Make drem an alias of remainder (bug 16171).

The libm drem functions just call the corresponding __remainder
functions.  This patch removes the unnecessary wrappers by making them
into weak aliases at the ELF level.

Tested for x86_64, x86, mips64 and powerpc.

	[BZ #16171]
	* math/w_remainder.c (drem): Define as weak alias of __remainder.
	[NO_LONG_DOUBLE] (dreml): Define as weak alias of __remainder.
	* math/w_remainderf.c (dremf): Define as weak alias of
	__remainderf.
	* math/w_remainderl.c (dreml): Define as weak alias of
	__remainderl.
	* sysdeps/ia64/fpu/e_remainder.S (drem): Define as weak alias of
	__remainder.
	* sysdeps/ia64/fpu/e_remainderf.S (dremf): Define as weak alias of
	__remainderf.
	* sysdeps/ia64/fpu/e_remainderl.S (dreml): Define as weak alias of
	__remainderl.
	* sysdeps/ieee754/ldbl-opt/nldbl-remainder.c (dreml): Define as
	weak alias of remainderl.
	* sysdeps/ieee754/ldbl-opt/w_remainder.c
	[LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)] (__drem): Define as strong
	alias of __remainder.
	[LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)] (dreml): Use compat_symbol.
	* sysdeps/ieee754/ldbl-opt/w_remainderl.c (__dreml): Define as
	strong alias of __remainderl.
	(dreml): Use long_double_symbol.
	* math/Makefile (libm-calls): Remove w_drem.
	* sysdeps/ieee754/ldbl-opt/Makefile (libnldbl-calls): Remove drem.
	(CFLAGS-nldbl-drem.c): Remove variable.
	(CFLAGS-nldbl-remainder.c): Add -fno-builtin-dreml.
	* math/w_drem.c: Remove file.
	* math/w_dremf.c: Likewise.
	* math/w_dreml.c: Likewise.
	* sysdeps/ieee754/ldbl-opt/nldbl-drem.c: Likewise.
	* sysdeps/ieee754/ldbl-opt/w_drem.c: Likewise.
	* sysdeps/ieee754/ldbl-opt/w_dreml.c: Likewise.

19 files changed, 61 insertions, 86 deletions

diff --git a/ChangeLog b/ChangeLog
index ab88beee2c..e938a5338f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,38 @@
 2015-10-29  Joseph Myers  <joseph@codesourcery.com>
 
+	[BZ #16171]
+	* math/w_remainder.c (drem): Define as weak alias of __remainder.
+	[NO_LONG_DOUBLE] (dreml): Define as weak alias of __remainder.
+	* math/w_remainderf.c (dremf): Define as weak alias of
+	__remainderf.
+	* math/w_remainderl.c (dreml): Define as weak alias of
+	__remainderl.
+	* sysdeps/ia64/fpu/e_remainder.S (drem): Define as weak alias of
+	__remainder.
+	* sysdeps/ia64/fpu/e_remainderf.S (dremf): Define as weak alias of
+	__remainderf.
+	* sysdeps/ia64/fpu/e_remainderl.S (dreml): Define as weak alias of
+	__remainderl.
+	* sysdeps/ieee754/ldbl-opt/nldbl-remainder.c (dreml): Define as
+	weak alias of remainderl.
+	* sysdeps/ieee754/ldbl-opt/w_remainder.c
+	[LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)] (__drem): Define as strong
+	alias of __remainder.
+	[LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)] (dreml): Use compat_symbol.
+	* sysdeps/ieee754/ldbl-opt/w_remainderl.c (__dreml): Define as
+	strong alias of __remainderl.
+	(dreml): Use long_double_symbol.
+	* math/Makefile (libm-calls): Remove w_drem.
+	* sysdeps/ieee754/ldbl-opt/Makefile (libnldbl-calls): Remove drem.
+	(CFLAGS-nldbl-drem.c): Remove variable.
+	(CFLAGS-nldbl-remainder.c): Add -fno-builtin-dreml.
+	* math/w_drem.c: Remove file.
+	* math/w_dremf.c: Likewise.
+	* math/w_dreml.c: Likewise.
+	* sysdeps/ieee754/ldbl-opt/nldbl-drem.c: Likewise.
+	* sysdeps/ieee754/ldbl-opt/w_drem.c: Likewise.
+	* sysdeps/ieee754/ldbl-opt/w_dreml.c: Likewise.
+
 	* sysdeps/i386/configure.ac (cpuid.h): Do not test for header.
 	* sysdeps/i386/configure: Regenerated.
 	* sysdeps/x86_64/configure.ac (cpuid.h): Do not test for header.
diff --git a/NEWS b/NEWS
index 0831d35881..ae89162d81 100644
--- a/NEWS
+++ b/NEWS
@@ -10,18 +10,18 @@ Version 2.23
 * The following bugs are resolved with this release:
 
