• Harm (15/15) Oct 18 2014 I'm trying to create a shared D library. I use the code from
• David Nadlinger (11/14) Oct 18 2014 This use case should actually be covered by the druntime shared
• Harm (9/24) Oct 19 2014 The tests run fine without problems. Somehow when I want to use

"Harm" <a example.com> writes:

I'm trying to create a shared D library. I use the code from 
http://dlang.org/dll-linux.html#dso10 (the last 2 files, main.d 
and dll.d). I can successfully compile and run them with:

ldc2 -oflibdll.so dll.d -shared -defaultlib=phobos2-ldc
ldc2 main.d -L-ldl -defaultlib=phobos2-ldc,druntime-ldc -L-rpath=.

As soon as I add import std.stdio to dll.d, the program gives me 
a segfault after it prints libdll.so shared static ~this. gdb 
tells me the crash is in rt_finalize2(). The wiki page warns 
about the multiple instances of the D runtime will conflict with 
each other. Since I could delete my druntime from the lib 
directory and still compile my .so file without errors the .so 
file probably does not contain a version of the d runtime.

I've build ldc from the master branch in github using 
-DBUILD_SHARED_LIBS=on using Xubuntu 14.04. Am I missing some 
flags or is the shared library support not complete yet?

"David Nadlinger" <code klickverbot.at> writes:

On Saturday, 18 October 2014 at 19:24:23 UTC, Harm wrote:
 I've build ldc from the master branch in github using 
 -DBUILD_SHARED_LIBS=on using Xubuntu 14.04. Am I missing some 
 flags or is the shared library support not complete yet?

This use case should actually be covered by the druntime shared 
library tests: 
https://github.com/ldc-developers/druntime/tree/e383a9bbdcd05cc6c315554df25658d6487c7176/test/shared/src

Thus this aspect of runtime loading should generally work on 
Linux x86_64, unless of course there is some kind of build system 
regression causing the tests not to be run on Travis CI.

Maybe you could try experimenting with the druntime tests to see 
what might cause the issue? Use "ctest -R druntime-test-shared 
--verbose" to get the initial build command.

David

"Harm" <a example.com> writes:

On Saturday, 18 October 2014 at 22:36:07 UTC, David Nadlinger 
wrote:
 On Saturday, 18 October 2014 at 19:24:23 UTC, Harm wrote:
 I've build ldc from the master branch in github using 
 -DBUILD_SHARED_LIBS=on using Xubuntu 14.04. Am I missing some 
 flags or is the shared library support not complete yet?

 This use case should actually be covered by the druntime shared 
 library tests: 
 https://github.com/ldc-developers/druntime/tree/e383a9bbdcd05cc6c315554df25658d6487c7176/test/shared/src

 Thus this aspect of runtime loading should generally work on 
 Linux x86_64, unless of course there is some kind of build 
 system regression causing the tests not to be run on Travis CI.

 Maybe you could try experimenting with the druntime tests to 
 see what might cause the issue? Use "ctest -R 
 druntime-test-shared --verbose" to get the initial build 
 command.

 David

The tests run fine without problems. Somehow when I want to use 
libphobos2-ldc things start to crash. Just adding a 
-L/path/to/libphobos2-ldc.so to DFLAGS in the test makefile 
doesn't affect the test result. Using std.stdio does though 
(getting the segmentation fault again). I've been trying (kind of 
recklessly) trying several mutations to the wiki code and the 
tests without success.