digitalmars.D.learn - Problems linking libdl?

simendsjo (45/45) Feb 20 2012 I've tried the following using dmd 58 and trunk - both -m64 on kubuntu.

simendsjo (2/47) Feb 20 2012 I get the same error using gdc-4.6

Mike Wey (5/28) Feb 20 2012 The problem is that -ldl should appear after -lphobos2 in the arguments

simendsjo (4/32) Feb 20 2012 Ok, that removed the error (although I got another).

Mike Wey (8/42) Feb 21 2012 The last time this problem came up in the newsgroup, with librt, it was

simendsjo <simendsjo gmail.com> writes:

I've tried the following using dmd 58 and trunk - both -m64 on kubuntu.
Any idea what I'm doing wrong?

import std.loader;
void main(string[] args)
{
     auto res = ExeModule_Init();
     assert(res == 0);
     scope(exit) ExeModule_Uninit();
     auto mod = ExeModule_Load("./libtcod.so");
}

$ dmd-trunk -v -L-ldl so.d

gcc so.o -o so -m64 -ldl -Xlinker  
-L/home/simendsjo/code/dmd-trunk/build/lib64 -Xlinker  
-L/home/simendsjo/code/dmd-trunk/build/lib -Xlinker  
--no-warn-search-mismatch -Xlinker --export-dynamic -lphobos2 -lpthread  
-lm -lrt
/home/simendsjo/code/dmd-trunk/build/lib64/libphobos2.a(loader_ad5_5c6.o):  
In function `_D3std6loader15ExeModule_Load_FxAyaZPv':
std/loader.d:(.text._D3std6loader15ExeModule_Load_FxAyaZPv+0x69):  
undefined reference to `dlopen'
/home/simendsjo/code/dmd-trunk/build/lib64/libphobos2.a(loader_ad2_567.o):  
In function `_D3std6loader13record_error_FZv':
std/loader.d:(.text._D3std6loader13record_error_FZv+0x7): undefined  
reference to `dlerror'
/home/simendsjo/code/dmd-trunk/build/lib64/libphobos2.a(loader_ad7_707.o):  
In function `_D3std6loader18ExeModule_Release_FKPvZv':
std/loader.d:(.text._D3std6loader18ExeModule_Release_FKPvZv+0x31):  
undefined reference to `dlclose'
/home/simendsjo/code/dmd-trunk/build/lib64/libphobos2.a(loader_ad8_7dc.o):  
In function `_D3std6loader20ExeModule_GetSymbol_FKPvxAyaZPv':
std/loader.d:(.text._D3std6loader20ExeModule_GetSymbol_FKPvxAyaZPv+0x2a):  
undefined reference to `dlsym'
collect2: ld returned 1 exit status
--- errorlevel 1


$ locate libdl
(...)
/lib/x86_64-linux-gnu/libdl-2.13.so
/lib/x86_64-linux-gnu/libdl.so.2
/lib32/libdl-2.13.so
/lib32/libdl.so.2
/usr/lib/x86_64-linux-gnu/libdl.a
/usr/lib/x86_64-linux-gnu/libdl.so
/usr/lib32/libdl.a
/usr/lib32/libdl.so
(...)

Feb 20 2012

simendsjo <simendsjo gmail.com> writes:

On Mon, 20 Feb 2012 21:41:45 +0100, simendsjo <simendsjo gmail.com> wrote:

 I've tried the following using dmd 58 and trunk - both -m64 on kubuntu.
 Any idea what I'm doing wrong?

 import std.loader;
 void main(string[] args)
 {
      auto res = ExeModule_Init();
      assert(res == 0);
      scope(exit) ExeModule_Uninit();
      auto mod = ExeModule_Load("./libtcod.so");
 }

 $ dmd-trunk -v -L-ldl so.d

 gcc so.o -o so -m64 -ldl -Xlinker  
 -L/home/simendsjo/code/dmd-trunk/build/lib64 -Xlinker  
 -L/home/simendsjo/code/dmd-trunk/build/lib -Xlinker  
 --no-warn-search-mismatch -Xlinker --export-dynamic -lphobos2 -lpthread  
 -lm -lrt
 /home/simendsjo/code/dmd-trunk/build/lib64/libphobos2.a(loader_ad5_5c6.o):  
 In function `_D3std6loader15ExeModule_Load_FxAyaZPv':
 std/loader.d:(.text._D3std6loader15ExeModule_Load_FxAyaZPv+0x69):  
 undefined reference to `dlopen'
 /home/simendsjo/code/dmd-trunk/build/lib64/libphobos2.a(loader_ad2_567.o):  
 In function `_D3std6loader13record_error_FZv':
 std/loader.d:(.text._D3std6loader13record_error_FZv+0x7): undefined  
 reference to `dlerror'
 /home/simendsjo/code/dmd-trunk/build/lib64/libphobos2.a(loader_ad7_707.o):  
 In function `_D3std6loader18ExeModule_Release_FKPvZv':
 std/loader.d:(.text._D3std6loader18ExeModule_Release_FKPvZv+0x31):  
 undefined reference to `dlclose'
 /home/simendsjo/code/dmd-trunk/build/lib64/libphobos2.a(loader_ad8_7dc.o):  
 In function `_D3std6loader20ExeModule_GetSymbol_FKPvxAyaZPv':
 std/loader.d:(.text._D3std6loader20ExeModule_GetSymbol_FKPvxAyaZPv+0x2a):  
 undefined reference to `dlsym'
 collect2: ld returned 1 exit status
 --- errorlevel 1


 $ locate libdl
 (...)
 /lib/x86_64-linux-gnu/libdl-2.13.so
 /lib/x86_64-linux-gnu/libdl.so.2
 /lib32/libdl-2.13.so
 /lib32/libdl.so.2
 /usr/lib/x86_64-linux-gnu/libdl.a
 /usr/lib/x86_64-linux-gnu/libdl.so
 /usr/lib32/libdl.a
 /usr/lib32/libdl.so
 (...)

