[LLVMdev] GCC assembler rejects native code generated by LLVM

[Chris Lattner]

On Mon, 7 Mar 2005, Vyacheslav Akhmechet wrote:
> Ok, I just tried the patch with some modifications (added msvc target
> and used WIN32 instead of __MINGW32__ for preprocessor) and everything
> worked beautifully. Thanks for the help!

Did you actually try the previous patch?  If you compiled llvm-gcc with 
mingw, it should work, regardless of the compiler you use to compile 
the LLVM X86 backend with.

-Chris

> On Mon, 7 Mar 2005 20:45:40 -0500, Vyacheslav Akhmechet
> <coffeemug at gmail.com> wrote:
>> Reid,
>>
>> This patch won't work for me. I compile llvm toolset with MSVC Express
>> (hence __MINGW32__ won't be defined for me at compile time). I only
>> try to feed the generated assembly into gcc (pretty much gnu
>> assembler, I suppose). I don't use mingw tools at the earlier stage.
>> However it's obvious for me how to modify the code now (just add MSVC
>> at that line), thanks! I'll try it as soon as I can.
>>
>> Thanks,
>> - Vyacheslav.
>>
>>
>> On Mon, 07 Mar 2005 17:32:00 -0800, Reid Spencer <reid at x10sys.com> wrote:
>>> Vyacheslav,
>>>
>>> I've tracked down the change and I have a fix for you to test. The
>>> attached patch should be applied to the CVS head (version 1.132) of
>>> X86AsmPrinter.cpp in llvm/lib/Target/X86. The patch just includes MINGW
>>> targets in the same set of choices that it makes for Cygwin. Could you
>>> please try the patch and let me know if it solves your problem? If it
>>> does, I'll commit the patch.
>>>
>>> Thanks,
>>>
>>> Reid.
>>>
>>>
>>> On Mon, 2005-03-07 at 16:39, Vyacheslav Akhmechet wrote:
>>>> Ok, I got home so I have more details. Here's the sample C program:
>>>> ----------------- C program ---------------
>>>>    #include <stdio.h>
>>>>    int main() {
>>>>      printf("hello world\n");
>>>>      return 0;
>>>>    }
>>>> ------------- end C program -------------
>>>>
>>>> This is compiled using llvm online demo into the following llvm code
>>>> (target removed):
>>>> ----------------- LLVM code --------------
>>>> deplibs = [ "stdc++", "c", "crtend" ]
>>>> %.str_1 = internal constant [13 x sbyte] c"hello world\0A\00"; <[13 x
>>>> sbyte]*> [#uses=1]
>>>>
>>>> implementation   ; Functions:
>>>>
>>>> declare int %printf(sbyte*, ...)
>>>>
>>>> int %main() {
>>>> entry:
>>>> call void %__main( )
>>>> %tmp.0 = call int (sbyte*, ...)* %printf( sbyte* getelementptr ([13 x
>>>> sbyte]* %.str_1, int 0, int 0) ); <int> [#uses=0]
>>>> ret int 0
>>>> }
>>>>
>>>> declare void %__main()
>>>> ------------- End LLVM code -----------
>>>>
>>>> which in turn produces the following assembly code:
>>>>
>>>> ------------- Assembly code -------------
>>>>       .text
>>>>       .align  16
>>>>       .globl  main
>>>>       .type   main, @function
>>>> main:
>>>>       subl $12, %esp
>>>>       fnstcw 10(%esp)
>>>>       movb $2, 11(%esp)
>>>>       fldcw 10(%esp)
>>>>       call __main
>>>>       movl $l1__2E_str_1, %eax
>>>>       movl %eax, (%esp)
>>>>       call printf
>>>>       movl $0, %eax
>>>>       #IMPLICIT_USE
>>>>       addl $12, %esp
>>>>       ret
>>>>
>>>>
>>>>       .data
>>>>       .align  1
>>>>       .type l1__2E_str_1, at object
>>>>       .size l1__2E_str_1,13
>>>> l1__2E_str_1:                         # [13 x sbyte]* %.str_1 =  c"hello world\0A\00"
>>>>       .ascii  "hello world\n\000"
>>>> ---------- End assembly code ----------
>>>>
>>>> When I try to assemble the above code using
>>>> gcc hello.c.s -o hello.exe
>>>> I get the following errors:
>>>>
>>>> hello.c.s: Assembler messages:
>>>> hello.c.s:6: Warning: .type pseudo-op used outside of .def/.endef ignored.
>>>> hello.c.s:6: Error: junk at end of line, first unrecognized character is `m'
>>>> hello.c.s:24: Warning: .type pseudo-op used outside of .def/.endef ignored.
>>>> hello.c.s:24: Error: junk at end of line, first unrecognized character is `l'
>>>> hello.c.s:25: Warning: .size pseudo-op used outside of .def/.endef ignored.
>>>> hello.c.s:25: Error: junk at end of line, first unrecognized character is `l'
>>>>
>>>> Sorry for the long email. I attach all relevant files for clarity.
>>>>
>>>> ______________________________________________________________________
>>>> _______________________________________________
>>>> LLVM Developers mailing list
>>>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>>>> http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>
>>>
>>>
>>
>
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-Chris

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