llvm dev - Mar 2016 - Need help with code generation

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.

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).

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.

If you don't want to link, then pass flags such as -c to clang as usual.

e.g.

---- hello.ll ----
declare i32 @puts(i8*)
@str = constant [12 x i8] c"Hello World\00"

define i32 @main() {
  %1 = call i32 @puts(i8* getelementptr inbounds ([12 x i8]* @str, i64 0,
i64 0))
  ret i32 0
}
----------------

$ clang hello.ll -o hello && ./hello
warning: overriding the module target triple with x86_64-apple-macosx10.10.0
1 warning generated.
Hello World


On Sat, Mar 19, 2016 at 3:03 AM, Lorenzo Laneve via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> 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.
>
> 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).
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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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.
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?
> On Mar 19, 2016, at 11:48 AM, Bruce Hoult <bruce at hoult.org> wrote:
> 
> 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.
> 
> If you don't want to link, then pass flags such as -c to clang as
usual.
> 
> e.g.
> 
> ---- hello.ll ----
> declare i32 @puts(i8*)
> @str = constant [12 x i8] c"Hello World\00"
> 
> define i32 @main() {
>   %1 = call i32 @puts(i8* getelementptr inbounds ([12 x i8]* @str, i64 0,
i64 0))
>   ret i32 0
> }
> ----------------
> 
> $ clang hello.ll -o hello && ./hello
> warning: overriding the module target triple with
x86_64-apple-macosx10.10.0
> 1 warning generated.
> Hello World
> 
> 
>> On Sat, Mar 19, 2016 at 3:03 AM, Lorenzo Laneve via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
>> 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.
>> 
>> 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).
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
> 
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