Fix static build and test on Linux.

src/CMakeLists.txt

@@ -216,6 +216,10 @@ set_target_properties(cellml PROPERTIES
   COMPATIBLE_INTERFACE_STRING ${PROJECT_VERSION_MAJOR}
 )
 
+if(NOT LIBCELLML_BUILD_SHARED AND CMAKE_SYSTEM_NAME STREQUAL "Linux")
+  set_target_properties(cellml PROPERTIES POSITION_INDEPENDENT_CODE 1)
+endif()
+
 set(DEBUG_SOURCE_FILES
   ${CMAKE_CURRENT_SOURCE_DIR}/debug.cpp
 )

src/bindings/CMakeLists.txt

@@ -17,6 +17,9 @@ if(LIBCELLML_BINDINGS_PYTHON) # Or any other bindings that use SWIG.
 endif()
 
 if(LIBCELLML_BINDINGS_PYTHON)
+  if(NOT LIBCELLML_BUILD_SHARED)
+    message(WARNING "The Python bindings are not intended to work with static libraries.")
+  endif()
   add_subdirectory(python)
 endif()
 

src/bindings/python/CMakeLists.txt

@@ -67,7 +67,7 @@ set_source_files_properties(${SWIG_INTERFACE_SRCS} PROPERTIES
 
 set(SETUP_PY_PACKAGE_FILES "'\${TARGET_FILE_NAME_cellml}'")
 list(APPEND FINALISE_PYTHON_BINDINGS_ARGUMENTS -DTARGET_FILE_NAME_cellml=$<TARGET_FILE_NAME:cellml>)
-if (UNIX AND NOT APPLE)
+if (UNIX AND NOT APPLE AND LIBCELLML_BUILD_SHARED)
   list(APPEND SETUP_PY_PACKAGE_FILES "'\${TARGET_SONAME_FILE_NAME_cellml}'")
   list(APPEND FINALISE_PYTHON_BINDINGS_ARGUMENTS -DTARGET_SONAME_FILE_NAME_cellml=$<TARGET_SONAME_FILE_NAME:cellml>)
   set(_GENERATOR_EXPRESSION_LIBCELLML_SONAME $<TARGET_SONAME_FILE:cellml>)

tests/gtest/cmake/internal_utils.cmake

@@ -134,6 +134,7 @@ function(cxx_library_with_type name type cxx_flags)
   add_library(${name} ${type} ${ARGN})
   set_target_properties(${name}
     PROPERTIES
+    POSITION_INDEPENDENT_CODE 1
     COMPILE_FLAGS "${cxx_flags}")
   if (BUILD_SHARED_LIBS OR type STREQUAL "SHARED")
     set_target_properties(${name}