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digitalmars.D.bugs - [Issue 2776] New: pragma(lib, does not work when used in headers

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http://d.puremagic.com/issues/show_bug.cgi?id=2776

           Summary: pragma(lib, does not work when used in headers
           Product: D
           Version: 1.041
          Platform: PC
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla digitalmars.com
        ReportedBy: benoit tionex.de


I tried to use the pragma(lib, ...) feature without success.

I build a lib called "org.eclipse.swt.win32.win32.x86.lib", the source contain
several pragma declarations:

pragma(lib, "comctl32.lib"); // and more win32 libs
pragma(lib, "org.eclipse.swt.win32.win32.x86.lib"); // link to the lib itself

The module with those pragmas is always imported if the lib is used.

Now, when i compile a example using the lib and turn on verbose, dmd prints all
those lib lines
...
library   comctl32.lib
library   org.eclipse.swt.win32.win32.x86.lib
...

Later it prints the commands it passes to "link.exe", here the libs are
missing:
c:\Project\dwtinst\tango-0.99.8-bin-win32-dmd.1.041\bin\link.exe
"C:\Project\dwtinst\dwt-rcp\obj\SwtSnippet10","C:\Project\dwtinst\dwt-rcp\bin\SwtSnippet10.exe",,user32+kernel32/noi+C:\Project\dwtinst\dwt-rcp\lib\+tango-user-dmd.lib;

The result are all those symbols are missing.


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Apr 01 2009
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------- Comment #1 from benoit tionex.de  2009-04-01 08:23 -------
In DMD sources, the addition to the linker of the pragma(lib,..) happens in 
attrib.c: PragmaDeclaration::toObjFile
which like the name implies while object file generation. This is not happening
for headers. So I think the solution should be to move this to the semantic()
method.


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Apr 01 2009
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------- Comment #2 from larsivar igesund.net  2009-04-26 11:12 -------
Just found this myself. This feature is much more useful when used for
dependencies for libraries, than for building applications directly.

As long as the external library files are available, the application developer
would only have to worry about linking the library he is using, not also those
used by that library.


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Apr 26 2009
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--- Comment #3 from Jacob Carlborg <doob me.com>  2009-05-20 13:10:34 PDT ---
Created an attachment (id=377)
 --> (http://d.puremagic.com/issues/attachment.cgi?id=377)
This patch should fix the problem

The patch is for dmd v1.045 and tested with Mac OS X.

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May 20 2009
prev sibling next sibling parent d-bugmail puremagic.com writes:
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Andrej Mitrovic <andrej.mitrovich gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |andrej.mitrovich gmail.com


--- Comment #4 from Andrej Mitrovic <andrej.mitrovich gmail.com> 2011-04-10
11:25:31 PDT ---
This issue still exists. Is anyone able to update this patch for latest
versions of DMD (2.x included) and make a pull request on github?

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Apr 10 2011
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Walter Bright <bugzilla digitalmars.com> changed:

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


--- Comment #5 from Walter Bright <bugzilla digitalmars.com> 2011-04-10
16:35:35 PDT ---
There are a couple problems with this patch.

1. It moves up to the semantic phase a call to set the include lib in an obj
file. This is completely outside how obj files are written, and mucks up the
separation of passes. It shouldn't work at all.

2. Lots of projects have a tendency to import lots of things. Sometimes none of
it is referenced, sometimes only a minor declaration is referenced, sometimes
the import is an unneeded private import of some other module. Demanding then
that the referenced library exist and be linked in can cause its own
frustrations and problems.


I don't know if there is a good solution to these problems. I don't think the
patch is it.

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Jacob Carlborg <doob me.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |doob me.com


--- Comment #6 from Jacob Carlborg <doob me.com> 2011-04-11 00:27:47 PDT ---
DSSS/rebuild/bu(il)d adds its on pragma, pragma(link, ...), which basically
works like pragma(lib, ...) with this patch. Except when linking a library with
pragma(link) you only specify the name of the library and then it automatically
adds the extension depending on the platform. It also prefix the library name
with "lib" on Posix systems.

Could we add a pragma(link) that behaves as the one in DSSS/rebuild/bu(il)d,
this won't break any existing code, if I'm not missing something?

I would also like something for frameworks on Mac OS X, see:
http://d.puremagic.com/issues/show_bug.cgi?id=2968

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Apr 11 2011