Fix libm fesetround namespace (bug 17748).

Continuing the fixes for C90 libm functions calling C99 fe* functions,
this patch fixes the case of fesetround by making it a weak alias of
__fesetround and making the affected code call __fesetround.  An
existing __fesetround function in fenv_libc.h for powerpc is renamed
to __fesetround_inline.

Tested for x86_64 (testsuite, and that disassembly of installed shared
libraries is unchanged by the patch).  Also tested for ARM
(soft-float) that fesetround failures disappear from the linknamespace
test results (feupdateenv remains to be addressed to complete fixing
bug 17748).

	[BZ #17748]
	* include/fenv.h (__fesetround): Declare.  Use libm_hidden_proto.
	* math/fesetround.c (fesetround): Rename to __fesetround and
	define as weak alias of __fesetround.  Use libm_hidden_weak.
	* sysdeps/aarch64/fpu/fesetround.c (fesetround): Likewise.
	* sysdeps/alpha/fpu/fesetround.c (fesetround): Likewise.
	* sysdeps/arm/fesetround.c (fesetround): Likewise.
	* sysdeps/hppa/fpu/fesetround.c (fesetround): Likewise.
	* sysdeps/i386/fpu/fesetround.c (fesetround): Likewise.
	* sysdeps/ia64/fpu/fesetround.c (fesetround): Likewise.
	* sysdeps/m68k/fpu/fesetround.c (fesetround): Likewise.
	* sysdeps/mips/fpu/fesetround.c (fesetround): Likewise.
	* sysdeps/powerpc/fpu/fenv_libc.h (__fesetround): Rename to
	__fesetround_inline.
	* sysdeps/powerpc/fpu/fenv_private.h (libc_fesetround_ppc): Call
	__fesetround_inline instead of __fesetround.
	* sysdeps/powerpc/fpu/fesetround.c (fesetround): Rename to
	__fesetround and define as weak alias of __fesetround.  Use
	libm_hidden_weak.  Call __fesetround_inline instead of
	__fesetround.
	* sysdeps/powerpc/nofpu/fesetround.c (fesetround): Rename to
	__fesetround and define as weak alias of __fesetround.  Use
	libm_hidden_weak.
	* sysdeps/powerpc/powerpc32/e500/nofpu/fesetround.c (fesetround):
	Likewise.
	* sysdeps/s390/fpu/fesetround.c (fesetround): Likewise.
	* sysdeps/sh/sh4/fpu/fesetround.c (fesetround): Likewise.
	* sysdeps/sparc/fpu/fesetround.c (fesetround): Likewise.
	* sysdeps/tile/math_private.h (__fesetround): New inline function.
	* sysdeps/x86_64/fpu/fesetround.c (fesetround): Rename to
	__fesetround and define as weak alias of __fesetround.  Use
	libm_hidden_weak.
	* sysdeps/generic/math_private.h (default_libc_fesetround): Call
	__fesetround instead of fesetround.
	(default_libc_feholdexcept_setround): Likewise.
	(libc_feholdsetround_ctx): Likewise.
	(libc_feholdsetround_noex_ctx): Likewise.

19 files changed, 68 insertions, 37 deletions

diff --git a/sysdeps/aarch64/fpu/fesetround.c b/sysdeps/aarch64/fpu/fesetround.c
index 915cdd3100..257dba13db 100644
--- a/sysdeps/aarch64/fpu/fesetround.c
+++ b/sysdeps/aarch64/fpu/fesetround.c
@@ -21,7 +21,7 @@
 #include <fpu_control.h>
 
 int
-fesetround (int round)
+__fesetround (int round)
 {
   if (round & ~_FPU_FPCR_RM_MASK)
     return 1;
@@ -29,4 +29,6 @@ fesetround (int round)
   libc_fesetround_aarch64 (round);
   return 0;
 }
-libm_hidden_def (fesetround)
+libm_hidden_def (__fesetround)
+weak_alias (__fesetround, fesetround)
+libm_hidden_weak (fesetround)
diff --git a/sysdeps/alpha/fpu/fesetround.c b/sysdeps/alpha/fpu/fesetround.c
index b0c8a01de7..c17b005ede 100644
--- a/sysdeps/alpha/fpu/fesetround.c
+++ b/sysdeps/alpha/fpu/fesetround.c
@@ -20,7 +20,7 @@
 #include <fenv_libc.h>
 
 int
-fesetround (int round)
+__fesetround (int round)
 {
   unsigned long fpcr;
 
