test installed pybind

.appveyor.yml

@@ -30,3 +30,4 @@ build_script:
 - cmake -A "%CMAKE_ARCH%" -DPYBIND11_WERROR=ON
 - set MSBuildLogger="C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll"
 - cmake --build . --config Release --target pytest -- /v:m /logger:%MSBuildLogger%
+- cmake --build . --config Release --target test_install -- /v:m /logger:%MSBuildLogger%

.travis.yml

@@ -110,5 +110,6 @@ script:
     -DPYBIND11_CPP_STANDARD=$CPP
     -DPYBIND11_WERROR=ON
 - $SCRIPT_RUN_PREFIX make pytest -j 2
+- $SCRIPT_RUN_PREFIX make test_install
 after_script:
 - if [ -n "$DOCKER" ]; then docker stop "$containerid"; docker rm "$containerid"; fi

tests/CMakeLists.txt

@@ -105,6 +105,54 @@ if(PYBIND11_TEST_OVERRIDE)
     COMMAND ${CMAKE_COMMAND} -E echo "Note: not all tests run: -DPYBIND11_TEST_OVERRIDE is in effect")
 endif()
 
+# test use of installation
+if(PYBIND11_INSTALL)
+  # 2.8.12 needed for test_installed_module
+  # 3.0 needed for interface library for test_installed_target
+  # 3.1 needed for cmake -E env for testing
+  if(NOT CMAKE_VERSION VERSION_LESS 3.1)
+    add_custom_target(test_installed_target
+      COMMAND ${CMAKE_COMMAND}
+              "-DCMAKE_INSTALL_PREFIX=${PROJECT_BINARY_DIR}/test_install"
+              -P "${PROJECT_BINARY_DIR}/cmake_install.cmake"
+      COMMAND ${CMAKE_CTEST_COMMAND}
+              --build-and-test "${CMAKE_CURRENT_SOURCE_DIR}/test_installed_target"
+                               "${CMAKE_CURRENT_BINARY_DIR}/test_installed_target"
+              --build-noclean
+              --build-generator ${CMAKE_GENERATOR}
+              $<$<BOOL:${CMAKE_GENERATOR_PLATFORM}>:--build-generator-platform> ${CMAKE_GENERATOR_PLATFORM}
+              --build-makeprogram ${CMAKE_MAKE_PROGRAM}
+              --build-target check
+              --build-options "-DCMAKE_PREFIX_PATH=${PROJECT_BINARY_DIR}/test_install"
+                              "-DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}"
+                              "-DPYTHON_EXECUTABLE=${PYTHON_EXECUTABLE}"
+                              "-DPYBIND11_CPP_STANDARD=${PYBIND11_CPP_STANDARD}"
+    )
+    add_custom_target(test_installed_module
+      COMMAND ${CMAKE_COMMAND}
+              "-DCMAKE_INSTALL_PREFIX=${PROJECT_BINARY_DIR}/test_install"
+              -P "${PROJECT_BINARY_DIR}/cmake_install.cmake"
+      COMMAND ${CMAKE_CTEST_COMMAND}
+              --build-and-test "${CMAKE_CURRENT_SOURCE_DIR}/test_installed_module"
+                               "${CMAKE_CURRENT_BINARY_DIR}/test_installed_module"
+              --build-noclean
+              --build-generator ${CMAKE_GENERATOR}
+              $<$<BOOL:${CMAKE_GENERATOR_PLATFORM}>:--build-generator-platform> ${CMAKE_GENERATOR_PLATFORM}
+              --build-makeprogram ${CMAKE_MAKE_PROGRAM}
+              --build-target check
+              --build-options "-DCMAKE_PREFIX_PATH=${PROJECT_BINARY_DIR}/test_install"
+                              "-DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}"
+                              "-DPYTHON_EXECUTABLE=${PYTHON_EXECUTABLE}"
+                              "-DPYBIND11_CPP_STANDARD=${PYBIND11_CPP_STANDARD}"
+    )
+  else()
+    add_custom_target(test_installed_target)
+    add_custom_target(test_installed_module)
+  endif()
+  add_custom_target(test_install)
+  add_dependencies(test_install test_installed_target test_installed_module)
+endif()
+
 # And another to show the .so size and, if a previous size, compare it:
 add_custom_command(TARGET pybind11_tests POST_BUILD
     COMMAND ${PYTHON_EXECUTABLE} ${CMAKE_SOURCE_DIR}/tools/libsize.py

