1 files changed, 179 insertions, 0 deletions
diff --git a/tests/run/existing_output_files.srctree b/tests/run/existing_output_files.srctree
new file mode 100644
index 000000000..5f6f03355
--- /dev/null
+++ b/tests/run/existing_output_files.srctree
@@ -0,0 +1,179 @@
+PYTHON test.py
+
+######## test.py ########
+
+from __future__ import print_function
+
+import os.path
+from Cython.Utils import is_cython_generated_file
+from Cython.Compiler.Errors import CompileError
+from Cython.Build.Dependencies import cythonize
+
+# Make sure the source files are newer than the .c files, so that cythonize() regenerates them.
+files = {}
+for source_file in sorted(os.listdir(os.getcwd())):
+    if 'module' in source_file and (source_file.endswith(".pyx") or source_file.endswith(".py")):
+        c_file = files[source_file] = os.path.splitext(source_file)[0] + ".c"
+        os.utime(source_file, None)
+        assert not os.path.exists(c_file) or os.path.getmtime(source_file) >= os.path.getmtime(c_file)
+
+for source_file, c_file in files.items():
+    print("Testing:", source_file, c_file)
+    assert is_cython_generated_file(c_file, allow_failed=True, if_not_found=True)
+
+    # cythonizing should (re)generate the file
+    cythonize(source_file, language_level=3)
+    assert is_cython_generated_file(c_file, if_not_found=False)
+    assert os.path.getmtime(source_file) <= os.path.getmtime(c_file)
+
+    # calling cythonize again should not rewrite the file
+    # (not asserting this here, but at least it shouldn't fail)
+    cythonize(source_file, language_level=3)
+    assert is_cython_generated_file(c_file, if_not_found=False)
+    assert os.path.getmtime(source_file) <= os.path.getmtime(c_file)
+
+
+# But overwriting an unknown file should fail, even when requested multiple times.
+for source_file in [
+        "refuse_to_overwrite.pyx",
+        "refuse_to_overwrite.py",
+        "compile_failure.pyx",
+        "refuse_to_overwrite_header.pyx",
+        "refuse_to_overwrite_api_header.pyx",
+]:
+    if 'api_header' in source_file:
+        target_file = os.path.splitext(source_file)[0] + "_api.h"
+    elif 'header' in source_file:
+        target_file = os.path.splitext(source_file)[0] + ".h"
+    else:
+        target_file = os.path.splitext(source_file)[0] + ".c"
+
+    for _ in range(3):
+        os.utime(source_file, None)
+        assert not is_cython_generated_file(target_file)
+        try:
+            print("Testing:", source_file)
+            cythonize(source_file, language_level=3)
+        except CompileError:
+            print("REFUSED to overwrite %s, OK" % target_file)
+            assert not is_cython_generated_file(target_file)
+        else:
+            assert False, "FAILURE: Existing output file was overwritten for source file %s" % source_file
+
+
+######## pymodule.c ########
+#error Do not use this file, it is the result of a failed Cython compilation.
+
+######## pymodule.py ########
+"""
+Overwriting a failed .py file result works
+"""
+
+######## cymodule.c ########
+#error Do not use this file, it is the result of a failed Cython compilation.
+
+######## cymodule.pyx ########
+"""
+Overwriting a failed .pyx file result works
+"""
+
+######## overwritten_cymodule.c ########
+/* Generated by Cython 0.8.15 */
+
+######## overwritten_cymodule.pyx ########
+"""
+Overwriting an outdated .c file works
+"""
+
+
+######## new_cymodule.pyx ########
+"""
+Creating a new .c file works
+"""
+
+######## new_pymodule.py ########
+"""
+Creating a new .c file works
+"""
+
+
+######## refuse_to_overwrite.c ########
+static int external_function(int x) {
+    return x + 1;
+}
+
+######## refuse_to_overwrite.py ########
+"""
+Do not overwrite an unknown output file
+"""
+
+######## refuse_to_overwrite.pyx ########
+"""
+Do not overwrite an unknown output file
+"""
+
+
+######## compile_failure.c ########
+static int external_function(int x) {
+    return x + 1;
+}
+
+######## compile_failure.pyx ########
+"""
+Do not overwrite an unknown output file even on compile failures.
+"""
+
+Not Python syntax!
+
+
+
+######## write_module_header.pyx ########
+
+cdef public int func():
+    return 1
+
+
+######## overwrite_module_header.c ########
+/* Generated by Cython 0.8.15 */
+
+######## overwrite_module_header.pyx ########
+
+cdef public int func():
+    return 1
+
+
+######## refuse_to_overwrite_header.h ########
+static int external_function(int x) {
+    return x + 1;
+}
+
+######## refuse_to_overwrite_header.pyx ########
+
+cdef public int func():
+    return 1
+
+
+######## write_module_api_header.pyx ########
+
+cdef api int func():
+    return 1
+
+
+######## overwrite_module_api_header.c ########
+/* Generated by Cython 0.8.15 */
+
+######## overwrite_module_api_header.pyx ########
+
+cdef public int func():
+    return 1
+
+
+######## refuse_to_overwrite_api_header_api.h ########
+static int external_function(int x) {
+    return x + 1;
+}
+
+######## refuse_to_overwrite_api_header.pyx ########
+
+cdef api int func():
+    return 1