Fix #11179 - re-enable warnings gcc clang and turn on `-Werror` #11180

jmarrec · 2025-08-28T00:09:38Z

Pull request overview

Fixes Warnings are disabled on gcc/clang (-w flag is leaking from third_party) #11179

Description of the purpose of this PR

Fixup third_party code to avoid leaking the -w flag
Turn on Werror
Fixup all errors until it compiles (at least on GCC 13.2 in Release)

I built with -fdiagnostics-format=json before turning on Werror, and parsed the output.

ninja &> diagnostics

I found 1496 warnings, 296 unique.

In the unique ones, classification counts were

Counter({'-Wunused-variable': 192,
         '-Wstrict-aliasing': 35,
         '-Wunused-parameter': 21,
         '-Wsign-compare': 15,
         '-Wswitch': 13,
         '-Wunused-value': 9,
         '-Wuninitialized': 5,
         '-Wreorder': 3,
         '-Wparentheses': 2,
         '-Wsequence-point': 1})

Pull Request Author

Reviewer

jmarrec · 2025-08-28T00:11:36Z

third_party/CMakeLists.txt

 add_subdirectory(FMI)
 set_target_properties(epfmiimport PROPERTIES FOLDER ThirdParty/FMI)
-target_link_libraries(epfmiimport turn_off_warnings)
+target_link_libraries(epfmiimport PRIVATE turn_off_warnings)


that was the root cause of the -w flag leak

jmarrec · 2025-08-28T00:12:23Z

third_party/FMI/CMakeLists.txt

+endif()

-TARGET_LINK_LIBRARIES( epfmiimport epexpat miniziplib )
+target_link_libraries(epfmiimport PRIVATE epexpat miniziplib)


Couldn't mix the old signature with the new that has PUBLIC/PRIVATE/INTERFACE, and probably why it was the only target linking to turn_off_warnings that wasn't linking with PRIVATE

jmarrec · 2025-08-28T00:13:15Z

src/EnergyPlus/OutputProcessor.hh

+// A helper to be able to cast an enum to an int& for use in the above function
+template <typename EnumType, typename = std::enable_if_t<std::is_enum_v<EnumType>>>
+void SetupOutputVariable(EnergyPlusData &state,
+                         std::string_view const VariableName,                                 // String Name of variable
+                         Constant::Units VariableUnit,                                        // Actual units corresponding to the actual variable
+                         EnumType &ActualVariable,                                                 // Actual Variable, used to set up pointer
+                         OutputProcessor::TimeStepType TimeStepType,                          // Zone, HeatBalance=1, HVAC, System, Plant=2
+                         OutputProcessor::StoreType VariableType,                             // State, Average=1, NonState, Sum=2
+                         std::string const &KeyedValue,                                       // Associated Key for this variable
+                         int const indexGroupKey = -999,                                      // Group identifier for SQL output
+                         OutputProcessor::ReportFreq freq = OutputProcessor::ReportFreq::Hour // Internal use -- causes reporting at this freqency
+        ) {
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wstrict-aliasing"
+    SetupOutputVariable(state,
+                        VariableName,
+                        VariableUnit,
+                        (int &)ActualVariable,
+                        TimeStepType,
+                        VariableType,
+                        KeyedValue,
+                        indexGroupKey,
+                        freq);
+#pragma GCC diagnostic pop
+};


This is to silence the Wstrict-aliasing warnings

/home/julien/Software/Others/EnergyPlus/src/EnergyPlus/EMSManager.cc: In function ‘void EnergyPlus::EMSManager::SetupPrimaryAirSystemAvailMgrAsActuators(EnergyPlus::EnergyPlusData&)’: /home/julien/Software/Others/EnergyPlus/src/EnergyPlus/EMSManager.cc:1639:84: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing] 1639 | (int &)state.dataAirLoop->PriAirSysAvailMgr(Loop).availStatus); | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~

jmarrec · 2025-08-28T00:14:15Z

src/EnergyPlus/EMSManager.cc

+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wstrict-aliasing"
                SetupEMSActuator(state,
                                 "AirLoopHVAC",
                                 state.dataAirSystemsData->PrimaryAirSystems(Loop).Name,
                                 "Availability Status",
                                 "[ ]",
                                 state.dataEMSMgr->lDummy2,
                                 (int &)state.dataAirLoop->PriAirSysAvailMgr(Loop).availStatus);
+#pragma GCC diagnostic pop


