llvm dev - Sep 2020 - Cross-compiling only compiler-rt libraries

Greetings everyone,

I am currently cross-compiling some of my programs to aarch64 with Clang. I
added my own sanitizer and library to the compiler-rt and want to use it.
However, since my machine is x86, the libraries are compiled for x86 use. I
was able to cross-compile to get the aarch64 libraries. However, this also
cross-compiles clang and now I can't use it on my x86 machine. Is there a
way to cross-compile only compiler-rt and not Clang? I can't seem to find a
way to do this.

In short, I want to have aarch64 compiler-rt libraries and an x86 clang,
since I will be compiling my programs on an x86 machine. Hope I was able to
explain this well enough. Please let me know if I wasn't clear or if you
have any questions. Thank you very much!

Best regards,
Mohannad Ismail
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Hey,

You can do that by running cmake directly against the compiler-rt directory
instead of the llvm dir.

Hope this helps!

On Wed, Sep 30, 2020, 17:54 Mohannad Ismail via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> Greetings everyone,
>
> I am currently cross-compiling some of my programs to aarch64 with Clang.
> I added my own sanitizer and library to the compiler-rt and want to use it.
> However, since my machine is x86, the libraries are compiled for x86 use. I
> was able to cross-compile to get the aarch64 libraries. However, this also
> cross-compiles clang and now I can't use it on my x86 machine. Is there
a
> way to cross-compile only compiler-rt and not Clang? I can't seem to
find a
> way to do this.
>
> In short, I want to have aarch64 compiler-rt libraries and an x86 clang,
> since I will be compiling my programs on an x86 machine. Hope I was able to
> explain this well enough. Please let me know if I wasn't clear or if
you
> have any questions. Thank you very much!
>
> Best regards,
> Mohannad Ismail
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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Hello Tobias,

Thank you for your reply. That is very helpful and I currently was able to
get that done. However, I was looking for a much cleaner solution in which
I can compile clang to be x86 and compiler-rt to be aarch64 both at the
same time in one compilation. Do you have any idea if that is possible?

Best regards,
Mohannad Ismail

On Wed, Sep 30, 2020 at 12:16 PM Tobias Hieta <tobias at plexapp.com>
wrote:
> Hey,
>
> You can do that by running cmake directly against the compiler-rt
> directory instead of the llvm dir.
>
> Hope this helps!
>
> On Wed, Sep 30, 2020, 17:54 Mohannad Ismail via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> Greetings everyone,
>>
>> I am currently cross-compiling some of my programs to aarch64 with
Clang.
>> I added my own sanitizer and library to the compiler-rt and want to use
it.
>> However, since my machine is x86, the libraries are compiled for x86
use. I
>> was able to cross-compile to get the aarch64 libraries. However, this
also
>> cross-compiles clang and now I can't use it on my x86 machine. Is
there a
>> way to cross-compile only compiler-rt and not Clang? I can't seem
to find a
>> way to do this.
>>
>> In short, I want to have aarch64 compiler-rt libraries and an x86
clang,
>> since I will be compiling my programs on an x86 machine. Hope I was
able to
>> explain this well enough. Please let me know if I wasn't clear or
if you
>> have any questions. Thank you very much!
>>
>> Best regards,
>> Mohannad Ismail
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>
>
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