Fix string/tester.c build with GCC 8.

GCC 8 warns about more cases of string functions truncating their
output or not copying a trailing NUL byte.

This patch fixes testsuite build failures caused by such warnings in
string/tester.c.  In general, the warnings are disabled around the
relevant calls using DIAG_* macros, since the relevant cases are being
deliberately tested.  In one case, the warning is with
-Wstringop-overflow= instead of -Wstringop-truncation; in that case,
the conditional is __GNUC_PREREQ (7, 0) (being the version where
-Wstringop-overflow= was introduced), to allow the conditional to be
removed sooner, since it's harmless to disable the warning for a
GCC version where it doesn't actually occur.  In the case of warnings
for strncpy calls in test_memcmp, the calls in question are changed to
use memcpy, as they don't copy a trailing NUL and the point of that
code is to test memcmp rather than strncpy.

Tested (compilation) with GCC 8 for x86_64-linux-gnu with
build-many-glibcs.py (in conjunction with Martin's patch to allow
glibc to build).

	* string/tester.c (test_stpncpy): Disable -Wstringop-truncation
	for stpncpy calls for GCC 8.
	(test_strncat): Disable -Wstringop-truncation warning for strncat
	calls for GCC 8.  Disable -Wstringop-overflow= warning for one
	strncat call for GCC 7.
	(test_strncpy): Disable -Wstringop-truncation warning for strncpy
	calls for GCC 8.
	(test_memcmp): Use memcpy instead of strncpy for calls not copying
	trailing NUL.

1 files changed, 10 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 579185d23e..3930fd1ca4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,15 @@
 2017-11-14  Joseph Myers  <joseph@codesourcery.com>
 
+	* string/tester.c (test_stpncpy): Disable -Wstringop-truncation
+	for stpncpy calls for GCC 8.
+	(test_strncat): Disable -Wstringop-truncation warning for strncat
+	calls for GCC 8.  Disable -Wstringop-overflow= warning for one
+	strncat call for GCC 7.
+	(test_strncpy): Disable -Wstringop-truncation warning for strncpy
+	calls for GCC 8.
+	(test_memcmp): Use memcpy instead of strncpy for calls not copying
+	trailing NUL.
+
 	* string/bug-strncat1.c: Include <libc-diag.h>.
 	(main): Disable -Wstringop-truncation for strncat call for GCC 8.