diff --git a/CMakeLists.txt b/CMakeLists.txt
index 722993e7edc..08f0c38524b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -538,12 +538,16 @@ endif()
 
 ###############################################################################
 # Compiler and system specific options
+set(CMAKE_POSITION_INDEPENDENT_CODE ON)
+set(CMAKE_CXX_VISIBILITY_PRESET hidden)
+set(CMAKE_VISIBILITY_INLINES_HIDDEN ON)
+
 if(UNIX)
 
-  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -fPIC -fno-strict-aliasing")
+  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -fno-strict-aliasing")
 
   # all warnings
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -fPIC -fno-strict-aliasing -Winvalid-pch -Wnon-virtual-dtor -Wno-narrowing")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -fno-strict-aliasing -Winvalid-pch -Wnon-virtual-dtor -Wno-narrowing")
   # TODO: temp for gcc-11 which throws narrowing conversions in Path_GTest.cpp due to int codepoints
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-narrowing")
   # Treat all warnings as errors
diff --git a/csharp/CSharpAPI.hpp b/csharp/CSharpAPI.hpp
index 87364956b9d..5651a34343b 100644
--- a/csharp/CSharpAPI.hpp
+++ b/csharp/CSharpAPI.hpp
@@ -12,6 +12,12 @@
 #  else
 #    define CSHARP_API __declspec(dllimport)
 #  endif
+#elif defined(__GNUC__) || defined(__clang__)
+#  ifdef openstudio_csharp_EXPORTS
+#    define CSHARP_API __attribute__((visibility("default")))
+#  else
+#    define CSHARP_API
+#  endif
 #else
 #  define CSHARP_API
 #endif
diff --git a/ruby/module/RubyAPI.hpp b/ruby/module/RubyAPI.hpp
index d486861179c..7bddc2e0208 100644
--- a/ruby/module/RubyAPI.hpp
+++ b/ruby/module/RubyAPI.hpp
@@ -14,6 +14,12 @@
 #  else
 #    define RUBY_API __declspec(dllimport)
 #  endif
+#elif defined(__GNUC__) || defined(__clang__)
+#  if defined(openstudio_rb_EXPORTS) || defined(openstudio_modeleditor_rb_EXPORTS)
+#    define RUBY_API __attribute__((visibility("default")))
+#  else
+#    define RUBY_API
+#  endif
 #else
 #  define RUBY_API
 #endif
diff --git a/src/airflow/AirflowAPI.hpp b/src/airflow/AirflowAPI.hpp
index 9498cf5fad0..77bc30aee0b 100644
--- a/src/airflow/AirflowAPI.hpp
+++ b/src/airflow/AirflowAPI.hpp
@@ -12,6 +12,12 @@
 #  else
 #    define AIRFLOW_API __declspec(dllimport)
 #  endif
+#elif defined(__GNUC__) || defined(__clang__)
+#  if defined(openstudio_airflow_EXPORTS) || defined(openstudio_EXPORTS)
+#    define AIRFLOW_API __attribute__((visibility("default")))
+#  else
+#    define AIRFLOW_API
+#  endif
 #else
 #  define AIRFLOW_API
 #endif
diff --git a/src/airflow/WindPressure.hpp b/src/airflow/WindPressure.hpp
index 30e871b240d..5222c591514 100644
--- a/src/airflow/WindPressure.hpp
+++ b/src/airflow/WindPressure.hpp
@@ -8,6 +8,12 @@
 
