[PATCH 1/9] tools include linux: Guard against redefinition of some macros

From: Arnaldo Carvalho de Melo
Date: Tue Sep 12 2017 - 15:25:05 EST

From: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>

When cross building to android r15c (and older versions) on Fedora 26
we notice these:

/opt/android-ndk-r15c/platforms/android-24/arch-arm/usr/include/sys/cdefs.h:332:0: note: this is the location of the previous definition

For __aligned, __packed and __noreturn, so guard those with ifdefs to
avoid drowning useful warnings in these.

Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-d7w3fa9c22dtmrwbedos6ie1@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
tools/include/linux/compiler-gcc.h | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/tools/include/linux/compiler-gcc.h b/tools/include/linux/compiler-gcc.h
index bd39b2090ad1..3723b9f8f964 100644
--- a/tools/include/linux/compiler-gcc.h
+++ b/tools/include/linux/compiler-gcc.h
@@ -21,11 +21,14 @@
#define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))

#define noinline __attribute__((noinline))
+#ifndef __packed
#define __packed __attribute__((packed))
+#ifndef __noreturn
#define __noreturn __attribute__((noreturn))
+#ifndef __aligned
#define __aligned(x) __attribute__((aligned(x)))
#define __printf(a, b) __attribute__((format(printf, a, b)))
#define __scanf(a, b) __attribute__((format(scanf, a, b)))