Fix libm feholdexcept namespace (bug 17748).

Continuing the fixes for C90 libm functions calling C99 fe* functions,
this patch fixes the case of feholdexcept by making it a weak alias of
__feholdexcept and making the affected code call __feholdexcept.

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

	[BZ #17748]
	* include/fenv.h (__feholdexcept): Declare.  Use
	libm_hidden_proto.
	* math/feholdexcpt.c (feholdexcept): Rename to __feholdexcept and
	define as weak alias of __feholdexcept.  Use libm_hidden_weak.
	* sysdeps/aarch64/fpu/feholdexcpt.c (feholdexcept): Likewise.
	* sysdeps/alpha/fpu/feholdexcpt.c (feholdexcept): Likewise.
	* sysdeps/arm/feholdexcpt.c (feholdexcept): Likewise.
	* sysdeps/hppa/fpu/feholdexcpt.c (feholdexcept): Likewise.
	* sysdeps/i386/fpu/feholdexcpt.c (feholdexcept): Likewise.
	* sysdeps/ia64/fpu/feholdexcpt.c (feholdexcept): Likewise.
	* sysdeps/m68k/fpu/feholdexcpt.c (feholdexcept): Likewise.
	* sysdeps/mips/fpu/feholdexcpt.c (feholdexcept): Likewise.
	* sysdeps/powerpc/fpu/feholdexcpt.c (feholdexcept): Likewise.
	* sysdeps/powerpc/nofpu/feholdexcpt.c (feholdexcept): Likewise.
	* sysdeps/powerpc/powerpc32/e500/nofpu/feholdexcpt.c
	(feholdexcept): Likewise.
	* sysdeps/s390/fpu/feholdexcpt.c (feholdexcept): Likewise.
	* sysdeps/sh/sh4/fpu/feholdexcpt.c (feholdexcept): Likewise.
	* sysdeps/sparc/fpu/feholdexcpt.c (feholdexcept): Likewise.
	* sysdeps/x86_64/fpu/feholdexcpt.c (feholdexcept): Likewise.
	* sysdeps/generic/math_private.h (default_libc_feholdexcept): Use
	__feholdexcept instead of feholdexcept.
	(default_libc_feholdexcept_setround): Likewise.

3 files changed, 12 insertions, 6 deletions

diff --git a/sysdeps/powerpc/fpu/feholdexcpt.c b/sysdeps/powerpc/fpu/feholdexcpt.c
index 080e587a59..f556d6d041 100644
--- a/sysdeps/powerpc/fpu/feholdexcpt.c
+++ b/sysdeps/powerpc/fpu/feholdexcpt.c
@@ -21,7 +21,7 @@
 #define _FPU_MASK_ALL (_FPU_MASK_ZM | _FPU_MASK_OM | _FPU_MASK_UM | _FPU_MASK_XM | _FPU_MASK_IM)
 
 int
-feholdexcept (fenv_t *envp)
+__feholdexcept (fenv_t *envp)
 {
   fenv_union_t old, new;
 
@@ -46,4 +46,6 @@ feholdexcept (fenv_t *envp)
 
   return 0;
 }
-libm_hidden_def (feholdexcept)
+libm_hidden_def (__feholdexcept)
+weak_alias (__feholdexcept, feholdexcept)
+libm_hidden_weak (feholdexcept)
diff --git a/sysdeps/powerpc/nofpu/feholdexcpt.c b/sysdeps/powerpc/nofpu/feholdexcpt.c
index dc14c07c7f..5bb18a82a9 100644
--- a/sysdeps/powerpc/nofpu/feholdexcpt.c
+++ b/sysdeps/powerpc/nofpu/feholdexcpt.c
@@ -22,7 +22,7 @@
 #include "soft-supp.h"
 
 int
-feholdexcept (fenv_t *envp)
+__feholdexcept (fenv_t *envp)
 {
   fenv_union_t u;
 
@@ -40,4 +40,6 @@ feholdexcept (fenv_t *envp)
 
   return 0;
 }
-libm_hidden_def (feholdexcept)
+libm_hidden_def (__feholdexcept)
+weak_alias (__feholdexcept, feholdexcept)
+libm_hidden_weak (feholdexcept)
diff --git a/sysdeps/powerpc/powerpc32/e500/nofpu/feholdexcpt.c b/sysdeps/powerpc/powerpc32/e500/nofpu/feholdexcpt.c
index 7a59eccff9..158f91e477 100644
--- a/sysdeps/powerpc/powerpc32/e500/nofpu/feholdexcpt.c
+++ b/sysdeps/powerpc/powerpc32/e500/nofpu/feholdexcpt.c
@@ -22,7 +22,7 @@
 #include <sys/prctl.h>
 
 int
-feholdexcept (fenv_t *envp)
+__feholdexcept (fenv_t *envp)
 {
   fenv_union_t u;
   INTERNAL_SYSCALL_DECL (err);
@@ -54,4 +54,6 @@ feholdexcept (fenv_t *envp)
 
   return 0;
 }
-libm_hidden_def (feholdexcept)
+libm_hidden_def (__feholdexcept)
+weak_alias (__feholdexcept, feholdexcept)
+libm_hidden_weak (feholdexcept)