Make ldexpF generic.

This one is a little more tricky since it is built both for
libm and libc, and exports multiple aliases.

To simplify aliasing, a new macro is introduced which handles
aliasing to two symbols.  By default, it just applies
declare_mgen_alias to both target symbols.

Likewise, the makefile is tweaked a little to generate
templates for shared files too, and a new rule is added
to build m_*.c objects from the objpfx directory.

Verified there are no symbol or code changes using a script
to diff the *_ldexp* object files on s390x, aarch64, arm,
x86_64, and ppc64.

1 files changed, 32 insertions, 0 deletions

diff --git a/math/s_ldexp_template.c b/math/s_ldexp_template.c
new file mode 100644
index 0000000000..42a83334c3
--- /dev/null
+++ b/math/s_ldexp_template.c
@@ -0,0 +1,32 @@
+/* @(#)s_ldexp.c 5.1 93/09/24 */
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunPro, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice
+ * is preserved.
+ * ====================================================
+ */
+
+#if defined(LIBM_SCCS) && !defined(lint)
+static char rcsid[] = "$NetBSD: s_ldexp.c,v 1.6 1995/05/10 20:47:40 jtc Exp $";
+#endif
+
+#include <math.h>
+#include <math_private.h>
+#include <errno.h>
+
+FLOAT
+M_SUF (__ldexp) (FLOAT value, int exp)
+{
+	if(!isfinite(value)||value==0) return value + value;
+	value = M_SCALBN(value,exp);
+	if(!isfinite(value)||value==0) __set_errno (ERANGE);
+	return value;
+}
+
+declare_mgen_alias_2 (__ldexp, ldexp, scalbn);
+
+/* Note, versioning issues are punted to ldbl-opt in this case.  */