[BZ #16195] Fix build warnings from systemtap probes in non-systemtap configurations

Joseph pointed out in the bug report (and in an earlier thread) that
systemtap probes cause build time warnings like the following:

    ../sysdeps/ieee754/dbl-64/e_atan2.c:602:4: warning: the address of
    'p' will always evaluate as 'true' [-Waddress]

due to the fact that we're now passing non-weak variables to
LIBC_PROBE in the libm probes.  This happens only on configurations
that do not enable systemtap.  The macro definition of LIBC_PROBE in
this case only acts as a sanity checker to ensure that the number
parameters passed to LIBC_PROBE is equal to the argument count
parameter passed before it.  This can be done in a much simpler manner
by just adding a macro definition for each number of arguments.  I am
assuming here that we don't really want to bother with supporting
LIBC_PROBE with an indeterminate number of arguments and if there is a
need for a probe to have more data than what is currently supported (4
arguments), one could simply add an additional macro here.

1 files changed, 11 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index de634b4d41..182051a727 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,14 @@
+2013-12-03  Siddhesh Poyarekar  <siddhesh@redhat.com>
+
+	[BZ #16195]
+	* include/stap-probe.h [!USE_STAP_PROBE && !__ASSEMBLER__]
+	(LIBC_PROBE): Change definition to call STAP_PROBE* macros.
+	(STAP_PROBE0): New macro.
+	(STAP_PROBE1): Likewise.
+	(STAP_PROBE2): Likewise.
+	(STAP_PROBE3): Likewise.
+	(STAP_PROBE4): Likewise.
+
 2013-12-02  Ondřej Bílka  <neleai@seznam.cz>
 
 	* manual/llio.texi (Memory-mapped I/O): Add shm_open and shm_close.