@@ -39,4 +39,6 @@ fesetround (int round)
 
   return 0;
 }
-libm_hidden_def (fesetround)
+libm_hidden_def (__fesetround)
+weak_alias (__fesetround, fesetround)
+libm_hidden_weak (fesetround)
diff --git a/sysdeps/arm/fesetround.c b/sysdeps/arm/fesetround.c
index f6a7c794e4..412311c79b 100644
--- a/sysdeps/arm/fesetround.c
+++ b/sysdeps/arm/fesetround.c
@@ -21,7 +21,7 @@
 
 
 int
-fesetround (int round)
+__fesetround (int round)
 {
   /* FE_TONEAREST is the only supported rounding mode
      if a VFP unit isn't present.  */
@@ -34,4 +34,6 @@ fesetround (int round)
   libc_fesetround_vfp (round);
   return 0;
 }
-libm_hidden_def (fesetround)
+libm_hidden_def (__fesetround)
+weak_alias (__fesetround, fesetround)
+libm_hidden_weak (fesetround)
diff --git a/sysdeps/generic/math_private.h b/sysdeps/generic/math_private.h
index 3d987383e9..24e2babd61 100644
--- a/sysdeps/generic/math_private.h
+++ b/sysdeps/generic/math_private.h
@@ -415,7 +415,7 @@ default_libc_feholdexcept (fenv_t *e)
 static __always_inline void
 default_libc_fesetround (int r)
 {
-  (void) fesetround (r);
+  (void) __fesetround (r);
 }
 
 #ifndef libc_fesetround
@@ -432,7 +432,7 @@ static __always_inline void
 default_libc_feholdexcept_setround (fenv_t *e, int r)
 {
   __feholdexcept (e);
-  fesetround (r);
+  __fesetround (r);
 }
 
 #ifndef libc_feholdexcept_setround
@@ -599,7 +599,7 @@ libc_feholdsetround_ctx (struct rm_ctx *ctx, int round)
     {
       ctx->updated_status = true;
       __fegetenv (&ctx->env);
-      fesetround (round);
+      __fesetround (round);
     }
 }
 
@@ -619,7 +619,7 @@ libc_feholdsetround_noex_ctx (struct rm_ctx *ctx, int round)
 
   /* Update rounding mode only if different.  */
   if (__glibc_unlikely (round != get_rounding_mode ()))
-    fesetround (round);
+    __fesetround (round);
 }
 
 static __always_inline void
diff --git a/sysdeps/hppa/fpu/fesetround.c b/sysdeps/hppa/fpu/fesetround.c
index 297a62a6bd..414ef9192f 100644
--- a/sysdeps/hppa/fpu/fesetround.c
+++ b/sysdeps/hppa/fpu/fesetround.c
@@ -20,7 +20,7 @@
 #include <fenv.h>
 
 int
-fesetround (int round)
+__fesetround (int round)
 {
   union { unsigned long long l; unsigned int sw[2]; } s;
 
@@ -37,4 +37,6 @@ fesetround (int round)
   return 0;
 }
 
-libm_hidden_def (fesetround)
+libm_hidden_def (__fesetround)
+weak_alias (__fesetround, fesetround)
+libm_hidden_weak (fesetround)
diff --git a/sysdeps/i386/fpu/fesetround.c b/sysdeps/i386/fpu/fesetround.c
index 3a5b7755b2..69f8b3efbd 100644
--- a/sysdeps/i386/fpu/fesetround.c
+++ b/sysdeps/i386/fpu/fesetround.c
@@ -23,7 +23,7 @@
 #include <dl-procinfo.h>
 
 int
-fesetround (int round)
+__fesetround (int round)
 {
   unsigned short int cw;
 
@@ -49,4 +49,6 @@ fesetround (int round)
 
   return 0;
 }
-libm_hidden_def (fesetround)
+libm_hidden_def (__fesetround)
+weak_alias (__fesetround, fesetround)
+libm_hidden_weak (fesetround)
diff --git a/sysdeps/ia64/fpu/fesetround.c b/sysdeps/ia64/fpu/fesetround.c
index 383e1c5b89..7fce0f7044 100644
--- a/sysdeps/ia64/fpu/fesetround.c
+++ b/sysdeps/ia64/fpu/fesetround.c
@@ -20,7 +20,7 @@
 #include <fenv.h>
 
 int
-fesetround (int round)
+__fesetround (int round)
 {
   fenv_t fpsr;
 
