fix

.github/workflows/main.yml

@@ -15,16 +15,13 @@ jobs:
     - uses: actions/checkout@v4
     - name: install debian-packaged dependencies
       run: sudo apt install -y libgtest-dev libbenchmark-dev libfmt-dev tidy git python3 python3-dateutil python3-pip
-
-    # NOTE: prometheus-cpp & its dependencies wants at least Conan 1.51.0
     - name: install pypi-packaged dependencies
-      run: sudo pip3 install pytest 'black==22.8.0' 'conan==1.60.2'
+      run: sudo pip3 install pytest 'black==22.8.0' 'conan==2.9.1'
 
     # NOTE: since we later run "make" using the normal "builder" user, we must use Conan using that same user (so avoid the "sudo"!!)
     - name: install Conan-packaged dependencies
       run: |
          conan profile new default --detect
-         conan profile update settings.compiler.libcxx=libstdc++11 default
          conan install conanfile.txt --build=missing
 
     # build & test

collector/src/Makefile

@@ -90,7 +90,7 @@ benchmarks:
 
 
 $(OUT): $(OBJS) $(ROOT_DIR)/Constants.mk
-	$(CXX) $(LDFLAGS) -o $(OUT) $(OBJS) $(LIBS)
+	$(CXX) $(LDFLAGS) -o $(OUT) $(OBJS) -Wl,--start-group $(LIBS) -Wl,--end-group
 
 clean:
 	rm -f $(OUT) $(OBJS) *.err *.json *.log

collector/src/benchmarks/Makefile

@@ -75,7 +75,7 @@ debug:
 	gdb $(OUT)
 
 $(OUT): $(OBJS) $(ROOT_DIR)/Constants.mk
-	$(CXX) $(LDFLAGS) -o $(OUT) $(OBJS) $(LIBS)
+	$(CXX) $(LDFLAGS) -o $(OUT) $(OBJS) -Wl,--start-group $(LIBS) -Wl,--end-group
 
 clean:
 	rm -f $(OUT) $(OBJS) 

collector/src/tests/Makefile

@@ -88,7 +88,7 @@ accept_new_results:
 	done
 
 $(OUT): $(OBJS) $(ROOT_DIR)/Constants.mk
-	$(CXX) $(LDFLAGS) -o $(OUT) $(OBJS) $(LIBS)
+	$(CXX) $(LDFLAGS) -o $(OUT) $(OBJS) -Wl,--start-group $(LIBS) -Wl,--end-group
 
 clean:
 	rm -f $(OUT) $(OBJS) *.err *.json *.log

conanfile.txt

@@ -4,7 +4,7 @@
 #
 
 [requires]
-  prometheus-cpp/1.2.4@
+  prometheus-cpp/1.3.0@
 
 [options]
   # by using shared=False we create a cmonitor_collector binary that is self-contained