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.

19 files changed, 95 insertions, 34 deletions

diff --git a/ChangeLog b/ChangeLog
index 2afd2b2..ecb3b44 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,30 @@
+2015-01-05  Joseph Myers  <joseph@codesourcery.com>
+
+	[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.
+
 2015-01-05  Steve Ellcey  <sellcey@imgtec.com>
 
 	* sysdeps/mips/memcpy.S: Add support for mips32r6/mips64r6.
diff --git a/include/fenv.h b/include/fenv.h
index b29b246..0a74fa0 100644
--- a/include/fenv.h
+++ b/include/fenv.h
@@ -14,6 +14,7 @@ extern int __fegetenv (fenv_t *__envp);
 extern int __fesetenv (const fenv_t *__envp);
 extern int __feupdateenv (const fenv_t *__envp);
 extern __typeof (fegetround) __fegetround;
+extern __typeof (feholdexcept) __feholdexcept;
 
 libm_hidden_proto (feraiseexcept)
 libm_hidden_proto (__feraiseexcept)
@@ -24,6 +25,7 @@ libm_hidden_proto (__fegetround)
 libm_hidden_proto (fesetenv)
 libm_hidden_proto (fesetround)
 libm_hidden_proto (feholdexcept)
+libm_hidden_proto (__feholdexcept)
 libm_hidden_proto (feupdateenv)
 libm_hidden_proto (fetestexcept)
 libm_hidden_proto (feclearexcept)
diff --git a/math/feholdexcpt.c b/math/feholdexcpt.c
index c107daf..53cb13c 100644
--- a/math/feholdexcpt.c
+++ b/math/feholdexcpt.c
@@ -20,10 +20,12 @@
 #include <fenv.h>
 
 int
-feholdexcept (fenv_t *envp)
+__feholdexcept (fenv_t *envp)
 {
   /* No exception traps to disable and no state to save.  */
   return 0;
 }
-libm_hidden_def (feholdexcept)
+libm_hidden_def (__feholdexcept)
+weak_alias (__feholdexcept, feholdexcept)
+libm_hidden_weak (feholdexcept)
 stub_warning (feholdexcept)
diff --git a/sysdeps/aarch64/fpu/feholdexcpt.c b/sysdeps/aarch64/fpu/feholdexcpt.c
index 4198804..6c2e3f9 100644
--- a/sysdeps/aarch64/fpu/feholdexcpt.c
+++ b/sysdeps/aarch64/fpu/feholdexcpt.c
@@ -20,9 +20,11 @@
 #include <math_private.h>
 
 int
-feholdexcept (fenv_t *envp)
+__feholdexcept (fenv_t *envp)
 {
   libc_feholdexcept_aarch64 (envp);
   return 0;
 }
-libm_hidden_def (feholdexcept)
+libm_hidden_def (__feholdexcept)
+weak_alias (__feholdexcept, feholdexcept)
+libm_hidden_weak (feholdexcept)
diff --git a/sysdeps/alpha/fpu/feholdexcpt.c b/sysdeps/alpha/fpu/feholdexcpt.c
index 0cb28da..d226046 100644
--- a/sysdeps/alpha/fpu/feholdexcpt.c
+++ b/sysdeps/alpha/fpu/feholdexcpt.c
@@ -20,7 +20,7 @@
 #include <fenv_libc.h>
 
 int
-feholdexcept (fenv_t *envp)
+__feholdexcept (fenv_t *envp)
 {
   /* Save the current state.  */
   fegetenv(envp);
@@ -30,4 +30,6 @@ 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/arm/feholdexcpt.c b/sysdeps/arm/feholdexcpt.c
index ed7fc5f..9d4a724 100644
--- a/sysdeps/arm/feholdexcpt.c
+++ b/sysdeps/arm/feholdexcpt.c
@@ -21,7 +21,7 @@
 
