[LLVMdev] -emit-llvm on ubuntu is broken

stackunderflow
Tue, 22 Mar 2011 01:36:48 -0000

I try to generate a human readable .ll file on Linux. I installed llvm-gcc
but as I see it can generate only assembly code (-S option). Is there any
way to get something like what is generated by llvm online compiler?

That's what I get with llvm-gcc -S -emit-llvm hello.c on Ubuntu 10.10:

    .file   "hello.c"

    .ident  "GCC: (Ubuntu/Linaro 4.5.1-7ubuntu2) 4.5.1 LLVM: "

    .text
    .globl  main
    .align  16, 0x90
    .type   main, at function
main:
    pushl   %ebp
    movl    %esp, %ebp
    subl    $8, %esp
    movl    $.L.str, 4(%esp)
    movl    $1, (%esp)
    call    __printf_chk
    xorl    %eax, %eax
    addl    $8, %esp
    popl    %ebp
    ret
.Ltmp0:
    .size   main, .Ltmp0-main

    .type   .L.str, at object
    .section    .rodata.str1.1,"aMS", at progbits,1
.L.str:
    .asciz   "hello world\n"
    .size   .L.str, 13

    .section    .note.GNU-stack,"", at progbits

That's what I am trying to get:

; ModuleID = '/tmp/webcompile/_7829_0.bc'
target datalayout
"e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-linux-gnu"

@.str = private constant [12 x i8] c"hello world\00", align 1 ;
<[12 x i8]*>
[#uses=1]

define i32 @main() nounwind {
entry:
  %0 = tail call i32 @puts(i8* getelementptr inbounds ([12 x i8]* @.str, i64
0, i64 0)) nounwind ; <i32> [#uses=0]
  ret i32 0
}

declare i32 @puts(i8* nocapture) nounwind

On windows I successfully get this file with the same command: llvm-gcc -S
-emit-llvm hello.c.
llvm
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