cmake: Use trace for missing link flags (fixes #6386)

This is neccessary for static libraries, since the
CMake file API does not add link flags here.

6 files changed, 60 insertions, 0 deletions

diff --git a/test cases/cmake/16 threads/main.cpp b/test cases/cmake/16 threads/main.cpp
new file mode 100644
index 000000000..67ee110a3
--- /dev/null
+++ b/test cases/cmake/16 threads/main.cpp
@@ -0,0 +1,9 @@
+#include "cmMod.hpp"
+
+#include <cstdlib>
+
+int main() {
+  CmMod cc;
+  cc.asyncIncrement();
+  return cc.getNum() == 1 ? EXIT_SUCCESS : EXIT_FAILURE;
+}
diff --git a/test cases/cmake/16 threads/meson.build b/test cases/cmake/16 threads/meson.build
new file mode 100644
index 000000000..d7ade1c4a
--- /dev/null
+++ b/test cases/cmake/16 threads/meson.build
@@ -0,0 +1,8 @@
+project('cmMod', ['c', 'cpp'])
+
+cm       = import('cmake')
+cmMod    = cm.subproject('cmMod')
+cmModDep = cmMod.dependency('cmModLib')
+
+exe1 = executable('exe1', ['main.cpp'], dependencies: [cmModDep])
+test('exe1_OK', exe1)
diff --git a/test cases/cmake/16 threads/subprojects/cmMod/CMakeLists.txt b/test cases/cmake/16 threads/subprojects/cmMod/CMakeLists.txt
new file mode 100644
index 000000000..37d32c123
--- /dev/null
+++ b/test cases/cmake/16 threads/subprojects/cmMod/CMakeLists.txt
@@ -0,0 +1,9 @@
+cmake_minimum_required(VERSION 3.5)
+
+project(cmMod CXX)
+set (CMAKE_CXX_STANDARD 14)
+
+find_package(Threads)
+
+add_library(cmModLib STATIC cmMod.cpp)
+target_link_libraries(cmModLib PRIVATE Threads::Threads)
diff --git a/test cases/cmake/16 threads/subprojects/cmMod/cmMod.cpp b/test cases/cmake/16 threads/subprojects/cmMod/cmMod.cpp
new file mode 100644
index 000000000..f971eeba0
--- /dev/null
+++ b/test cases/cmake/16 threads/subprojects/cmMod/cmMod.cpp
@@ -0,0 +1,15 @@
+#include "cmMod.hpp"
+
+#include <chrono>
+#include <thread>
+
+using namespace std::chrono_literals;
+
+void CmMod::asyncIncrement() {
+  std::thread t1([this]() {
+    std::this_thread::sleep_for(100ms);
+    num += 1;
+  });
+
+  t1.join();
+}
diff --git a/test cases/cmake/16 threads/subprojects/cmMod/cmMod.hpp b/test cases/cmake/16 threads/subprojects/cmMod/cmMod.hpp
new file mode 100644
index 000000000..1c85a8b1a
--- /dev/null
+++ b/test cases/cmake/16 threads/subprojects/cmMod/cmMod.hpp
@@ -0,0 +1,10 @@
+#pragma once
+
+class CmMod {
+private:
+  int num = 0;
+
+public:
+  inline int getNum() const { return num; }
+  void asyncIncrement();
+};
diff --git a/test cases/cmake/16 threads/subprojects/cmMod/main.cpp b/test cases/cmake/16 threads/subprojects/cmMod/main.cpp
new file mode 100644
index 000000000..67ee110a3
--- /dev/null
+++ b/test cases/cmake/16 threads/subprojects/cmMod/main.cpp
@@ -0,0 +1,9 @@
+#include "cmMod.hpp"
+
+#include <cstdlib>
+
+int main() {
+  CmMod cc;
+  cc.asyncIncrement();
+  return cc.getNum() == 1 ? EXIT_SUCCESS : EXIT_FAILURE;
+}