 #if _WIN32 || _MSC_VER
 #  define WIND_API __declspec(dllexport)
+#elif defined(__GNUC__) || defined(__clang__)
+#  if defined(openstudio_airflow_EXPORTS) || defined(openstudio_EXPORTS)
+#    define WIND_API __attribute__((visibility("default")))
+#  else
+#    define WIND_API
+#  endif
 #else
 #  define WIND_API
 #endif
diff --git a/src/alfalfa/AlfalfaAPI.hpp b/src/alfalfa/AlfalfaAPI.hpp
index 113e4218d90..c8a01499994 100644
--- a/src/alfalfa/AlfalfaAPI.hpp
+++ b/src/alfalfa/AlfalfaAPI.hpp
@@ -12,6 +12,12 @@
 #  else
 #    define ALFALFA_API __declspec(dllimport)
 #  endif
+#elif defined(__GNUC__) || defined(__clang__)
+#  if defined(openstudio_alfalfa_EXPORTS) || defined(openstudio_EXPORTS)
+#    define ALFALFA_API __attribute__((visibility("default")))
+#  else
+#    define ALFALFA_API
+#  endif
 #else
 #  define ALFALFA_API
 #endif
diff --git a/src/energyplus/EnergyPlusAPI.hpp b/src/energyplus/EnergyPlusAPI.hpp
index 98934332351..91f65bba5b1 100644
--- a/src/energyplus/EnergyPlusAPI.hpp
+++ b/src/energyplus/EnergyPlusAPI.hpp
@@ -12,6 +12,12 @@
 #  else
 #    define ENERGYPLUS_API __declspec(dllimport)
 #  endif
+#elif defined(__GNUC__) || defined(__clang__)
+#  if defined(openstudio_energyplus_EXPORTS) || defined(openstudio_EXPORTS)
+#    define ENERGYPLUS_API __attribute__((visibility("default")))
+#  else
+#    define ENERGYPLUS_API
+#  endif
 #else
 #  define ENERGYPLUS_API
 #endif
diff --git a/src/epjson/epJSONAPI.hpp b/src/epjson/epJSONAPI.hpp
index d0ea055e298..0abf5f6869a 100644
--- a/src/epjson/epJSONAPI.hpp
+++ b/src/epjson/epJSONAPI.hpp
@@ -12,6 +12,12 @@
 #  else
 #    define EPJSON_API __declspec(dllimport)
 #  endif
+#elif defined(__GNUC__) || defined(__clang__)
+#  if defined(openstudio_epjson_EXPORTS) || defined(openstudio_EXPORTS)
+#    define EPJSON_API __attribute__((visibility("default")))
+#  else
+#    define EPJSON_API
+#  endif
 #else
 #  define EPJSON_API
 #endif
diff --git a/src/gbxml/gbXMLAPI.hpp b/src/gbxml/gbXMLAPI.hpp
index 5161c0da265..915ccde54ba 100644
--- a/src/gbxml/gbXMLAPI.hpp
+++ b/src/gbxml/gbXMLAPI.hpp
@@ -12,6 +12,12 @@
 #  else
 #    define GBXML_API __declspec(dllimport)
 #  endif
+#elif defined(__GNUC__) || defined(__clang__)
+#  if defined(openstudio_gbxml_EXPORTS) || defined(openstudio_EXPORTS)
+#    define GBXML_API __attribute__((visibility("default")))
+#  else
+#    define GBXML_API
+#  endif
 #else
 #  define GBXML_API
 #endif
diff --git a/src/gltf/GltfAPI.hpp b/src/gltf/GltfAPI.hpp
index f28b6d282cb..1b4e8e285eb 100644
--- a/src/gltf/GltfAPI.hpp
+++ b/src/gltf/GltfAPI.hpp
@@ -12,6 +12,12 @@
 #  else
 #    define GLTF_API __declspec(dllimport)
 #  endif
+#elif defined(__GNUC__) || defined(__clang__)
+#  if defined(openstudio_gltf_EXPORTS) || defined(openstudio_EXPORTS)
+#    define GLTF_API __attribute__((visibility("default")))
+#  else
+#    define GLTF_API
+#  endif
 #else
 #  define GLTF_API
 #endif
diff --git a/src/isomodel/ISOModelAPI.hpp b/src/isomodel/ISOModelAPI.hpp
index ad5d99f0444..c9158f73f38 100644
--- a/src/isomodel/ISOModelAPI.hpp
+++ b/src/isomodel/ISOModelAPI.hpp
@@ -12,6 +12,12 @@
 #  else
 #    define ISOMODEL_API __declspec(dllimport)
 #  endif
+#elif defined(__GNUC__) || defined(__clang__)
+#  if defined(openstudio_isomodel_EXPORTS) || defined(openstudio_EXPORTS)
+#    define ISOMODEL_API __attribute__((visibility("default")))
+#  else
+#    define ISOMODEL_API
+#  endif
 #else
 #  define ISOMODEL_API
 #endif
diff --git a/src/measure/MeasureAPI.hpp b/src/measure/MeasureAPI.hpp
index 896a1af5d9b..6751c6895bc 100644
