Fix profil_counter namespace (bug 17725).

On ARM, where profil_counter is not static, it is brought in by
references to various standard functions, as noted in
<https://sourceware.org/ml/libc-alpha/2014-11/msg00890.html>, although
it is not a standard function itself.  I don't know if this also
causes test failures on SPARC, although I see no reason for it not to
do so.

This patch fixes this namespace issue.  profil_counter is renamed to
__profil_counter and made a weak alias on ARM and SPARC.  Because of
the uses in profil.c / sprofil.c it seems simplest to make the rename
globally, including on the other architectures for which
profil_counter was static and so the change is of no substance.  The
variant names profil_counter_* used in sprofil.c are also renamed to
start with __ so that undesired function names do not get exported in
static libc.

As I noted in bug 17726, profil_counter should probably be a compat
symbol on ARM and SPARC, so it wouldn't exist at all in static libc
even as a weak alias.  Since defining a compat symbol still requires
an internal name as a target of an alias, this patch still seems
reasonable as an intermediate step towards that goal: it wouldn't be
possible for the function simply to be static profil_counter on ARM
and SPARC with profil_counter also being the exported compat symbol
name, so profil.c / sprofil.c would still need to be prepared to call
the function under another name (here, __profil_counter).

Tested for x86_64 (testsuite, and that stripped installed shared
libraries are unchanged by the patch) and ARM (ABI and linknamespace
tests - this patch reduces the number of linknamespace failures I see
on ARM from 227 to 5, the residue being math.h failures for fe*
functions and for j0l/j1n/jnl/y0l/y1l/ynl aliases).

2014-12-17  Joseph Myers  <joseph@codesourcery.com>

	[BZ #17725]
	* sysdeps/generic/profil-counter.h (profil_counter): Rename to
	__profil_counter.
	* sysdeps/unix/sysv/linux/hppa/profil-counter.h (profil_counter):
	Likewise.
	* sysdeps/unix/sysv/linux/i386/profil-counter.h (profil_counter):
	Likewise.
	* sysdeps/unix/sysv/linux/ia64/profil-counter.h (profil_counter):
	Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/profil-counter.h
	(profil_counter): Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-64/profil-counter.h
	(profil_counter): Likewise.
	* sysdeps/unix/sysv/linux/sh/profil-counter.h (profil_counter):
	Likewise.
	* sysdeps/unix/sysv/linux/tile/profil-counter.h (profil_counter):
	Likewise.
	* sysdeps/unix/sysv/linux/x86_64/profil-counter.h
	(profil_counter): Likewise.
	* sysdeps/unix/sysv/linux/arm/profil-counter.h (profil_counter):
	Likewise.
	[!__profil_counter] (profil_counter): Define as weak alias of
	__profil_counter.
	* sysdeps/unix/sysv/linux/sparc/sparc32/profil-counter.h
	(profil_counter): Rename to __profil_counter.
	[!__profil_counter] (profil_counter): Define as weak alias of
	__profil_counter.
	* sysdeps/unix/sysv/linux/sparc/sparc64/profil-counter.h
	(profil_counter): Rename to __profil_counter.
	[!__profil_counter] (profil_counter): Define as weak alias of
	__profil_counter.
	* sysdeps/posix/profil.c: Update comment referring to
	profil_counter.
	(__profil): Use __profil_counter instead of profil_counter.
	* sysdeps/posix/sprofil.c (profil_counter): Rename to
	__profil_counter.  Use __profil_counter_ushort and
	__profil_counter_uint in definitions.
	(__sprofil): Use __profil_counter_uint and __profil_counter_ushort
	instead of profil_counter_uint and profil_counter_ushort.

2 files changed, 8 insertions, 8 deletions

diff --git a/sysdeps/posix/profil.c b/sysdeps/posix/profil.c
index 54ace22537..7128cb7a8b 100644
--- a/sysdeps/posix/profil.c
+++ b/sysdeps/posix/profil.c
@@ -48,7 +48,7 @@ profil_count (void *pc)
     ++samples[i];
 }
 
-/* Get the machine-dependent definition of `profil_counter', the signal
+/* Get the machine-dependent definition of `__profil_counter', the signal
    handler for SIGPROF.  It calls `profil_count' (above) with the PC of the
    interrupted code.  */
 #include "profil-counter.h"
@@ -103,7 +103,7 @@ __profil (u_short *sample_buffer, size_t size, size_t offset, u_int scale)
   pc_offset = offset;
   pc_scale = scale;
 
-  act.sa_handler = (sighandler_t) &profil_counter;
+  act.sa_handler = (sighandler_t) &__profil_counter;
   act.sa_flags = SA_RESTART;
   __sigfillset (&act.sa_mask);
   if (__sigaction (SIGPROF, &act, oact_ptr) < 0)
diff --git a/sysdeps/posix/sprofil.c b/sysdeps/posix/sprofil.c
index 0e19d16c23..e2b7a4922b 100644
--- a/sysdeps/posix/sprofil.c
+++ b/sysdeps/posix/sprofil.c
@@ -175,17 +175,17 @@ profil_count_uint (void *pcp)
   profil_count (pcp, 1);
 }
 
-/* Get the machine-dependent definition of `profil_counter', the signal
+/* Get the machine-dependent definition of `__profil_counter', the signal
    handler for SIGPROF.  It calls `profil_count' (above) with the PC of the
    interrupted code.  */
-#define profil_counter		profil_counter_ushort
+#define __profil_counter	__profil_counter_ushort
 #define profil_count(pc)	profil_count (pc, 0)
 #include <profil-counter.h>
 
-#undef profil_counter
+#undef __profil_counter
 #undef profil_count
 
-#define profil_counter		profil_counter_uint
+#define __profil_counter	__profil_counter_uint
 #define profil_count(pc)	profil_count (pc, 1)
 #include <profil-counter.h>
 
@@ -334,9 +334,9 @@ __sprofil (struct prof *profp, int profcnt, struct timeval *tvp,
 
   /* Install SIGPROF handler.  */
   if (flags & PROF_UINT)
-    act.sa_handler = (sighandler_t) &profil_counter_uint;
+    act.sa_handler = (sighandler_t) &__profil_counter_uint;
   else
-    act.sa_handler = (sighandler_t) &profil_counter_ushort;
+    act.sa_handler = (sighandler_t) &__profil_counter_ushort;
   act.sa_flags = SA_RESTART;
   __sigfillset (&act.sa_mask);
   if (__sigaction (SIGPROF, &act, &prof_info.saved_action) < 0)