This is the mail archive of the
libc-alpha@sourceware.org
mailing list for the glibc project.
Fix -Wundef warnings in login/tst-utmp.c
- From: Joseph Myers <joseph at codesourcery dot com>
- To: <libc-alpha at sourceware dot org>
- Date: Mon, 17 Aug 2015 16:47:49 +0000
- Subject: Fix -Wundef warnings in login/tst-utmp.c
- Authentication-results: sourceware.org; auth=none
To remove -Wno-error=undef, we need to fix the remaining cases where
there are -Wundef warnings in the testsuite. One of those places is
in login/tst-utmp.c.
When included from tst-utmpx.c, <utmpx.h> is included instead of
<utmp.h>, meaning the _HAVE_UT_* macros are not defined. The test is
prepared for them not being defined, in that all the relevant
conditionals also include "defined UTMPX". However, they test the
_HAVE_UT_* macros first, so resulting in -Wundef warnings.
This patch does the minimal fix of swapping the || operands. This is
logically correct - avoiding checking a macro we know will not be
defined in the case where it is not defined. It won't fix such
warnings for the case where the toplevel bits/utmp.h is used and most
_HAVE_UT_* aren't defined at all even when <utmp.h> is included, but
that case doesn't apply to any current glibc configuration. Fixing it
would also be tricky in that, while glibc itself consistently uses
_HAVE_UT_* in ways that would work with 0 instead of undefined,
external packages that use the macros expect defined / undefined
instead of 1 / 0 (codesearch.debian.net shows uses by util-linux,
python-utmp, libsys-utmp-perl).
Tested for x86_64.
2015-08-17 Joseph Myers <joseph@codesourcery.com>
* login/tst-utmp.c [_HAVE_UT_TYPE || defined UTMPX]: Change
conditional to [defined UTMPX || _HAVE_UT_TYPE].
[_HAVE_UT_TV || defined UTMPX]: Change conditional to [defined
UTMPX || _HAVE_UT_TV].
[_HAVE_UT_TV - 0 || defined UTMPX]: Change conditional to [defined
UTMPX || _HAVE_UT_TV - 0].
diff --git a/login/tst-utmp.c b/login/tst-utmp.c
index 2f2da90..a69a556 100644
--- a/login/tst-utmp.c
+++ b/login/tst-utmp.c
@@ -39,7 +39,7 @@
#endif
-#if _HAVE_UT_TYPE || defined UTMPX
+#if defined UTMPX || _HAVE_UT_TYPE
/* Prototype for our test function. */
static int do_test (int argc, char *argv[]);
@@ -75,7 +75,7 @@ do_prepare (int argc, char *argv[])
struct utmp entry[] =
{
-#if _HAVE_UT_TV || defined UTMPX
+#if defined UTMPX || _HAVE_UT_TV
#define UT(a) .ut_tv = { .tv_sec = (a)}
#else
#define UT(a) .ut_time = (a)
@@ -167,7 +167,7 @@ simulate_login (const char *line, const char *user)
entry[n].ut_pid = (entry_pid += 27);
entry[n].ut_type = USER_PROCESS;
strncpy (entry[n].ut_user, user, sizeof (entry[n].ut_user));
-#if _HAVE_UT_TV - 0 || defined UTMPX
+#if defined UTMPX || _HAVE_UT_TV - 0
entry[n].ut_tv.tv_sec = (entry_time += 1000);
#else
entry[n].ut_time = (entry_time += 1000);
@@ -201,7 +201,7 @@ simulate_logout (const char *line)
{
entry[n].ut_type = DEAD_PROCESS;
strncpy (entry[n].ut_user, "", sizeof (entry[n].ut_user));
-#if _HAVE_UT_TV - 0 || defined UTMPX
+#if defined UTMPX || _HAVE_UT_TV - 0
entry[n].ut_tv.tv_sec = (entry_time += 1000);
#else
entry[n].ut_time = (entry_time += 1000);
--
Joseph S. Myers
joseph@codesourcery.com