From c10c66e552e3ab19758709e84bac187cda27962c Mon Sep 17 00:00:00 2001
From: Hatem ElKharashy <hatem.elkharashy@qt.io>
Date: Tue, 11 Apr 2023 12:24:26 +0300
Subject: [PATCH] Support float_type arrays when using lttng
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lttng ctf_array does not support float types which
causes compilation error when a float type is passed
to the function. A solution is to pass the array
elements one by one to TP_FIELDS.

Fixes: QTBUG-112761
Pick-to: 6.5
Change-Id: I30e7049d9eda1141298145897df372213145c1b4
Reviewed-by: Antti Määttä <antti.maatta@qt.io>
Reviewed-by: Janne Koskinen <janne.p.koskinen@qt.io>
---
 src/tools/tracegen/lttng.cpp | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/src/tools/tracegen/lttng.cpp b/src/tools/tracegen/lttng.cpp
index b812682217a..ff94bba3f33 100644
--- a/src/tools/tracegen/lttng.cpp
+++ b/src/tools/tracegen/lttng.cpp
@@ -20,8 +20,19 @@ static void writeCtfMacro(QTextStream &stream, const Provider &provider, const T
     const int arrayLen = field.arrayLen;
 
     if (arrayLen > 0) {
-        stream << "ctf_array(" <<paramType << ", "
-               << name << ", " << name << ", " << arrayLen << ")";
+        if (paramType == QStringLiteral("double") || paramType == QStringLiteral("float")) {
+            const char *newline = nullptr;
+            for (int i = 0; i < arrayLen; i++) {
+                stream << newline;
+                stream << "ctf_float(" <<paramType << ", " << name << "_" << QString::number(i) << ", "
+                       << name << "[" << QString::number(i) << "]" << ")";
+                newline = "\n        ";
+            }
+
+        } else {
+            stream << "ctf_array(" <<paramType << ", "
+                   << name << ", " << name << ", " << arrayLen << ")";
+        }
         return;
     }