This is the only call to SetupEMSActuator that was violating strict-aliasing, so just pragma around it, no need for a template

jmarrec · 2025-08-28T00:15:18Z

src/EnergyPlus/HeatBalanceSurfaceManager.cc

                Real64 HGround = 0.0;   // "Convection" coefficient from ground to surface
                Real64 HAir = 0.0;      // "Convection" coefficient from air to surface (radiation)
-                Real64 HSurrr = 0.0;    // "Linearized radiation" coefficient from surrounding surfaces to surface
+                // Real64 HSurrr = 0.0;    // "Linearized radiation" coefficient from surrounding surfaces to surface


The rest is mostly fixing some unused variables or parameters and a couple of weird things

jmarrec · 2025-08-28T00:15:44Z

src/EnergyPlus/DataSizing.cc

                if ((spaceNum == 0) || (spaceNum == dsoaSpaceNum)) {
                    Real64 spaceArea = state.dataHeatBal->space(this->dsoaSpaceIndexes(dsoaCount)).FloorArea;
-                    sumArea + -spaceArea;
+                    sumArea += spaceArea;


It did catch a bunch of scary looking problems!

Yeah, how did it not cause diffs!?

jmarrec · 2025-08-28T00:16:06Z

src/EnergyPlus/GroundHeatExchangers.cc


    // Add the rest of the long time-step g-functions to the combined curve
-    for (int index_longTS = 0; index_longTS < this->myRespFactors->GFNC.size(); ++index_longTS) {
+    for (size_t index_longTS = 0; index_longTS < this->myRespFactors->GFNC.size(); ++index_longTS) {


Wsign-compare

jmarrec · 2025-08-28T00:16:13Z

src/EnergyPlus/GroundHeatExchangers.cc

    }

-    for (int i = 1; i < g.size() - 1; ++i) {
+    for (int i = 1; i < static_cast<int>(g.size() - 1); ++i) {


another Wsign-compare

jmarrec · 2025-08-28T13:18:47Z

src/EnergyPlus/EconomicTariff.cc

        Op op = static_cast<Op>(getEnumValue(opNamesUC, word));
        if (op == Op::Invalid) {
-            static_cast<Op>(getEnumValue(opNames2UC, word));
+            op = static_cast<Op>(getEnumValue(opNames2UC, word));
        }


This is one of the cases where I could see a potential diff in the regressions. It was clearly wrong before

Myoldmopar · 2025-08-28T15:46:00Z

WOW! And just like that, EnergyPlus is at -Werror and you've addressed hundreds of warnings that were being silenced. AND NO DIFFS!! This is fantastic, @jmarrec. I'll take a look at the changes, but I'm confident this will drop in right away.

Myoldmopar

This is fantastic! I approve of the changes, although I'd like to add in a Windows build to the PR before I merge it into develop. I guess alternatively I could kick off a release package build which would do all three platforms. I will hold for now, but I'm happy to do whatever is needed to wrap this up, it is great.

Myoldmopar · 2025-08-28T15:47:09Z

cmake/CompilerFlags.cmake


  # COMPILER FLAGS
  target_compile_options(project_options INTERFACE -pipe) # Faster compiler processing
+  target_compile_options(project_options INTERFACE -Werror) # Compiler Driven Development


Myoldmopar · 2025-08-28T15:47:35Z

src/EnergyPlus/Coils/CoilCoolingDX.cc

                        "Cooling Coil Dehumidification Mode",
                        Constant::Units::None,
-                        (int &)this->dehumidificationMode,
+                        this->dehumidificationMode,


Yes, very good!

Myoldmopar · 2025-08-28T15:48:30Z

src/EnergyPlus/Plant/EquipAndOperations.cc

                   (this->Report.BuildingPolledHeatingLoad > HVAC::SmallLoad)) {
            this->PlantOps.AirSourcePlantSimultaneousHeatingAndCooling = true;
-            if (this->Report.BuildingPolledHeatingLoad > abs(this->Report.BuildingPolledCoolingLoad)) {
+            if (this->Report.BuildingPolledHeatingLoad > std::abs(this->Report.BuildingPolledCoolingLoad)) {


A great find, and I'm glad it didn't cause any diffs.

Myoldmopar · 2025-08-28T15:48:55Z

src/EnergyPlus/DataSizing.cc

                if ((spaceNum == 0) || (spaceNum == dsoaSpaceNum)) {
                    Real64 spaceArea = state.dataHeatBal->space(this->dsoaSpaceIndexes(dsoaCount)).FloorArea;
-                    sumArea + -spaceArea;
+                    sumArea += spaceArea;


Yeah, how did it not cause diffs!?

jmarrec · 2025-09-01T09:24:20Z

This is fantastic! I approve of the changes, although I'd like to add in a Windows build to the PR before I merge it into develop. I guess alternatively I could kick off a release package build which would do all three platforms. I will hold for now, but I'm happy to do whatever is needed to wrap this up, it is great.

