• TJB (17/17) May 14 2015 I have built a toy dynamic shared library on Mac OS X (in C), and
• John Colvin (2/19) May 15 2015 Off the top of my head: does adding -L-L$(pwd) help?
• TJB (6/7) May 15 2015 This is what I get:
• John Colvin (11/19) May 15 2015 should be
• Jacob Carlborg (4/7) May 16 2015 That should not be necessary.
• TJB (2/17) May 16 2015 This works perfectly. A big thanks!

"TJB" <broughtj gmail.com> writes:

I have built a toy dynamic shared library on Mac OS X (in C), and 
I have verified that it works from C. Now I would like to call it 
from D. So I have created the following interface file:

$ cat hello.di
extern (C):
     void printHelloWorld();

which I try to compile and run. But I get the following error:

$ dmd main.d -L-lhello
ld: library not found for -lhello
clang: error: linker command failed with exit code 1 (use -v to 
see invocation)
--- errorlevel 1

I gather that mac os x doesn't know where to find libhello.dylib 
(it is in the current directory). So how do I pass that 
information?

Thanks!
TJB

"John Colvin" <john.loughran.colvin gmail.com> writes:

On Friday, 15 May 2015 at 03:33:47 UTC, TJB wrote:
 I have built a toy dynamic shared library on Mac OS X (in C), 
 and I have verified that it works from C. Now I would like to 
 call it from D. So I have created the following interface file:

 $ cat hello.di
 extern (C):
     void printHelloWorld();

 which I try to compile and run. But I get the following error:

 $ dmd main.d -L-lhello
 ld: library not found for -lhello
 clang: error: linker command failed with exit code 1 (use -v to 
 see invocation)
 --- errorlevel 1

 I gather that mac os x doesn't know where to find 
 libhello.dylib (it is in the current directory). So how do I 
 pass that information?

 Thanks!
 TJB

Off the top of my head: does adding -L-L$(pwd) help?

"TJB" <broughtj gmail.com> writes:

 Off the top of my head: does adding -L-L$(pwd) help?

This is what I get:

$ dmd main.d -L-L$(pwd) -lhello
Error: unrecognized switch '-lhello'

Sorry if this is completely elementary and I am being quite dumb.

Thanks,
TJB

"John Colvin" <john.loughran.colvin gmail.com> writes:

On Friday, 15 May 2015 at 19:39:53 UTC, TJB wrote:
 Off the top of my head: does adding -L-L$(pwd) help?

 This is what I get:

 $ dmd main.d -L-L$(pwd) -lhello
 Error: unrecognized switch '-lhello'

 Sorry if this is completely elementary and I am being quite 
 dumb.

 Thanks,
 TJB

should be

$ dmd main.d -L-L$(pwd) -L-lhello

The -L means "send the following argument to the linker". Note 
that you may also find you need to help OS X find the dylib when 
running the program, either by moving it to one of the system 
locations or using DYLD_LIBRARY_PATH or 
DYLD_FALLBACK_LIBRARY_PATH (see 
http://stackoverflow.com/questions/3146274/is-it-ok-to-use-dyld-library-path-on-mac-os-x-and-whats-the
dynamic-library-s). 
However, I think the runtime linker looks in the present 
directory by default, so you might get away with it.

Jacob Carlborg <doob me.com> writes:

On 2015-05-15 21:49, John Colvin wrote:

 Note that you may also find you need to help OS X find the dylib when running
the
 program, either by moving it to one of the system locations or using
 DYLD_LIBRARY_PATH or DYLD_FALLBACK_LIBRARY_PATH

That should not be necessary.

-- 
/Jacob Carlborg

"TJB" <broughtj gmail.com> writes:

On Friday, 15 May 2015 at 19:49:30 UTC, John Colvin wrote:
 On Friday, 15 May 2015 at 19:39:53 UTC, TJB wrote:
 Off the top of my head: does adding -L-L$(pwd) help?

 This is what I get:

 $ dmd main.d -L-L$(pwd) -lhello
 Error: unrecognized switch '-lhello'

 Sorry if this is completely elementary and I am being quite 
 dumb.

 Thanks,
 TJB

 should be

 $ dmd main.d -L-L$(pwd) -L-lhello

This works perfectly. A big thanks!