I get the same error using gdc-4.6

Feb 20 2012

Mike Wey <mike-wey example.com> writes:

On 02/20/2012 09:49 PM, simendsjo wrote:
 On Mon, 20 Feb 2012 21:41:45 +0100, simendsjo <simendsjo gmail.com> wrote:

 I've tried the following using dmd 58 and trunk - both -m64 on kubuntu.
 Any idea what I'm doing wrong?

 import std.loader;
 void main(string[] args)
 {
 auto res = ExeModule_Init();
 assert(res == 0);
 scope(exit) ExeModule_Uninit();
 auto mod = ExeModule_Load("./libtcod.so");
 }

 $ dmd-trunk -v -L-ldl so.d

 gcc so.o -o so -m64 -ldl -Xlinker
 -L/home/simendsjo/code/dmd-trunk/build/lib64 -Xlinker
 -L/home/simendsjo/code/dmd-trunk/build/lib -Xlinker
 --no-warn-search-mismatch -Xlinker --export-dynamic -lphobos2
 -lpthread -lm -lrt

....
 I get the same error using gdc-4.6

The problem is that -ldl should appear after -lphobos2 in the arguments 
passed to gcc.

-- 
Mike Wey

Feb 20 2012

simendsjo <simendsjo gmail.com> writes:

On Mon, 20 Feb 2012 22:26:58 +0100, Mike Wey <mike-wey example.com> wrote:

 On 02/20/2012 09:49 PM, simendsjo wrote:
 On Mon, 20 Feb 2012 21:41:45 +0100, simendsjo <simendsjo gmail.com>  
 wrote:

 I've tried the following using dmd 58 and trunk - both -m64 on kubuntu.
 Any idea what I'm doing wrong?

 import std.loader;
 void main(string[] args)
 {
 auto res = ExeModule_Init();
 assert(res == 0);
 scope(exit) ExeModule_Uninit();
 auto mod = ExeModule_Load("./libtcod.so");
 }

 $ dmd-trunk -v -L-ldl so.d

 gcc so.o -o so -m64 -ldl -Xlinker
 -L/home/simendsjo/code/dmd-trunk/build/lib64 -Xlinker
 -L/home/simendsjo/code/dmd-trunk/build/lib -Xlinker
 --no-warn-search-mismatch -Xlinker --export-dynamic -lphobos2
 -lpthread -lm -lrt

 ....
 I get the same error using gdc-4.6

 The problem is that -ldl should appear after -lphobos2 in the arguments  
 passed to gcc.

Ok, that removed the error (although I got another).
But how can I specify this when I run dmd or gdc? dmd and gdc adds -L  
options before phobos...

Feb 20 2012

Mike Wey <mike-wey example.com> writes:

On 02/20/2012 10:33 PM, simendsjo wrote:
 On Mon, 20 Feb 2012 22:26:58 +0100, Mike Wey <mike-wey example.com> wrote:

 On 02/20/2012 09:49 PM, simendsjo wrote:
 On Mon, 20 Feb 2012 21:41:45 +0100, simendsjo <simendsjo gmail.com>
 wrote:

 I've tried the following using dmd 58 and trunk - both -m64 on kubuntu.
 Any idea what I'm doing wrong?

 import std.loader;
 void main(string[] args)
 {
 auto res = ExeModule_Init();
 assert(res == 0);
 scope(exit) ExeModule_Uninit();
 auto mod = ExeModule_Load("./libtcod.so");
 }

 $ dmd-trunk -v -L-ldl so.d

 gcc so.o -o so -m64 -ldl -Xlinker
 -L/home/simendsjo/code/dmd-trunk/build/lib64 -Xlinker
 -L/home/simendsjo/code/dmd-trunk/build/lib -Xlinker
 --no-warn-search-mismatch -Xlinker --export-dynamic -lphobos2
 -lpthread -lm -lrt

 ....
 I get the same error using gdc-4.6

 The problem is that -ldl should appear after -lphobos2 in the
 arguments passed to gcc.

 Ok, that removed the error (although I got another).
 But how can I specify this when I run dmd or gdc? dmd and gdc adds -L
 options before phobos...

The last time this problem came up in the newsgroup, with librt, it was 
moved from the configuration file into the compiler, so now it's hardcoded.

You could try passing -L--start-group before -L-ldl it should cause ld 
to recursively search for the symbols.

Unfortunately i can't test this on my system.

-- 
Mike Wey

Feb 21 2012

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digitalmars.D.learn - Problems linking libdl?