python: Fixing builds as importable module

Signed-off-by: David Shah <davey1576@gmail.com>

CMakeLists.txt

@@ -83,6 +83,7 @@ foreach (family ${FAMILIES})
     add_executable(nextpnr-${family} ${COMMON_FILES} ${${ufamily}_FILES} ${GUI_SOURCE_FILES})
     # Add the importable Python module target
     PYTHON_ADD_MODULE(nextpnrpy_${family} ${COMMON_FILES} ${${ufamily}_FILES})
+    target_compile_definitions(nextpnrpy_${family} PRIVATE PYTHON_MODULE)
     # Add any new per-architecture targets here
 
     # Set ${family_targets} to the list of targets being build for this family

common/pybindings.cc

@@ -113,6 +113,7 @@ static wchar_t *program;
 
 void init_python(const char *executable)
 {
+#ifndef PYTHON_MODULE
     program = Py_DecodeLocale(executable, NULL);
     if (program == NULL) {
         fprintf(stderr, "Fatal error: cannot decode executable filename\n");
@@ -129,12 +130,15 @@ void init_python(const char *executable)
         std::string perror_str = parse_python_exception();
         std::cout << "Error in Python: " << perror_str << std::endl;
     }
+#endif
 }
 
 void deinit_python()
 {
+#ifndef PYTHON_MODULE
     Py_Finalize();
     PyMem_RawFree(program);
+#endif
 }
 
 void execute_python_file(const char *python_file)

dummy/main.cc

@@ -17,6 +17,8 @@
  *
  */
 
+#ifndef PYTHON_MODULE
+
 #include <QApplication>
 #include "design.h"
 #include "mainwindow.h"
@@ -31,3 +33,5 @@ int main(int argc, char *argv[])
 
     return a.exec();
 }
+
+#endif

ice40/main.cc

@@ -16,6 +16,9 @@
  *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  *
  */
+
+#ifndef PYTHON_MODULE
+
 #include <QApplication>
 #include <boost/program_options.hpp>
 #include <fstream>
@@ -263,3 +266,5 @@ int main(int argc, char *argv[])
     deinit_python();
     return rc;
 }
+
+#endif

python/python_mod_test.py

@@ -0,0 +1,7 @@
+# Run: PYTHONPATH=. python3 python/python_mod_test.py
+from nextpnrpy_ice40 import Chip, ChipArgs, iCE40Type
+args = ChipArgs()
+args.type = iCE40Type.HX1K
+chip = Chip(args)
+for wire in chip.getWires():
+    print(chip.getWireName(wire))