 
 int
-feholdexcept (fenv_t *envp)
+__feholdexcept (fenv_t *envp)
 {
   /* Fail if a VFP unit isn't present.  */
   if (!ARM_HAVE_VFP)
@@ -30,4 +30,6 @@ feholdexcept (fenv_t *envp)
   libc_feholdexcept_vfp (envp);
   return 0;
 }
-libm_hidden_def (feholdexcept)
+libm_hidden_def (__feholdexcept)
+weak_alias (__feholdexcept, feholdexcept)
+libm_hidden_weak (feholdexcept)
diff --git a/sysdeps/generic/math_private.h b/sysdeps/generic/math_private.h
index 2b07f20..3a080d8 100644
--- a/sysdeps/generic/math_private.h
+++ b/sysdeps/generic/math_private.h
@@ -399,7 +399,7 @@ extern long double __gamma_productl (long double x, long double x_eps,
 static __always_inline void
 default_libc_feholdexcept (fenv_t *e)
 {
-  (void) feholdexcept (e);
+  (void) __feholdexcept (e);
 }
 
 #ifndef libc_feholdexcept
@@ -431,7 +431,7 @@ default_libc_fesetround (int r)
 static __always_inline void
 default_libc_feholdexcept_setround (fenv_t *e, int r)
 {
-  feholdexcept (e);
+  __feholdexcept (e);
   fesetround (r);
 }
 
diff --git a/sysdeps/hppa/fpu/feholdexcpt.c b/sysdeps/hppa/fpu/feholdexcpt.c
index da2f586..94eba37 100644
--- a/sysdeps/hppa/fpu/feholdexcpt.c
+++ b/sysdeps/hppa/fpu/feholdexcpt.c
@@ -21,7 +21,7 @@
 #include <string.h>
 
 int
-feholdexcept (fenv_t *envp)
+__feholdexcept (fenv_t *envp)
 {
   union { unsigned long long buf[4]; fenv_t env; } clear;
   unsigned long long *bufptr;
@@ -50,4 +50,6 @@ 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/i386/fpu/feholdexcpt.c b/sysdeps/i386/fpu/feholdexcpt.c
index 7890248..f6db2ba 100644
--- a/sysdeps/i386/fpu/feholdexcpt.c
+++ b/sysdeps/i386/fpu/feholdexcpt.c
@@ -23,7 +23,7 @@
 #include <dl-procinfo.h>
 
 int
-feholdexcept (fenv_t *envp)
+__feholdexcept (fenv_t *envp)
 {
   /* Store the environment.  Recall that fnstenv has a side effect of
      masking all exceptions.  Then clear all exceptions.  */
@@ -45,4 +45,6 @@ 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/ia64/fpu/feholdexcpt.c b/sysdeps/ia64/fpu/feholdexcpt.c
index f2738ce..6b3d69a 100644
--- a/sysdeps/ia64/fpu/feholdexcpt.c
+++ b/sysdeps/ia64/fpu/feholdexcpt.c
@@ -20,7 +20,7 @@
 #include <fenv.h>
 
 int
-feholdexcept (fenv_t *envp)
+__feholdexcept (fenv_t *envp)
 {
   fenv_t fpsr;
   /* Save the current state.  */
@@ -38,4 +38,6 @@ feholdexcept (fenv_t *envp)
   /* Success.  */
   return 0;
 }
-libm_hidden_def (feholdexcept)
+libm_hidden_def (__feholdexcept)
+weak_alias (__feholdexcept, feholdexcept)
+libm_hidden_weak (feholdexcept)
diff --git a/sysdeps/m68k/fpu/feholdexcpt.c b/sysdeps/m68k/fpu/feholdexcpt.c
index 4ebbb0c..db33c94 100644
--- a/sysdeps/m68k/fpu/feholdexcpt.c
+++ b/sysdeps/m68k/fpu/feholdexcpt.c
@@ -20,7 +20,7 @@
 #include <fenv.h>
 
 int
-feholdexcept (fenv_t *envp)
+__feholdexcept (fenv_t *envp)
 {
   fexcept_t fpcr, fpsr;
 