   887, 2542, 2543, 2558, 2898, 4404, 6803, 10432, 14341, 14912, 15367,
-  15384, 15470, 15491, 15786, 15918, 16068, 16141, 16296, 16347, 16399,
-  16415, 16422, 16517, 16519, 16520, 16521, 16620, 16734, 16973, 16985,
-  17118, 17243, 17244, 17250, 17404, 17441, 17787, 17886, 17887, 17905,
-  18084, 18086, 18240, 18265, 18370, 18421, 18480, 18525, 18595, 18589,
-  18610, 18611, 18618, 18647, 18661, 18674, 18675, 18681, 18699, 18724,
-  18743, 18757, 18778, 18781, 18787, 18789, 18790, 18795, 18796, 18803,
-  18820, 18823, 18824, 18825, 18857, 18863, 18870, 18872, 18873, 18875,
-  18887, 18918, 18921, 18928, 18951, 18952, 18953, 18956, 18961, 18966,
-  18967, 18969, 18970, 18977, 18980, 18981, 18982, 18985, 19003, 19007,
-  19012, 19016, 19018, 19032, 19046, 19048, 19049, 19050, 19059, 19071,
-  19074, 19076, 19077, 19078, 19079, 19085, 19086, 19088, 19094, 19095,
-  19124, 19125, 19129, 19134, 19137, 19156, 19174, 19181.
+  15384, 15470, 15491, 15786, 15918, 16068, 16141, 16171, 16296, 16347,
+  16399, 16415, 16422, 16517, 16519, 16520, 16521, 16620, 16734, 16973,
+  16985, 17118, 17243, 17244, 17250, 17404, 17441, 17787, 17886, 17887,
+  17905, 18084, 18086, 18240, 18265, 18370, 18421, 18480, 18525, 18595,
+  18589, 18610, 18611, 18618, 18647, 18661, 18674, 18675, 18681, 18699,
+  18724, 18743, 18757, 18778, 18781, 18787, 18789, 18790, 18795, 18796,
+  18803, 18820, 18823, 18824, 18825, 18857, 18863, 18870, 18872, 18873,
+  18875, 18887, 18918, 18921, 18928, 18951, 18952, 18953, 18956, 18961,
+  18966, 18967, 18969, 18970, 18977, 18980, 18981, 18982, 18985, 19003,
+  19007, 19012, 19016, 19018, 19032, 19046, 19048, 19049, 19050, 19059,
+  19071, 19074, 19076, 19077, 19078, 19079, 19085, 19086, 19088, 19094,
+  19095, 19124, 19125, 19129, 19134, 19137, 19156, 19174, 19181.
 