--- a/src/measure/MeasureAPI.hpp
+++ b/src/measure/MeasureAPI.hpp
@@ -12,6 +12,12 @@
 #  else
 #    define MEASURE_API __declspec(dllimport)
 #  endif
+#elif defined(__GNUC__) || defined(__clang__)
+#  if defined(openstudio_measure_EXPORTS) || defined(openstudio_EXPORTS)
+#    define MEASURE_API __attribute__((visibility("default")))
+#  else
+#    define MEASURE_API
+#  endif
 #else
 #  define MEASURE_API
 #endif
diff --git a/src/model/ModelAPI.hpp b/src/model/ModelAPI.hpp
index ad38c627781..75420a31905 100644
--- a/src/model/ModelAPI.hpp
+++ b/src/model/ModelAPI.hpp
@@ -12,6 +12,12 @@
 #  else
 #    define MODEL_API __declspec(dllimport)
 #  endif
+#elif defined(__GNUC__) || defined(__clang__)
+#  if defined(openstudio_model_EXPORTS) || defined(openstudio_EXPORTS)
+#    define MODEL_API __attribute__((visibility("default")))
+#  else
+#    define MODEL_API
+#  endif
 #else
 #  define MODEL_API
 #endif
diff --git a/src/modelica/ModelicaAPI.hpp b/src/modelica/ModelicaAPI.hpp
index 89ed70b31a5..6b656adcaa7 100644
--- a/src/modelica/ModelicaAPI.hpp
+++ b/src/modelica/ModelicaAPI.hpp
@@ -7,6 +7,12 @@
 #  else
 #    define MODELICA_API __declspec(dllimport)
 #  endif
+#elif defined(__GNUC__) || defined(__clang__)
+#  if defined(openstudio_modelica_EXPORTS) || defined(openstudio_EXPORTS)
+#    define MODELICA_API __attribute__((visibility("default")))
+#  else
+#    define MODELICA_API
+#  endif
 #else
 #  define MODELICA_API
 #endif
diff --git a/src/osversion/OSVersionAPI.hpp b/src/osversion/OSVersionAPI.hpp
index dbfa194b61f..d8f0b3c7e67 100644
--- a/src/osversion/OSVersionAPI.hpp
+++ b/src/osversion/OSVersionAPI.hpp
@@ -12,6 +12,12 @@
 #  else
 #    define OSVERSION_API __declspec(dllimport)
 #  endif
+#elif defined(__GNUC__) || defined(__clang__)
+#  if defined(openstudio_osversion_EXPORTS) || defined(openstudio_EXPORTS)
+#    define OSVERSION_API __attribute__((visibility("default")))
+#  else
+#    define OSVERSION_API
+#  endif
 #else
 #  define OSVERSION_API
 #endif
diff --git a/src/radiance/RadianceAPI.hpp b/src/radiance/RadianceAPI.hpp
index b4e4ec68259..3b9ca8adf61 100644
--- a/src/radiance/RadianceAPI.hpp
+++ b/src/radiance/RadianceAPI.hpp
@@ -12,6 +12,12 @@
 #  else
 #    define RADIANCE_API __declspec(dllimport)
 #  endif
+#elif defined(__GNUC__) || defined(__clang__)
+#  if defined(openstudio_radiance_EXPORTS) || defined(openstudio_EXPORTS)
+#    define RADIANCE_API __attribute__((visibility("default")))
+#  else
+#    define RADIANCE_API
+#  endif
 #else
 #  define RADIANCE_API
 #endif
diff --git a/src/sdd/SDDAPI.hpp b/src/sdd/SDDAPI.hpp
index 751e7cdb262..b3ed4d7e99f 100644
--- a/src/sdd/SDDAPI.hpp
+++ b/src/sdd/SDDAPI.hpp
@@ -12,6 +12,12 @@
 #  else
 #    define SDD_API __declspec(dllimport)
 #  endif
+#elif defined(__GNUC__) || defined(__clang__)
+#  if defined(openstudio_sdd_EXPORTS) || defined(openstudio_EXPORTS)
+#    define SDD_API __attribute__((visibility("default")))
+#  else
+#    define SDD_API
+#  endif
 #else
 #  define SDD_API
 #endif
diff --git a/src/utilities/UtilitiesAPI.hpp b/src/utilities/UtilitiesAPI.hpp
index 57d0c069b14..027f0930c55 100644
--- a/src/utilities/UtilitiesAPI.hpp
+++ b/src/utilities/UtilitiesAPI.hpp
@@ -29,6 +29,16 @@
 
 #  endif
 
+#elif defined(__GNUC__) || defined(__clang__)
+
+#  if defined(openstudio_utilities_EXPORTS) || defined(openstudio_EXPORTS)
+#    define UTILITIES_API __attribute__((visibility("default")))
+#    define UTILITIES_TEMPLATE_EXT
+#  else
+#    define UTILITIES_API
+#    define UTILITIES_TEMPLATE_EXT extern
+#  endif
+
 #else
 
 #  define UTILITIES_API