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Fix -Wundef warnings in login/tst-utmp.c.

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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.

	* 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].
This commit is contained in:
Joseph Myers 2015-08-19 00:50:17 +00:00
parent 87336caeb5
commit ccb729df47
2 changed files with 13 additions and 4 deletions
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9
ChangeLog
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@ -1,3 +1,12 @@
2015-08-19 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].
2015-08-18 Joseph Myers <joseph@codesourcery.com> 2015-08-18 Joseph Myers <joseph@codesourcery.com>
* sysdeps/mips/dl-machine.h [__mips_isa_rev < 6]: Change * sysdeps/mips/dl-machine.h [__mips_isa_rev < 6]: Change

8
login/tst-utmp.c
View File

@ -39,7 +39,7 @@
#endif #endif
#if _HAVE_UT_TYPE || defined UTMPX #if defined UTMPX || _HAVE_UT_TYPE
/* Prototype for our test function. */ /* Prototype for our test function. */
static int do_test (int argc, char *argv[]); static int do_test (int argc, char *argv[]);
@ -75,7 +75,7 @@ do_prepare (int argc, char *argv[])
struct utmp entry[] = struct utmp entry[] =
{ {
#if _HAVE_UT_TV || defined UTMPX #if defined UTMPX || _HAVE_UT_TV
#define UT(a) .ut_tv = { .tv_sec = (a)} #define UT(a) .ut_tv = { .tv_sec = (a)}
#else #else
#define UT(a) .ut_time = (a) #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_pid = (entry_pid += 27);
entry[n].ut_type = USER_PROCESS; entry[n].ut_type = USER_PROCESS;
strncpy (entry[n].ut_user, user, sizeof (entry[n].ut_user)); 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); entry[n].ut_tv.tv_sec = (entry_time += 1000);
#else #else
entry[n].ut_time = (entry_time += 1000); entry[n].ut_time = (entry_time += 1000);
@ -201,7 +201,7 @@ simulate_logout (const char *line)
{ {
entry[n].ut_type = DEAD_PROCESS; entry[n].ut_type = DEAD_PROCESS;
strncpy (entry[n].ut_user, "", sizeof (entry[n].ut_user)); 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); entry[n].ut_tv.tv_sec = (entry_time += 1000);
#else #else
entry[n].ut_time = (entry_time += 1000); entry[n].ut_time = (entry_time += 1000);