 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
   glibc 2.10 via --enable-experimental-malloc (2009), could result in the
diff --git a/math/Makefile b/math/Makefile
index dedd7ee5ea..3efbc58d5c 100644
--- a/math/Makefile
+++ b/math/Makefile
@@ -51,7 +51,7 @@ libm-calls = e_acos e_acosh e_asin e_atan2 e_atanh e_cosh e_exp e_fmod	\
 	     s_floor s_log1p w_log1p s_logb				\
 	     s_nextafter s_nexttoward s_rint s_scalbln w_scalbln	\
 	     s_significand s_sin s_tan s_tanh w_acos w_acosh w_asin	\
-	     w_atan2 w_atanh w_cosh w_drem w_exp w_exp2 w_exp10 w_fmod	\
+	     w_atan2 w_atanh w_cosh w_exp w_exp2 w_exp10 w_fmod		\
 	     w_tgamma w_hypot w_j0 w_j1 w_jn w_lgamma w_lgamma_r	\
 	     w_log w_log10 w_pow w_remainder w_scalb w_sinh w_sqrt	\
 	     w_ilogb							\
diff --git a/math/w_drem.c b/math/w_drem.c
deleted file mode 100644
index 843b67aa80..0000000000
--- a/math/w_drem.c
+++ /dev/null
@@ -1,19 +0,0 @@
-/*
- * drem() wrapper for remainder().
- *
- * Written by J.T. Conklin, <jtc@wimsey.com>
- * Placed into the Public Domain, 1994.
- */
-
-#include <math.h>
-
-double
-__drem (double x, double y)
-{
-	return __remainder(x, y);
-}
-weak_alias (__drem, drem)
-#ifdef NO_LONG_DOUBLE
-strong_alias (__drem, __dreml)
-weak_alias (__drem, dreml)
-#endif
diff --git a/math/w_dremf.c b/math/w_dremf.c
deleted file mode 100644
index c5e7c63af5..0000000000
--- a/math/w_dremf.c
+++ /dev/null
@@ -1,16 +0,0 @@
-/*
- * dremf() wrapper for remainderf().
- *
- * Written by J.T. Conklin, <jtc@wimsey.com>
- * Placed into the Public Domain, 1994.
- */
-
-#include <math.h>
-#include <math_private.h>
-
-float
-__dremf (float x, float y)
-{
-	return __remainderf(x, y);
-}
-weak_alias (__dremf, dremf)
diff --git a/math/w_dreml.c b/math/w_dreml.c
deleted file mode 100644
index 8d0139ac28..0000000000
--- a/math/w_dreml.c
+++ /dev/null
@@ -1,17 +0,0 @@
-/*
- * dreml() wrapper for remainderl().
- *
- * Written by J.T. Conklin, <jtc@wimsey.com>
- * Conversion to long double by Ulrich Drepper,
- * Cygnus Support, drepper@cygnus.com.
- * Placed into the Public Domain, 1994.
- */
-
-#include <math.h>
-
-long double
-__dreml (long double x, long double y)
-{
-	return __remainderl(x, y);
-}
-weak_alias (__dreml, dreml)
diff --git a/math/w_remainder.c b/math/w_remainder.c
index a6da1921dc..aa70f0213f 100644
--- a/math/w_remainder.c
+++ b/math/w_remainder.c
@@ -32,7 +32,9 @@ __remainder (double x, double y)
   return __ieee754_remainder (x, y);
 }
 weak_alias (__remainder, remainder)
+weak_alias (__remainder, drem)
 #ifdef NO_LONG_DOUBLE
 strong_alias (__remainder, __remainderl)
 weak_alias (__remainder, remainderl)
+weak_alias (__remainder, dreml)
 #endif
diff --git a/math/w_remainderf.c b/math/w_remainderf.c
index c003002287..beb07756c5 100644
--- a/math/w_remainderf.c
+++ b/math/w_remainderf.c
@@ -32,3 +32,4 @@ __remainderf (float x, float y)
   return __ieee754_remainderf (x, y);
 }
 weak_alias (__remainderf, remainderf)
+weak_alias (__remainderf, dremf)
diff --git a/math/w_remainderl.c b/math/w_remainderl.c
index b25929d16e..393c99aad0 100644
--- a/math/w_remainderl.c
+++ b/math/w_remainderl.c
@@ -32,3 +32,4 @@ __remainderl (long double x, long double y)
   return __ieee754_remainderl (x, y);
 }
 weak_alias (__remainderl, remainderl)
+weak_alias (__remainderl, dreml)
diff --git a/sysdeps/ia64/fpu/e_remainder.S b/sysdeps/ia64/fpu/e_remainder.S
index 3e065171b3..3cd5aac578 100644
--- a/sysdeps/ia64/fpu/e_remainder.S
+++ b/sysdeps/ia64/fpu/e_remainder.S
@@ -529,6 +529,7 @@ EXP_ERROR_RETURN:
 }
 
