0 deletions

diff --git a/lib/log1pf.c b/lib/log1pf.c
new file mode 100644
index 0000000000..4d889faa2d
--- /dev/null
+++ b/lib/log1pf.c
@@ -0,0 +1,26 @@
+/* Natural logarithm of 1 plus argument.
+   Copyright (C) 2012 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 3 of the License, 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, see <http://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <math.h>
+
+float
+log1pf (float x)
+{
+  return (float) log1p ((double) x);
+}