fix: support multiple inclusion

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

Author: henryiii

src/f2py_cmake/cmake/UseF2Py.cmake

@@ -8,7 +8,7 @@ if(CMAKE_VERSION VERSION_LESS 3.17)
   message(FATAL_ERROR "CMake 3.17+ required")
 endif()
 
-include_guard(GLOBAL)
+include_guard(DIRECTORY)
 
 if(TARGET Python::NumPy)
   set(_Python Python)

tests/packages/f90dual/CMakeLists.txt

@@ -0,0 +1,9 @@
+cmake_minimum_required(VERSION 3.24)
+
+project(test
+  LANGUAGES Fortran C
+)
+
+list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
+
+add_subdirectory(src)

tests/packages/f90dual/src/CMakeLists.txt

@@ -0,0 +1,19 @@
+add_subdirectory(subrepo)
+
+set (CMAKE_FIND_FRAMEWORK LAST)
+find_package(
+  Python
+  COMPONENTS Interpreter Development.Module NumPy
+  REQUIRED)
+  
+include(UseF2Py)
+
+message(STATUS "Building test f2py module")
+
+f2py_object_library(test_object OBJECT)
+f2py_generate_module(test_ test_py.F90 OUTPUT_VARIABLE test_files)
+python_add_library(test_ MODULE "${test_files}" WITH_SOABI)
+target_link_libraries(test_ PRIVATE test_object)
+install(TARGETS test_ DESTINATION lib/Python)
+
+message(STATUS "Done building test f2py module")

tests/packages/f90dual/src/subrepo/CMakeLists.txt

@@ -0,0 +1,9 @@
+cmake_minimum_required(VERSION 3.24)
+
+project(test-subrepo
+  LANGUAGES Fortran C
+)
+
+list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
+
+add_subdirectory(src)

tests/packages/f90dual/src/subrepo/src/CMakeLists.txt

@@ -0,0 +1,18 @@
+set(CMAKE_FIND_FRAMEWORK LAST)
+
+find_package(
+  Python
+  COMPONENTS Interpreter Development.Module NumPy
+  REQUIRED)
+
+include(UseF2Py)
+
+message(STATUS "Building subrepo f2py module")
+
+f2py_object_library(subrepo_object OBJECT)
+f2py_generate_module(subrepo_ subrepo_py.F90 OUTPUT_VARIABLE subrepo_files)
+python_add_library(subrepo_ MODULE "${subrepo_files}" WITH_SOABI)
+target_link_libraries(subrepo_ PRIVATE subrepo_object)
+install(TARGETS subrepo_ DESTINATION lib/Python)
+
+message(STATUS "Done building subrepo f2py module")

tests/packages/f90dual/src/subrepo/src/subrepo_piy.F90

@@ -0,0 +1,3 @@
+subroutine bobo()
+   print *, "bobo"
+end subroutine bobo

tests/packages/f90dual/src/test_py.F90

@@ -0,0 +1,3 @@
+subroutine bobo()
+   print *, "bobo"
+end subroutine bobo

tests/test_package.py

@@ -1,12 +1,16 @@
 from __future__ import annotations
 
 import importlib.metadata
+import shutil
+import subprocess
 import zipfile
 from pathlib import Path
 
+import pytest
 from scikit_build_core.build import build_wheel
 
 import f2py_cmake as m
+import f2py_cmake.vendor
 
 DIR = Path(__file__).parent.resolve()
 
@@ -15,6 +19,7 @@ def test_version():
     assert importlib.metadata.version("f2py_cmake") == m.__version__
 
 
+@pytest.skipif(shutil.which("cmake") is None, reason="CMake not found")
 def test_f77(monkeypatch, tmp_path):
     monkeypatch.chdir(DIR / "packages/f77")
     build_dir = tmp_path / "build"
@@ -30,3 +35,21 @@ def test_f77(monkeypatch, tmp_path):
     build_files = {x.name for x in build_dir.iterdir()}
     assert "fibbymodule.c" in build_files
     assert "fibby-f2pywrappers.f" in build_files
+
+
+
+def test_f90(monkeypatch, tmp_path):
+    src_dir = tmp_path / "source"
+    build_dir = tmp_path / "build"
+    shutil.copytree(DIR / "packages/f90dual", src_dir)
+    monkeypatch.chdir(src_dir)
+
+    cmake_dir = src_dir / "cmake"
+    cmake_dir.mkdir()
+    f2py_cmake.vendor.vendorize(cmake_dir)
+
+    inner_cmake_dir = src_dir / "src/subrepo/cmake"
+    inner_cmake_dir.mkdir()
+    f2py_cmake.vendor.vendorize(inner_cmake_dir)
+
+    subprocess.run(["cmake", "-S", ".", "-B", str(build_dir)], check=True)