linux-kernel - [PATCH] tools build: Check basic headers for test-compile feature checker

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Date:	Wed, 27 Jan 2016 11:22:22 +0000
From:	Wang Nan <wangnan0@...wei.com>
To:	<acme@...hat.com>
CC:	<linux-kernel@...r.kernel.org>, Wang Nan <wangnan0@...wei.com>,
	Jiri Olsa <jolsa@...nel.org>, Li Zefan <lizefan@...wei.com>
Subject: [PATCH] tools build: Check basic headers for test-compile feature checker

An i386 binary can be linked correctly even without correct headers.
Which causes problem. For exmaple:

 $ mv /tmp/oxygen_root/usr/include/gnu/stubs-32.h{,.bak}
 $ make tools/perf
 Auto-detecting system features:
 ...                         dwarf: [ on  ]
 [SNIP]
   GEN      common-cmds.h
   CC       perf-read-vdso32
 In file included from /tmp/oxygen_root/usr/include/features.h:388:0,
                  from /tmp/oxygen_root/usr/include/stdio.h:27,
                  from perf-read-vdso.c:1:
 /tmp/oxygen_root/usr/include/gnu/stubs.h:7:27: fatal error: gnu/stubs-32.h: No such file or directory
  # include <gnu/stubs-32.h>
                           ^
 compilation terminated.
 ...

In this patch we checks not only compiler and linker, but also basic
headers in test-compile test case, make it fail on a platform
lacking correct headers.

Signed-off-by: Wang Nan <wangnan0@...wei.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Li Zefan <lizefan@...wei.com>
---
 tools/build/feature/test-compile.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/build/feature/test-compile.c b/tools/build/feature/test-compile.c
index 31dbf45..c54e655 100644
--- a/tools/build/feature/test-compile.c
+++ b/tools/build/feature/test-compile.c
@@ -1,4 +1,6 @@
+#include <stdio.h>
 int main(void)
 {
+	printf("Hello World!\n");
 	return 0;
 }
-- 
1.8.3.4