Introduce a helper to get the default shared library
suffix used on the host.

Suggested-by: Pierrick Bouvier <pierrick.bouv...@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <phi...@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouv...@linaro.org>
---
 tests/functional/qemu_test/__init__.py | 2 +-
 tests/functional/qemu_test/cmd.py      | 1 -
 tests/functional/qemu_test/config.py   | 6 ++++++
 3 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/tests/functional/qemu_test/__init__.py 
b/tests/functional/qemu_test/__init__.py
index 5c972843a6d..45f7befa374 100644
--- a/tests/functional/qemu_test/__init__.py
+++ b/tests/functional/qemu_test/__init__.py
@@ -7,7 +7,7 @@
 
 
 from .asset import Asset
-from .config import BUILD_DIR
+from .config import BUILD_DIR, dso_suffix
 from .cmd import is_readable_executable_file, \
     interrupt_interactive_console_until_pattern, wait_for_console_pattern, \
     exec_command, exec_command_and_wait_for_pattern, get_qemu_img, which
diff --git a/tests/functional/qemu_test/cmd.py 
b/tests/functional/qemu_test/cmd.py
index dc5f422b77d..254e23ef748 100644
--- a/tests/functional/qemu_test/cmd.py
+++ b/tests/functional/qemu_test/cmd.py
@@ -15,7 +15,6 @@
 import os
 import os.path
 
-
 def which(tool):
     """ looks up the full path for @tool, returns None if not found
         or if @tool does not have executable permissions.
diff --git a/tests/functional/qemu_test/config.py 
b/tests/functional/qemu_test/config.py
index edd75b7fd06..0eab1baa541 100644
--- a/tests/functional/qemu_test/config.py
+++ b/tests/functional/qemu_test/config.py
@@ -13,6 +13,7 @@
 
 import os
 from pathlib import Path
+import platform
 
 
 def _source_dir():
@@ -34,3 +35,8 @@ def _build_dir():
     raise Exception("Cannot identify build dir, set QEMU_BUILD_ROOT")
 
 BUILD_DIR = _build_dir()
+
+def dso_suffix():
+    '''Return the dynamic libraries suffix for the current platform'''
+    DSO_SUFFIXES = { 'Linux': 'so', 'Darwin': 'dylib', 'Windows': 'dll' }
+    return DSO_SUFFIXES[platform.system()]
-- 
2.47.1


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