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.

9 files changed, 115 insertions, 90 deletions

diff --git a/ChangeLog b/ChangeLog
index 3223527..d68dfed 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,29 @@
+2016-09-20  Paul E. Murphy  <murphyp@linux.vnet.ibm.com>
+
+	* math/Makefile (gen-all-calls): New variable.
+	(generated): Replace gen-libm-calls with gen-all-calls.
+	(gen-libm-templates.stmp): Likewise.  Also, ensure
+	the output directory exists or is created and add
+	dependency on the Makefile.
+	(calls): Move s_ldexpF into gen-calls.
+	(gen-calls): New variable.
+
+	* math/s_ldexpf.c: Removed.
+	* math/s_ldexpl.c: Removed.
+	* math/s_ldexp.c: Refactored into ...
+	* math/s_ldexp_template.c: New file.
+
+	* sysdeps/generic/math-type-macros-double.h: Remove
+	redundant fall-through definition of declare_mgen_alias.
+	(declare_mgen_alias_2): New macro.
+
+	* sysdeps/generc/math-type-macros.h (declare_mgen_alias_2):
+	New macro for function aliased to two exported symbols.
+
+	* sysdeps/ieee754/ldbl-opt/s_ldexp.c: Update to use
+	new template file.
+	sysdeps/ieee754/ldbl-opt/s_ldexpl.c: Likewise.
+
 2016-09-20  Florian Weimer  <fweimer@redhat.com>
 
 	* Makeconfig (all-object-suffixes): Remove .og.
diff --git a/math/Makefile b/math/Makefile
index fc48960..367f73e 100644
--- a/math/Makefile
+++ b/math/Makefile
@@ -120,7 +120,8 @@ libm-routines = $(strip $(libm-support) $(libm-compat-calls)		\
 # In libm-calls (above), list m_foo in place of s_foo for any
 # routine that should be compiled separately for its libc and libm versions.
 calls = s_isinfF s_isnanF s_finiteF s_copysignF s_modfF s_scalbnF s_frexpF \
-	s_ldexpF s_signbitF
+	s_signbitF $(gen-calls)
+gen-calls = s_ldexpF
 generated += $(foreach s,.c .S,$(call type-foreach, $(calls:s_%=m_%$(s))))
 routines = $(call type-foreach, $(calls))
 
@@ -272,12 +273,15 @@ extra-objs += libieee.a ieee-math.o
 
 include ../Rules
 
-generated += $(addsuffix .c,$(call type-foreach,$(gen-libm-calls))) \
+gen-all-calls = $(gen-libm-calls) $(gen-calls)
+
+generated += $(addsuffix .c,$(call type-foreach,$(gen-all-calls))) \
 	     gen-libm-templates.stmp
 
 # Create wrappers in the math build directory.
-$(objpfx)gen-libm-templates.stmp:
-	for gcall in $(gen-libm-calls); do                                \
+$(objpfx)gen-libm-templates.stmp: Makefile
+	$(make-target-directory)
+	for gcall in $(gen-all-calls); do                                 \
 	  func=$${gcall%F*}$${gcall#*F};                                  \
 	  for type in $(foreach t,$(types),$(t)__$(type-$(t)-suffix)); do \
 	    suff=$${type#*__};                                            \
@@ -292,7 +296,7 @@ $(objpfx)gen-libm-templates.stmp:
 	echo > $(@)
 
 # Add dependency to ensure the generator runs prior.
-$(foreach t, $(call type-foreach, $(gen-libm-calls)), \
+$(foreach t, $(call type-foreach, $(gen-all-calls)), \
              $(objpfx)$(t).c): $(objpfx)gen-libm-templates.stmp
 
 ifneq (no,$(PERL))
@@ -334,6 +338,12 @@ endef
 object-suffixes-left := $(all-object-suffixes)
 include $(o-iterator)
 
+# Likewise, for those generated files shared with libc.
+define o-iterator-doit
+$(objpfx)m_%$o: $(objpfx)s_%.c $(before-compile); $$(compile-command.c)
+endef
+object-suffixes-left := $(all-object-suffixes)
+include $(o-iterator)
 
