Merge branch 'swig_src_file_ext' into 'master'

UseSWIG: Add support for custom Swig source file extensions

Closes #18727

See merge request cmake/cmake!2764

5 files changed, 82 insertions, 0 deletions

diff --git a/Tests/UseSWIG/CMakeLists.txt b/Tests/UseSWIG/CMakeLists.txt
index f79cda6..434895e 100644
--- a/Tests/UseSWIG/CMakeLists.txt
+++ b/Tests/UseSWIG/CMakeLists.txt
@@ -111,3 +111,15 @@ add_test(NAME UseSWIG.ModuleName COMMAND
   --build-options ${build_options}
   --test-command ${CMAKE_CTEST_COMMAND} -V -C $<CONFIGURATION>
   )
+
+
+add_test(NAME UseSWIG.SwigSrcFileExtension COMMAND
+  ${CMAKE_CTEST_COMMAND} -C $<CONFIGURATION>
+  --build-and-test
+  "${CMake_SOURCE_DIR}/Tests/UseSWIG/SwigSrcFileExtension"
+  "${CMake_BINARY_DIR}/Tests/UseSWIG/SwigSrcFileExtension"
+  ${build_generator_args}
+  --build-project SwigSrcFileExtension
+  --build-options ${build_options}
+  --test-command ${CMAKE_CTEST_COMMAND} -V -C $<CONFIGURATION>
+  )
diff --git a/Tests/UseSWIG/SwigSrcFileExtension/CMakeLists.txt b/Tests/UseSWIG/SwigSrcFileExtension/CMakeLists.txt
new file mode 100644
index 0000000..7eb73d4
--- /dev/null
+++ b/Tests/UseSWIG/SwigSrcFileExtension/CMakeLists.txt
@@ -0,0 +1,28 @@
+cmake_minimum_required(VERSION 3.1...3.14)
+
+project(SwigSrcFileExtension C)
+
+include(CTest)
+find_package(SWIG REQUIRED)
+find_package(Python COMPONENTS Interpreter Development REQUIRED)
+
+include(${SWIG_USE_FILE})
+
+# Use the newer target name preference
+set(UseSWIG_TARGET_NAME_PREFERENCE "STANDARD")
+
+# Set the custom source file extension to both .i and .swg
+set(SWIG_SOURCE_FILE_EXTENSIONS ".i" ".swg")
+
+# Generate a Python module out of `.i`
+swig_add_library(my_add LANGUAGE python SOURCES my_add.i)
+target_link_libraries(my_add Python::Python)
+
+# Generate a Python module out of `.swg`
+swig_add_library(my_sub LANGUAGE python SOURCES my_sub.swg)
+target_link_libraries(my_sub Python::Python)
+
+# Add a test
+add_test(NAME SwigSrcFileExtension
+  COMMAND "${CMAKE_COMMAND}" -E env "PYTHONPATH=${CMAKE_CURRENT_BINARY_DIR}"
+  "${Python_EXECUTABLE}" "${CMAKE_CURRENT_SOURCE_DIR}/runme.py")
diff --git a/Tests/UseSWIG/SwigSrcFileExtension/my_add.i b/Tests/UseSWIG/SwigSrcFileExtension/my_add.i
new file mode 100644
index 0000000..d087ab5
--- /dev/null
+++ b/Tests/UseSWIG/SwigSrcFileExtension/my_add.i
@@ -0,0 +1,9 @@
+%module my_add
+
+%{
+int add(int a, int b) {
+    return a + b;
+}
+%}
+
+int add(int a, int b);
diff --git a/Tests/UseSWIG/SwigSrcFileExtension/my_sub.swg b/Tests/UseSWIG/SwigSrcFileExtension/my_sub.swg
new file mode 100644
index 0000000..df34b44
--- /dev/null
+++ b/Tests/UseSWIG/SwigSrcFileExtension/my_sub.swg
@@ -0,0 +1,9 @@
+%module my_sub
+
+%{
+int sub(int a, int b) {
+    return a - b;
+}
+%}
+
+int sub(int a, int b);
diff --git a/Tests/UseSWIG/SwigSrcFileExtension/runme.py b/Tests/UseSWIG/SwigSrcFileExtension/runme.py
new file mode 100755
index 0000000..290175b
--- /dev/null
+++ b/Tests/UseSWIG/SwigSrcFileExtension/runme.py
@@ -0,0 +1,24 @@
+#!/usr/bin/env python
+
+from __future__ import print_function
+import random
+
+import my_add
+import my_sub
+
+
+# These can be changed, but make sure not to overflow `int`
+a = random.randint(1, 1024)
+b = random.randint(1, 1024)
+
+if my_add.add(a, b) == a + b:
+    print ("Test 1 Passed for SWIG custom source file extension")
+else:
+    print ("Test 1 FAILED for SWIG custom source file extension")
+    exit(1)
+
+if my_sub.sub(a, b) == a - b:
+    print ("Test 2 Passed for SWIG custom source file extension")
+else:
+    print ("Test 2 FAILED for SWIG custom source file extension")
+    exit(1)