New module 'copysignf'.

[gnulib.git] / m4 / copysignf.m4

diff --git a/m4/copysignf.m4 b/m4/copysignf.m4
new file mode 100644 (file)
index 0000000..00c1fe1
--- /dev/null
+++ b/m4/copysignf.m4
@@ -0,0 +1,19 @@
+# copysignf.m4 serial 1
+dnl Copyright (C) 2011 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.
+
+AC_DEFUN([gl_FUNC_COPYSIGNF],
+[
+  AC_REQUIRE([gl_MATH_H_DEFAULTS])
+
+  dnl Determine COPYSIGNF_LIBM.
+  gl_MATHFUNC([copysignf], [float], [(float, float)])
+  if test $gl_cv_func_copysignf_no_libm = no \
+     && test $gl_cv_func_copysignf_in_libm = no; then
+    HAVE_COPYSIGNF=0
+    COPYSIGNF_LIBM=
+  fi
+  AC_SUBST([COPYSIGNF_LIBM])
+])