Support for LTTNG and ETW tracing

This commit introduces minimal support for instrumentation within Qt.
Currently, only LTTNG/Linux and ETW/Windows are supported.

Change-Id: I59b48cf83acf5532a998bb493e6379e9177e14c8
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 54 insertions, 0 deletions

diff --git a/mkspecs/features/qt_tracepoints.prf b/mkspecs/features/qt_tracepoints.prf
new file mode 100644
index 0000000000..d1b45a47cb
--- /dev/null
+++ b/mkspecs/features/qt_tracepoints.prf
@@ -0,0 +1,54 @@
+#  W A R N I N G
+#  -------------
+#
+# This file is not part of the Qt API.  It exists purely as an
+# implementation detail.  It may change from version to version
+# without notice, or even be removed.
+#
+# We mean it.
+#
+
+qtPrepareTool(QMAKE_TRACEGEN, tracegen)
+
+isEmpty(TRACEGEN_DIR): TRACEGEN_DIR = .
+
+PROVIDER_NAME = qt$$lower($$MODULE)
+INCLUDEPATH += $$absolute_path($$TRACEGEN_DIR, $$OUT_PWD)
+HEADER_PATH = $$OUT_PWD/$$TRACEGEN_DIR/$${PROVIDER_NAME}_tracepoints_p$${first(QMAKE_EXT_H)}
+
+!force_bootstrap:if(qtConfig(lttng)|qtConfig(etw)) {
+    SOURCE_PATH = $$OUT_PWD/$$TRACEGEN_DIR/$${PROVIDER_NAME}_tracepoints$${first(QMAKE_EXT_CPP)}
+
+    isEmpty(BUILDS)|build_pass {
+        impl_file_contents = \
+            "$${LITERAL_HASH}define TRACEPOINT_CREATE_PROBES" \
+            "$${LITERAL_HASH}define TRACEPOINT_DEFINE" \
+            "$${LITERAL_HASH}include \"$${HEADER_PATH}\""
+
+        write_file($$SOURCE_PATH, impl_file_contents)|error()
+    }
+
+    GENERATED_SOURCES += $$SOURCE_PATH
+
+    tracegen.input = TRACEPOINT_PROVIDER
+    tracegen.output = $$HEADER_PATH
+    tracegen.variable_out = HEADERS
+    tracegen.depends += $$QMAKE_TRACEGEN_EXE
+    tracegen.CONFIG = target_predeps
+
+    qtConfig(lttng) {
+        tracegen.commands = $$QMAKE_TRACEGEN lttng ${QMAKE_FILE_IN} ${QMAKE_FILE_OUT}
+        QMAKE_USE_PRIVATE += lttng-ust
+    } else {
+        tracegen.commands = $$QMAKE_TRACEGEN etw ${QMAKE_FILE_IN} ${QMAKE_FILE_OUT}
+    }
+
+    QMAKE_EXTRA_COMPILERS += tracegen
+
+    DEFINES += Q_TRACEPOINT
+} else {
+    isEmpty(BUILDS)|build_pass {
+        header_file_contents = "$${LITERAL_HASH}include <private/qtrace_p.h>"
+        write_file($$HEADER_PATH, header_file_contents)|error()
+    }
+}