http://d.puremagic.com/issues/show_bug.cgi?id=4080

           Summary: Patch for building dynamic libraries on Mac OS X
           Product: D
           Version: future
          Platform: x86
        OS/Version: Mac OS X
            Status: NEW
          Severity: normal
          Priority: P2
         Component: druntime
        AssignedTo: sean@invisibleduck.org
        ReportedBy: doob@me.com


--- Comment #0 from Jacob Carlborg <doob@me.com> 2010-04-11 05:48:49 PDT ---
Created an attachment (id=606)
Adds the "-dylib" flag

These three patches adds support for building dynamic libraries on Mac OS X.

The patch for DMD adds the "-dylib" flag to the compiler. Building with this flag enabled will produce a dynamic library.

The patch for druntime makes the necessary changes to build dynamic libraries. The D main function is now weakly linked, all of the module constructors of all the loaded images (executables, dynamic libraries) are run. The C main function is slightly modified to use the rt_init and rt_term functions. Two C functions are also added the will initialize and terminate the runtime if no D main function is available, i.e. a D plugin linked with a C application.

The patch for phobos is just some modifications to the make file.

To build druntime and phobos as dynamic libraries add "dynamic", i.e. "make -f osx.mak dynamic".

A note about dynamic libraries on Mac OS X:

Every dynamic library has an install name on Mac OS X which is the path to where an executable should look for the library when loading it. The build script sets this to "@rpath/<libname>.dylib", where <libname> is "libdruntime" or "libphobos2".

@rpath is a relative path which the user can set when compiling an executable like this: "dmd -L-rpath -L/path/to/library/". When the executable then is loaded it will search for the library in "/path/to/library/<libname>.dylib". -rpath can be set multiple times. The user can also change the install name with the tool "install_name_tool" without needing to recompile.

A change to the dmd.conf file is also needed. With this change the user doesn't have to set the @rpath every time when compiling. "libdruntime" must also be linked.

DFLAGS=-I%@P%/../src/phobos -I%@P%/../src/druntime/import -L-L%@P%/../lib -L-rpath -L%@P%/../lib -L%@P%/../lib/libdruntime.dylib

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--- Comment #1 from Jacob Carlborg <doob@me.com> 2010-04-11 05:49:32 PDT ---
Created an attachment (id=607)
Adds support for building dynamic libraries

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--- Comment #2 from Jacob Carlborg <doob@me.com> 2010-04-11 05:50:13 PDT ---
Created an attachment (id=608)
Adds support for building dynamic libraries

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--- Comment #3 from Jacob Carlborg <doob@me.com> 2010-04-11 05:52:34 PDT ---
BTW the make files probably needs some cleaning up, make files are not my strong side.

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Walter Bright <bugzilla@digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bugzilla@digitalmars.com


--- Comment #4 from Walter Bright <bugzilla@digitalmars.com> 2010-06-24 14:29:00 PDT ---
dmd portion: http://www.dsource.org/projects/dmd/changeset/559

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--- Comment #5 from Walter Bright <bugzilla@digitalmars.com> 2010-08-26 14:21:48 PDT ---
http://www.dsource.org/projects/dmd/changeset/372

I changed the location of the new files to be more consistent with druntime's existing conventions:

Adding         src\core\sys\osx\mach\dyld.d
Adding         src\core\sys\osx\mach\getsect.d
Adding         src\core\sys\osx\mach\loader.d
Adding         src\rt\dylib_fixes.c
Adding         src\rt\image.d

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