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digitalmars.D.bugs - [Issue 6822] New: New ubuntu linking rules prevent dmd from linking programs on Ubuntu 11.10

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=6822

           Summary: New ubuntu linking rules prevent dmd from linking
                    programs on Ubuntu 11.10
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Keywords: link-failure
          Severity: critical
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: schveiguy yahoo.com


--- Comment #0 from Steven Schveighoffer <schveiguy yahoo.com> 2011-10-17
05:42:28 PDT ---
I recently upgraded to Ubuntu 11.10, and dmd complains during link that
functions defined in -lrt are missing.

using dmd -v, I get:

gcc testbool.o -o testbool -m32 -Xlinker
-L/home/steves/dmd-2.054/linux/bin32/../lib32 -Xlinker
-L/home/steves/dmd-2.054/linux/bin32/../lib64 -Xlinker
--no-warn-search-mismatch -Xlinker --export-dynamic -lrt -lphobos2 -lpthread
-lm 

Note that -lrt comes before -lphobos2, where the functions are needed.

I'm not sure how the compiler worked on ubuntu 11.04 (the previous release),
but apparently there are stricter rules.

I don't know how to fix this, you want to be able to link libs before and after
phobos is specified on the command line, so we may need to either explicitly
name phobos2 in the dmd.conf, or have two sets of DFLAGS.

However, as of now, I cannot link anything without using -v and manually
running the link step, adding -lrt to the end.

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next sibling parent d-bugmail puremagic.com writes:
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Brad Roberts <braddr puremagic.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |braddr puremagic.com


--- Comment #1 from Brad Roberts <braddr puremagic.com> 2011-10-19 09:16:00 PDT
---
The right answer for this one probably is moving the -lrt part out of dmd.conf
and into core/time.d as pragma(lib, "rt"), conditional on linux.  I haven't
tried it though.

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--- Comment #2 from Steven Schveighoffer <schveiguy yahoo.com> 2011-10-19
09:31:13 PDT ---
That doesn't work.  pragma(lib) only works if you are compiling all files at
the same time.

This fails to compile:

void main() {}

I didn't import std.datetime at all, so the compiler would never know that it
had to link -lrt.

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--- Comment #3 from Steven Schveighoffer <schveiguy yahoo.com> 2011-10-19
09:31:54 PDT ---
(In reply to comment #2)

 I didn't import std.datetime at all


or rather core.time...

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Walter Bright <bugzilla digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |bugzilla digitalmars.com
         Resolution|                            |FIXED


--- Comment #4 from Walter Bright <bugzilla digitalmars.com> 2011-10-19
11:37:15 PDT ---
https://github.com/D-Programming-Language/dmd/commit/1ff6ad8509cbfa73ae5519fa40898c5b005ab6ca

You'll still need to remove -lrt from your dmd.conf

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--- Comment #5 from Steven Schveighoffer <schveiguy yahoo.com> 2011-10-19
11:47:11 PDT ---
works, thanks.  Note that it still works even if you leave -L-rt in dmd.conf,
even though it's not necessary to have it there.

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