 # This file defines the default _LIB_VERSION variable that controls
 # the error return conventions for the math functions.
diff --git a/math/s_ldexp.c b/math/s_ldexp_template.c
index ee53695..42a8333 100644
--- a/math/s_ldexp.c
+++ b/math/s_ldexp_template.c
@@ -18,17 +18,15 @@ static char rcsid[] = "$NetBSD: s_ldexp.c,v 1.6 1995/05/10 20:47:40 jtc Exp $";
 #include <math_private.h>
 #include <errno.h>
 
-double __ldexp(double value, int exp)
+FLOAT
+M_SUF (__ldexp) (FLOAT value, int exp)
 {
-	if(!isfinite(value)||value==0.0) return value + value;
-	value = __scalbn(value,exp);
-	if(!isfinite(value)||value==0.0) __set_errno (ERANGE);
+	if(!isfinite(value)||value==0) return value + value;
+	value = M_SCALBN(value,exp);
+	if(!isfinite(value)||value==0) __set_errno (ERANGE);
 	return value;
 }
-weak_alias (__ldexp, ldexp)
-weak_alias (__ldexp, scalbn)
-#ifdef NO_LONG_DOUBLE
-strong_alias (__ldexp, __ldexpl)
-weak_alias (__ldexp, ldexpl)
-weak_alias (__ldexp, scalbnl)
-#endif
+
+declare_mgen_alias_2 (__ldexp, ldexp, scalbn);
+
+/* Note, versioning issues are punted to ldbl-opt in this case.  */
diff --git a/math/s_ldexpf.c b/math/s_ldexpf.c
deleted file mode 100644
index b83062f..0000000
--- a/math/s_ldexpf.c
+++ /dev/null
@@ -1,32 +0,0 @@
-/* s_ldexpf.c -- float version of s_ldexp.c.
- * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
- */
-
-/*
- * ====================================================
- * 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_ldexpf.c,v 1.3 1995/05/10 20:47:42 jtc Exp $";
-#endif
-
-#include <math.h>
-#include <math_private.h>
-#include <errno.h>
-
-float __ldexpf(float value, int exp)
-{
-	if(!isfinite(value)||value==(float)0.0) return value + value;
-	value = __scalbnf(value,exp);
-	if(!isfinite(value)||value==(float)0.0) __set_errno (ERANGE);
-	return value;
-}
-weak_alias (__ldexpf, ldexpf)
-weak_alias (__ldexpf, scalbnf)
diff --git a/math/s_ldexpl.c b/math/s_ldexpl.c
deleted file mode 100644
index 52fb093..0000000
--- a/math/s_ldexpl.c
+++ /dev/null
@@ -1,33 +0,0 @@
-/* s_ldexpl.c -- long double version of s_ldexp.c.
- * Conversion to long double by Ulrich Drepper,
- * Cygnus Support, drepper@cygnus.com.
- */
-
-/*
- * ====================================================
- * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
- *
- * Developed at SunPro, a Sun Microsystems, Inc. business.
- * Permission to use, copy, modify, and distribute this
- * software is freely granted, provided that this notice
- * is preserved.
- * ====================================================
- */
-
-#if defined(LIBM_SCCS) && !defined(lint)
-static char rcsid[] = "$NetBSD: $";
-#endif
-
-#include <math.h>
-#include <math_private.h>
-#include <errno.h>
-
-long double __ldexpl(long double value, int exp)
-{
-	if(!isfinite(value)||value==0.0) return value + value;
-	value = __scalbnl(value,exp);
-	if(!isfinite(value)||value==0.0) __set_errno (ERANGE);
-	return value;
-}
-weak_alias (__ldexpl, ldexpl)
-weak_alias (__ldexpl, scalbnl)
diff --git a/sysdeps/generic/math-type-macros-double.h b/sysdeps/generic/math-type-macros-double.h
index 154f416..284a6a4 100644
--- a/sysdeps/generic/math-type-macros-double.h
+++ b/sysdeps/generic/math-type-macros-double.h
@@ -34,9 +34,13 @@
    weak_alias (from, to)		    \
    strong_alias (from, from ## l)	    \
    weak_alias (from, to ## l)
-#elif !defined declare_mgen_alias
-# define declare_mgen_alias(from, to)	    \
-   weak_alias (M_SUF (from), M_SUF (to))
+#endif
+
+#if defined NO_LONG_DOUBLE && !defined declare_mgen_alias_2
+# define declare_mgen_alias_2(from, to, to2) \
+   declare_mgen_alias (from, to)	     \
+   weak_alias (from, to2)		     \
+   weak_alias (from, to2 ## l)
 #endif
 
