[Solved] Help with linking error
lazarus / 1-Linux

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VTwin · 2014-01-09 13:54

Hello,

I am trying to get working versions of several programs on Linux.
These programs work well on both Mac and Windows Lazarus
distributions. I am starting with Ubuntu 12.04 Desktop 64 bit, using
the Lazarus amd64 distribution:

fpc_2.6.2-0_amd64.deb
fpc-src_2.6.2-0_amd64.deb
lazarus_1.0.14-0_amd64.deb

running on Mac OS 10.6.8 in a Parallels 7 virtual machine. I am able
to compile and run the default Lazarus "hello" application, however
when I attempt to compile one of my programs, I get the following
errors:

Code: [Select]Note: DWARF debug information cannot be used with smart
linking on this target, switching to static linking
/usr/bin/ld: unrecognised emulation mode: acosx_version_min
Supported emulations: elf_x86_64 elf32_x86_64 elf_i386 i386linux
elf_l1om elf_k1om
PicTracker.lpr(26,1) Error: Error while linking
PicTracker.lpr(26,1) Fatal: There were 1 errors compiling module,
stopping

I am not sure what this means, or where to begin tracking down this
error. Any assistance would be greatly appreciated.

Cheers,
Frederick

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BigChimp · 2014-01-09 13:59

My guess: in project options you probably set widgetset etc to an OSX
widgetset like Cocoa or Carbon. Other options are target OS or
processor.
You can try adding a new build mode with gtk widgetset, or removing
the explicit widgetset (etc) selection and choosing default.

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VTwin · 2014-01-09 14:19

Thanks BigChimp,

In Compiler Options, if I click on the link "Select another LCL widget
set (macro LCLWidgetType)". There is no explicit LCLWidgetType set.
The Mac build uses the default Carbon, and Windows is also default.

I just tried setting LCLWidgetType to gtk, and get the same error
message. Also with gtk2.

Cheers,
Frederick

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BigChimp · 2014-01-09 15:13

Hmmm, no more spontaneous ideas. If the project is not confidential,
you could publish the project (project/publish project) to a new
directory so you only have source code files there, zip it up and add
it to a post.

Will be glad to have a look on Windows and perhaps a Linux VM for you.

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VTwin · 2014-01-09 16:12

Thanks BigChimp,

That is a very kind offer! The code is not open source, but not
especially confidential. I will try compiling a couple of the other
projects and see if that gives me any leads. The "acosx_version_min"
leads me to suspect a math library incompatibility, but that is just a
hunch.

I have working Mac and Windows versions, the Windows version I compile
using Parallels 7 and a XP virtual machine. No problems there.

I'll report back on any progress, hopefully today, and then may take
you up on your offer.

Many thanks!

Cheers,
Frederick

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VTwin · 2014-01-09 20:14

BigChimp,

I found my error after a bit of poking around. I had set the compiler
"Custom option" to include:

-k-macosx_version_min -k10.5
-XR/Developer/SDKs/MacOSX10.5.sdk/

and also had the conditional macro:

if TargetOS = 'darwin' then begin
  UsageCustomOptions += ' -k-macosx_version_min -k10.5';
  UsageCustomOptions += ' -XR/Developer/SDKs/MacOSX10.5.sdk/';
end;   

The Windows compiler ignored both, but the Linux compiler tried to
interpret the custom options, hence the mystery error:
acosx_version_min, which I misinterpreted as a math library link
problem. 

Deleting those two lines from the custom options solved the problem.
The program is compiling and running now, so I just need to tweak the
code a bit now.

Many thanks!

Cheers,
Frederick

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BigChimp · 2014-01-10 10:37

Well, I can understand why you were thanking maths

Glad you got it sorted out!

note:  (yes, Captain Obvious here)
Code: [Select]if TargetOS = 'darwin' then begin
  UsageCustomOptions += ' -k-macosx_version_min -k10.5';
  UsageCustomOptions += ' -XR/Developer/SDKs/MacOSX10.5.sdk/';
end;
should explicitly test for OSX so shouldn't be a factor. It's probably
the recommended way to make sure your project remains cross platform.