 GLOBAL_IEEE754_END(remainder)
+weak_alias (__remainder, drem)
 
 
 
diff --git a/sysdeps/ia64/fpu/e_remainderf.S b/sysdeps/ia64/fpu/e_remainderf.S
index 2d7385d568..df4cfdddc8 100644
--- a/sysdeps/ia64/fpu/e_remainderf.S
+++ b/sysdeps/ia64/fpu/e_remainderf.S
@@ -548,6 +548,7 @@ EXP_ERROR_RETURN:
 }
 
 GLOBAL_IEEE754_END(remainderf)
+weak_alias (__remainderf, dremf)
 
 
 
diff --git a/sysdeps/ia64/fpu/e_remainderl.S b/sysdeps/ia64/fpu/e_remainderl.S
index 30658e5487..d9a9ee8d29 100644
--- a/sysdeps/ia64/fpu/e_remainderl.S
+++ b/sysdeps/ia64/fpu/e_remainderl.S
@@ -557,6 +557,7 @@ EXP_ERROR_RETURN:
 }
 
 GLOBAL_IEEE754_END(remainderl)
+weak_alias (__remainderl, dreml)
 
 LOCAL_LIBM_ENTRY(__libm_error_region)
 .prologue
diff --git a/sysdeps/ieee754/ldbl-opt/Makefile b/sysdeps/ieee754/ldbl-opt/Makefile
index 222122de0b..53091e410c 100644
--- a/sysdeps/ieee754/ldbl-opt/Makefile
+++ b/sysdeps/ieee754/ldbl-opt/Makefile
@@ -31,7 +31,7 @@ libnldbl-calls = asprintf dprintf fprintf fscanf fwprintf fwscanf iovfscanf \
 		 tanh acosh asinh atanh exp log log10 exp10 pow10 expm1 \
 		 log1p logb exp2 sqrt cbrt fabs floor j0 j1 y0 y1 erf erfc \
 		 lgamma tgamma gamma rint nearbyint round trunc \
-		 copysign fdim fmax fmin nextafter pow hypot fmod drem \
+		 copysign fdim fmax fmin nextafter pow hypot fmod \
 		 remainder ldexp scalbn frexp modf scalbln fma nan sincos \
 		 jn yn ilogb remquo lrint lround llrint llround nexttowardf \
 		 nexttoward conj cacos cacosh casin catan catanh ccos ccosh \
@@ -81,7 +81,6 @@ CFLAGS-nldbl-csinh.c = -fno-builtin-csinhl
 CFLAGS-nldbl-csqrt.c = -fno-builtin-csqrtl
 CFLAGS-nldbl-ctan.c = -fno-builtin-ctanl
 CFLAGS-nldbl-ctanh.c = -fno-builtin-ctanhl
-CFLAGS-nldbl-drem.c = -fno-builtin-dreml
 CFLAGS-nldbl-erf.c = -fno-builtin-erfl
 CFLAGS-nldbl-erfc.c = -fno-builtin-erfcl
 CFLAGS-nldbl-exp.c = -fno-builtin-expl
@@ -125,7 +124,7 @@ CFLAGS-nldbl-nexttoward.c = -fno-builtin-nexttoward -fno-builtin-nexttowardl
 CFLAGS-nldbl-nexttowardf.c = -fno-builtin-nexttowardf
 CFLAGS-nldbl-pow.c = -fno-builtin-powl
 CFLAGS-nldbl-pow10.c = -fno-builtin-pow10l
-CFLAGS-nldbl-remainder.c = -fno-builtin-remainderl
+CFLAGS-nldbl-remainder.c = -fno-builtin-remainderl -fno-builtin-dreml
 CFLAGS-nldbl-remquo.c = -fno-builtin-remquol
 CFLAGS-nldbl-rint.c = -fno-builtin-rintl
 CFLAGS-nldbl-round.c = -fno-builtin-roundl
