llvm dev - Oct 2013 - [LLVMdev] Feature request for include llvm-mc in llvm.org/builds

I found that access llvm-mc from clang driver is impossible, and I
want to use llvm-mc to compile assembly files, how to do that?


H:\CI\bld\compilers\musl\src\math\i386>clang -c -v --target=i686-pc-mingw
sqrt.s

clang version 3.4 (trunk)
Target: i686-pc-mingw
Thread model: posix
Selected GCC installation:
 "gcc" -v -c -m32 -o sqrt.o -x assembler sqrt.s
clang.exe: error: unable to execute command: program not executable
clang.exe: error: assembler (via gcc) command failed with exit code 1 (use -v to
 see invocation)

2013/10/18 Jim Grosbach <grosbach at apple.com>:
>
> On Oct 17, 2013, at 10:22 AM, Rafael Espíndola <rafael.espindola at
gmail.com> wrote:
>
>>> Clang can be used like an assembler in the sense that if it's
fed a .s
>>> file, it will assemble it. (I noted that clang-cl doesn't do
this for
>>> .asm files, I should fix that.)
>>>
>>> I'm not sure that we want to include llvm-mc in the installer.
Is it
>>> really intended to be used as an assembler by the end user? The
help
>>> text says "llvm machine code playground", which seems to
indicate it's
>>> more of an internal tool.
>>
>> I agree. Using the clang binary is the supported public interface for
>> using the integrated assembler.
>
> Yes. It’s not intended for end users at all.
>
>>
>> Cheers,
>> Rafael
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>


-- 
         此致
礼
罗勇刚
Yours
    sincerely,
Yonggang Luo

On 19 October 2013 06:01, 罗勇刚(Yonggang Luo) <luoyonggang at gmail.com>
wrote:
> I found that access llvm-mc from clang driver is impossible, and I
> want to use llvm-mc to compile assembly files, how to do that?
Try "clang -integrated-as -c test.s"

Cheers,
Rafael

2013/10/19 Rafael Espíndola <rafael.espindola at
gmail.com>:
> On 19 October 2013 06:01, 罗勇刚(Yonggang Luo) <luoyonggang at
gmail.com> wrote:
>> I found that access llvm-mc from clang driver is impossible, and I
>> want to use llvm-mc to compile assembly files, how to do that?
>
> Try "clang -integrated-as -c test.s"
Thank you very much, I use the following command compiled successfully:
clang  -integrated-as -c -v --target=i686-pc-mingw sqrt.s


The output format is file format ELF32-i386, i wanna to know
is there a way to output COFF format along with target=i686-pc-mingw.
because I want to compile to following asm file for both linux/gcc and
windows/visual C++.

.global sqrt
.type sqrt, at function
sqrt: fldl 4(%esp)
fsqrt
fstsw %ax
sub $12,%esp
fld %st(0)
fstpt (%esp)
mov (%esp),%ecx
and $0x7ff,%ecx
cmp $0x400,%ecx
jnz 1f
and $0x200,%eax
sub $0x100,%eax
sub %eax,(%esp)
fstp %st(0)
fldt (%esp)
1: add $12,%esp
fstpl 4(%esp)
fldl 4(%esp)
ret
>
> Cheers,
> Rafael


-- 
         此致
礼
罗勇刚
Yours
    sincerely,
Yonggang Luo