gst-env.py: Output DYLD_LIBRARY_PATH with --only-environment on macOS

DYLD_LIBRARY_PATH is considered a security risk by Apple, so shells
filter it out, but we can set it when using --only-environment so
people can use it like so:

  eval $(./gst-env.py --only-environment)

This is currently the only way to build an app that links to gstreamer
inside the devenv on macOS and have it run properly.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3708>

1 files changed, 5 insertions, 1 deletions

diff --git a/gst-env.py b/gst-env.py
index fb266adad3..1eac43b9b9 100755
--- a/gst-env.py
+++ b/gst-env.py
@@ -294,8 +294,12 @@ def get_subprocess_env(options, gst_version):
     if os.name == 'nt':
         lib_path_envvar = 'PATH'
     elif platform.system() == 'Darwin':
-        # RPATH is sufficient on macOS, and DYLD_LIBRARY_PATH can cause issues with dynamic linker path priority
+        # DYLD_LIBRARY_PATH is stripped when new shells are spawned and can
+        # cause issues with runtime linker resolution, so only set it when
+        # using --only-environment
         lib_path_envvar = None
+        if options.only_environment:
+            lib_path_envvar = 'DYLD_LIBRARY_PATH'
     else:
         lib_path_envvar = 'LD_LIBRARY_PATH'