On 3/8/18 11:35 AM, Markus wrote:
error:
main.o: In function `_Dmain':
main.d:(.text._Dmain[_Dmain]+0xa): undefined reference to
`ns_a::some_function(ns_a::class_a*)'
collect2: error: ld returned 1 exit status
Error: linker exited with status 1
symbols:
nm --demangle libissue.so | some_function
000000000000059a T ns_a::some_function(ns_a::class_a*)
It doesn't seem like an error, but it is.
I still don't get it, whey I'm not allowed to split the namespace
declarations.
This is a linker error. Your D code is compiling just fine (in other
words, the aforementioned issue is not happening to you), it's just not
getting the definition from the dynamic library.
When I do this locally on my mac, I get a similar error. When I nm the
main.o file vs. the lib.o file, I see different mangled names.
It appears that the D mangled name is not doing back references. This is
probably why the change to another namespace for the function works
(there isn't a back reference)
In order to demonstrate this better, I did namespace thenamespace
instead of ns_a.
The symbol I see in the D file:
U __ZN12thenamespace13some_functionEPN12thenamespace7class_aE
And in the C++ file:
T __ZN12thenamespace13some_functionEPNS_7class_aE
Note the difference is instead of 12thenamespace, it's S_, which
probably is a back reference. Googled...
Yep, I'm right:
https://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangle.seq-id
I'd recommend filing a bug.
-Steve
