llvm dev - Jun 2015 - [LLVMdev] How to change the linker of clang

1) Build clang with GCC-4.9.2, when compling other application s with
clang/clang++, the default linker is ld, can I replace it with other linker
tool， if we can, how to do it?

I.E. can we use collect2 instead?

2) how to specify the  path, if we do not use the default vertion GCC?


Best Regards!
Eric Lew
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On Thu, Jun 11, 2015 at 8:31 PM, Eric Lu <eirc.lew at gmail.com> wrote:
> 1) Build clang with GCC-4.9.2, when compling other application s with
> clang/clang++, the default linker is ld, can I replace it with other linker
> tool， if we can, how to do it?
>
> I.E. can we use collect2 instead?
>
You could symlink ld to point to collect2.

For example I use gold and point to:
ls -la /usr/local/bin/ld:
/usr/local/bin/ld -> /usr/bin/gold

> 2) how to specify the  path, if we do not use the default vertion GCC?
>
You can specify which version of GCC when you run cmake by adding the flags:
-DCMAKE_C_COMPILER=<path> -DCMAKE_CXX_COMPILER=<path>

>
> Best Regards!
> Eric Lew
>
> _______________________________________________
> cfe-dev mailing list
> cfe-dev at cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
>
>
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That's what I used to do but each Ubuntu update would revert the symlink.
That's when I found about -fuse-ld=gold, I'd expect it to work with
other
linkers as well.

On Fri, Jun 12, 2015 at 11:52 AM, Nathan Wilson <nwilson20 at gmail.com>
wrote:
>
>
> On Thu, Jun 11, 2015 at 8:31 PM, Eric Lu <eirc.lew at gmail.com>
wrote:
>
>> 1) Build clang with GCC-4.9.2, when compling other application s with
>> clang/clang++, the default linker is ld, can I replace it with other
linker
>> tool， if we can, how to do it?
>>
>> I.E. can we use collect2 instead?
>>
> You could symlink ld to point to collect2.
>
> For example I use gold and point to:
> ls -la /usr/local/bin/ld:
> /usr/local/bin/ld -> /usr/bin/gold
>
>
>> 2) how to specify the  path, if we do not use the default vertion GCC?
>>
>
> You can specify which version of GCC when you run cmake by adding the
> flags:
> -DCMAKE_C_COMPILER=<path> -DCMAKE_CXX_COMPILER=<path>
>
>
>>
>> Best Regards!
>> Eric Lew
>>
>> _______________________________________________
>> cfe-dev mailing list
>> cfe-dev at cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
>>
>>
>
> _______________________________________________
> cfe-dev mailing list
> cfe-dev at cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
>
>
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The -B option tells clang where to look for the linker. So you could try:

clang -B /path/to/other/linker/ ...

Sandeep

On Thu, Jun 11, 2015 at 6:36 PM Eric Lu <eirc.lew at gmail.com> wrote:
> 1) Build clang with GCC-4.9.2, when compling other application s with
> clang/clang++, the default linker is ld, can I replace it with other linker
> tool， if we can, how to do it?
>
> I.E. can we use collect2 instead?
>
> 2) how to specify the  path, if we do not use the default vertion GCC?
>
>
> Best Regards!
> Eric Lew
>  _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
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For #1: Consider also the -B option to specify a path prefix to consult for
compiler-related sub-programs (e.g., GNU binutils) if the executables / symlinks
etc. have similar names.

Brian


On Jun 11, 2015, at 21:52, Nathan Wilson <nwilson20 at gmail.com> wrote:


> On Thu, Jun 11, 2015 at 8:31 PM, Eric Lu <eirc.lew at gmail.com>
wrote:
> 1) Build clang with GCC-4.9.2, when compling other application s with
clang/clang++, the default linker is ld, can I replace it with other linker
tool， if we can, how to do it?
> 
> I.E. can we use collect2 instead?
> 
You could symlink ld to point to collect2.

For example I use gold and point to:
ls -la /usr/local/bin/ld:
/usr/local/bin/ld -> /usr/bin/gold
 
> 2) how to specify the  path, if we do not use the default vertion GCC?
You can specify which version of GCC when you run cmake by adding the flags:
-DCMAKE_C_COMPILER=<path> -DCMAKE_CXX_COMPILER=<path>
> 
> 
> Best Regards!
> Eric Lew
> 
> 
> _______________________________________________
> cfe-dev mailing list
> cfe-dev at cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
_______________________________________________
LLVM Developers mailing list
LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
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On 11 Jun 2015, at 21:52, Nathan Wilson <nwilson20 at gmail.com>
wrote:
> On Thu, Jun 11, 2015 at 8:31 PM, Eric Lu <eirc.lew at gmail.com>
wrote:
> 1) Build clang with GCC-4.9.2, when compling other application s with
clang/clang++, the default linker is ld, can I replace it with other linker
tool， if we can, how to do it?
> 
> I.E. can we use collect2 instead?
> 
> You could symlink ld to point to collect2.
> 
> For example I use gold and point to:
> ls -la /usr/local/bin/ld:
> /usr/local/bin/ld -> /usr/bin/gold
>  
> 2) how to specify the  path, if we do not use the default vertion GCC?
> 
> 
> You can specify which version of GCC when you run cmake by adding the
flags:
> -DCMAKE_C_COMPILER=<path> -DCMAKE_CXX_COMPILER=<path>
Didn’t we upstream the support for -fuse-ld=foo, which would use ld.foo in your
default linker search path, so if you install gold as /usr/bin/ld.gold (as, I
believe, is the default), it will work with -fuse-ld=gold?

David