Linux中的-emit-llvm [英] -emit-llvm in Linux

问题描述

我是LLVM的新手，并尝试在Linux上生成易于阅读的.ll文件.我安装了llvm-gcc，但正如我所见，它只能生成汇编代码(-S选项).有什么方法可以像llvm在线生成的内容一样编译器?

I am a newbie to LLVM and 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?

这就是我在Linux上使用-S -emit-llvm所得到的:

That's what I get with -S -emit-llvm on Linux:

    .file   "hello.c"

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

    .text
    .globl  main
    .align  16, 0x90
    .type   main,@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,@object
    .section    .rodata.str1.1,"aMS",@progbits,1
.L.str:
    .asciz   "hello world\n"
    .size   .L.str, 13

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

这就是我想要得到的:

; 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

在Windows上，我使用相同的命令llvm-gcc -S -emit-llvm hello.c成功获取了此文件.

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

推荐答案

在llvm-gcc的ubuntu包装中发生了令人震惊的破坏. llvm-gcc的版本是4.2.1，但是在这里看到的是4.5.请报告Ubuntu错误.

Something is horrible broken in ubuntu packaging of llvm-gcc. llvm-gcc's version is 4.2.1, but here we're seeing 4.5. Please report Ubuntu bug.

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