From bae8ce371abf2cbcbaedf51cfef4179e4caa4b5c Mon Sep 17 00:00:00 2001
From: Marc Mutz <marc.mutz@qt.io>
Date: Tue, 9 Jan 2024 10:54:27 +0100
Subject: [PATCH] Fix some -Wunused-* warnings on MinGW

Found while inspecting a recent MingWG log file from the CI.

Amends a2551c45d496c23045eb8451e080e75b2f8b42c1.
Amends f992402f15fd117bb5ccf9a484bf31fd4f4967e2.

Pick-to: 6.6
Change-Id: Icf56ddc19ac7b40718ec3f429d14cbcb1a2e164f
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
(cherry picked from commit 9aaf1a031befc39244290c63f3905896934f6082)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
---
 tests/auto/corelib/io/qprocess/testProcessCrash/main.cpp | 1 +
 tests/auto/testlib/tostring/tst_tostring.cpp             | 6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/tests/auto/corelib/io/qprocess/testProcessCrash/main.cpp b/tests/auto/corelib/io/qprocess/testProcessCrash/main.cpp
index 474508c453f..fb3112ffaa1 100644
--- a/tests/auto/corelib/io/qprocess/testProcessCrash/main.cpp
+++ b/tests/auto/corelib/io/qprocess/testProcessCrash/main.cpp
@@ -7,6 +7,7 @@ using namespace tst_QProcessCrash;
 
 int main()
 {
+    [[maybe_unused]] // NoCoreDumps may be an empty struct, not a RAII class
     NoCoreDumps disableCoreDumps;
     crash();
     return 0;
diff --git a/tests/auto/testlib/tostring/tst_tostring.cpp b/tests/auto/testlib/tostring/tst_tostring.cpp
index 29582c446a8..3f653ad7321 100644
--- a/tests/auto/testlib/tostring/tst_tostring.cpp
+++ b/tests/auto/testlib/tostring/tst_tostring.cpp
@@ -129,7 +129,7 @@ void tst_toString::chrono_duration_data()
     using decades = duration<int, std::ratio_multiply<years::period, std::deca>>; // decayears
     using centuries = duration<int16_t, std::ratio_multiply<years::period, std::hecto>>; // hectoyears
     using millennia = duration<int16_t, std::ratio_multiply<years::period, std::kilo>>; // kiloyears
-    using gigayears = duration<int8_t, std::ratio_multiply<years::period, std::giga>>;
+    using gigayears [[maybe_unused]] = duration<int8_t, std::ratio_multiply<years::period, std::giga>>;
     using fortnights = duration<int, std::ratio_multiply<days::period, std::ratio<14>>>;
     using microfortnights = duration<int64_t, std::ratio_multiply<fortnights::period, std::micro>>;
     using meter_per_light = duration<int64_t, std::ratio<1, 299'792'458>>;
@@ -186,12 +186,12 @@ void tst_toString::chrono_duration_data()
 
     // real floting point
     // current (2023) best estimate is 13.813 ± 0.038 billion years (Plank Collaboration)
-    using universe = duration<double, std::ratio_multiply<std::ratio<13'813'000'000>, years::period>>;
+    using universe [[maybe_unused]] = duration<double, std::ratio_multiply<std::ratio<13'813'000'000>, years::period>>;
     using fpksec = duration<double, std::kilo>;
     using fpsec = duration<double>;
     using fpmsec = duration<double, std::milli>;
     using fpnsec = duration<double, std::nano>;
-    using fpGyr = duration<double, std::ratio_multiply<years::period, std::giga>>;
+    using fpGyr [[maybe_unused]] = duration<double, std::ratio_multiply<years::period, std::giga>>;
 
     ADD_ROW("1.0s", fpsec{1}, "1s");
     ADD_ROW("1.5s", fpsec{1.5}, "1.5s");