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50 lines
2.1 KiB
50 lines
2.1 KiB
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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