Building LDC for the first time

[Kai Nacke via digitalmars-d-ldc]

Hi Daniel!

On Friday, 22 August 2014 at 02:24:10 UTC, Daniel N wrote:
> Dear All,
>
> I downloaded ldc-0.14.0-src.tar.gz and tried following the 
> instructions located at:
> http://wiki.dlang.org/Building_LDC_on_MinGW_x86

Thanks for trying LDC!

> I was only partially successful.
>
> $ uname
> MINGW32_NT-6.1
>
> My version:
> LDC - the LLVM D compiler (0.14.0):
>   based on DMD v2.065 and LLVM 3.5.0svn
>   Default target: i686-pc-windows-gnu
>
> Official version:
> LDC - the LLVM D compiler (0.14.0):
>   based on DMD v2.065 and LLVM 3.4.2
>   Default target: i686-pc-mingw32
>
> I realize I used too new LLVM, but nevertheless there's two 
> things puzzling me:

In general, LLVM 3.5 should work, too. But I did not check on 
MingW.

> 1) My targetTriple.getOS() == llvm::Triple::Win32 which results 
> in my compiler invoking the Visual Studio Linker, which isn't 
> necessarily a bad thing, but it was unexpected, because the 
> official build uses ld from MinGW.

If you look at the default target triple, you notice the change 
from mingw32 to windows-gnu. I think I missed to change the 
linker invocation, too. I'll check this.

> 2) The compiler builds fine, but the Druntime/Phobos doesn't.
> "ldc/import\core\stdc\math.d(672): Error: undefined identifier 
> isnan, did you mean function nan?" I guess that's a consequence 
> of my compiler having an identity crisis, using the wrong 
> version code-path...

I'll check this, too. Sounds like a bug.

> The combination of these two issues, is a problem since the 
> official build uses a different toolchain so I cannot use the 
> libs from it together with the MS linker, which means I'm stuck.
>
> I also tried using VS Express 2013:
> http://wiki.dlang.org/Building_and_hacking_LDC_on_Windows_using_MSVC
>
> But I can't get it to build either... my stdlib.h already 
> defines:
> long double strtold(const char *p,char **endp);
> (even if long double is just 8 bytes)
>
> But the workaround in \dmd2\root\longdouble.h redefines it as:
> longdouble strtold(const char *p,char **endp);
>
> I didn't find a clean way to solve it, every workaround 
> resulted in a new error down the road until I gave up and 
> switched to using MinGW...
>
> Any advice for me? (I can't switch OS right now).

I am still using VisualStudio 2012. But I try to fix this, too.

I'll give you a hint when I fixes the mingw problems. Then you 
can use master branch from GitHub instead of the source 
distribution.

Regards,
Kai