diff --git a/cmake/CompilerFlags.cmake b/cmake/CompilerFlags.cmake
index cb7e26e0db3..9b1d5c9ef05 100644
--- a/cmake/CompilerFlags.cmake
+++ b/cmake/CompilerFlags.cmake
@@ -120,6 +120,10 @@ elseif(CMAKE_COMPILER_IS_GNUCXX OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang" O
     # depending on the level of overflow check selected, the stringop-overflow can also emit false positives
     # https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wstringop-overflow
     target_compile_options(project_warnings INTERFACE -Wno-stringop-overflow)
+    if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 15.0)
+      # GCC 15 emits false positives through libstdc++ when compiling bundled fmt 8.0.1 with -Werror
+      target_compile_options(project_warnings INTERFACE -Wno-restrict)
+    endif()
     # for RelWithDebInfo builds, lets turn OFF NDEBUG, which will re-enable assert statements
     target_compile_options(project_options INTERFACE $<$<CONFIG:RelWithDebInfo>:-UNDEBUG>)
   elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang" OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "AppleClang")
diff --git a/src/EnergyPlus/CMakeLists.txt b/src/EnergyPlus/CMakeLists.txt
index ce2fcaa3531..fad3b470fd9 100644
--- a/src/EnergyPlus/CMakeLists.txt
+++ b/src/EnergyPlus/CMakeLists.txt
@@ -800,6 +800,9 @@ target_link_libraries(
 
 target_link_libraries(energypluslib PRIVATE project_options project_fp_options project_warnings)
 ep_enable_pch(energypluslib)
+if(LINK_WITH_PYTHON)
+  set_source_files_properties(PluginManager.cc PythonEngine.cc PROPERTIES SKIP_PRECOMPILE_HEADERS ON)
+endif()
 
 if(OPENGL_FOUND)
   target_link_libraries(energypluslib PUBLIC penumbra)
diff --git a/src/EnergyPlus/PluginManager.cc b/src/EnergyPlus/PluginManager.cc
index 9681ffdfdce..30f15bced78 100644
--- a/src/EnergyPlus/PluginManager.cc
+++ b/src/EnergyPlus/PluginManager.cc
@@ -45,20 +45,7 @@
 // OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 // POSSIBILITY OF SUCH DAMAGE.
 
-#include <EnergyPlus/Data/EnergyPlusData.hh>
-#include <EnergyPlus/DataGlobalConstants.hh>
-#include <EnergyPlus/DataStringGlobals.hh>
-#include <EnergyPlus/FileSystem.hh>
-#include <EnergyPlus/InputProcessing/InputProcessor.hh>
-#include <EnergyPlus/OutputProcessor.hh>
-#include <EnergyPlus/PluginManager.hh>
-#include <EnergyPlus/UtilityRoutines.hh>
-
-#include <algorithm>
-#include <nlohmann/json.hpp>
-
 #if LINK_WITH_PYTHON
-
 #    ifdef _DEBUG
 // We don't want to try to import a debug build of Python here
 // so if we are building a Debug build of the C++ code, we need
@@ -70,7 +57,21 @@
 #    else
 #        include <Python.h>
 #    endif
+#endif
 
+#include <EnergyPlus/Data/EnergyPlusData.hh>
+#include <EnergyPlus/DataGlobalConstants.hh>
+#include <EnergyPlus/DataStringGlobals.hh>
+#include <EnergyPlus/FileSystem.hh>
+#include <EnergyPlus/InputProcessing/InputProcessor.hh>
+#include <EnergyPlus/OutputProcessor.hh>
+#include <EnergyPlus/PluginManager.hh>
+#include <EnergyPlus/UtilityRoutines.hh>
+
+#include <algorithm>
+#include <nlohmann/json.hpp>
+
+#if LINK_WITH_PYTHON
 #    include <fmt/format.h>
 template <> struct fmt::formatter<PyStatus>
 {
diff --git a/src/EnergyPlus/PythonEngine.cc b/src/EnergyPlus/PythonEngine.cc
index 9d2f50d4423..8f14d3db70b 100644
--- a/src/EnergyPlus/PythonEngine.cc
+++ b/src/EnergyPlus/PythonEngine.cc
@@ -45,11 +45,6 @@
 // OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 // POSSIBILITY OF SUCH DAMAGE.
 
