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[Bug testsuite/14531] New: gdb.base/dprintf.exp fails in newlibenvironment
- From: "yufeng.zhang at arm dot com" <sourceware-bugzilla at sourceware dot org>
- To: gdb-prs at sourceware dot org
- Date: Thu, 30 Aug 2012 17:30:57 +0000
- Subject: [Bug testsuite/14531] New: gdb.base/dprintf.exp fails in newlibenvironment
- Auto-submitted: auto-generated
http://sourceware.org/bugzilla/show_bug.cgi?id=14531
Bug #: 14531
Summary: gdb.base/dprintf.exp fails in newlib environment
Product: gdb
Version: HEAD
Status: NEW
Severity: normal
Priority: P2
Component: testsuite
AssignedTo: unassigned@sourceware.org
ReportedBy: yufeng.zhang@arm.com
Classification: Unclassified
I have seen the following failures in a bare-metal environment with newlib:
set dprintf-function fprintf^M
(gdb) PASS: gdb.base/dprintf.exp: Set dprintf function
set dprintf-channel stderr^M
(gdb) PASS: gdb.base/dprintf.exp: Set dprintf channel
jump *start^M
Line 0 is not in `foo'. Jump anyway? (y or n) y^M
Continuing at 0x400178.^M
^M
Breakpoint 2, main (argc=1, argv=0x2041bfe0) at
gdb/testsuite/gdb.base/dprintf.c:33^M
33 int loc = 1234;^M
(gdb) continue^M
Continuing.^M
kickoff 1234^M
also to stderr 1234^M
No symbol "stderr" in current context.^M
(gdb) FAIL: gdb.base/dprintf.exp: 1st dprintf, fprintf
continue^M
Continuing.^M
No symbol "stderr" in current context.^M
(gdb) FAIL: gdb.base/dprintf.exp: 2nd dprintf, fprintf
---------------------- CUT ----------------------
The reason of the failure is because that 'stderr' in the newlib has the
following definition:
#ifndef _REENT_ONLY
#define stdin (_REENT->_stdin)
#define stdout (_REENT->_stdout)
#define stderr (_REENT->_stderr)
#else /* _REENT_ONLY */
#define stdin (_impure_ptr->_stdin)
#define stdout (_impure_ptr->_stdout)
#define stderr (_impure_ptr->_stderr)
#endif /* _REENT_ONLY */
while in the GNU/Linux env, there are 'stderr's defined as both the macro and
variable:
/* Standard streams. */
extern struct _IO_FILE *stdin; /* Standard input stream. */
extern struct _IO_FILE *stdout; /* Standard output stream. */
extern struct _IO_FILE *stderr; /* Standard error output stream. */
#ifdef __STDC__
/* C89/C99 say they're macros. Make them happy. */
#define stdin stdin
#define stdout stdout
#define stderr stderr
#endif
This is probably why this test doesn't fail in GNU/Linux but newlib. I think
we need a more robust way to test 'dprintf' with 'set dprintf-function fprintf'
and 'set dprintf-channel stderr'. The C standard has specified that 'stderr'
is just a macro.
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