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authorSiddhesh Poyarekar <siddhesh@redhat.com>2013-12-03 12:26:12 +0530
committerSiddhesh Poyarekar <siddhesh@redhat.com>2013-12-03 12:26:12 +0530
commit520d437b9455560d099fe6bd9664be1f9f76868b (patch)
tree9c5ced695b6a5641628c702d7cc26b375e42004b /include/stap-probe.h
parent416e014536950a77183013fa4c86cb42dfd322a9 (diff)
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[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.
Diffstat (limited to 'include/stap-probe.h')
-rw-r--r--include/stap-probe.h15
1 files changed, 8 insertions, 7 deletions
diff --git a/include/stap-probe.h b/include/stap-probe.h
index 5f725562cb..e2963506aa 100644
--- a/include/stap-probe.h
+++ b/include/stap-probe.h
@@ -61,13 +61,14 @@
# ifndef __ASSEMBLER__
/* Evaluate all the arguments and verify that N matches their number. */
-# define LIBC_PROBE(name, n, ...) \
- do { \
- _Bool __libc_probe_args[] = { 0, ## __VA_ARGS__ }; \
- _Bool __libc_probe_verify_n[(sizeof __libc_probe_args / sizeof (_Bool)) \
- == n + 1 ? 1 : -1]; \
- (void) __libc_probe_verify_n; \
- } while (0)
+#define LIBC_PROBE(name, n, ...) STAP_PROBE##n (__VA_ARGS__)
+
+#define STAP_PROBE0()
+#define STAP_PROBE1(a1)
+#define STAP_PROBE2(a1, a2)
+#define STAP_PROBE3(a1, a2, a3)
+#define STAP_PROBE4(a1, a2, a3, a4)
+
# else
# define LIBC_PROBE(name, n, ...) /* Nothing. */
# endif