-#include <EnergyPlus/DataStringGlobals.hh>
-#include <EnergyPlus/PluginManager.hh>
-#include <EnergyPlus/PythonEngine.hh>
-#include <EnergyPlus/UtilityRoutines.hh>
-
 #if LINK_WITH_PYTHON
 #    ifdef _DEBUG
 // We don't want to try to import a debug build of Python here
@@ -62,7 +57,14 @@
 #    else
 #        include <Python.h>
 #    endif
+#endif
 
+#include <EnergyPlus/DataStringGlobals.hh>
+#include <EnergyPlus/PluginManager.hh>
+#include <EnergyPlus/PythonEngine.hh>
+#include <EnergyPlus/UtilityRoutines.hh>
+
+#if LINK_WITH_PYTHON
 #    include <fmt/format.h>
 namespace fmt {
 template <> struct formatter<PyStatus>
diff --git a/third_party/CMakeLists.txt b/third_party/CMakeLists.txt
index 8b11c5ecf59..4157c3c40ca 100644
--- a/third_party/CMakeLists.txt
+++ b/third_party/CMakeLists.txt
@@ -86,6 +86,9 @@ set(CMAKE_CXX_STANDARD 20)
 
 if(NOT MSVC)
   add_compile_options(-Wno-pedantic -Wno-unused-parameter -Wno-unknown-pragmas)
+  if(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 15.0)
+    add_compile_options($<$<COMPILE_LANGUAGE:CXX>:-Wno-dangling-reference> $<$<COMPILE_LANGUAGE:CXX>:-Wno-restrict>)
+  endif()
 else()
   add_compile_options(/wd4267 /wd4996 /wd4068 /wd4244 /wd4589)
 endif()
diff --git a/third_party/ObjexxFCL/src/ObjexxFCL/AlignedAllocator.hh b/third_party/ObjexxFCL/src/ObjexxFCL/AlignedAllocator.hh
index d15400f1375..b994b6fbe9d 100644
--- a/third_party/ObjexxFCL/src/ObjexxFCL/AlignedAllocator.hh
+++ b/third_party/ObjexxFCL/src/ObjexxFCL/AlignedAllocator.hh
@@ -20,6 +20,8 @@
 #include <cassert>
 #include <cstddef>
 #include <cstdint>
+#include <limits>
+#include <new>
 
 namespace ObjexxFCL {
 
@@ -38,16 +40,29 @@ public: // Types
 
 public: // Static Methods
 
-	// Allocate Raw Array Memory with ::operator new
+	// Raw allocation size including optional alignment padding
 	static
-	void *
-	allocate( size_type const n )
+	size_type
+	allocation_size( size_type const n )
 	{
 #ifdef OBJEXXFCL_ALIGN
-		void * mem( n > 0u ? ::operator new( ( n * sizeof( T ) ) + ( OBJEXXFCL_ALIGN - 1 ) ) : nullptr );
+		constexpr size_type alignment_overhead( OBJEXXFCL_ALIGN > 0u ? OBJEXXFCL_ALIGN - 1u : 0u );
 #else
-		void * mem( n > 0u ? ::operator new( n * sizeof( T ) ) : nullptr );
+		constexpr size_type alignment_overhead( 0u );
 #endif
+		constexpr size_type max_size( static_cast< size_type >( std::numeric_limits< std::ptrdiff_t >::max() ) );
+		if ( n > ( max_size - alignment_overhead ) / sizeof( T ) ) {
+			throw std::bad_array_new_length();
+		}
+		return ( n * sizeof( T ) ) + alignment_overhead;
+	}
+
+	// Allocate Raw Array Memory with ::operator new
+	static
+	void *
+	allocate( size_type const n )
+	{
+		void * mem( n > 0u ? ::operator new( allocation_size( n ) ) : nullptr );
 		assert( ( n == 0u ) || ( mem != nullptr ) );
 		return mem;
 	}
@@ -57,11 +72,7 @@ public: // Static Methods
 	void *
 	allocate_zero( size_type const n )
 	{
-#ifdef OBJEXXFCL_ALIGN
-		void * mem( ::operator new( ( n * sizeof( T ) ) + ( OBJEXXFCL_ALIGN - 1 ) ) );
-#else
-		void * mem( ::operator new( n * sizeof( T ) ) );
-#endif
+		void * mem( ::operator new( allocation_size( n ) ) );
 		assert( ( n == 0u ) || ( mem != nullptr ) );
 		return mem;
 	}
diff --git a/third_party/ssc/shared/lib_battery_dispatch.cpp b/third_party/ssc/shared/lib_battery_dispatch.cpp
index 6b3acbf7d9a..3a0b5a50c06 100644
--- a/third_party/ssc/shared/lib_battery_dispatch.cpp
+++ b/third_party/ssc/shared/lib_battery_dispatch.cpp
@@ -26,6 +26,7 @@ OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include <math.h>
 #include <algorithm>
+#include <cstdint>
 
 /*
 Dispatch base class
diff --git a/tst/EnergyPlus/unit/FluidProperties.unit.cc b/tst/EnergyPlus/unit/FluidProperties.unit.cc
index 2a8c0adbc04..be45622aa1b 100644
--- a/tst/EnergyPlus/unit/FluidProperties.unit.cc
+++ b/tst/EnergyPlus/unit/FluidProperties.unit.cc
@@ -54,7 +54,7 @@
 #include <EnergyPlus/Data/EnergyPlusData.hh>
 #include <EnergyPlus/FluidProperties.hh>
 
-#include <ctgmath>
+#include <cmath>
 
 #include "Fixtures/EnergyPlusFixture.hh"