<div dir="ltr">Well sure, it's unlikely, but how many consumers can make that sort of guarantee? And if a consumer can't guarantee the integrity of the ELF file they have no choice but not to use LLD, or to fork before using it.</div><br><div class="gmail_quote"><div dir="ltr">On Mon, 21 Mar 2016 at 19:08 Rui Ueyama <<a href="mailto:ruiu@google.com">ruiu@google.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Mon, Mar 21, 2016 at 8:04 PM, James Molloy <span dir="ltr"><<a href="mailto:james@jamesmolloy.co.uk" target="_blank">james@jamesmolloy.co.uk</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">> <span style="color:rgb(51,51,51);font-family:'Helvetica Neue',Helvetica,'Segoe UI',Arial,freesans,sans-serif,'Apple Color Emoji','Segoe UI Emoji','Segoe UI Symbol';font-size:16px;line-height:25.6px">A corrupted file could cause a fatal error or SEGV.</span><div><span style="color:rgb(51,51,51);font-family:'Helvetica Neue',Helvetica,'Segoe UI',Arial,freesans,sans-serif,'Apple Color Emoji','Segoe UI Emoji','Segoe UI Symbol';font-size:16px;line-height:25.6px"><br></span></div><div><span style="color:rgb(51,51,51);font-family:'Helvetica Neue',Helvetica,'Segoe UI',Arial,freesans,sans-serif,'Apple Color Emoji','Segoe UI Emoji','Segoe UI Symbol';font-size:16px;line-height:25.6px">Uhhh, that's not particularly useful.</span></div></div></blockquote><div><br></div></div></div></div><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><div>"Corrupted" means really corrupted, like ELF header is broken. Is this really the case?</div></div></div></div><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><div><br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div><br><div class="gmail_quote"><div dir="ltr">On Mon, 21 Mar 2016 at 19:02 Rui Ueyama <<a href="mailto:ruiu@google.com" target="_blank">ruiu@google.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Sat, Mar 19, 2016 at 9:51 PM, James Molloy via llvm-dev <span dir="ltr"><<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr">Hi Lorenzo,<div><br></div><div>Clang doesn't call llc; LLVM is compiled into Clang. Clang does call the system linker though.</div><div><br></div><div>Making your compiler generate *object* code is very simple. Making it fixup that object code and execute it in memory (JIT style) is also simple. Linking it properly and creating a fixed up ELF file is less simple. For that, you need to compile to object (using addPassesToEmitFile() - see llc.cpp) then invoke a linker. Getting that command line right can be quite difficult.</div><div><br></div><div>Rafael, This would be a good usecase for LLD as a library. I heard that this is is an explicit non-goal, which really surprised me. Is that indeed the case?</div></div></blockquote><div><br></div></div></div></div><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><div>You can use LLD as a library.</div><div><a href="https://github.com/llvm-mirror/lld/blob/master/docs/NewLLD.rst#the-elf-linker-as-a-library" target="_blank">https://github.com/llvm-mirror/lld/blob/master/docs/NewLLD.rst#the-elf-linker-as-a-library</a></div></div></div></div><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div>Cheers,</div><div><br></div><div>James</div><div><div><br><div class="gmail_quote"><div dir="ltr">On Sat, 19 Mar 2016 at 13:32 Lorenzo Laneve via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="auto"><div><div><span style="background-color:rgba(255,255,255,0)">I'd like to make my compiler independent, just like Clang. Doesn't Clang call llc and then system's ld by itself? I don't want my compiler to depend by any other program.</span></div><div><span style="background-color:rgba(255,255,255,0)">I guess there will be a class in the llvm library that generates the object files based on the system's triple and data layout, and then call the system's ld?</span></div></div></div><div dir="auto"><div><br></div><div>On Mar 19, 2016, at 11:48 AM, Bruce Hoult <<a href="mailto:bruce@hoult.org" target="_blank">bruce@hoult.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr">If you've created a .bc or a .ll file then the simplest thing is to just give it to clang exactly the same as you would for a .c file. Clang will just Do The Right Thing with it.<div><br></div><div>If you don't want to link, then pass flags such as -c to clang as usual.<br><div><br></div><div>e.g.</div><div><br></div><div>---- hello.ll ----</div><div><div>declare i32 @puts(i8*)</div><div>@str = constant [12 x i8] c"Hello World\00"</div><div><br></div><div>define i32 @main() {</div><div> %1 = call i32 @puts(i8* getelementptr inbounds ([12 x i8]* @str, i64 0, i64 0))</div><div> ret i32 0</div><div>}</div></div><div>----------------</div><div><br></div><div>$ clang hello.ll -o hello && ./hello<br></div><div>warning: overriding the module target triple with x86_64-apple-macosx10.10.0</div><div>1 warning generated.</div><div>Hello World</div><div><br></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Mar 19, 2016 at 3:03 AM, Lorenzo Laneve via llvm-dev <span dir="ltr"><<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">I wrote my compiler and now it generates LLVM IR modules. Now i’d like to go ahead and make object file and then executable, just like clang does.<br>
<br>
What should I have to use to create the object files? and then how do I call the ld? (not llvm-ld, I want my compiler to work like Clang and I read that Clang doesn’t use llvm-ld).<br>
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