@@ -42,4 +42,6 @@ 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/mips/fpu/feholdexcpt.c b/sysdeps/mips/fpu/feholdexcpt.c
index 911bbe3..69e34e8 100644
--- a/sysdeps/mips/fpu/feholdexcpt.c
+++ b/sysdeps/mips/fpu/feholdexcpt.c
@@ -21,7 +21,7 @@
 #include <fpu_control.h>
 
 int
-feholdexcept (fenv_t *envp)
+__feholdexcept (fenv_t *envp)
 {
   fpu_control_t cw;
 
@@ -36,4 +36,6 @@ 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/fpu/feholdexcpt.c b/sysdeps/powerpc/fpu/feholdexcpt.c
index 080e587..f556d6d 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 dc14c07..5bb18a8 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 7a59ecc..158f91e 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)
diff --git a/sysdeps/s390/fpu/feholdexcpt.c b/sysdeps/s390/fpu/feholdexcpt.c
index 721d381..1cbe4b1 100644
--- a/sysdeps/s390/fpu/feholdexcpt.c
+++ b/sysdeps/s390/fpu/feholdexcpt.c
@@ -20,7 +20,7 @@
 #include <fenv_libc.h>
 #include <fpu_control.h>
 
-int feholdexcept (fenv_t *envp)
+int __feholdexcept (fenv_t *envp)
 {
   fexcept_t fpc;
   /* Store the environment.  */
@@ -32,4 +32,6 @@ int feholdexcept (fenv_t *envp)
   _FPU_SETCW ((fpc & ~(FE_ALL_EXCEPT << FPC_EXCEPTION_MASK_SHIFT)));
   return 0;
 }
-libm_hidden_def (feholdexcept)
+libm_hidden_def (__feholdexcept)
+weak_alias (__feholdexcept, feholdexcept)
+libm_hidden_weak (feholdexcept)
diff --git a/sysdeps/sh/sh4/fpu/feholdexcpt.c b/sysdeps/sh/sh4/fpu/feholdexcpt.c
index 47b8c1e..b2d7ed2 100644
--- a/sysdeps/sh/sh4/fpu/feholdexcpt.c
+++ b/sysdeps/sh/sh4/fpu/feholdexcpt.c
@@ -20,7 +20,7 @@
 #include <fpu_control.h>
 
 int
-feholdexcept (fenv_t *envp)
+__feholdexcept (fenv_t *envp)
 {
   fpu_control_t temp;
 
@@ -39,4 +39,6 @@ feholdexcept (fenv_t *envp)
   /* Success.  */
   return 0;
 }
-libm_hidden_def (feholdexcept)
+libm_hidden_def (__feholdexcept)
+weak_alias (__feholdexcept, feholdexcept)
+libm_hidden_weak (feholdexcept)
diff --git a/sysdeps/sparc/fpu/feholdexcpt.c b/sysdeps/sparc/fpu/feholdexcpt.c
index 0fef47a..4c9ac07 100644
--- a/sysdeps/sparc/fpu/feholdexcpt.c
+++ b/sysdeps/sparc/fpu/feholdexcpt.c
@@ -19,7 +19,7 @@
 #include <fenv.h>
 
 int
-feholdexcept (fenv_t *envp)
+__feholdexcept (fenv_t *envp)
 {
   fenv_t tmp;
 
@@ -32,4 +32,6 @@ 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/x86_64/fpu/feholdexcpt.c b/sysdeps/x86_64/fpu/feholdexcpt.c
index 010521c..615b702 100644
--- a/sysdeps/x86_64/fpu/feholdexcpt.c
+++ b/sysdeps/x86_64/fpu/feholdexcpt.c
@@ -19,7 +19,7 @@
 #include <fenv.h>
 
 int
-feholdexcept (fenv_t *envp)
+__feholdexcept (fenv_t *envp)
 {
   unsigned int mxcsr;
 
@@ -36,4 +36,6 @@ feholdexcept (fenv_t *envp)
 
   return 0;
 }
-libm_hidden_def (feholdexcept)
+libm_hidden_def (__feholdexcept)
+weak_alias (__feholdexcept, feholdexcept)
+libm_hidden_weak (feholdexcept)