 /* Supply the generic macros.  */
diff --git a/sysdeps/generic/math-type-macros.h b/sysdeps/generic/math-type-macros.h
index 259cb94..bd9e25a 100644
--- a/sysdeps/generic/math-type-macros.h
+++ b/sysdeps/generic/math-type-macros.h
@@ -38,6 +38,11 @@
       This exposes the appropriate symbol(s) for a
       function f of type FLOAT.
 
+  declare_mgen_alias_2(from,to,to2)
+      This exposes the appropriate symbol(s) for a
+      function f of type FLOAT when it is aliased
+      to two symbols.
+
   M_LIBM_NEED_COMPAT(func)
       This is utilized in macro context to indicate
       whether func should declare compat symbols.
@@ -112,6 +117,13 @@
 # define declare_mgen_alias(from, to) weak_alias (M_SUF (from), M_SUF (to))
 #endif
 
+/* Likewise, if two aliases are derived from the same symbol.  */
+#ifndef declare_mgen_alias_2
+# define declare_mgen_alias_2(from, to, to2)  \
+ declare_mgen_alias (from, to)		      \
+ declare_mgen_alias (from, to2)
+#endif
+
 /* Do not generate anything for compat symbols by default.  */
 #ifndef M_LIBM_NEED_COMPAT
 # define M_LIBM_NEED_COMPAT(func) 0
diff --git a/sysdeps/ieee754/ldbl-opt/s_ldexp.c b/sysdeps/ieee754/ldbl-opt/s_ldexp.c
index 20e107b..65f96e0 100644
--- a/sysdeps/ieee754/ldbl-opt/s_ldexp.c
+++ b/sysdeps/ieee754/ldbl-opt/s_ldexp.c
@@ -1,5 +1,26 @@
-#include <math_ldbl_opt.h>
-#include <math/s_ldexp.c>
+/* ldexp alias overrides for platforms where long double
+   was previously not unique.
+   Copyright (C) 2016 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/>.  */
+
+#define M_LIBM_NEED_COMPAT(f) 0
+#include <math-type-macros-double.h>
+#include <s_ldexp_template.c>
+
 #if IS_IN (libm)
 # if LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)
 compat_symbol (libm, __ldexp, ldexpl, GLIBC_2_0);
diff --git a/sysdeps/ieee754/ldbl-opt/s_ldexpl.c b/sysdeps/ieee754/ldbl-opt/s_ldexpl.c
index ed87a92..7a26437 100644
--- a/sysdeps/ieee754/ldbl-opt/s_ldexpl.c
+++ b/sysdeps/ieee754/ldbl-opt/s_ldexpl.c
@@ -1,7 +1,26 @@
-#include <math_ldbl_opt.h>
-#undef weak_alias
-#define weak_alias(n,a)
-#include <math/s_ldexpl.c>
+/* ldexpl alias overrides for platforms where long double
+   was previously not unique.
+   Copyright (C) 2016 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/>.  */
+
+#define declare_mgen_alias(f,t)
+#include <math-type-macros-ldouble.h>
+#include <s_ldexp_template.c>
+
 strong_alias (__ldexpl, __ldexpl_2)
 #if IS_IN (libm)
 long_double_symbol (libm, __ldexpl, ldexpl);