Commit 37a7541 breaks juliac on Linux

[romanrexc]

Commit 37a7541 in jl_autoinit_and_adopt_thread(): jl_pathname_for_handle() returns NULL if handle is the main executable on Linux. A possible fix is to fallback to '/proc/self/exe' in that case here or to do such a fix in jl_pathname_for_handle().

[romanrexc]

Ok, this helps me now

-        jl_init_with_image(NULL, image_path);
+        if (!image_path || !image_path[0])
+            julia_init(JL_IMAGE_IN_MEMORY);
+        else
+            jl_init_with_image(NULL, image_path);

[GunnarFarneback]

I believe this problem has been fixed. At least I can confirm that my use case broke after that commit, that the proposed workaround made it work, and that it is again working without workarounds on the latest master.

[giordano]

Do you have a reasonably small/self-contained reproducer which could be used as a regression test?

[gbaraldi]

The test was just implemented in a way that didn't catch this but #58197 makes so it would get caught