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meson: document why we don't generate trace events for tests/ and qga/

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Making trace generation work for tests/ and qga/ would involve some
Meson hackery to ensure we generate the trace-events files before
trace-tool uses them. Since we don't actually support tracing there
anyway, we bypass that problem.

Let's add corresponding comments.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20220126161130.3240892-7-vsementsov@virtuozzo.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
[Pasto fixed, commit message punctuation tidied up]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2022-01-26 17:11:29 +01:00 committed by Markus Armbruster
parent ff8e4827ad
commit 378dfa482d
2 changed files with 14 additions and 0 deletions
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7
qga/meson.build
View File

@ -15,6 +15,13 @@ qga_qapi_outputs = [
'qga-qapi-visit.h',
]
# Problem: to generate trace events, we'd have to add the .trace-events
# file to qapi_trace_events like we do in qapi/meson.build. Since
# qapi_trace_events is used by trace/meson.build, we'd have to move
# subdir('qga') above subdir('trace') in the top-level meson.build.
# Can't, because it would break the dependency of qga on qemuutil (which
# depends on trace_ss). Not worth solving now; simply suppress trace
# event generation instead.
qga_qapi_files = custom_target('QGA QAPI files',
output: qga_qapi_outputs,
input: 'qapi-schema.json',

7
tests/meson.build
View File

@ -31,6 +31,13 @@ test_qapi_outputs = [
'test-qapi-visit.h',
]
# Problem: to generate trace events, we'd have to add the .trace-events
# file to qapi_trace_events like we do in qapi/meson.build. Since
# qapi_trace_events is used by trace/meson.build, we'd have to move
# subdir('tests') above subdir('trace') in the top-level meson.build.
# Can't, because it would break the dependency of qga on qemuutil (which
# depends on trace_ss). Not worth solving now; simply suppress trace
# event generation instead.
test_qapi_files = custom_target('Test QAPI files',
output: test_qapi_outputs,
input: files('qapi-schema/qapi-schema-test.json',