@@ -38,4 +38,6 @@ fesetround (int round)
 
   return 0;
 }
-libm_hidden_def (fesetround)
+libm_hidden_def (__fesetround)
+weak_alias (__fesetround, fesetround)
+libm_hidden_weak (fesetround)
diff --git a/sysdeps/m68k/fpu/fesetround.c b/sysdeps/m68k/fpu/fesetround.c
index b55ff156d4..9e6f4346c5 100644
--- a/sysdeps/m68k/fpu/fesetround.c
+++ b/sysdeps/m68k/fpu/fesetround.c
@@ -20,7 +20,7 @@
 #include <fenv.h>
 
 int
-fesetround (int round)
+__fesetround (int round)
 {
   fexcept_t fpcr;
 
@@ -35,4 +35,6 @@ fesetround (int round)
 
   return 0;
 }
-libm_hidden_def (fesetround);
+libm_hidden_def (__fesetround)
+weak_alias (__fesetround, fesetround)
+libm_hidden_weak (fesetround)
diff --git a/sysdeps/mips/fpu/fesetround.c b/sysdeps/mips/fpu/fesetround.c
index 929d373c24..61892542a3 100644
--- a/sysdeps/mips/fpu/fesetround.c
+++ b/sysdeps/mips/fpu/fesetround.c
@@ -21,7 +21,7 @@
 #include <fpu_control.h>
 
 int
-fesetround (int round)
+__fesetround (int round)
 {
   fpu_control_t cw;
 
@@ -41,4 +41,6 @@ fesetround (int round)
   return 0;
 }
 
-libm_hidden_def (fesetround)
+libm_hidden_def (__fesetround)
+weak_alias (__fesetround, fesetround)
+libm_hidden_weak (fesetround)
diff --git a/sysdeps/powerpc/fpu/fenv_libc.h b/sysdeps/powerpc/fpu/fenv_libc.h
index c52310ca2f..9118d6f4ab 100644
--- a/sysdeps/powerpc/fpu/fenv_libc.h
+++ b/sysdeps/powerpc/fpu/fenv_libc.h
@@ -76,7 +76,7 @@ typedef union
 
 
 static inline int
-__fesetround (int round)
+__fesetround_inline (int round)
 {
   if ((unsigned int) round < 2)
     {
diff --git a/sysdeps/powerpc/fpu/fenv_private.h b/sysdeps/powerpc/fpu/fenv_private.h
index 37f629f965..a87c95cdc9 100644
--- a/sysdeps/powerpc/fpu/fenv_private.h
+++ b/sysdeps/powerpc/fpu/fenv_private.h
@@ -57,7 +57,7 @@ libc_feholdexcept_ppc (fenv_t *envp)
 static __always_inline void
 libc_fesetround_ppc (int r)
 {
-  __fesetround (r);
+  __fesetround_inline (r);
 }
 
 static __always_inline void
diff --git a/sysdeps/powerpc/fpu/fesetround.c b/sysdeps/powerpc/fpu/fesetround.c
index 99404c9c11..2191852a36 100644
--- a/sysdeps/powerpc/fpu/fesetround.c
+++ b/sysdeps/powerpc/fpu/fesetround.c
@@ -21,11 +21,13 @@
 
 #undef fesetround
 int
-fesetround (int round)
+__fesetround (int round)
 {
   if ((unsigned int) round > 3)
     return 1;
   else
-    return __fesetround(round);
+    return __fesetround_inline(round);
 }
-libm_hidden_def (fesetround)
+libm_hidden_def (__fesetround)
+weak_alias (__fesetround, fesetround)
+libm_hidden_weak (fesetround)
diff --git a/sysdeps/powerpc/nofpu/fesetround.c b/sysdeps/powerpc/nofpu/fesetround.c
index c62637f3aa..96b387deb7 100644
--- a/sysdeps/powerpc/nofpu/fesetround.c
+++ b/sysdeps/powerpc/nofpu/fesetround.c
@@ -21,7 +21,7 @@
 #include "soft-supp.h"
 
 int
-fesetround (int round)
+__fesetround (int round)
 {
   if ((unsigned int) round > FE_DOWNWARD)
     return 1;
@@ -31,4 +31,6 @@ fesetround (int round)
 
   return 0;
 }
-libm_hidden_def (fesetround)
+libm_hidden_def (__fesetround)
+weak_alias (__fesetround, fesetround)
+libm_hidden_weak (fesetround)
diff --git a/sysdeps/powerpc/powerpc32/e500/nofpu/fesetround.c b/sysdeps/powerpc/powerpc32/e500/nofpu/fesetround.c
index 64b5675411..f1e57eb47e 100644
--- a/sysdeps/powerpc/powerpc32/e500/nofpu/fesetround.c
+++ b/sysdeps/powerpc/powerpc32/e500/nofpu/fesetround.c
@@ -19,7 +19,7 @@
 #include <fenv_libc.h>
 
 int
-fesetround (int round)
+__fesetround (int round)
 {
   unsigned long fpescr;
 