I've launched a test release at https://github.com/NREL/EnergyPlus/releases/tag/v25.2.0-TestWerror

```diff build third_party/ssc/splinter/CMakeFiles/splinter.dir/mykroneckerproduct.cpp.o: CXX_COMPILER__splinter_unscanned_Release /home/julien/Software/Others/EnergyPlus/third_party/ssc/splinter/mykroneckerproduct.cpp || cmake_object_order_depends_target_splinter CONFIG = Release + DEFINES = -DNDEBUG -D__64BIT__ -D__UNIX__ DEP_FILE = third_party/ssc/splinter/CMakeFiles/splinter.dir/mykroneckerproduct.cpp.o.d - FLAGS = -O3 -DNDEBUG -std=gnu++11 -fPIC -fvisibility=hidden -D__64BIT__ -D__UNIX__ -O3 -DNDEBUG -w -Wno-error -w + FLAGS = -O3 -DNDEBUG -std=gnu++11 -fPIC -fvisibility=hidden -w -Wno-error INCLUDES = -I/home/julien/Software/Others/EnergyPlus/third_party/ssc/splinter/. -I/home/julien/Software/Others/EnergyPlus/third_party/ssc/splinter/../ssc LAUNCHER = /usr/bin/ccache OBJECT_DIR = third_party/ssc/splinter/CMakeFiles/splinter.dir @@ -934,8 +943,9 @@ ``` No more duplicates.

…TE, so it was treated publicly ```diff --- build.ninja.bak2 2025-08-27 20:52:22.434771013 +0200 +++ build.ninja 2025-08-27 20:52:25.455853497 +0200 @@ -9302,7 +9302,7 @@ CONFIG = Release DEFINES = -DEP_cache_GlycolSpecificHeat -DEP_psych_errors -DHAVE_FEENABLEEXCEPT -DJSON_USE_IMPLICIT_CONVERSIONS=1 -DLINK_WITH_PYTHON -DOBJEXXFCL_ALIGN=64 -DXML_STATIC DEP_FILE = src/EnergyPlus/CMakeFiles/energypluslib.dir/cmake_pch.hxx.gch.d - FLAGS = -O3 -DNDEBUG -fPIC -fvisibility=hidden -pipe -fno-stack-protector -fdiagnostics-color=always -Wno-deprecated-declarations -w -fPIC -Wpedantic -Wall -Wextra -Wno-unknown-pragmas -Wno-deprecated-copy -Wno-attributes -Wno-delete-non-virtual-dtor -Wno-missing-braces -Wno-unused-but-set-parameter -Wno-unused-but-set-variable -Wno-maybe-uninitialized -Wno-aggressive-loop-optimizations -Wno-dangling-reference -Wno-array-bounds -Wno-stringop-overflow -Winvalid-pch -x c++-header -include /home/julien/Software/Others/EnergyPlus-build-release/src/EnergyPlus/CMakeFiles/energypluslib.dir/cmake_pch.hxx + FLAGS = -O3 -DNDEBUG -fPIC -fvisibility=hidden -pipe -fno-stack-protector -fdiagnostics-color=always -Wno-deprecated-declarations -fPIC -Wpedantic -Wall -Wextra -Wno-unknown-pragmas -Wno-deprecated-copy -Wno-attributes -Wno-delete-non-virtual-dtor -Wno-missing-braces -Wno-unused-but-set-parameter -Wno-unused-but-set-variable -Wno-maybe-uninitialized -Wno-aggressive-loop-optimizations -Wno-dangling-reference -Wno-array-bounds -Wno-stringop-overflow -Winvalid-pch -x c++-header -include /home/julien/Software/Others/EnergyPlus-build-release/src/EnergyPlus/CMakeFiles/energypluslib.dir/cmake_pch.hxx INCLUDES = -I/home/julien/.pyenv/versions/3.12.2/include/python3.12 -I/home/julien/Software/Others/EnergyPlus/idd -I/home/julien/Software/Others/EnergyPlus/third_party/fmt-8.0.1/include -I/home/julien/Software/Others/EnergyPlus/src -I/home/julien/Software/Others/EnergyPlus/third_party -I/home/julien/Software/Others/EnergyPlus/third_party/btwxt/include -I/home/julien/Software/Others/EnergyPlus/third_party/re2 -I/home/julien/Software/Others/EnergyPlus/third_party/doj -I/home/julien/Software/Others/EnergyPlus/third_party/nlohmann -I/home/julien/Software/Others/EnergyPlus/third_party/fast_float -I/home/julien/Software/Others/EnergyPlus/third_party/valijson -I/home/julien/Software/Others/EnergyPlus/third_party/ObjexxFCL/src -I/home/julien/Software/Others/EnergyPlus/third_party/CLI -I/home/julien/Software/Others/EnergyPlus/third_party/eigen -I/home/julien/Software/Others/EnergyPlus/third_party/Windows-CalcEngine/src/Chromogenics/include -I/home/julien/Software/Others/EnergyPlus/third_party/Windows-CalcEngine/src/Common/include -I/home/julien/Software/Others/EnergyPlus/third_party/Windows-CalcEngine/src/Gases/include -I/home/julien/Software/Others/EnergyPlus/third_party/Windows-CalcEngine/src/MultiLayerOptics/include -I/home/julien/Software/Others/EnergyPlus/third_party/Windows-CalcEngine/src/SingleLayerOptics/include -I/home/julien/Software/Others/EnergyPlus/third_party/Windows-CalcEngine/src/SpectralAveraging/include -I/home/julien/Software/Others/EnergyPlus/third_party/Windows-CalcEngine/src/Tarcog/include -I/home/julien/Software/Others/EnergyPlus/third_party/Windows-CalcEngine/src/Viewer/include -I/home/julien/Software/Others/EnergyPlus/third_party/ssc -I/home/julien/Software/Others/EnergyPlus/third_party/penumbra/include -I/home/julien/Software/Others/EnergyPlus/third_party/kiva/src -I/home/julien/Software/Others/EnergyPlus-build-release/third_party/kiva/src/libkiva -I/home/julien/Software/Others/EnergyPlus/third_party/cpgfunctionEP -I/home/julien/Software/Others/EnergyPlus/third_party/cpgfunctionEP/include -I/home/julien/Software/Others/EnergyPlus/third_party/kiva/src/libkiva -I/home/julien/Software/Others/EnergyPlus/third_party/kiva/vendor/boost-1.77.0 -I/home/julien/Software/Others/EnergyPlus/third_party/kiva/vendor/eigen -I/home/julien/Software/Others/EnergyPlus/third_party/btwxt/vendor/courierr/include -I/home/julien/Software/Others/EnergyPlus/src/EnergyPlus/AirflowNetwork/include -I/home/julien/Software/Others/EnergyPlus/third_party/ssc/jsoncpp/src/lib_json/../../include -I/home/julien/Software/Others/EnergyPlus-build-release/third_party/ssc/jsoncpp/include/json -I/home/julien/Software/Others/EnergyPlus/third_party/libtk205/include/libtk205 -I/home/julien/Software/Others/EnergyPlus/third_party/libtk205/vendor/btwxt/include -isystem /home/julien/Software/Others/EnergyPlus/third_party/SQLite -isystem /home/julien/Software/Others/EnergyPlus/third_party/Expat -isystem /home/julien/Software/Others/EnergyPlus/third_party/Expat/lib -isystem /home/julien/Software/Others/EnergyPlus/third_party/kiva/vendor/boost-1.61.0 -isystem /home/julien/Software/Others/EnergyPlus/nlohmann LAUNCHER = /usr/bin/ccache OBJECT_DIR = src/EnergyPlus/CMakeFiles/energypluslib.dir ```

…se for src/EnergyPlus

…ICT_ALIASING changes

…ilences the Wstrict-aliasing

…ict-aliasing

…t is taken out in Release)

