Merge commit 'refs/top-bases/t/hurdsig-boot-fix' into t/hurdsig-boot-fix

1 files changed, 45 insertions, 0 deletions

diff --git a/math/w_log2_template.c b/math/w_log2_template.c
new file mode 100644
index 0000000000..e32281be65
--- /dev/null
+++ b/math/w_log2_template.c
@@ -0,0 +1,45 @@
+/* Wrapper to set errno for log2.
+   Copyright (C) 2017-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* Only build wrappers from the templates for the types that define the macro
+   below.  This macro is set in math-type-macros-<type>.h in sysdeps/generic
+   for each floating-point type.  */
+#if __USE_WRAPPER_TEMPLATE
+
+# include <errno.h>
+# include <fenv.h>
+# include <math.h>
+# include <math_private.h>
+
+FLOAT
+M_DECL_FUNC (__log2) (FLOAT x)
+{
+  if (__glibc_unlikely (islessequal (x, M_LIT (0.0))))
+    {
+      if (x == 0)
+	/* Pole error: log2(0).  */
+	__set_errno (ERANGE);
+      else
+	/* Domain error: log2(<0).  */
+	__set_errno (EDOM);
+    }
+  return M_SUF (__ieee754_log2) (x);
+}
+declare_mgen_alias (__log2, log2)
+
+#endif /* __USE_WRAPPER_TEMPLATE.  */