From 65014ab36196f6d86edc9ee23759d6930b9d89a8 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Wed, 2 Sep 2009 14:55:55 +0200 Subject: perf tools: Work around strict aliasing related warnings Older versions of GCC are rather stupid about strict aliasing: util/trace-event-parse.c: In function 'parse_cmdlines': util/trace-event-parse.c:93: warning: dereferencing type-punned pointer will break strict-aliasing rules util/trace-event-parse.c: In function 'parse_proc_kallsyms': util/trace-event-parse.c:155: warning: dereferencing type-punned pointer will break strict-aliasing rules util/trace-event-parse.c:157: warning: dereferencing type-punned pointer will break strict-aliasing rules util/trace-event-parse.c:158: warning: dereferencing type-punned pointer will break strict-aliasing rules util/trace-event-parse.c: In function 'parse_ftrace_printk': util/trace-event-parse.c:294: warning: dereferencing type-punned pointer will break strict-aliasing rules util/trace-event-parse.c:295: warning: dereferencing type-punned pointer will break strict-aliasing rules make: *** [util/trace-event-parse.o] Error 1 Make it clear to GCC that we intend with those pointers, by passing them through via an explicit (void *) cast. We might want to add -fno-strict-aliasing as well, like the kernel itself does. Cc: Peter Zijlstra Cc: Mike Galbraith Cc: Paul Mackerras Cc: Arnaldo Carvalho de Melo Cc: Frederic Weisbecker LKML-Reference: Signed-off-by: Ingo Molnar --- tools/perf/util/trace-event-info.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'tools/perf/util/trace-event-info.c') diff --git a/tools/perf/util/trace-event-info.c b/tools/perf/util/trace-event-info.c index 81615279b876..6c9302a7274c 100644 --- a/tools/perf/util/trace-event-info.c +++ b/tools/perf/util/trace-event-info.c @@ -188,7 +188,7 @@ int bigendian(void) unsigned char str[] = { 0x1, 0x2, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0}; unsigned int *ptr; - ptr = (unsigned int *)str; + ptr = (unsigned int *)(void *)str; return *ptr == 0x01020304; } -- cgit v1.2.3-55-g7522