``` /home/julien/Software/Others/EnergyPlus2/src/EnergyPlus/EMSManager.cc:2022:32: error: moving a temporary object prevents copy elision [-Werror,-Wpessimizing-move] 2022 | auto tup = std::make_tuple(std::move(Util::makeUPPER(objType)), std::move(Util::makeUPPER(objName)), std::move(Util::makeUPPER(controlTypeName))); ```

/home/julien/Software/Others/EnergyPlus2/third_party/FMUParser/fmumini.c:449:5: error: a function definition without a prototype is deprecated in all versions of C and is not supported in C23 [-Werror,-Wdeprecated-non-prototype] 449 | int do_extract_onefile(uf, filename, opt_extract_without_path, opt_overwrite, password) unzFile uf;

energypluslib is error free on clang 18

…) (be safe)

…an't remove, mark maybe_unused (locally I built clang in Debug)

This reverts commit 51f6e7c.

jmarrec · 2025-09-01T13:26:48Z

I broken windows by touching the SSC stuff. I know how to fix it, but I think I'm just going to revert the changes instead. I assume changing the SSC cmake here will make updating SSC with upstream more complicated.

The issue is that I changed, ssc/CMakeLists.txt:

function(set_additional_compile_options target options) 
-    get_target_property(MAIN_CFLAGS ${target} COMPILE_FLAGS)
-    if (MAIN_CFLAGS MATCHES "NOTFOUND")
-        set(MAIN_CFLAGS "")
-    endif()
-    set(MAIN_CFLAGS "${MAIN_CFLAGS} ${options}")
-    set_target_properties(${target} PROPERTIES COMPILE_FLAGS ${MAIN_CFLAGS})
+    target_compile_options(${target} PRIVATE ${options})
endfunction()

Then in ssc/splinter/CMakeLists.txt, which I DID NOT modify:

if(MSVC)
   set_additional_compile_options(splinter "/W2 /wd4267 /wd4244")
endif(MSVC)

As a result the STRING "/W2 /wd4267 /wd4244" is passed directly and verbatim to cl.exe.

I would modify that to target_compile_options(splinter PRIVATE /W2 /wd4267 /wd4244) and it'd work, but I have to do that in 5 different CMakeLists.txt

jmarrec · 2025-09-01T13:30:44Z

Launched another release at https://github.com/NREL/EnergyPlus/releases/tag/v25.2.0-TestWerror (after deleting previous one)

jmarrec · 2025-09-01T14:35:26Z

@Myoldmopar all green

Myoldmopar · 2025-09-01T15:53:23Z

Yes let's go! Thanks @jmarrec, awesome stuff here. Merging this now.

jmarrec self-assigned this Aug 28, 2025

jmarrec added Defect Includes code to repair a defect in EnergyPlus Developer Issue Related to cmake, packaging, installers, or developer tooling (CI, etc) labels Aug 28, 2025

jmarrec changed the title ~~FIx #11179 - reeneable warnings gcc clang and turn on -Werror~~ Fix #11179 - re-enable warnings gcc clang and turn on -Werror Aug 28, 2025

jmarrec commented Aug 28, 2025

View reviewed changes

jmarrec requested a review from Myoldmopar August 28, 2025 00:25

jmarrec commented Aug 28, 2025

View reviewed changes

Myoldmopar approved these changes Aug 28, 2025

View reviewed changes

jmarrec added 20 commits September 1, 2025 15:23

Modernize FMI CMakeLists.txt while at it

23c8424

Enable -Werror -Wno-error=strict-aliasing and fix everything in Relea…

3bf0027

…se for src/EnergyPlus

Werror enabled on tst!

c3a059a

Fixup a test

126f0e3

Re-enable error on strict-aliasing and revert the DISABLE_WARNING_STR…

1ebc35d

…ICT_ALIASING changes

Add a templated SetupOutputVariable that accepts a std::is_enum and s…

f5b3023

…ilences the Wstrict-aliasing

Shush the call to SetupEMSActuator for AvailStatus that triggers Wstr…

d89f882

…ict-aliasing

Lint/Format

2cc14a9

Fix one thing my GCC didn't warn on Release + 2 found in debug (asser…

565e843

…t is taken out in Release)

Keep on solving Werror on clang 18 (lots of -Wunused-const-variable)

3e8f243

pessimizing move + a potential issue in Economic Tariff (review!)

428f200

energypluslib is error free on clang 18

Werror ok on tests with clang18 (Debug)

9995732

pragma diangostics ONLY if #if defined(__GNUC__) || defined(__clang__…

8a0ae4a

…) (be safe)

CI catches stuff that works locally..

6a81e5a

CI catches the unused because it's Release, and the assert is gone. C…

70ec79d

…an't remove, mark maybe_unused (locally I built clang in Debug)

Another CI error I don't get locally

edfe37e

jmarrec added 2 commits September 1, 2025 15:23

Don't hardcode nrpoc in workflow

d780906

Revert "Modernize ssc cmake - still showing -w"

b1b8ac1

This reverts commit 51f6e7c.

jmarrec force-pushed the 11179_Reeneable_Warnings_gcc_clang branch from ab0b5c5 to b1b8ac1 Compare September 1, 2025 13:28

Myoldmopar merged commit 89f2dd2 into develop Sep 1, 2025
24 checks passed

Myoldmopar deleted the 11179_Reeneable_Warnings_gcc_clang branch September 1, 2025 15:53

jmarrec mentioned this pull request Sep 5, 2025

Windows fixup for current develop #11191

Merged

20 tasks

Fix #11179 - re-enable warnings gcc clang and turn on -Werror #11180

Fix #11179 - re-enable warnings gcc clang and turn on -Werror #11180

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Fix #11179 - re-enable warnings gcc clang and turn on `-Werror` #11180

Fix #11179 - re-enable warnings gcc clang and turn on `-Werror` #11180

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