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trace: skip qemu_set_log_filename if no "-D" option was passed

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When the "simple" backend is not active but the "log" backend is,
both "-trace file=" and "-D" will result in a call to
qemu_set_log_filename.  Unfortunately, QEMU was also calling
qemu_set_log_filename if "-D" was not passed, so the "-trace
file=" option had no effect and the tracepoints went back to
stderr.

Fortunately we can just skip qemu_set_log_filename in that case,
because the log backend will initialize itself just fine as soon
as qemu_set_log is called, also in qemu_process_early_options.

Cc: stefanha@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210209145759.141231-3-pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2021-02-09 15:57:59 +01:00
parent 9f45a64109
commit 7520c4f084
1 changed files with 3 additions and 1 deletions
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4
softmmu/vl.c
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@ -2364,7 +2364,9 @@ static void qemu_process_early_options(void)
#endif
/* Open the logfile at this point and set the log mask if necessary. */
qemu_set_log_filename(log_file, &error_fatal);
if (log_file) {
qemu_set_log_filename(log_file, &error_fatal);
}
if (log_mask) {
int mask;
mask = qemu_str_to_log_mask(log_mask);