diff --git a/sysdeps/ieee754/ldbl-opt/nldbl-drem.c b/sysdeps/ieee754/ldbl-opt/nldbl-drem.c
deleted file mode 100644
index 1e08ce1d28..0000000000
--- a/sysdeps/ieee754/ldbl-opt/nldbl-drem.c
+++ /dev/null
@@ -1,8 +0,0 @@
-#include "nldbl-compat.h"
-
-double
-attribute_hidden
-dreml (double x, double y)
-{
-  return drem (x, y);
-}
diff --git a/sysdeps/ieee754/ldbl-opt/nldbl-remainder.c b/sysdeps/ieee754/ldbl-opt/nldbl-remainder.c
index a8d5bafb5f..581dc78a4d 100644
--- a/sysdeps/ieee754/ldbl-opt/nldbl-remainder.c
+++ b/sysdeps/ieee754/ldbl-opt/nldbl-remainder.c
@@ -6,3 +6,5 @@ remainderl (double x, double y)
 {
   return remainder (x, y);
 }
+extern __typeof (remainderl) dreml attribute_hidden;
+weak_alias (remainderl, dreml)
diff --git a/sysdeps/ieee754/ldbl-opt/w_drem.c b/sysdeps/ieee754/ldbl-opt/w_drem.c
deleted file mode 100644
index 788a5d29d6..0000000000
--- a/sysdeps/ieee754/ldbl-opt/w_drem.c
+++ /dev/null
@@ -1,5 +0,0 @@
-#include <math_ldbl_opt.h>
-#include <math/w_drem.c>
-#if LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)
-compat_symbol (libm, __drem, dreml, GLIBC_2_0);
-#endif
diff --git a/sysdeps/ieee754/ldbl-opt/w_dreml.c b/sysdeps/ieee754/ldbl-opt/w_dreml.c
deleted file mode 100644
index d14d7e202c..0000000000
--- a/sysdeps/ieee754/ldbl-opt/w_dreml.c
+++ /dev/null
@@ -1,5 +0,0 @@
-#include <math_ldbl_opt.h>
-#undef weak_alias
-#define weak_alias(n,a)
-#include <math/w_dreml.c>
-long_double_symbol (libm, __dreml, dreml);
diff --git a/sysdeps/ieee754/ldbl-opt/w_remainder.c b/sysdeps/ieee754/ldbl-opt/w_remainder.c
index 94d98930f4..dfa7b7f569 100644
--- a/sysdeps/ieee754/ldbl-opt/w_remainder.c
+++ b/sysdeps/ieee754/ldbl-opt/w_remainder.c
@@ -2,4 +2,6 @@
 #include <math/w_remainder.c>
 #if LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)
 compat_symbol (libm, __remainder, remainderl, GLIBC_2_0);
+strong_alias (__remainder, __drem)
+compat_symbol (libm, __drem, dreml, GLIBC_2_0);
 #endif
diff --git a/sysdeps/ieee754/ldbl-opt/w_remainderl.c b/sysdeps/ieee754/ldbl-opt/w_remainderl.c
index e450a25bbc..7a344b7709 100644
--- a/sysdeps/ieee754/ldbl-opt/w_remainderl.c
+++ b/sysdeps/ieee754/ldbl-opt/w_remainderl.c
@@ -3,3 +3,5 @@
 #define weak_alias(n,a)
 #include <math/w_remainderl.c>
 long_double_symbol (libm, __remainderl, remainderl);
+strong_alias (__remainderl, __dreml)
+long_double_symbol (libm, __dreml, dreml);