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commit 520d437b9455560d099fe6bd9664be1f9f76868b
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Author: Siddhesh Poyarekar <siddhesh@redhat.com>
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Date: Tue Dec 3 12:26:12 2013 +0530
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[BZ #16195] Fix build warnings from systemtap probes in non-systemtap configurations
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Joseph pointed out in the bug report (and in an earlier thread) that
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systemtap probes cause build time warnings like the following:
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../sysdeps/ieee754/dbl-64/e_atan2.c:602:4: warning: the address of
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'p' will always evaluate as 'true' [-Waddress]
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due to the fact that we're now passing non-weak variables to
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LIBC_PROBE in the libm probes. This happens only on configurations
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that do not enable systemtap. The macro definition of LIBC_PROBE in
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this case only acts as a sanity checker to ensure that the number
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parameters passed to LIBC_PROBE is equal to the argument count
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parameter passed before it. This can be done in a much simpler manner
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by just adding a macro definition for each number of arguments. I am
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assuming here that we don't really want to bother with supporting
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LIBC_PROBE with an indeterminate number of arguments and if there is a
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need for a probe to have more data than what is currently supported (4
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arguments), one could simply add an additional macro here.
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diff --git a/include/stap-probe.h b/include/stap-probe.h
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index 0f65c29b2b5c5dde..0ddb5d5fc9f740dd 100644
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--- a/include/stap-probe.h
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+++ b/include/stap-probe.h
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@@ -49,13 +49,14 @@
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# ifndef __ASSEMBLER__
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/* Evaluate all the arguments and verify that N matches their number. */
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-# define LIBC_PROBE(name, n, ...) \
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- do { \
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- _Bool __libc_probe_args[] = { 0, ## __VA_ARGS__ }; \
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- _Bool __libc_probe_verify_n[(sizeof __libc_probe_args / sizeof (_Bool)) \
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- == n + 1 ? 1 : -1]; \
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- (void) __libc_probe_verify_n; \
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- } while (0)
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+#define LIBC_PROBE(name, n, ...) STAP_PROBE##n (__VA_ARGS__)
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+
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+#define STAP_PROBE0()
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+#define STAP_PROBE1(a1)
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+#define STAP_PROBE2(a1, a2)
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+#define STAP_PROBE3(a1, a2, a3)
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+#define STAP_PROBE4(a1, a2, a3, a4)
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+
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# else
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# define LIBC_PROBE(name, n, ...) /* Nothing. */
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# endif
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