perf tools build in recent kernels spews splat when cross compiling with uClibc | CC util/alias.o | In file included from tools/perf/util/../ui/../util/cache.h:8:0, | from tools/perf/util/../ui/helpline.h:7, | from tools/perf/util/debug.h:8, | from arch/../util/cpumap.h:9, | from arch/../util/env.h:5, | from arch/common.h:4, | from arch/common.c:3: | tools/include/linux/string.h:12:15: warning: redundant redeclaration of ?strlcpy? [-Wredundant-decls] | extern size_t strlcpy(char *dest, const char *src, size_t size); ^ This is after commit 61a6445e463a31 ("tools lib: Guard the strlcpy() header with __GLIBC__"). The problem is uClibc also defines __GLIBC__ for exported headers for applications. So add that specific check to not trip for uClibc. Cc: Adrian Hunter <adrian.hunter at intel.com> Cc: Alexey Brodkin <Alexey.Brodkin at synopsys.com> Cc: David Ahern <dsahern at gmail.com> Cc: Jiri Olsa <jolsa at kernel.org> Cc: Namhyung Kim <namhyung at kernel.org> Cc: Wang Nan <wangnan0 at huawei.com> Cc: Petri Gynther <pgynther at google.com> Cc: Peter Zijlstra (Intel) <peterz at infradead.org> Signed-off-by: Vineet Gupta <vgupta at synopsys.com> --- tools/include/linux/string.h | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/tools/include/linux/string.h b/tools/include/linux/string.h index b96879477311..f436d2420a18 100644 --- a/tools/include/linux/string.h +++ b/tools/include/linux/string.h @@ -8,7 +8,11 @@ void *memdup(const void *src, size_t len); int strtobool(const char *s, bool *res); -#ifdef __GLIBC__ +/* + * glibc based builds needs the extern while uClibc doesn't. + * However uClibc headers also define __GLIBC__ hence the hack below + */ +#if defined(__GLIBC__) && !defined(__UCLIBC__) extern size_t strlcpy(char *dest, const char *src, size_t size); #endif -- 2.7.4