[PATCH] selftests/nolibc: Fix build with host headers and libc

[david.laight.linux@gmail.com]

From: David Laight <david.laight.linux@gmail.com>

Many systems don't have strlcpy() or strlcat().
Change is_nolibc to a #define so that the calls are optimised out.
Create #define wrappers so the code is syntactially valid.

Additionall readdir_r() is likely to be marked deprecated.
So disable "-Wdeprecated-declarations".

Fixes: 6fe8360b16acb  ("selftests/nolibc: also test libc-test through regular selftest framework")
Signed-off-by: David Laight <david.laight.linux@gmail.com>
---
 tools/testing/selftests/nolibc/nolibc-test.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c
index 1b9d3b2e2491..eb2421b42e75 100644
--- a/tools/testing/selftests/nolibc/nolibc-test.c
+++ b/tools/testing/selftests/nolibc/nolibc-test.c
@@ -66,13 +66,18 @@ static const char *argv0;
 /* will be used by constructor tests */
 static int constructor_test_value;
 
-static const int is_nolibc =
 #ifdef NOLIBC
-	1
+#define is_nolibc 1
 #else
-	0
+#define is_nolibc 0
+/* strlcat() and strlcpy() may not be in the system headers. */
+#undef strlcat
+#undef strlcpy
+#define strlcat(d, s, l) 0
+#define strlcpy(d, s, l) 0
+/* readdir_r() is likely to be marked deprecated */
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
 #endif
-;
 
 /* definition of a series of tests */
 struct test {
-- 
2.39.5