@@ -32,4 +32,6 @@ fesetround (int round)
 
   return 0;
 }
-libm_hidden_def (fesetround)
+libm_hidden_def (__fesetround)
+weak_alias (__fesetround, fesetround)
+libm_hidden_weak (fesetround)
diff --git a/sysdeps/s390/fpu/fesetround.c b/sysdeps/s390/fpu/fesetround.c
index 91b1a3c753..d6eedcee00 100644
--- a/sysdeps/s390/fpu/fesetround.c
+++ b/sysdeps/s390/fpu/fesetround.c
@@ -21,7 +21,7 @@
 #include <fpu_control.h>
 
 int
-fesetround (int round)
+__fesetround (int round)
 {
   if ((round|FPC_RM_MASK) != FPC_RM_MASK)
     {
@@ -34,4 +34,6 @@ fesetround (int round)
 
   return 0;
 }
-libm_hidden_def (fesetround)
+libm_hidden_def (__fesetround)
+weak_alias (__fesetround, fesetround)
+libm_hidden_weak (fesetround)
diff --git a/sysdeps/sh/sh4/fpu/fesetround.c b/sysdeps/sh/sh4/fpu/fesetround.c
index 2f7e5f73c0..0f8213e392 100644
--- a/sysdeps/sh/sh4/fpu/fesetround.c
+++ b/sysdeps/sh/sh4/fpu/fesetround.c
@@ -21,7 +21,7 @@
 #include <fpu_control.h>
 
 int
-fesetround (int round)
+__fesetround (int round)
 {
   fpu_control_t cw;
 
@@ -40,4 +40,6 @@ fesetround (int round)
 
   return 0;
 }
-libm_hidden_def (fesetround)
+libm_hidden_def (__fesetround)
+weak_alias (__fesetround, fesetround)
+libm_hidden_weak (fesetround)
diff --git a/sysdeps/sparc/fpu/fesetround.c b/sysdeps/sparc/fpu/fesetround.c
index 1ab033a86f..b01447ca7f 100644
--- a/sysdeps/sparc/fpu/fesetround.c
+++ b/sysdeps/sparc/fpu/fesetround.c
@@ -19,7 +19,7 @@
 #include <fenv.h>
 
 int
-fesetround (int round)
+__fesetround (int round)
 {
   fenv_t tmp;
 
@@ -34,4 +34,6 @@ fesetround (int round)
 
   return 0;
 }
-libm_hidden_def (fesetround)
+libm_hidden_def (__fesetround)
+weak_alias (__fesetround, fesetround)
+libm_hidden_weak (fesetround)
diff --git a/sysdeps/tile/math_private.h b/sysdeps/tile/math_private.h
index 8ff1435f17..b06e3a321d 100644
--- a/sysdeps/tile/math_private.h
+++ b/sysdeps/tile/math_private.h
@@ -37,5 +37,6 @@ extern inline int feupdateenv (const fenv_t *__e) { return 0; }
 extern inline int fegetround (void)		{ return FE_TONEAREST; }
 extern inline int __fegetround (void)		{ return FE_TONEAREST; }
 extern inline int fesetround (int __d)		{ return 0; }
+extern inline int __fesetround (int __d)	{ return 0; }
 
 #endif
diff --git a/sysdeps/x86_64/fpu/fesetround.c b/sysdeps/x86_64/fpu/fesetround.c
index 9cd5d75a86..2a9c351142 100644
--- a/sysdeps/x86_64/fpu/fesetround.c
+++ b/sysdeps/x86_64/fpu/fesetround.c
@@ -19,7 +19,7 @@
 #include <fenv.h>
 
 int
-fesetround (int round)
+__fesetround (int round)
 {
   unsigned short int cw;
   int mxcsr;
@@ -43,4 +43,6 @@ fesetround (int round)
 
   return 0;
 }
-libm_hidden_def (fesetround)
+libm_hidden_def (__fesetround)
+weak_alias (__fesetround, fesetround)
+libm_hidden_weak (fesetround)