tests/test_installed_module/CMakeLists.txt

@@ -0,0 +1,14 @@
+cmake_minimum_required(VERSION 2.8.12)
+project(test_installed_module CXX)
+
+set(CMAKE_MODULE_PATH "")
+
+find_package(pybind11 CONFIG REQUIRED)
+
+message(STATUS "Found pybind11: ${pybind11_INCLUDE_DIRS} (found version ${pybind11_VERSION})")
+message(STATUS "Found Python: ${PYTHON_INCLUDE_DIRS} (found version ${PYTHON_VERSION_STRING})")
+
+pybind11_add_module(test_installed_module SHARED main.cpp)
+
+add_custom_target(check ${CMAKE_COMMAND} -E env PYTHONPATH=$<TARGET_FILE_DIR:test_installed_module>
+                  ${PYTHON_EXECUTABLE} ${PROJECT_SOURCE_DIR}/test.py)

tests/test_installed_module/main.cpp

@@ -0,0 +1,10 @@
+#include <pybind11/pybind11.h>
+namespace py = pybind11;
+
+PYBIND11_PLUGIN(test_installed_module) {
+    py::module m("test_installed_module");
+
+    m.def("add", [](int i, int j) { return i + j; });
+
+    return m.ptr();
+}

tests/test_installed_module/test.py

@@ -0,0 +1,3 @@
+import test_installed_module
+assert test_installed_module.add(11, 22) == 33
+print('test_installed_module imports, runs, and adds: 11 + 22 = 33')

tests/test_installed_target/CMakeLists.txt

@@ -0,0 +1,20 @@
+cmake_minimum_required(VERSION 3.0)
+project(test_installed_target CXX)
+
+set(CMAKE_MODULE_PATH "")
+
+find_package(pybind11 CONFIG REQUIRED)
+
+message(STATUS "Found pybind11: ${pybind11_INCLUDE_DIRS} (found version ${pybind11_VERSION})")
+message(STATUS "Found Python: ${PYTHON_INCLUDE_DIRS} (found version ${PYTHON_VERSION_STRING})")
+
+add_library(test_installed_target MODULE main.cpp)
+
+target_link_libraries(test_installed_target PRIVATE pybind11::pybind11)
+
+# make sure result is, for example, test_installed_target.so, not libtest_installed_target.dylib
+set_target_properties(test_installed_target PROPERTIES PREFIX "${PYTHON_MODULE_PREFIX}"
+                                                       SUFFIX "${PYTHON_MODULE_EXTENSION}")
+
+add_custom_target(check ${CMAKE_COMMAND} -E env PYTHONPATH=$<TARGET_FILE_DIR:test_installed_target>
+                  ${PYTHON_EXECUTABLE} ${PROJECT_SOURCE_DIR}/test.py)

tests/test_installed_target/main.cpp

@@ -0,0 +1,10 @@
+#include <pybind11/pybind11.h>
+namespace py = pybind11;
+
+PYBIND11_PLUGIN(test_installed_target) {
+    py::module m("test_installed_target");
+
+    m.def("add", [](int i, int j) { return i + j; });
+
+    return m.ptr();
+}

tests/test_installed_target/test.py

@@ -0,0 +1,3 @@
+import test_installed_target
+assert test_installed_target.add(1, 2) == 3
+print('test_installed_target imports, runs, and adds: 1 + 2 = 3')