Fix compilation with QT_NAMESPACE and tracing on Linux

The tracegen tool was not taking into account that Qt could be build
with a custom namespace. As a result, the combination of namespace
build and tracing enabled was not working, because tracegen generated
classes without the namespace.

This patch fixes it.
We cannot add QT_BEGIN_NAMESPACE/QT_END_NAMESPACE because of the
tricky logic that recursively includes the generated header file
multiple times, also including the code like

static const struct lttng_event_desc *_TP_COMBINE_TOKENS(__event_desc___, TRACEPOINT_PROVIDER)[] = {
(hash)include TRACEPOINT_INCLUDE
    NULL, /* Dummy, C99 forbids 0-len array. */
};

where TRACEPOINT_INCLUDE is the path to the generated header.

This patch is using QT_USE_NAMESPACE, wrapped into some #ifdefs.
This should be safe, considering that the generated trace headers
are only used as private API.

The windows tracing support seems to be broken even in a
non-namespace build, so it's not handled in this patch.

Task-number: QTBUG-97246
Pick-to: 6.2
Change-Id: I12db76e199a3aa3abde641fbf99a6e1a3d7de203
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Ievgenii Meshcheriakov <ievgenii.meshcheriakov@qt.io>

0 files changed, 0 insertions, 0 deletions